Mobile QR Code QR CODE : Journal of the Korean Society of Civil Engineers

  1. ๊ณ ๋ ค๋Œ€ํ•™๊ต ๊ฑด์ถ•์‚ฌํšŒํ™˜๊ฒฝ๊ณตํ•™๊ณผ (Korea University)


๋ชจ๋‹ˆํ„ฐ๋ง, ๋ถˆํ™•์‹ค์„ฑ, ๋ฒ ์ด์ง€์•ˆ ์—…๋ฐ์ดํŠธ, ์œ ์ง€๊ด€๋ฆฌ, ๋น„์šฉ ํšจ์œจ์„ฑ
Monitoring, Uncertainty, Bayesian update, Maintenance, Cost efficiency

  • 1. ์„œ ๋ก 

  • 2. ๋ฒ ์ด์ง€์•ˆ ๊ธฐ๋ฒ•์„ ์ด์šฉํ•œ ์ƒํƒœ์˜ˆ์ธก๋ชจ๋ธ ์—…๋ฐ์ดํŠธ

  • 2.1 ๊ต๋Ÿ‰ ๋ถ€์žฌ๋ณ„ ์ƒํƒœ์˜ˆ์ธก๋ชจ๋ธ

  • 2.2 ๋ชจ๋‹ˆํ„ฐ๋ง ๊ธฐ๋ฐ˜ ๋ฒ ์ด์ง€์•ˆ ์—…๋ฐ์ดํŠธ ์ ์šฉ

  • 3. ๋ชจ๋‹ˆํ„ฐ๋ง ๊ธฐ๋ฐ˜ ์œ ์ง€๊ด€๋ฆฌ๋น„์šฉ ๋ชจ๋ธ ์ œ์•ˆ

  • 3.1 ๋‹จ๊ณ„๋ณ„ ์œ ์ง€๊ด€๋ฆฌ๋น„์šฉ ๋ถ„์„ ๊ฐœ์š”

  • 3.2 ๋ชจ๋‹ˆํ„ฐ๋ง ๊ธฐ๋ฐ˜ ์šด์˜๋‹จ๊ณ„ ์œ ์ง€๊ด€๋ฆฌ ๋น„์šฉ๋ถ„์„ ๋ชจ๋ธ

  • 4. ๋ชจ๋‹ˆํ„ฐ๋ง ๊ธฐ๋ฐ˜ ์œ ์ง€๊ด€๋ฆฌ๋น„์šฉ ์‚ฐ์ • ์˜ˆ์‹œ

  • 4.1 ์œ ์ง€๊ด€๋ฆฌ๋น„์šฉ ์‚ฐ์ •์„ ์œ„ํ•œ ์ž…๋ ฅ๋ณ€์ˆ˜ ๋ฐ ๊ฐ€์ •์‚ฌํ•ญ

  • 4.2 ๋Œ€์ƒ ๊ต๋Ÿ‰ ๋ถ€์žฌ์˜ ์ ์šฉ๋œ ๋ณด์ˆ˜โ€ง๋ณด๊ฐ• ๊ณต๋ฒ•

  • 4.3 ์œ ์ง€๊ด€๋ฆฌ๋น„์šฉ ์‚ฐ์ •

  • 4. ๋ชจ๋‹ˆํ„ฐ๋ง ๊ธฐ๋ฐ˜ ์œ ์ง€๊ด€๋ฆฌ๋น„์šฉ ์‚ฐ์ • ์˜ˆ์‹œ

  • 5. ๊ฒฐ ๋ก 

1. ์„œ ๋ก 

๊ตญ๋‚ด ์‚ฌํšŒ๊ธฐ๋ฐ˜์‹œ์„ค์€ 1970๋…„๋Œ€ ๊ฒฝ์ œ์„ฑ์žฅ๊ณผ ํ•จ๊ป˜ ๊ทธ ๊ฐœ์ฒด์ˆ˜๋ฅผ ๊ธ‰๊ฒฉํžˆ ๋Š˜๋ ค์™”๋‹ค. ํŠนํžˆ, ์ตœ๊ทผ ๊ตญํ† ๊ตํ†ต๋ถ€์˜ 2016๋…„ ๋„๋กœ๊ต๋Ÿ‰ ๋ฐ ํ„ฐ๋„ ํ˜„ํ™ฉ์กฐ์„œ์— ๋”ฐ๋ฅด๋ฉด ์ „๊ตญ ๊ต๋Ÿ‰ ์ˆ˜๋Š” 2006๋…„ ๋ง๋ถ€ํ„ฐ 2016๋…„๊นŒ์ง€ ์ฆ๊ฐ€ํ•˜๋Š” ์ถ”์„ธ(Fig. 1)๋ฅผ ๋ณด์ด๋ฉฐ, 2016๋…„ 12์›” ๋ง ๊ธฐ์ค€ ์ „๊ตญ์˜ ๊ต๋Ÿ‰ ์ˆ˜๋Š” 32,325๊ฐœ์†Œ๋กœ์„œ 2006๋…„ ๋ง ๋Œ€๋น„ 8,520๊ฐœ์†Œ(+36%)๊ฐ€ ์ฆ๊ฐ€ํ•˜์˜€์œผ๋ฉฐ, ์—ฐ์žฅ์€ 1,105km (+52%)๊ฐ€ ์ฆ๊ฐ€ํ•˜์˜€๋‹ค. ์ด์ฒ˜๋Ÿผ ๊ตญ๋‚ด ๊ต๋Ÿ‰์‹œ์„ค๋ฌผ์ด ์ฆ๊ฐ€ํ•˜๋Š” ์ถ”์„ธ๋ฅผ ๋ณด์ด๊ณ , ๊ณต์šฉ์ˆ˜๋ช…์ด 30๋…„ ์ด์ƒ ๋˜๋Š” ๋…ธํ›„๊ต๋Ÿ‰์˜ ์ˆ˜ ๋˜ํ•œ ์ ์ฐจ ์ฆ๊ฐ€๋  ๊ฒƒ์œผ๋กœ ์˜ˆ์ƒ๋˜๋ฉฐ, ์ด์— ๋”ฐ๋ผ ์‚ฌํšŒ์ ์œผ๋กœ ์‹œ์„ค๋ฌผ ์œ ์ง€๊ด€๋ฆฌ์— ๋Œ€ํ•œ ๊ด€์‹ฌ์ด ๊ธ‰์ฆํ•˜์˜€๋‹ค. ์—ฌ๊ธฐ์„œ ๋…ธํ›„ ๊ต๋Ÿ‰์— ๋Œ€ํ•œ ๊ธฐ์ค€์€ ๏ฝข๋ฒ•์ธ์„ธ๋ฒ• ์‹œํ–‰๊ทœ์น™๏ฝฃ ์ œ15์กฐ(๋‚ด์šฉ์—ฐ์ˆ˜์™€ ์ƒ๊ฐ๋ฅ ) ์ œ3ํ•ญ ๊ด€๋ จ ๋ณ„ํ‘œ5์— ์ œ์‹œ๋œ โ€˜์ฒ ๊ทผ์ฝ˜ํฌ๋ฆฌํŠธโ€™๊ตฌ์กฐ๋ฌผ์˜ ๋ฒ•์ • ๋‚ด์šฉ์—ฐ์ˆ˜(์ตœ์†Œ 30๋…„, ์ตœ๋Œ€ 50๋…„) ํ•˜ํ•œ์น˜(30๋…„)๋ฅผ ์ ์šฉํ•œ ๊ฒƒ์ด๋‹ค.

Figure_KSCE_38_4_01_F1.jpg
Fig. 1.

Trend and Variation in Domestic Bridges

ํ•œํŽธ, ์ตœ๊ทผ ๊ตญ๋‚ด์™ธ ์—ฐ๊ตฌ๋™ํ–ฅ์„ ์‚ดํŽด๋ณด๋ฉด ์ธ๋ ฅ ๊ธฐ๋ฐ˜์˜ ์•ˆ์ „ ์ง„๋‹จ ๋ฐ ์œ ์ง€๊ด€๋ฆฌ ์ฒด๊ณ„๋ฅผ ๋ณด์™„ํ•˜๊ธฐ ์œ„ํ•ด ์„ผ์„œ ๋ฐ ๋“œ๋ก ์ด๋‚˜ ๋กœ๋ด‡ ๋“ฑ์˜ ๋ฌด์ธ ๊ฒ€์‚ฌ ์žฅ๋น„๋ฅผ ํ™œ์šฉํ•œ ์œ ์ง€๊ด€๋ฆฌ ์ฒด๊ณ„ ๊ตฌ์ถ•์— ๋Œ€ํ•œ ์ค‘์š”์„ฑ์ด ์‚ฌํšŒ์  ์ด์Šˆ๋กœ ๋Œ€๋‘๋˜๊ณ  ์žˆ๋‹ค(KAIA, 2016). ๋˜ํ•œ, ์ตœ๊ทผ ๊ตญ์™ธ ์„ ์ง„๊ตญ์„ ์ค‘์‹ฌ์œผ๋กœ ๊ต๋Ÿ‰์˜ ์ƒํƒœํ‰๊ฐ€, ๋ถ•๊ดด ์ทจ์•ฝ๋ถ€ ๋ชจ๋‹ˆํ„ฐ๋ง, ๋ณด์ˆ˜/๋ณด๊ฐ•๊ณต๋ฒ• ์ •๋Ÿ‰ํ™” ๋“ฑ ๊ต๋Ÿ‰ ์ƒ์• ์ฃผ๊ธฐ์— ๊ฑธ์นœ ๋ชจ๋‹ˆํ„ฐ๋ง ๊ธฐ์ˆ ์„ ํ†ตํ•ด ๊ต๋Ÿ‰์˜ ์œ ์ง€๊ด€๋ฆฌ ๋น„์šฉ ์ ˆ๊ฐ๊ณผ ํ•จ๊ป˜ ์žฅ์ˆ˜๋ช…ํ™”๋ฅผ ์œ„ํ•œ ์œ ์ง€๊ด€๋ฆฌ ์ „๋žต ์ˆ˜๋ฆฝ๊ณผ ๊ด€๋ จ๋œ ์—ฐ๊ตฌ๊ฐ€ ์ง„ํ–‰ ์ค‘์ด๋‹ค(KAIA, 2013). ์ด์ฒ˜๋Ÿผ ๊ต๋Ÿ‰์„ ํฌํ•จํ•œ ์‚ฌํšŒ๊ธฐ๋ฐ˜์‹œ์„ค์˜ ์œ ์ง€๊ด€๋ฆฌ์— ๋Œ€ํ•œ ๊ฐœ๋…์€ ํ˜„์žฌ ์‹œ์ ์„ ๊ธฐ๋ฐ˜์œผ๋กœ ๋ฏธ๋ž˜์˜ ์ƒํƒœ์„ฑ๋Šฅ ๋ฐ ๋น„์šฉ์„ ์˜ˆ์ธกํ•˜๋Š” ํ™•๋ฅ ์  ๋ถ„์„์— ๊ทผ๊ฑฐํ•˜๊ณ  ์žˆ๊ธฐ ๋•Œ๋ฌธ์— ๊ตฌ์กฐ๋ฌผ์˜ ์ƒ์• ์ฃผ๊ธฐ๋น„์šฉ, ๋ฏธ๋ž˜ ์ƒํƒœ์˜ˆ์ธก ๋“ฑ์— ๋Œ€ํ•œ ์‹ ๋ขฐ์„ฑ ์žˆ๋Š” ๋ถ„์„์ด ํ•„์š”ํ•˜๋‹ค(Jung et al., 2007; Frangopol et al., 2008; Cha et al., 2015; Kim and Jang, 2017).

์œ„์—์„œ ์–ธ๊ธ‰ํ•œ ๋ฐ”์™€ ๊ฐ™์ด ์‚ฌํšŒ๊ธฐ๋ฐ˜์‹œ์„ค๋ฌผ์˜ ์†์ƒ์œ ํ˜•์„ ๋ฐ”ํƒ•์œผ๋กœ ๊ตฌ์ถ•๋œ ์ ๊ฒ€ ์ง„๋‹จ ๋ฐ์ดํ„ฐ ๊ธฐ๋ฐ˜ ์ƒํƒœ์˜ˆ์ธก๋ชจ๋ธ ๊ฐœ๋ฐœ, ๊ตฌ์กฐ๋ฌผ ์ทจ์•ฝ๋ถ€์˜ ์„ผ์‹ฑ ๋ฐ ๋ชจ๋‹ˆํ„ฐ๋ง์„ ํ†ตํ•œ ๊ด‘์—ญ ๋ฐ ๊ตญ๋ถ€ ์†์ƒ ๊ฐ์ง€ ๋“ฑ์— ๋Œ€ํ•œ ์—ฐ๊ตฌ๋Š” ํ™œ๋ฐœํžˆ ์ง„ํ–‰๋˜๊ณ  ์žˆ์œผ๋‚˜ ๊ฐœ๋ฐœ๋œ ๋ชจ๋‹ˆํ„ฐ๋ง ๊ธฐ์ˆ ์— ๋”ฐ๋ฅธ ํ™•๋ฅ ์  ์ƒํƒœ์˜ˆ์ธก๋ชจ๋ธ ๊ธฐ๋ฐ˜ ์˜ˆ๋ฐฉ์  ์œ ์ง€๊ด€๋ฆฌ ์˜์‚ฌ๊ฒฐ์ • ์ˆ˜๋ฆฝ์— ๊ด€๋ จ๋œ ์—ฐ๊ตฌ๋Š” ์ƒ๋Œ€์ ์œผ๋กœ ๋ฏธ๋น„ํ•œ ์‹ค์ •์ด๋‹ค.

๊ธฐ์กด ์ธ๋ ฅ ๊ธฐ๋ฐ˜ ๋ฐ˜๋ณตโ€ง์ฃผ๊ธฐ์ ์ธ ์œ ์ง€๊ด€๋ฆฌ๊ฐ€ ์•„๋‹Œ ๋ณด๋‹ค ์‹ ๋ขฐ์„ฑ ์žˆ๋Š” ์ ๊ฒ€ ์žฅ๋น„๋ฅผ ํ†ตํ•œ ์Šค๋งˆํŠธ ๋ชจ๋‹ˆํ„ฐ๋ง ๊ธฐ์ˆ  ๊ธฐ๋ฐ˜ ๊ต๋Ÿ‰์˜ ์˜ˆ๋ฐฉ์  ์œ ์ง€๊ด€๋ฆฌ ์˜์‚ฌ๊ฒฐ์ • ์‹œ์Šคํ…œ ๊ตฌ์ถ•์„ ์œ„ํ•ด์„œ๋Š” ์œ ์ง€๊ด€๋ฆฌ์˜ ์‹ค์ œ ๋Œ€์ƒ์ด ๋˜๋Š” ๊ต๋Ÿ‰์˜ ์ฃผ์š” ์—ดํ™” ์š”์ธ์„ ์ •ํ™•ํžˆ ํŒŒ์•…ํ•˜๊ณ  ๋Œ€์ƒ ๊ต๋Ÿ‰ ๋ถ€์žฌ๋ณ„ ์—ดํ™”์— ์˜ํ•œ ์ƒํƒœ ์„ฑ๋Šฅ ๋ณ€ํ™”์— ๋”ฐ๋ฅธ ์ƒํƒœ์„ฑ๋Šฅ ๋ฐ ๋ถˆํ™•์‹ค์„ฑ ์˜ˆ์ธก์ด ๋ฐ˜๋“œ์‹œ ํ•„์š”ํ•˜๋‹ค. ๋งŒ์•ฝ ๊ต๋Ÿ‰์— ์•„๋ฌด๋Ÿฐ ์œ ์ง€๊ด€๋ฆฌ ์กฐ์น˜๊ฐ€ ์—†๋‹ค๋ฉด ๊ต๋Ÿ‰์˜ ์ƒ์• ์ฃผ๊ธฐ ๋™์•ˆ ์œก์•ˆ ์ ๊ฒ€์„ ํ†ตํ•ด ํŒ๋‹จ์ด ์–ด๋ ค์šด ๋ถ€์‹, ํ”ผ๋กœ๊ท ์—ด ๋“ฑ๊ณผ ๊ฐ™์€ ๋‹ค์–‘ํ•œ ์—ดํ™”์ธ์ž๋“ค์— ์˜ํ•ด ๋Œ€์ƒ ๊ต๋Ÿ‰์˜ ์ƒํƒœ๊ฐ€ ์ตœ์ดˆ ์˜ˆ์ธกํ•œ ๋ฐ”์™€ ์ผ์น˜ํ•˜์ง€ ์•Š์„ ํ™•๋ฅ ์ด ์ปค์ง„๋‹ค. ๋”ฐ๋ผ์„œ ๋ฐœ์ƒ ๊ฐ€๋Šฅํ•œ ์—ดํ™”์ธ์ž๋“ค์„ ์Šค๋งˆํŠธ ๋ชจ๋‹ˆํ„ฐ๋ง์„ ํ†ตํ•ด ์‚ฌ์ „์— ์ ๊ฒ€ํ•˜์—ฌ ๊ธฐ์กด ์ƒํƒœ์˜ˆ์ธก๋ชจ๋ธ์˜ ์‹ ๋ขฐ๋„๋ฅผ ๋†’์ด๊ณ , ์ด๋Ÿฌํ•œ ์—…๋ฐ์ดํŠธ ์ƒํƒœ์˜ˆ์ธก๋ชจ๋ธ์„ ๊ธฐ๋ฐ˜์œผ๋กœ ์œ ์ง€๊ด€๋ฆฌ ํ™œ๋™(๋ณด์ˆ˜โ€ง๋ณด๊ฐ• ๋ฐ ๊ต์ฒด)์„ ์‹ค์‹œํ–ˆ์„ ๋•Œ ๊ต๋Ÿ‰์˜ ์ƒํƒœ๋Š” ์œ ์ง€๊ด€๋ฆฌ ์ธก๋ฉด์—์„œ ๊ต๋Ÿ‰ ๊ด€๋ฆฌ์ž๊ฐ€ ๋ชฉํ‘œ๋กœ ํ•˜๋Š” ์ƒํƒœ์„ฑ๋Šฅ ์ง€์ˆ˜(์ƒํƒœ๋“ฑ๊ธ‰ ๋˜๋Š” ์ƒํƒœ์ ์ˆ˜)๋ฅผ ํ™•๋ณดํ•  ์ˆ˜ ์žˆ๋‹ค.

๋”ฐ๋ผ์„œ ๋ณธ ๋…ผ๋ฌธ์—์„œ๋Š” ๊ต๋Ÿ‰์˜ ๊ณต์šฉ ์ค‘ ๋ชจ๋‹ˆํ„ฐ๋ง ๊ธฐ๋ฐ˜ ์ƒํƒœ์˜ˆ์ธก๋ชจ๋ธ์˜ ํ™•๋ฅ  ํŠน์„ฑ์น˜(ํ‰๊ท  ๋ฐ ํ‘œ์ค€ํŽธ์ฐจ)๋ฅผ ๋ฒ ์ด์ง€์•ˆ ๊ธฐ๋ฒ•์— ๋”ฐ๋ผ ์—…๋ฐ์ดํŠธํ•˜์˜€๊ณ , ๋Œ€์ƒ ๊ต๋Ÿ‰์˜ ํŠน์ •์‹œ์ ์—์„œ ์ƒํƒœ์ ๊ฒ€์„ ์‹ค์‹œํ–ˆ์„ ๋•Œ, ํŒ์ •๋œ ๊ต๋Ÿ‰์˜ ํ™•๋ฅ ์  ์ƒํƒœ์˜ˆ์ธก๋ชจ๋ธ์ด ๊ต๋Ÿ‰ ๊ด€๋ฆฌ์ž๊ฐ€ ์›ํ•˜๋Š” ๊ด€๋ฆฌ(๋“ฑ๊ธ‰) ์ˆ˜์ค€์— ๋„๋‹ฌํ•œ ์‹œ์ ์—์„œ ๋ฐœ์ƒ ๊ฐ€๋Šฅํ•œ ๋ณด์ˆ˜โ€ค๋ณด๊ฐ•๊ณต๋ฒ• ์ ์šฉ ํ™•๋ฅ ์„ ์˜ˆ์ธกํ•˜์˜€๋‹ค. ์˜ˆ์ธก๋œ ๋ณด์ˆ˜โ€ค๋ณด๊ฐ•๊ณต๋ฒ• ์ ์šฉ ํ™•๋ฅ ์„ ๋Œ€์ƒ ๊ต๋Ÿ‰์˜ ๋“ฑ๊ธ‰๋ณ„ ๋ณด์ˆ˜โ€ง๋ณด๊ฐ• ๋น„์šฉ๋ชจ๋ธ๊ณผ ์—ฐ๊ณ„ํ•˜์—ฌ ์œ ์ง€๊ด€๋ฆฌ ๋น„์šฉ ๋ถ„์„ ๋ชจ๋ธ์„ ์ œ์‹œํ•˜๊ณ , ์˜ˆ์ธก๋œ ์—ดํ™”๋ชจ๋ธ์ด ์ƒ์• ์ฃผ๊ธฐ ๋น„์šฉ๋ถ„์„ ์ธก๋ฉด์—์„œ ์–ผ๋งˆ๋‚˜ ๊ฒฝ์ œ์ ์ธ ํšจ๊ณผ๋ฅผ ๊ฐ€์ ธ์˜ฌ ์ˆ˜ ์žˆ๋Š”์ง€๋ฅผ ํŒ๋‹จํ•˜์˜€๋‹ค.

2. ๋ฒ ์ด์ง€์•ˆ ๊ธฐ๋ฒ•์„ ์ด์šฉํ•œ ์ƒํƒœ์˜ˆ์ธก๋ชจ๋ธ ์—…๋ฐ์ดํŠธ

2.1 ๊ต๋Ÿ‰ ๋ถ€์žฌ๋ณ„ ์ƒํƒœ์˜ˆ์ธก๋ชจ๋ธ

๋ณธ ์ ˆ์—์„œ๋Š” ์ƒํƒœ์˜ˆ์ธก๋ชจ๋ธ์˜ ์˜ํ–ฅ์ธ์ž ๋ฐ ๊ฐœ๋ฐœ ์ ˆ์ฐจ์— ๋Œ€ํ•ด ์ˆ˜๋กํ•˜์˜€๋‹ค. ์ƒํƒœ๋“ฑ๊ธ‰์˜ ์ ๊ฒ€์ข…๋ฅ˜๋Š” ์ •๊ธฐ์ ๊ฒ€, ์ •๋ฐ€์ง„๋‹จ, ์ •๋ฐ€์•ˆ์ „์ง„๋‹จ, ๊ธด๊ธ‰์ ๊ฒ€์œผ๋กœ ํฌ๊ฒŒ ๋‚˜๋ˆ„์–ด์ง„๋‹ค. ๋ณธ ๋…ผ๋ฌธ์—์„œ ์ •๋ฐ€์ง„๋‹จ๊ณผ ์ •๋ฐ€์•ˆ์ „์ง„๋‹จ์˜ ์ƒํƒœ๋“ฑ๊ธ‰ ๋ฐ์ดํ„ฐ๊ฐ€ ๋‹ค๋ฅธ ์ข…๋ฅ˜์˜ ์ƒํƒœ๋“ฑ๊ธ‰ ๋ฐ์ดํ„ฐ๋ณด๋‹ค ์ ๊ฒ€์ ˆ์ฐจ๋ฅผ ๊ณ ๋ คํ•˜์˜€์„ ๋•Œ ์‹ ๋ขฐ๋„๊ฐ€ ๋†’๊ธฐ ๋•Œ๋ฌธ์— ์ด ์ƒํƒœ๋“ฑ๊ธ‰ ๋ฐ์ดํ„ฐ๋ฅผ ์ด์šฉํ•˜์˜€๋‹ค. ์ •๋ฐ€์•ˆ์ „์ง„๋‹จ์€ 1995๋…„๋ถ€ํ„ฐ ์‹œ์ž‘ํ•˜์˜€๊ธฐ ๋•Œ๋ฌธ์— ์ด์šฉ ๋ฐ์ดํ„ฐ์˜ ์ ๊ฒ€์ผ ๋ฒ”์œ„๋Š” 1995๋…„ ์ดํ›„์˜ ๊ฐ ๊ตญ๋„ ๊ต๋Ÿ‰์˜ ์ •๋ฐ€์ ๊ฒ€ ๋ฐ ์ •๋ฐ€์•ˆ์ „์ง„๋‹จ ๋ฐ์ดํ„ฐ๋ฅผ ์ˆ˜์ง‘(ํ•œ๊ตญ๊ฑด์„ค๊ธฐ์ˆ ์—ฐ๊ตฌ์› ๊ต๋Ÿ‰๊ด€๋ฆฌ์‹œ์Šคํ…œ(BMS)์— ์ˆ˜๋ก๋œ 1,2์ข… ๋ฐ ๊ธฐํƒ€ ๊ต๋Ÿ‰ ๋“ฑ๊ธ‰์ด๋ ฅ ๋ฐ์ดํ„ฐ ์ˆ˜์ง‘ ๋ฒ”์œ„ : 1995~2016๋…„)ํ•˜์˜€๋‹ค. ๋˜ํ•œ, ๋ฌด์กฐ์น˜ ์‹œ์˜ ์ƒํƒœ์˜ˆ์ธก๋ชจ๋ธ์„ ๊ฐœ๋ฐœํ•˜๋Š” ๊ฒƒ์ด๋ฏ€๋กœ 1990๋…„ ์ดํ›„ ์ค€๊ณต๋œ ๊ต๋Ÿ‰์— ๋Œ€ํ•œ ์ƒํƒœ๋“ฑ๊ธ‰ ๋ฐ์ดํ„ฐ๋ฅผ ์‚ฌ์šฉํ•˜์˜€๋‹ค. ๊ตญ๋‚ด/์™ธ ๋ถ€์žฌ๊ตฌ๋ถ„์„ ์ฐธ๊ณ ํ•˜์—ฌ ์ด 10๊ฐœ์˜ ๋Œ€ํ‘œ๋ถ€์žฌ(๋ฐ”๋‹ฅํŒ, ๊ฑฐ๋”, 2์ฐจ๋ถ€์žฌ, ๊ต๋Œ€/๊ต๊ฐ, ๊ธฐ์ดˆ, ๊ต๋Ÿ‰๋ฐ›์นจ, ์‹ ์ถ•์ด์Œ, ๊ต๋ฉดํฌ์žฅ, ๋ฐฐ์ˆ˜์‹œ์„ค, ๋‚œ๊ฐ„/์—ฐ์„)์™€ ์—ฐ๊ณ„๋œ 69๊ฐœ์˜ ์„ธ๋ถ€๋Œ€ํ‘œ๋ถ€์žฌ๋ฅผ ์ •์˜ํ•˜์˜€๊ณ , ๋ณธ ๋…ผ๋ฌธ์—์„œ๋Š” 69๊ฐœ์˜ ์„ธ๋ถ€๋Œ€ํ‘œ๋ถ€์žฌ ์ค‘ ๊ฐ•๋ฐ•์Šค(ST BOX) ๊ฑฐ๋”๋ฅผ ์˜ˆ์‹œ๋กœ ์ƒํƒœ์˜ˆ์ธก๋ชจ๋ธ ๊ฐœ๋ฐœ ์ ˆ์ฐจ์— ๋Œ€ํ•ด ๋‚˜ํƒ€๋‚ด์—ˆ๋‹ค. ๋จผ์ €, Fig. 2์™€ ๊ฐ™์ด ๋Œ€์ƒ ๊ต๋Ÿ‰ ๋ถ€์žฌ๊ฐ€ ํฌํ•จ๋œ ๊ฐœ๋ณ„ ๊ต๋Ÿ‰๋“ค์˜ ๊ฐ ๊ฒฝ๊ฐ„๋ณ„ ์ƒํƒœ์ด๋ ฅ ๋ฐ์ดํ„ฐ์—์„œ ๋ณด์ˆ˜โ€ค๋ณด๊ฐ• ํšจ๊ณผ๊ฐ€ ํฌํ•จ๋˜์–ด ์‹œ๊ฐ„ ๊ฒฝ๊ณผ์— ๋”ฐ๋ผ ์ถ”์„ธ๊ณก์„ ์ด ์ƒ์Šนํ•˜๋Š” ๊ฒƒ์„ ๋ฐฉ์ง€ํ•˜๊ณ ์ž ๋ณด์ˆ˜โ€ง๋ณด๊ฐ•์œผ๋กœ ์ธํ•œ ์ƒํƒœ ํ–ฅ์ƒ ๋ฐ์ดํ„ฐ๋ฅผ ์ œ๊ฑฐํ•˜๊ณ , ๊ฐ ๊ฒฝ๊ฐ„๋ณ„ ์ƒํƒœ์ด๋ ฅ ๋ฐ์ดํ„ฐ๊ฐ€ 1๊ฐœ์˜ ๋ฐ์ดํ„ฐ๋งŒ ์žˆ๋Š” ๊ฒฝ์šฐ ์—ดํ™” ๊ฒฝํ–ฅ์„ฑ ํŒŒ์•… ๋ฐ ๋ณด์ˆ˜โ€ง๋ณด๊ฐ• ์กฐ์น˜์—ฌ๋ถ€๋ฅผ ํŒŒ์•…ํ•  ์ˆ˜ ์—†์œผ๋ฏ€๋กœ ์ œ๊ฑฐํ•˜๋Š” ๋ฐ์ดํ„ฐ ์ „์ฒ˜๋ฆฌ ์ž‘์—…์„ ์ˆ˜ํ–‰ํ•œ๋‹ค. y์ถ•์€ ์„ธ๋ถ€์ง€์นจ(MOLIT, 2012)์—์„œ ๊ธฐ์ˆ ๋œ ๊ฒฐํ•จ๋„ ์ ์ˆ˜๋ฅผ, x์ถ•์€ ๊ณต์šฉ์—ฐ์ˆ˜(์ ๊ฒ€์ผ์ž-์ค€๊ณต์ผ์ž)๋ฅผ ๋‚˜ํƒ€๋‚ธ๋‹ค.

Figure_KSCE_38_4_01_F2.jpg
Fig. 2.

Schematic for Prior Data Processing

์ƒํƒœ๋“ฑ๊ธ‰ ๋ฐ์ดํ„ฐ๋Š” ์ƒํƒœ๊ฐ€ ์–‘ํ˜ธํ•œ ๊ฒƒ์— ๋”ฐ๋ผ์„œ A, B, C, D, E๋“ฑ๊ธ‰์œผ๋กœ ๋‚˜๋‰œ๋‹ค. ๊ตญ๋„ ์ƒ ๊ต๋Ÿ‰์˜ ์ƒํƒœ๋“ฑ๊ธ‰์ด๋ ฅ ๋ฐ์ดํ„ฐ ์ค‘ ํŠนํžˆ, ์ƒ/ํ•˜๋ถ€๊ตฌ์กฐ ๋ถ€์žฌ์˜ ๊ฒฝ์šฐ, ์ „๋ฐ˜์ ์œผ๋กœ B๋“ฑ๊ธ‰์— ๋งŽ์ด ๋ถ„ํฌํ•˜๊ณ  ์žˆ์–ด ๋ชจ๋“  ๋ฐ์ดํ„ฐ์— ๋Œ€ํ•ด ํšŒ๊ท€๋ถ„์„์„ ํ•  ๊ฒฝ์šฐ, ์—ดํ™”๊ฒฝํ–ฅ์„ฑ์ด ํŒŒ์•…๋˜์ง€ ์•Š๊ณ  ์‹ค์ œ์ ์ธ ๋ฐ์ดํ„ฐ์˜ ๊ฒฝํ–ฅ์„ฑ์„ ํŒŒ์•…ํ•  ์ˆ˜ ์—†๋‹ค. ๋”ฐ๋ผ์„œ ๋Œ€์ƒ ๊ต๋Ÿ‰ ๋ถ€์žฌ์˜ ๊ฐ ๊ฒฝ๊ฐ„๋ณ„ ์ƒํƒœ์ด๋ ฅ๋ฐ์ดํ„ฐ์— ๋Œ€ํ•ด์„œ ๋‹จ๋ณ€์ˆ˜ ํšŒ๊ท€๋ถ„์„์„ ์‹ค์‹œํ•˜์—ฌ ๊ฐ ์—ดํ™” ๊ธฐ์šธ๊ธฐ๋ฅผ ๊ณ„์‚ฐํ•˜์˜€๋‹ค.

Fig. 3์€ ๋ณธ ๋…ผ๋ฌธ์—์„œ ์‚ฌ์šฉ๋œ ๊ฐ•๋ฐ•์Šค ๊ฑฐ๋”์˜ ๋ฐ์ดํ„ฐ๋ฅผ ๊ธฐ๋ฐ˜์œผ๋กœ ๋‹จ๋ณ€์ˆ˜ ํšŒ๊ท€๋ถ„์„ ์ „์ฒ˜๋ฆฌ ํ›„ ๋ฐ์ดํ„ฐ(๋ถ„ํฌ)๋ฅผ ๋‚˜ํƒ€๋‚ธ๋‹ค. ๋ฐ์ดํ„ฐ ์ „์ฒ˜๋ฆฌ ํ›„ ๊ฐ•๋ฐ•์Šค ๊ฑฐ๋” ๊ต๋Ÿ‰์˜ ๊ฐœ์†Œ์ˆ˜๋Š” 1,071๊ฐœโ†’670๊ฐœ๋กœ ์ค„์–ด๋“ค์—ˆ๊ณ , ๋“ฑ๊ธ‰๋ณ„ ๋ฐ์ดํ„ฐ ๋ถ„ํฌ๋ฅผ ์‚ดํŽด๋ณด๋ฉด A๋“ฑ๊ธ‰ ๋ฐ์ดํ„ฐ๋Š” 6,622๊ฐœโ†’5,124๊ฐœ, B๋“ฑ๊ธ‰ ๋ฐ์ดํ„ฐ๋Š” 7,642๊ฐœโ†’6,912๊ฐœ, C๋“ฑ๊ธ‰ ๋ฐ์ดํ„ฐ๋Š” 687๊ฐœโ†’620๊ฐœ๋กœ ์ฒ˜๋ฆฌ๋˜์—ˆ๋‹ค. ๋˜ํ•œ, ๊ฐ ๋“ฑ๊ธ‰๋ณ„ ๋ฐ์ดํ„ฐ ๋ถ„ํฌ๋ฅผ ์‚ดํŽด๋ณด๋ฉด A๋“ฑ๊ธ‰ ๋ฐ์ดํ„ฐ๋Š” ํ‰๊ท  5.1๋…„, ํ‘œ์ค€ํŽธ์ฐจ 3๋…„, B๋“ฑ๊ธ‰ ๋ฐ์ดํ„ฐ๋Š” ํ‰๊ท  10๋…„, ํ‘œ์ค€ํŽธ์ฐจ 4.2๋…„, C๋“ฑ๊ธ‰ ๋ฐ์ดํ„ฐ๋Š” Fig. 3(b)์™€ ๊ฐ™์ด ํ‰๊ท  13.8๋…„, ํ‘œ์ค€ํŽธ์ฐจ๊ฐ€ 4๋…„์ธ ์ •๊ทœ๋ถ„ํฌ์˜ ํŠน์„ฑ์„ ๋‚˜ํƒ€๋‚ด์—ˆ๋‹ค.

Figure_KSCE_38_4_01_F3.jpg
Fig. 3.

Prior Data Processing and Distribution at C Grade

Fig. 4์—์„œ๋Š” ๊ฐ•๋ฐ•์Šค ๊ฑฐ๋”์˜ ๊ต๋Ÿ‰๋ณ„(๊ฒฝ๊ฐ„๋ณ„) ๋‹จ๋ณ€์ˆ˜ ํšŒ๊ท€๋ถ„์„์— ๋”ฐ๋ฅธ ๊ฐ๊ฐ์˜ ์—ดํ™”๊ธฐ์šธ๊ธฐ์™€ ๊ทธ๋“ค์˜ ํ‰๊ท  ์—ดํ™”๊ธฐ์šธ๊ธฐ ๊ฒฐ๊ณผ๋ฅผ ๊ฐ€์‹œํ™”ํ•˜์˜€๋‹ค. ์˜ˆ๋ฅผ ๋“ค์–ด, 1991๋…„์— ์ค€๊ณต๋œ ์‹ ๋‚จ๊ต(010042)์˜ ๊ฐ ๊ฒฝ๊ฐ„๋ณ„/๋“ฑ๊ธ‰๋ณ„ ์ ๊ฒ€์ด๋ ฅ ๋ฐ์ดํ„ฐ๋ฅผ ์ด์šฉํ•˜์—ฌ ํ•˜๋‚˜์˜ ์ถ”์„ธ๊ณก์„ ์„ ์‚ฐ์ถœํ•  ์ˆ˜ ์žˆ๋‹ค. ์ด๋•Œ ์ถ”์„ธ๊ณก์„ ์ธ ํšŒ๊ท€์‹์€ ์ง์„ , 2์ฐจ ๊ณก์„ , ์ง€์ˆ˜๊ณก์„  ๋“ฑ ๋‹ค์–‘ํ•œ ํ˜•ํƒœ๋กœ ํšŒ๊ท€๊ฒฐ์ •๊ณ„์ˆ˜(R2)๋ฅผ ์‚ฐ์ถœํ•˜๊ณ , ๊ฐ€์žฅ ํšŒ๊ท€๊ฒฐ์ •๊ณ„์ˆ˜(R2)๊ฐ€ ๋†’์€ ๋ชจ๋ธ์„ ์ตœ์ข… ์ƒํƒœ์˜ˆ์ธก๋ชจ๋ธ๋กœ ์„ ์ •ํ•˜์˜€๋‹ค. ๋ณธ ๋…ผ๋ฌธ์—์„œ ์‚ฌ์šฉ๋œ ๊ฐ•๋ฐ•์Šค ๊ฑฐ๋”(์ƒ๋ถ€๊ตฌ์กฐ)์˜ ๊ฒฝ์šฐ 1์ฐจ ์ง์„  ํšŒ๊ท€์‹์ด ๊ฐ€์žฅ ํšŒ๊ท€๊ฒฐ์ •๊ณ„์ˆ˜(R2)๊ฐ€ ๋†’์€ ๊ฒƒ์œผ๋กœ ๋ถ„์„๋˜์—ˆ๋‹ค. ์ฆ‰, ์œ„์—์„œ ์–ธ๊ธ‰ํ•œ ๋ฐ”์™€ ๊ฐ™์ด ๋ฐ์ดํ„ฐ ์ „์ฒ˜๋ฆฌ ํ›„ ๊ต๋Ÿ‰์€ 670๊ฐœ์†Œ์ด๊ณ , ์ด์— ํ•ด๋‹นํ•˜๋Š” ๊ฐ๊ฐ์˜ ์ถ”์„ธ๊ณก์„ ๊ณผ ์„ธ ๊ฐ€์ง€ ํšŒ๊ท€์‹์— ๋”ฐ๋ฅธ ํšŒ๊ท€๊ฒฐ์ •๊ณ„์ˆ˜(R2)๋ฅผ ์‚ฐ์ถœ ๋ฐ ๋น„๊ต ํ›„ ๊ทธ๋“ค์˜ ํ‰๊ท  ์—ดํ™”๊ธฐ์šธ๊ธฐ(0.0224)๋ฅผ ์‚ฐ์ •ํ•˜์˜€๋‹ค. ๊ทธ์— ๋”ํ•˜์—ฌ, ๊ฐ ๊ต๋Ÿ‰ ๋ถ€์žฌ๋ณ„ ์ƒ์„ธ์ œ์› ๋ฐ์ดํ„ฐ ๋ฐ ๋‹ค์ค‘ํšŒ๊ท€๋ถ„์„์„ ์œ„ํ•œ ์˜ํ–ฅ์ธ์ž ๋ฐ์ดํ„ฐ๋ฅผ ์ˆ˜์ง‘ํ•˜์—ฌ ๊ตฌ์ถ•ํ•˜์˜€๋‹ค. ๊ต๋Ÿ‰์˜ ๋ถ€์žฌ๋Š” ์ผ๋ฐ˜์ ์ธ ์š”์†Œ(๊ณต์šฉ์—ฐ์ˆ˜, ๊ฒฝ๊ฐ„์ˆ˜, ๊ฒฝ๊ฐ„์žฅ ๋“ฑ), ๊ตฌ์กฐ์  ์š”์†Œ(๊ฑฐ๋” ํ˜•์‹ ๋“ฑ), ๊ตํ†ต๋Ÿ‰, ํ™˜๊ฒฝ์  ์š”์†Œ(์—ผํ™”๋ฌผ, ์Šต๋„, ์˜จ๋„ ๋“ฑ) ๋“ฑ์˜ ์˜ํ–ฅ์œผ๋กœ ์—ดํ™”๊ฐ€ ๋œ๋‹ค. ๋ณธ ๋…ผ๋ฌธ์—์„œ๋Š” ๊ตญ/๋‚ด์™ธ ๊ต๋Ÿ‰ ์—ดํ™”๋ชจ๋ธ ์—ฐ๊ตฌ(MLTMA, 2012)์—์„œ ๊ณ ๋ ค๋œ ์˜ํ–ฅ์ธ์ž ์ข…๋ฅ˜๋ฅผ ์ฐธ๊ณ ํ•˜์—ฌ ๊ณต์šฉ์—ฐ์ˆ˜, ๊ฒฝ๊ฐ„์žฅ, ๊ตํ†ต๋Ÿ‰, ํ‘œ๋ฉด์—ผํ™”๋ฌผ๋Ÿ‰, ํ‰๊ท ์Šต๋„, ์ ์„ค๋Ÿ‰ ๋“ฑ์„ ์˜ํ–ฅ์ธ์ž๋กœ ์šฐ์„  ์„ ์ •ํ•˜๊ณ , ์˜ํ–ฅ์ธ์ž๋“ค ๊ฐ„์˜ ์ƒ๊ด€๋ถ„์„์„ ์‹ค์‹œํ•œ๋‹ค. ์ƒ๊ด€๋ถ„์„์˜ ๊ฒฝ์šฐ, ๊ฐ ๊ฐœ๋ณ„ ์˜ํ–ฅ์ธ์ž๋ณ„ ์—ดํ™”์œจ ์ฆ๊ฐ€๋Ÿ‰๊ณผ ๋น„๋ก€ ๊ด€๊ณ„ ์—ฌ๋ถ€๋ฅผ ๋ถ„์„ํ•˜์˜€๋‹ค. ์˜ˆ๋ฅผ ๋“ค์–ด, ๊ต๋Ÿ‰ ๋ถ€์žฌ์˜ ์ผ๋ฐ˜์  ์š”์†Œ์ธ ๊ฒฝ๊ฐ„์žฅ์ด ๋Š˜์–ด๋‚ ์ˆ˜๋ก ์—ดํ™”๊ธฐ์šธ๊ธฐ๋„ ์ฆ๊ฐ€ํ•˜๋Š” ๊ฒฝํ–ฅ์„ ๋ณด์ธ๋‹ค. ์ฆ‰, ์ด๋Ÿฌํ•œ ์ƒ๊ด€๋ถ„์„์„ ํ†ตํ•ด ๊ฐ ์˜ํ–ฅ์ธ์ž ์š”์†Œ๋ณ„ ์—ดํ™”์œจ ์ฆ๊ฐ€๋Ÿ‰์— ๊ฐ€์žฅ ํฌ๊ฒŒ ์˜ํ–ฅ์„ ๋ฏธ์น˜๋Š” 4๊ฐ€์ง€ ์ฃผ์š” ์˜ํ–ฅ์ธ์ž(๊ฒฝ๊ฐ„์žฅ, ํ‰๊ท  ์ผ ํŠธ๋Ÿญ๊ตํ†ต๋Ÿ‰, ํ‘œ๋ฉด์—ผํ™”๋ฌผ๋Ÿ‰, ํ‰๊ท ์Šต๋„)๋ฅผ ์„ ์ •ํ•˜์˜€๋‹ค. ์•ž ๋‹จ๊ณ„์˜ ๊ณต์šฉ์—ฐ์ˆ˜๋ฅผ ๊ณ ๋ คํ•œ ๋‹จ๋ณ€์ˆ˜ ํšŒ๊ท€๋ถ„์„ ์—ดํ™”์œจ ๊ธฐ์šธ๊ธฐ๋ฅผ ์ข…์†๋ณ€์ˆ˜๋กœ ํ•˜๊ณ , ์„ ์ •๋œ 4๊ฐ€์ง€ ์˜ํ–ฅ์ธ์ž์— ๋Œ€ํ•ด์„œ ๋‹ค๋ณ€์ˆ˜ ํšŒ๊ท€๋ถ„์„์„ ์‹ค์‹œํ•˜์—ฌ ์ตœ์ข… ์ƒํƒœ์˜ˆ์ธก๋ชจ๋ธ์„ ์‚ฐ์ถœํ•˜์˜€๋‹ค. Eq. (1)์€ ๋ถ€์žฌ๋ณ„ ์ƒํƒœ์˜ˆ์ธก๋ชจ๋ธ ์‚ฐ์ถœ์„ ์œ„ํ•œ ๋‹ค๋ณ€์ˆ˜ ํšŒ๊ท€๋ถ„์„ ์‹์ด๋‹ค.

Figure_KSCE_38_4_01_M1.gif (1)

์—ฌ๊ธฐ์„œ, Y๋Š” ๊ต๋Ÿ‰ ๋ถ€์žฌ๋ณ„ ์ƒํƒœ์˜ˆ์ธก๋ชจ๋ธ์˜ ๊ธฐ์šธ๊ธฐ๋ฅผ ๋‚˜ํƒ€๋‚ด๋ฉฐ, ai(i=0~10)๋Š” ๋‹ค๋ณ€์ˆ˜ ํšŒ๊ท€๋ถ„์„์„ ํ†ตํ•ด ์‚ฐ์ถœ๋œ ๊ณ„์ˆ˜ ๊ฐ’์ด๋ฉฐ, xi(i=1~4)๋Š” ๊ฐ๊ฐ ๊ฒฝ๊ฐ„์žฅ, ํ‰๊ท  ์ผ ํŠธ๋Ÿญ๊ตํ†ต๋Ÿ‰(1์ผ๋‹น์˜ ํ‰๊ท  ํŠธ๋Ÿญ๊ตํ†ต๋Ÿ‰), ํ‘œ๋ฉด์—ผํ™”๋ฌผ๋Ÿ‰ ๋ฐ ํ‰๊ท ์Šต๋„๋ฅผ ๋‚˜ํƒ€๋‚ธ๋‹ค.

Figure_KSCE_38_4_01_F4.jpg
Fig. 4.

Univariate Regression Analysis for ST BOX Girder

Fig. 5์™€ ๊ฐ™์€ ๋‹ค๋ณ€์ˆ˜ ํšŒ๊ท€๋ถ„์„์„ ํ†ตํ•ด ๊ต๋Ÿ‰ ๋ถ€์žฌ๋ณ„ ์—ดํ™”๋ชจ๋ธ ์‚ฐ์ถœ์ด ๊ฐ€๋Šฅํ•˜๋‹ค. Fig. 6์—์„œ๋Š” ๋‹ค๋ณ€์ˆ˜ ํšŒ๊ท€๋ถ„์„์„ ํ†ตํ•ด ์‚ฐ์ถœ๋œ ๊ฐ•๋ฐ•์Šค ๊ฑฐ๋”์˜ ์ตœ์ข… ์—ดํ™”๋ชจ๋ธ์„ ๋‚˜ํƒ€๋‚ด์—ˆ๋‹ค. ์‹ค์„ ์œผ๋กœ ํ‘œ์‹œ๋œ ๊ธฐ์šธ๊ธฐ๋Š” ๊ฐ•๋ฐ•์Šค ๊ฑฐ๋” ๊ต๋Ÿ‰๊ตฐ์˜ ํ‰๊ท (ฮผ1) ์—ดํ™” ๊ธฐ์šธ๊ธฐ๋ฅผ, ์ ์„ ์œผ๋กœ ํ‘œ์‹œ๋œ ๊ธฐ์šธ๊ธฐ๋Š” ํ‰๊ท ((ฮผ1)โˆ“ํ‘œ์ค€ํŽธ์ฐจ(ฯƒ1) ์—ดํ™” ๊ธฐ์šธ๊ธฐ๋ฅผ ๋‚˜ํƒ€๋‚ธ๋‹ค. ์ด๋•Œ, y์ถ•์€ ์ƒํƒœ์ ์ˆ˜(1-๊ฒฐํ•จ๋„ ์ ์ˆ˜)๋กœ ๋ณ€ํ™˜ํ•˜์˜€๋Š”๋ฐ, ์ด๋Š” ๊ต๋Ÿ‰ ๋ถ€์žฌ์˜ ์—ดํ™”๋ฅผ ๋ณด๋‹ค ์ง๊ด€์ ์œผ๋กœ ํ™•์ธํ•˜๊ณ ์ž ํ•จ์ด๋‹ค. ์ด๋Ÿฌํ•œ ๊ต๋Ÿ‰ ๋ถ€์žฌ๋ณ„ ์ƒํƒœ์˜ˆ์ธก๋ชจ๋ธ์€ ์ตœ์  ์œ ์ง€๊ด€๋ฆฌ ์ „๋žต ์ˆ˜๋ฆฝ ๋ฐ ๊ต๋Ÿ‰์˜ ์ƒํƒœ์˜ˆ์ธก, ์œ ์ง€๊ด€๋ฆฌ ์‹œ๊ธฐ ๊ฒฐ์ •, ๋ณด์ˆ˜โ€ง๋ณด๊ฐ• ํˆฌ์ž… ์˜ˆ์‚ฐ ์‚ฐ์ • ๋“ฑ ์˜์‚ฌ๊ฒฐ์ • ์‹œ๋‚˜๋ฆฌ์˜ค ๊ตฌ์ถ• ์‹œ ํ™œ์šฉํ•˜๊ฒŒ ๋œ๋‹ค.

Figure_KSCE_38_4_01_F5.jpg
Fig. 5.

Processes Developing a Bridge Sub-element Deterioration Model with Multivariate Regression Analysis

Figure_KSCE_38_4_01_F6.jpg
Fig. 6.

Deterioration Model of Steel Box Girder

2.2 ๋ชจ๋‹ˆํ„ฐ๋ง ๊ธฐ๋ฐ˜ ๋ฒ ์ด์ง€์•ˆ ์—…๋ฐ์ดํŠธ ์ ์šฉ

2.2.1 ๋ฒ ์ด์ฆˆ ์ •๋ฆฌ

๋ณธ ์ ˆ์—์„œ๋Š” ์‚ฌ์ „(Prior)์— ์•Œ๊ณ  ์žˆ๋Š” ๊ต๋Ÿ‰ ๋ถ€์žฌ๋ณ„ ์ƒํƒœ์˜ˆ์ธก๋ชจ๋ธ์˜ ํ–ฅํ›„ ํŠน์ • ์‹œ์ (t)์—์„œ ์ถ”๊ฐ€๋˜๋Š” ์‹ค์ œ ๋Œ€์ƒ ๊ต๋Ÿ‰์˜ ์†์ƒ์— ๋”ฐ๋ฅธ ์ ๊ฒ€์ด๋ ฅ ๋ฐ์ดํ„ฐ ํŠน์„ฑ(Likelihood)์„ ๊ธฐ๋ฐ˜์œผ๋กœ ์ƒํƒœ์˜ˆ์ธก๋ชจ๋ธ ์—…๋ฐ์ดํŠธ(Posterior)๋ฅผ ์œ„ํ•œ ํ•˜๋‚˜์˜ ํ™•๋ฅ  ๊ธฐ๋ฒ•์ธ ๋ฒ ์ด์ฆˆ ์ •๋ฆฌ ์ ์šฉ ๋ฐฉ์•ˆ์— ๋Œ€ํ•ด ๊ธฐ์ˆ ํ•˜์˜€๋‹ค.

์‹œ๊ฐ„์— ์—ฐ์†์ ์ธ ํ˜•ํƒœ๋กœ ์ƒํƒœ๊ฐ€ ์ €ํ•˜๋˜๋Š” ๊ต๋Ÿ‰ ์—ดํ™”๋ชจ๋ธ์„ ์กฐ๊ฑด๋ถ€ ํ™•๋ฅ ๊ณผ ์ „ํ™•๋ฅ  ์ •๋ฆฌ์˜ ๊ฐœ๋…์„ ํ† ๋Œ€๋กœ ์ •๋ฆฌํ•œ ๋ฒ ์ด์ฆˆ ์ด๋ก (Ang and Tang, 2007)์— ์ ์šฉํ•  ๋•Œ, ์•„๋ž˜์˜ Eq. (2)์™€ ๊ฐ™์ด ํ‘œํ˜„ํ•  ์ˆ˜ ์žˆ๋‹ค.

Figure_KSCE_38_4_01_M2.gif (2)

์—ฌ๊ธฐ์„œ, x๋Š” ๊ต๋Ÿ‰ ๊ด€๋ฆฌ์ž๊ฐ€ ์ •ํ•œ ๋ชจ๋‹ˆํ„ฐ๋ง ์‹œ์ (t)์—์„œ ๋Œ€์ƒ ๊ต๋Ÿ‰(ํ˜น์€ ๋ถ€์žฌ) ๊ฒฝ๊ฐ„์˜ ์ ๊ฒ€ ๋ฐ ๋ชจ๋‹ˆํ„ฐ๋ง์„ ํ†ตํ•ด ๊ด€์ธก๋œ ์†์ƒ์œ ํ˜•์œผ๋กœ๋ถ€ํ„ฐ ์–ป์–ด์ง„ ์ƒํƒœ๋“ฑ๊ธ‰ ๋ฐ์ดํ„ฐ(A, B, C, D, E)๋กœ์จ ๋Œ€์ฒด๋กœ ์ •๊ทœ๋ถ„ํฌ๋ฅผ ๋”ฐ๋ฅด๊ณ , Eq. (3)๊ณผ ๊ฐ™์ด ํ‘œํ˜„ํ•  ์ˆ˜ ์žˆ๋‹ค. ฯƒ2 ์€ ์ ๊ฒ€ ๋ฐ ๋ชจ๋‹ˆํ„ฐ๋ง ๊ธฐ๋ฒ•์— ๋”ฐ๋ฅธ ๋ถˆํ™•์‹ค์„ฑ(์ •ํ™•๋„)์„ ๋‚˜ํƒ€๋‚ด๋ฉฐ, ๊ธฐ์กด์— ์•Œ๊ณ  ์žˆ๋Š” ๊ฐ’์ด๋ผ๊ณ  ๊ฐ€์ •ํ•˜์˜€๋‹ค(Sun et al., 2010; KAIA, 2013).

Figure_KSCE_38_4_01_M3.gif (3)

๋˜ํ•œ, ํ™•๋ฅ ๋ณ€์ˆ˜๋“ค์— ๋Œ€ํ•œ ์ •์˜๋Š” ๋‹ค์Œ๊ณผ ๊ฐ™๋‹ค. ฮผ(์ฆ‰, x์˜ ํ‰๊ท  ํŒŒ๋ผ๋ฏธํ„ฐ)๋Š” Eq. (4)์™€ ๊ฐ™์ด ์ •๊ทœ๋ถ„ํฌ๋ฅผ ๋”ฐ๋ฅธ๋‹ค๊ณ  ๊ฐ€์ •ํ•œ๋‹ค.

Figure_KSCE_38_4_01_M4.gif (4)

Eqs. (2)~(4)์˜ ํ•จ์ˆ˜๋“ค์— ๋Œ€ํ•œ ์ •์˜๋Š” ๋‹ค์Œ๊ณผ ๊ฐ™๋‹ค. f(ฮผ)๋Š” ์ ๊ฒ€ ๋ฐ ๋ชจ๋‹ˆํ„ฐ๋ง ์‹œ์ (t)์—์„œ์˜ ๋ชจ๋‹ˆํ„ฐ๋ง ์‹ค์‹œ ์ „์— ์•Œ๊ณ  ์žˆ๋Š” ํ‰๊ท ์ด ฮผ1์ด๊ณ , ๋ถ„์‚ฐ์ด ฯƒ12์ธ ์ •๊ทœ๋ถ„ํฌ ํ™•๋ฅ ๋ฐ€๋„ํ•จ์ˆ˜๋กœ ์‚ฌ์ „(Prior)์ •๋ณด์— ํ•ด๋‹นํ•˜๊ณ , f(x๏ฝœฮผ)๋Š” ์ ๊ฒ€ ๋ฐ ๋ชจ๋‹ˆํ„ฐ๋ง ์‹œ์ (t)์—์„œ ๋ชจ๋‹ˆํ„ฐ๋ง ์‹ค์‹œ ํ›„ ์‚ฌ์ „๋ถ„ํฌ์—์„œ ์ ๊ฒ€์ด๋ ฅ ๋ฐ์ดํ„ฐ x๊ฐ€ ๋ฐœ๊ฒฌ๋  ์ •๊ทœ๋ถ„ํฌ ํ™•๋ฅ ๋ฐ€๋„ํ•จ์ˆ˜๋กœ ์šฐ๋„(Likelihood)ํ•จ์ˆ˜์— ํ•ด๋‹นํ•˜๋ฉฐ, f(ฮผ๏ฝœx)๋Š” ์ ๊ฒ€ ๋ฐ ๋ชจ๋‹ˆํ„ฐ๋ง ์‹œ์ (t)์—์„œ ๋ชจ๋‹ˆํ„ฐ๋ง ์‹ค์‹œ ํ›„, ๊ด€์ธก๋œ ์ ๊ฒ€์ด๋ ฅ ๋ฐ์ดํ„ฐ x๋ฅผ ํ†ตํ•ด ์ถ”์ •(์—…๋ฐ์ดํŠธ)๋œ ฮผ์˜ ์ƒˆ๋กœ์šด ํ™•๋ฅ ๋ฐ€๋„ํ•จ์ˆ˜๋กœ ์‚ฌํ›„(Posterior)ํ™•๋ฅ ๋กœ ์ •์˜ํ•  ์ˆ˜ ์žˆ๋‹ค. k๋Š” ํ™•๋ฅ ๋ฐ€๋„ํ•จ์ˆ˜์˜ ์„ฑ์งˆ์„ ๊ฐ–๊ฒŒ ํ•˜๊ธฐ ์œ„ํ•œ ์ •๊ทœํ™” ๊ณ„์ˆ˜๋กœ ์ „ํ™•๋ฅ  ์ •๋ฆฌ์— ๋”ฐ๋ผ์„œ Eq. (5)์™€ ๊ฐ™์ด ์ •์˜๋œ๋‹ค.

Figure_KSCE_38_4_01_M5.gif (5)

2.2.2 ์ •๊ทœ๋ถ„ํฌ์— ๋Œ€ํ•œ ๋ฒ ์ด์ง€์•ˆ ์ถ”๋ก 

์•ž ์ ˆ์—์„œ ๋ฐํ˜”๋“ฏ์ด ์‚ฌํ›„ํ™•๋ฅ ๋ฐ€๋„ํ•จ์ˆ˜ f(ฮผ๏ฝœx)๋Š” ์ •๊ทœํ™” ๊ณ„์ˆ˜(k)์™€ ์‚ฌ์ „ ์ •๊ทœ๋ถ„ํฌ ํ™•๋ฅ ๋ฐ€๋„ํ•จ์ˆ˜์ธ f(ฮผ), ์šฐ๋„ํ•จ์ˆ˜(์ •๊ทœ๋ถ„ํฌ ํ™•๋ฅ ๋ฐ€๋„ํ•จ์ˆ˜) f(x๏ฝœฮผ)์˜ ๊ณฑ, ์ฆ‰, ์„ธ ๊ฐ€์ง€ ํ•ญ์˜ ๊ณฑ์œผ๋กœ ํ‘œํ˜„๋œ๋‹ค. ๋ณธ ์ ˆ์—์„œ๋Š” ์ด๋Ÿฌํ•œ ์„ธ ๊ฐ€์ง€ ํ•ญ์˜ ๊ณฑ์œผ๋กœ ์ด๋ฃจ์–ด์ง„ ์‚ฌํ›„ํ™•๋ฅ ๋ฐ€๋„ํ•จ์ˆ˜์˜ ํŒŒ๋ผ๋ฏธํ„ฐ(ํ‰๊ท , ๋ถ„์‚ฐ) ๋ถ„ํฌ์— ๋Œ€ํ•œ ์ถ”์ •์„ ๋ชฉ์ ์œผ๋กœ ํ•œ๋‹ค.

๋ณธ๊ฒฉ์ ์ธ ํ†ต๊ณ„์  ์ถ”๋ก ์— ์•ž์„œ, ๊ณ ๋ คํ•œ ์ดˆ๊ธฐ ์กฐ๊ฑด๊ณผ ์‚ฌ์ „ ๋ฐ ์šฐ๋„ํ•จ์ˆ˜ํ˜•ํƒœ์˜ ์ •์˜๋Š” ๊ฐ๊ฐ Eqs. (6)~(8)๊ณผ ๊ฐ™๋‹ค.

Figure_KSCE_38_4_01_M6.gif (6)

Figure_KSCE_38_4_01_M7.gif (7)

Figure_KSCE_38_4_01_M8.gif (8)

Eq. (6)์€ ์‚ฌ์ „ ๋ฐ ์šฐ๋„ํ•จ์ˆ˜์˜ ํ™•๋ฅ ๋ณ€์ˆ˜์ธ ๊ฐ๊ฐ์˜ ๋ถ„์‚ฐ์ด 0๋ณด๋‹ค ํฌ๋‹ค๋Š” ์ดˆ๊ธฐ์กฐ๊ฑด์„ ๋‚˜ํƒ€๋‚ด๊ณ , Eqs. (7) and (8)์€ ์‚ฌ์ „ ๋ฐ ์šฐ๋„ํ•จ์ˆ˜๋ฅผ ์ •๊ทœ๋ถ„ํฌ ํ™•๋ฅ ๋ฐ€๋„ํ•จ์ˆ˜์˜ ํ˜•ํƒœ๋กœ ํ‘œํ˜„ํ•œ ๊ฒƒ์ด๋‹ค. Eqs. (7) and (8)์„ Eq. (2)์— ๋Œ€์ž…ํ•˜์—ฌ ์ •๋ฆฌํ•˜๋ฉด Eq. (9)์™€ ๊ฐ™์ด ํ‘œํ˜„ํ•  ์ˆ˜ ์žˆ๋‹ค.

Figure_KSCE_38_4_01_M9.gif (9)

Eq. (9)์— Eq. (5)์—์„œ ์–ธ๊ธ‰ํ•œ k๋ฅผ ๋Œ€์ž…ํ•˜๊ณ , ฮผ๋ฅผ ๊ธฐ์ค€์œผ๋กœ ๊ฐ๊ฐ์˜ ํ•ญ๋“ค๋กœ ์ •๋ฆฌํ•˜๋ฉด Eq. (10)๊ณผ ๊ฐ™์ด ํ‘œํ˜„ํ•  ์ˆ˜ ์žˆ๋‹ค.

Figure_KSCE_38_4_01_M10.gif (10)

์ฆ‰, Eq. (10)์€ ์ •๊ทœ๋ถ„ํฌ ํ™•๋ฅ ๋ฐ€๋„ํ•จ์ˆ˜๋ฅผ ๋‚˜ํƒ€๋‚ธ๋‹ค. ๋˜ํ•œ, ๊ด€์ธก๋œ ์ƒํƒœ์ ๊ฒ€์ด๋ ฅ ๋ฐ์ดํ„ฐ x๊ฐ€ n๊ฐœ์ธ ๊ฒฝ์šฐ, ๋‹จ์ผ ๊ด€์ธก๋œ ๊ฒฐ๊ณผ์˜ ์‚ฌํ›„ํ™•๋ฅ  ๋ถ„ํฌ์˜ ํ˜•ํƒœ์™€ ๋™์ผํ•˜๋ฉฐ, ์ด๋•Œ x๋Š” ํ‰๊ท ๊ฐ’ ฮผ2๋กœ, ฯƒ2์€ ฯƒ2/n ๋˜๋Š” ฯƒ22์œผ๋กœ ํ‘œํ˜„ํ•  ์ˆ˜ ์žˆ๋‹ค. ์ด๋ฅผ ํ†ตํ•ด k์™€ ์‚ฌ์ „ ์ •๊ทœ๋ถ„ํฌ ํ™•๋ฅ ๋ฐ€๋„ํ•จ์ˆ˜์ธ f(ฮผ), ์šฐ๋„ํ•จ์ˆ˜(์ •๊ทœ๋ถ„ํฌ ํ™•๋ฅ ๋ฐ€๋„ํ•จ์ˆ˜) f(x๏ฝœฮผ)์˜ ๊ณฑ, ์ฆ‰, ์„ธ ๊ฐ€์ง€ ํ•ญ์˜ ๊ณฑ์ธ ์‚ฌํ›„ ํ™•๋ฅ ๋ฐ€๋„ํ•จ์ˆ˜[f(ฮผ๏ฝœx)]๊ฐ€ ์ƒˆ๋กœ์šด ์ •๊ทœ๋ถ„ํฌ ํ™•๋ฅ ๋ฐ€๋„ํ•จ์ˆ˜์ž„์„ ์ฆ๋ช…ํ•˜์˜€๊ณ , ์ƒˆ๋กœ์šด ์ •๊ทœ๋ถ„ํฌํ•จ์ˆ˜์˜ ํŒŒ๋ผ๋ฏธํ„ฐ(ํ‰๊ท  ๋ฐ ๋ถ„์‚ฐ)์™€ ์‚ฌํ›„ ํ™•๋ฅ ๋ฐ€๋„ํ•จ์ˆ˜๋Š” ๊ฐ๊ฐ Eqs. (11) and (12)์™€ ๊ฐ™์ด ์ •๋ฆฌํ•  ์ˆ˜ ์žˆ๋‹ค.

Figure_KSCE_38_4_01_M11.gif (11)

Figure_KSCE_38_4_01_M12.gif (12)

2.2.3 ๋ฒ ์ด์ง€์•ˆ ์—…๋ฐ์ดํŠธ์— ๋”ฐ๋ฅธ ๋ถˆํ™•์‹ค์„ฑ ๊ฐ์†Œ

๋ณธ ์ ˆ์—์„œ๋Š” ๋ฒ ์ด์ง€์•ˆ ์ถ”๋ก ์„ ํ†ตํ•ด ์‚ฐ์ถœ๋œ ํ™•๋ฅ  ํŠน์„ฑ์น˜(ฮผ3, ฯƒ32)์™€ ์‚ฌ์ „(ฮผ1, ฯƒ12) ๋ฐ ์šฐ๋„ํ•จ์ˆ˜์˜ ํ™•๋ฅ  ํŠน์„ฑ์น˜(ฮผ2, ฯƒ22) ๊ฐ„์˜ ์ƒ๊ด€๊ด€๊ณ„๋ฅผ ๋‹ค๋ฃฌ๋‹ค. Eqs. (6) and (11)๋กœ๋ถ€ํ„ฐ Eqs. (13) and (14)์™€ ๊ฐ™์€ ๊ฒฐ๋ก ์„ ๋„์ถœํ•  ์ˆ˜ ์žˆ์œผ๋ฉฐ, Fig. 7๊ณผ ๊ฐ™์ด ๋‚˜ํƒ€๋‚ผ ์ˆ˜ ์žˆ๋‹ค.

Figure_KSCE_38_4_01_F7.jpg
Fig. 7.

Schematic for Prior Distribution Update

Figure_KSCE_38_4_01_M13.gif (13)

Figure_KSCE_38_4_01_M14.gif (14)

์ฆ‰, ๋ฒ ์ด์ฆˆ ์ •๋ฆฌ๋ฅผ ํ†ตํ•ด ์—…๋ฐ์ดํŠธ๋œ ์‚ฌํ›„ ์ •๊ทœ๋ถ„ํฌ ํ™•๋ฅ ๋ฐ€๋„ํ•จ์ˆ˜์˜ ๋ถ„์‚ฐ(ฯƒ32)์€ ์‚ฌ์ „ ํ™•๋ฅ ๋ฐ€๋„ํ•จ์ˆ˜์˜ ๋ถ„์‚ฐ(ฯƒ12)๊ณผ ์šฐ๋„ ํ™•๋ฅ ๋ฐ€๋„ํ•จ์ˆ˜์˜ ๋ถ„์‚ฐ(ฯƒ22)๋ณด๋‹ค ํ•ญ์ƒ ์ž‘๋‹ค(Ang and Tang, 2007).

3. ๋ชจ๋‹ˆํ„ฐ๋ง ๊ธฐ๋ฐ˜ ์œ ์ง€๊ด€๋ฆฌ๋น„์šฉ ๋ชจ๋ธ ์ œ์•ˆ

3.1 ๋‹จ๊ณ„๋ณ„ ์œ ์ง€๊ด€๋ฆฌ๋น„์šฉ ๋ถ„์„ ๊ฐœ์š”

๊ต๋Ÿ‰์˜ ์ด ์ƒ์• ์ฃผ๊ธฐ๋น„์šฉ์€ ์ดˆ๊ธฐํˆฌ์ž๋น„์šฉ, ์œ ์ง€๊ด€๋ฆฌ๋น„์šฉ, ํ•ด์ฒดโ€งํ๊ธฐ๋น„์šฉ ์„ธ ๊ฐ€์ง€๋กœ ๋ถ„๋ฅ˜๋˜๋Š”๋ฐ ๋ณธ ๋…ผ๋ฌธ์—์„œ๋Š” ์œ ์ง€๊ด€๋ฆฌ๋น„์šฉ ํ•ญ๋ชฉ์„ ๊ณ ๋ คํ•˜์˜€๋‹ค. ์œ ์ง€๊ด€๋ฆฌ๋น„์šฉ ์‚ฐ์ถœ ์‹œ, ํ•„์š”ํ•œ ์œ ์ง€๊ด€๋ฆฌ ์‹œ๋‚˜๋ฆฌ์˜ค๋Š” ํฌ๊ฒŒ ์„ค๊ณ„โ€ง๊ณ„ํš๋‹จ๊ณ„์™€ ์šด์˜๋‹จ๊ณ„ ๋‘ ๊ฐ€์ง€๋กœ ๊ตฌ๋ถ„ํ•  ์ˆ˜ ์žˆ๋‹ค. ์„ค๊ณ„โ€ง๊ณ„ํš๋‹จ๊ณ„๋Š” ๊ฐ€์„ค ํ˜น์€ ๊ฑด์„ค๋œ ๊ต๋Ÿ‰์˜ ์šด์˜ ์ „ ๋‹จ๊ณ„๋กœ ๋ณผ ์ˆ˜ ์žˆ๋‹ค. ์ด๋Š” ์ƒ์• ์ฃผ๊ธฐ๊ฐ€ ์ง„์ „๋จ์— ๋”ฐ๋ผ ๊ต๋Ÿ‰์˜ ๊ฐ ๋ถ€์žฌ๋“ค์˜ ๋ถˆํ™•์‹ค์„ฑ์„ ํฌํ•จํ•œ ์ƒํƒœ๋‚˜ ์„ฑ๋Šฅ์„ ์˜ˆ์ธกํ•˜๊ณ , ํŠน์ • ์‹œ๊ธฐ ๋˜๋Š” ๋ฐœ์ƒ ๊ฐ€๋Šฅํ•œ ์†์ƒ์œ ํ˜•์— ๋”ฐ๋ผ ๋‹ค์–‘ํ•œ ๋ณด์ˆ˜โ€ง๋ณด๊ฐ• ๊ณต๋ฒ• ์ ์šฉ์— ๋”ฐ๋ฅธ ์‹œ๋ฎฌ๋ ˆ์ด์…˜(์‹œ๋‚˜๋ฆฌ์˜ค)์ด ๊ฐ€๋Šฅํ•˜๋‹ค. ์ˆ˜ํ•™์ ์œผ๋กœ ๊ต๋Ÿ‰์˜ ์ƒํƒœ ํ˜น์€ ์„ฑ๋Šฅ์ด ๊ฐ–๋Š” ๋‹ค์–‘ํ•œ ๋ถˆํ™•์‹ค์„ฑ์˜ ๋ถ„ํฌ์— ๋”ฐ๋ผ์„œ ๋“ฑ๊ธ‰์„ ํŒ๋‹จํ•˜๊ณ , ํŠน์ • ๋“ฑ๊ธ‰์— ํ•ด๋‹นํ•˜๋Š” ๋ณด์ˆ˜โ€ง๋ณด๊ฐ• ๊ณต๋ฒ• ์ ์šฉ์„ ๊ธฐ์ดˆํ•œ ์‹œ๋ฎฌ๋ ˆ์ด์…˜์„ ํ•  ์ˆ˜ ์žˆ๋‹ค. ์ด๋Ÿฌํ•œ ์‹œ๋ฎฌ๋ ˆ์ด์…˜ ๊ฒฐ๊ณผ๋ฅผ ์ข…ํ•ฉํ•˜์—ฌ ํŠน์ • ๋ชฉํ‘œ์ˆ˜๋ช… ๊ธฐ๋ฐ˜์˜ ํ‰๊ท  ์ƒ์• ์ฃผ๊ธฐ๋น„์šฉ์„ ์‚ฐ์ถœํ•  ์ˆ˜ ์žˆ๋Š”๋ฐ, ์ด๋ฅผ ์„ค๊ณ„โ€ง๊ณ„ํš๋‹จ๊ณ„๋กœ ์ •์˜ํ•œ๋‹ค.

์šด์˜๋‹จ๊ณ„๋Š” ์‹ค์ œ ๊ณต์šฉ ์ค‘์ธ ๋Œ€์ƒ ๊ต๋Ÿ‰์— ๋ฐœ์ƒํ•œ ์†์ƒ์œ ํ˜•์„ ๊ธฐ๋ฐ˜์œผ๋กœ ๊ฐœ๋ฐœ๋œ ๊ต๋Ÿ‰ ๋ถ€์žฌ๋ณ„ ์ƒํƒœ์˜ˆ์ธก๋ชจ๋ธ์˜ ๋ชจ๋‹ˆํ„ฐ๋ง ์—…๋ฐ์ดํŠธ์— ๋”ฐ๋ฅธ ์ด ์ƒ์• ์ฃผ๊ธฐ๋น„์šฉ์„ ์‚ฐ์ถœ ๋˜๋Š” ์˜ˆ์ธกํ•˜๋Š” ๊ฒƒ์ด๋‹ค. ์„ค๊ณ„โ€ง๊ณ„ํš๋‹จ๊ณ„์™€ ์ฐจ๋ณ„ํ™”๋˜๋Š” ์ ์€ ๊ต๋Ÿ‰ ์ƒ์• ์ฃผ๊ธฐ ๋™์•ˆ ํŠน์ • ์‹œ์ (t)์—์„œ ๋ชจ๋‹ˆํ„ฐ๋ง ๊ธฐ๋ฐ˜ ๋ฒ ์ด์ง€์•ˆ ์—…๋ฐ์ดํŠธ๋ฅผ ํ†ตํ•ด ๋Œ€์ƒ ๊ต๋Ÿ‰ ๋ถ€์žฌ ์ƒํƒœ์˜ˆ์ธก๋ชจ๋ธ ํ™•๋ฅ  ํŠน์„ฑ์น˜(ํ‰๊ท , ํ‘œ์ค€ํŽธ์ฐจ)๋ฅผ ๊ณ„์‚ฐํ•œ๋‹ค๋Š” ์ ์ด๋‹ค. ํŠน์ • ์‹œ์ (t)์— ๋ชจ๋‹ˆํ„ฐ๋ง์„ ํ†ตํ•œ ์ƒํƒœ๋“ฑ๊ธ‰ ๋ฐ์ดํ„ฐ๋ฅผ ๊ธฐ๋ฐ˜์œผ๋กœ ๊ธฐ์กด ์ƒํƒœ์˜ˆ์ธก๋ชจ๋ธ์„ ์—…๋ฐ์ดํŠธํ•˜๋ฉด ๋‹จ์ˆœํ•œ ์ฃผ๊ธฐ์  ๋ณด์ˆ˜โ€ง๋ณด๊ฐ•์ด ์•„๋‹Œ ํŠน์ • ๋“ฑ๊ธ‰์— ๋งž๋Š” ๋ณด์ˆ˜โ€ง๋ณด๊ฐ• ๊ณต๋ฒ•์„ ๋†’์€ ์‹ ๋ขฐ์ˆ˜์ค€์„ ๊ฐ–๊ณ  ์ ์šฉ ๋ฐ ์„ ํƒ์ด ๊ฐ€๋Šฅํ•ด์ง„๋‹ค. ์ฆ‰, ์‹ค์ œ ๋Œ€์ƒ ๊ต๋Ÿ‰์— ๋ฐœ์ƒํ•œ ์†์ƒ์œ ํ˜•์— ๋”ฐ๋ผ์„œ ์ ์šฉ ๊ฐ€๋Šฅํ•œ ๋ณด์ˆ˜โ€ง๋ณด๊ฐ•๊ณต๋ฒ•๋“ค์˜ ์ ์šฉ ๋ฐ ์„ ํƒ์— ๋Œ€ํ•œ ํ™•๋ฅ ์ด ์‚ฐ์ถœ๋œ๋‹ค.

3.2 ๋ชจ๋‹ˆํ„ฐ๋ง ๊ธฐ๋ฐ˜ ์šด์˜๋‹จ๊ณ„ ์œ ์ง€๊ด€๋ฆฌ ๋น„์šฉ๋ถ„์„ ๋ชจ๋ธ

๊ต๋Ÿ‰ ๋˜๋Š” ๊ต๋Ÿ‰ ๋ถ€์žฌ๊ฐ€ ์—ดํ™”๋˜๋Š” ๊ณผ์ •์—์„œ ๊ต๋Ÿ‰ ๊ด€๋ฆฌ์ž๊ฐ€ ์˜ˆ์ธกํ•œ ๋“ฑ๊ธ‰๋ณ„ ๋„๋‹ฌ ์‹œ๊ธฐ์— ์œ ์ง€๋ณด์ˆ˜๋ฅผ ํ•  ๊ฒฝ์šฐ ์ƒํƒœ ํ˜น์€ ์„ฑ๋Šฅ ํ–ฅ์ƒ์„ ํ†ตํ•ด ๊ฒฝ์ œ์ ์œผ๋กœ ๊ตฌ์กฐ๋ฌผ ํ™œ์šฉ์ด ๊ฐ€๋Šฅํ•˜๋‚˜, ์ ์ •์‹œ๊ธฐ๋ฅผ ๋†“์น  ๊ฒฝ์šฐ ์—ดํ™”์ž‘์šฉ์€ ์‚ฌ์šฉ์—ฐํ•œ์ด ์ง€๋‚ ์ˆ˜๋ก ๊ฐ€์†ํ™”๋˜์–ด ๋Œ€๊ทœ๋ชจ ๊ณต๋ฒ•์„ ์ ์šฉํ•ด์•ผ ํ•˜๊ฑฐ๋‚˜ ๊ตฌ์กฐ๋ฌผ์„ ๊ต์ฒดํ•ด์•ผ ํ•˜๋Š” ์‹œ์ ์— ์ด๋ฅด๊ฒŒ ๋œ๋‹ค.

์ด์— ๋”ฐ๋ผ ๋ณธ ์—ฐ๊ตฌ์—์„œ๋Š” ์‹ค์ œ ์šด์˜๋‹จ๊ณ„ ์‹œ ๋ฐœ์ƒ ๊ฐ€๋Šฅํ•œ ์œ ์ง€๊ด€๋ฆฌ ์‹œ๋‚˜๋ฆฌ์˜ค๋ฅผ ๊ณ ๋ คํ•˜๊ณ , ๊ธฐ์กด ์ •๋ฐ€์ ๊ฒ€ ๋ฐ ์ •๋ฐ€์•ˆ์ „์ง„๋‹จ์— ์ถ”๊ฐ€์ ์œผ๋กœ ์„ผ์„œ(๋ชจ๋‹ˆํ„ฐ๋ง ๊ธฐ๊ธฐ)๋ฅผ ํ†ตํ•œ ์œ ์ง€๊ด€๋ฆฌ๋น„์šฉ ์‚ฐ์ • ๋ชจ๋ธ์„ ์ œ์‹œํ•œ๋‹ค. ์„ผ์„œ ๊ธฐ๋ฐ˜ ์ ๊ฒ€์— ๋”ฐ๋ฅธ ์œ ์ง€๊ด€๋ฆฌ๋น„์šฉ ์‚ฐ์ • ๋ชจ๋ธ์€ ๋ฒ ์ด์ง€์•ˆ ๊ธฐ๋ฒ•์„ ๊ณ ๋ คํ•œ ์ƒํƒœ์˜ˆ์ธก๋ชจ๋ธ ๊ฐฑ์‹ ์— ๋”ฐ๋ฅธ ๋ณด์ˆ˜โ€ง๋ณด๊ฐ•์ฃผ๊ธฐ ์—…๋ฐ์ดํŠธ๋ฅผ ํ†ตํ•˜์—ฌ ๋Œ€์ƒ ๊ต๋Ÿ‰ ๋ถ€์žฌ์˜ ์ตœ์  ๋ณด์ˆ˜์‹œ์  ์˜ˆ์ธก์ด ๊ฐ€๋Šฅํ•  ๊ฒƒ์œผ๋กœ ํŒ๋‹จ๋œ๋‹ค.

๋ณธ ์—ฐ๊ตฌ์—์„œ ์ ์šฉํ•œ ๋ชจ๋‹ˆํ„ฐ๋ง ๊ธฐ๋ฐ˜ ์šด์˜๋‹จ๊ณ„ ์œ ์ง€๊ด€๋ฆฌ ๋น„์šฉ๋ถ„์„ ๋ชจ๋ธ์€ Eq. (15)์™€ ๊ฐ™์ด ๋‚˜ํƒ€๋‚ผ ์ˆ˜ ์žˆ๋‹ค.

Figure_KSCE_38_4_01_M15.gif (15)

์—ฌ๊ธฐ์„œ, Figure_KSCE_38_4_01_M17.gif ๋Š” ์Šค๋งˆํŠธ ๋ชจ๋‹ˆํ„ฐ๋ง ๊ธฐ์ˆ  ๊ธฐ๋ฐ˜ ํŠน์ •์‹œ์ (t)๊นŒ์ง€ ๋ฐœ์ƒํ•œ ์ด ์œ ์ง€๊ด€๋ฆฌ๋น„์šฉ์ด๊ณ , CSEN(t0)๋Š” ์ดˆ๊ธฐ(t0) ์„ผ์„œ ์„ค์น˜๋น„์šฉ์ด๋ฉฐ, CINS,UP(t)๋Š” ์—…๋ฐ์ดํŠธ ๋ชจ๋ธ ๊ธฐ๋ฐ˜ ์•ˆ์ „์ ๊ฒ€ ๋ฐ ์ •๋ฐ€์•ˆ์ „์ง„๋‹จ๋น„์šฉ์ด๊ณ , CMAI,UP(ti)๋Š” ์œ ์ง€๋ณด์ˆ˜์‹œ์ (ti)์—์„œ ์—…๋ฐ์ดํŠธ ๋ชจ๋ธ ์—ฐ๊ณ„ ๊ธฐ๋ฐ˜ ์ ์šฉ ๋ณด์ˆ˜โ€ง๋ณด๊ฐ•๊ณต๋ฒ• ๋น„์šฉ์ด๋ฉฐ, PMAI,UPti๋Š” ์œ ์ง€๋ณด์ˆ˜์‹œ์ (ti)์—์„œ ์—…๋ฐ์ดํŠธ ๋ชจ๋ธ ๊ธฐ๋ฐ˜ ์ ์šฉ ๋ณด์ˆ˜โ€ง๋ณด๊ฐ•ํ™•๋ฅ ์ด๊ณ , q๋Š” ํ• ์ธ์œจ(discount rate)์ด๋‹ค.

ํ•œํŽธ, ๋ชจ๋‹ˆํ„ฐ๋ง์ด ์ ์šฉ๋˜์ง€ ์•Š์€ ๊ฒฝ์šฐ, ์ฆ‰, ๊ธฐ์กด ์šด์˜๋‹จ๊ณ„ ์œ ์ง€๊ด€๋ฆฌ ๋น„์šฉ๋ถ„์„ ๋ชจ๋ธ์€ ์„ผ์„œ ๊ด€๋ จ ๋น„์šฉํ•ญ๋ชฉ(CSEN(t0), CSEN, MAI(t))์„ ๊ณ ๋ คํ•˜์ง€ ์•Š๊ณ , ๋‚˜๋จธ์ง€ ๊ธฐ์กด ์•ˆ์ „์ ๊ฒ€ ๋ฐ ์ •๋ฐ€์•ˆ์ „๋‹จ๋น„์šฉ(CINS,EXI(t))๊ณผ ๋ณด์ˆ˜โ€ง๋ณด๊ฐ•๊ณต๋ฒ• ๋น„์šฉ(CMAI,EXI(ti)) ๋ฐ ์ ์šฉ ํ™•๋ฅ (PMAI,EXI(ti))์„ ๊ณ ๋ คํ•œ๋‹ค. ๊ธฐ์กด ์œ ์ง€๊ด€๋ฆฌ ๋น„์šฉ(Figure_KSCE_38_4_01_M18.gif )์€ Eq. (16)๊ณผ ๊ฐ™๋‹ค.

Figure_KSCE_38_4_01_M16.gif (16)

๋ณธ ์—ฐ๊ตฌ์—์„œ ์ œ์‹œํ•˜๊ณ  ์žˆ๋Š” ์Šค๋งˆํŠธ ๋ชจ๋‹ˆํ„ฐ๋ง ๊ธฐ์ˆ  ๊ธฐ๋ฐ˜ ์˜ˆ๋ฐฉ์  ์œ ์ง€๊ด€๋ฆฌ ๋น„์šฉ๋ถ„์„๋ฐฉ๋ฒ•์€ ์ƒ์• ์ฃผ๊ธฐ๋น„์šฉ ๋ถ„์„ ์‹œ ๊ธฐ์กด ์ƒํƒœ์˜ˆ์ธก๋ชจ๋ธ์ด ๊ฐ–๋Š” ๋ถˆํ™•์‹ค์„ฑ(ฯƒ1)์„ ๋ฒ ์ด์ง€์•ˆ ๊ธฐ๋ฒ•์„ ํ†ตํ•ด ์—…๋ฐ์ดํŠธ๋œ ํ™•๋ฅ ๋ถ„ํฌ์˜ ํ˜•ํƒœ, ์ฆ‰ ๋ฐœ์ƒ๋ถ„ํฌ ๋ฐ ๋ˆ„์ ๋ถ„ํฌ์˜ ํ˜•ํƒœ๋กœ ๊ฐ€์‹œํ™”ํ•˜์—ฌ ๋น„์šฉ ๋ฐ ์œ„ํ—˜์š”์†Œ์— ๋Œ€ํ•œ ๋ถˆํ™•์‹ค์„ฑ์ด ๊ฐ์†Œ๋œ, ๋ณด๋‹ค ์ •ํ™•ํ•œ ์˜ˆ์ธก์„ ํ†ตํ•˜์—ฌ ์‹ค์ œ ๊ต๋Ÿ‰ ์šด์˜๋‹จ๊ณ„ ๋น„์šฉ๊ณ„ํš ์ˆ˜๋ฆฝ ์‹œ ์œ ๋ฆฌํ•œ ๋ฐฉ๋ฒ•์ด๋‹ค. ๋˜ํ•œ ๋ฒ ์ด์ง€์•ˆ ์—…๋ฐ์ดํŠธ ์ „๊ณผ ํ›„์˜ ์œ ์ง€๊ด€๋ฆฌ๋น„์šฉ์„ ๋น„๊ตํ•˜์—ฌ ์Šค๋งˆํŠธ ๋ชจ๋‹ˆํ„ฐ๋ง ๊ธฐ์ˆ  ๊ธฐ๋ฐ˜ ์˜ˆ๋ฐฉ์  ์œ ์ง€๊ด€๋ฆฌ๊ฐ€ ๊ธฐ์กด ์œ ์ง€๊ด€๋ฆฌ ๋Œ€๋น„ ๋น„์šฉ ํšจ์œจ์„ฑ ์ธก๋ฉด์—์„œ ์œ ๋ฆฌํ•จ์„ ๊ฒ€์ฆํ•  ์ˆ˜ ์žˆ๋‹ค.

4. ๋ชจ๋‹ˆํ„ฐ๋ง ๊ธฐ๋ฐ˜ ์œ ์ง€๊ด€๋ฆฌ๋น„์šฉ ์‚ฐ์ • ์˜ˆ์‹œ

4.1 ์œ ์ง€๊ด€๋ฆฌ๋น„์šฉ ์‚ฐ์ •์„ ์œ„ํ•œ ์ž…๋ ฅ๋ณ€์ˆ˜ ๋ฐ ๊ฐ€์ •์‚ฌํ•ญ

๋ณธ ์—ฐ๊ตฌ์—์„œ๋Š” ์œ„์—์„œ ์ œ์•ˆ๋œ ๋ชจ๋‹ˆํ„ฐ๋ง ๊ธฐ๋ฐ˜ ์œ ์ง€๊ด€๋ฆฌ๋น„์šฉ ๋ถ„์„ ๋ชจ๋ธ์„ ํ˜„์žฌ ๊ณต์šฉ๋˜๊ณ  ์žˆ๋Š” ์˜์ข…๋Œ€๊ต ์™•๋ณต 4์ฐจ์„  300m ๊ฐ•๊ต์˜ ๊ฐ•๋ฐ•์Šค ๊ฑฐ๋”(Fig. 8)์— ์ ์šฉํ•˜์˜€๋‹ค. ์ ์šฉ๋œ ์˜์ข…๋Œ€๊ต ๊ฐ•๋ฐ•์Šค ๊ฑฐ๋”์˜ ๋ฉด์ ์€ 600m2์ด๊ณ , ํ”ผ๋กœ๊ท ์—ด ๋ชจ๋‹ˆํ„ฐ๋ง์šฉ ์„ผ์„œ๋…ธ๋“œ์— ๋Œ€ํ•œ ์ •๋ณด ๋ฐ ๊ฐ€์ •์‚ฌํ•ญ์€ Table 1๊ณผ ๊ฐ™๋‹ค. Table 1๋กœ๋ถ€ํ„ฐ ์Šค๋งˆํŠธ ๋ชจ๋‹ˆํ„ฐ๋ง ๊ธฐ์ˆ  ๊ธฐ๋ฐ˜ ์ด ์œ ์ง€๊ด€๋ฆฌ๋น„์šฉ ์‚ฐ์ • Eq. (15)์˜ ์ดˆ๊ธฐ(t0) ์„ผ์„œ ์„ค์น˜๋น„์šฉ(CSEN(t0):326,000won+345,000won x 60EA)์„ ๊ณ„์‚ฐํ•œ๋‹ค. ๋˜ํ•œ, ์˜์ข…๋Œ€๊ต ๊ฐ•์žฌ๊ฑฐ๋” ํ”ผ๋กœ๊ท ์—ด ๋ชจ๋‹ˆํ„ฐ๋ง ๊ธฐ์ˆ ์„ ๋ฐ˜์˜ํ•˜์˜€๊ณ , ์„ผ์„œ๋…ธ๋“œ์˜ ์ ๊ฒ€์˜ค์ฐจ(ฯƒ2)๋Š” 0.05 (์ •ํ™•๋„ 95%)๋กœ ๊ฐ€์ •ํ•˜์˜€๋‹ค. ์˜์ข…๋Œ€๊ต ๊ฐ•๋ฐ•์Šค ๊ฑฐ๋”์˜ ์„ผ์„œ๋…ธ๋“œ ๋ถ€์ฐฉ์œ„์น˜๋Š” Fig. 9์™€ ๊ฐ™๋‹ค. ์„ผ์„œ๋…ธ๋“œ ์‚ฌ์šฉ ์‹œ ์ง์ ‘์ธ๊ฑด๋น„๋Š” ๊ธฐ์กด ์œ ์ง€๊ด€๋ฆฌ ์ง์ ‘์ธ๊ฑด๋น„์˜ 25%๋กœ ๊ฐ€์ •ํ•˜์˜€๊ณ , ์•ˆ์ „์ ๊ฒ€ ๋ฐ ์ •๋ฐ€์•ˆ์ „์ง„๋‹จ ๋Œ€๊ฐ€(๋น„์šฉ์‚ฐ์ •) ๊ธฐ์ค€(๊ตญํ† ๊ตํ†ต๋ถ€ ๊ณ ์‹œ(2016.12.06. ๊ฐœ์ •))์„ ์ฐธ๊ณ ํ•˜์—ฌ ๊ธฐ์กด ๋ฐ ์„ผ์„œ๋…ธ๋“œ ์‚ฌ์šฉ ์‹œ ๊ฐ๊ฐ์˜ 1ํšŒ ์ ๊ฒ€ ๋น„์šฉ(์ •๊ธฐ์ ๊ฒ€๋น„์šฉ, ์ •๋ฐ€์ ๊ฒ€๋น„์šฉ, ์ •๋ฐ€์•ˆ์ „์ง„๋‹จ๋น„์šฉ)์€ Table 2์™€ ๊ฐ™์ด ๊ฐ€์ •ํ•˜์˜€๋‹ค(KAIA, 2013; Lim et al., 2016).

Figure_KSCE_38_4_01_F8.jpg
Fig. 8.

Overview of Youngjong Grand Bridge

Table 1. Assumption of Sensor Node

http://static.apub.kr/journalsite/sites/ksce/2018-038-04/N0110380401/Figure_KSCE_38_4_01_T1.jpg

Figure_KSCE_38_4_01_F9.jpg
Fig. 9.

The Installation Locations of the Sensor Node on Youngjong Grand Bridge

Table 2. A Comparison between Inspection of Existing Method and Inspection with Sensor Node

http://static.apub.kr/journalsite/sites/ksce/2018-038-04/N0110380401/Figure_KSCE_38_4_01_T2.jpg

4.2 ๋Œ€์ƒ ๊ต๋Ÿ‰ ๋ถ€์žฌ์˜ ์ ์šฉ๋œ ๋ณด์ˆ˜โ€ง๋ณด๊ฐ• ๊ณต๋ฒ•

๊ฐ•์žฌ ๊ฑฐ๋”์˜ ๊ท ์—ด์€ ์‘๋ ฅ์ง‘์ค‘๋ถ€ ๋ฐ ์šฉ์ ‘๊ฒฐํ•จ๋ถ€ ๋“ฑ์—์„œ ์†์ƒ์ด ๋ˆ„์ ๋˜์–ด ํ”ผ๋กœ ๊ท ์—ด๋กœ ๋ฐœ์ „ํ•˜๊ฑฐ๋‚˜ ๋ฉด์™ธ๋ณ€ํ˜• ๋ฐ 2์ฐจ ์‘๋ ฅ ๋“ฑ์— ์˜ํ•ด์„œ๋„ ๋ฐœ์ƒ๋œ๋‹ค. ํ•œํŽธ, ํ•œ๊ตญ๊ฑด์„ค๊ธฐ์ˆ ์—ฐ๊ตฌ์› ๊ต๋Ÿ‰๊ด€๋ฆฌ์‹œ์Šคํ…œ(BMS)์ƒ์˜ ๋ณด์ˆ˜โ€ง๋ณด๊ฐ•๊ธฐ๋ก DB๋กœ ๋ถ€ํ„ฐ ๊ฐ ๊ต๋Ÿ‰ ๋Œ€ํ‘œ ๋ถ€์žฌ๋ณ„, ๊ณต๋ฒ•๋ณ„ ๋ฐœ์ƒ ๋นˆ๋„๋ถ„์„ ๊ฒฐ๊ณผ๋ฅผ ํ†ตํ•ด์„œ ์‚ฐ์ถœํ•œ ๋ณด์ˆ˜โ€ง๋ณด๊ฐ•๋ฆฌ์ŠคํŠธ์— ๋Œ€ํ•ด์„œ ์ƒํƒœ๋“ฑ๊ธ‰ํ–ฅ์ƒ๋ฐ์ดํ„ฐ์™€ ์ „๋ฌธ๊ฐ€ ์˜๊ฒฌ์„ ๋ฐ”ํƒ•์œผ๋กœ ์ƒํƒœ๋“ฑ๊ธ‰ํ–ฅ์ƒ ๋ชจ๋ธ์„ ๋งŒ๋“ค์—ˆ๋‹ค. ์˜ˆ๋ฅผ ๋“ค์–ด, ํ”ผ๋กœ๊ท ์—ด ์†์ƒ์— ์ ์šฉ ๊ฐ€๋Šฅํ•œ ๋ณด์ˆ˜โ€ง๋ณด๊ฐ• ๊ณต๋ฒ•์œผ๋กœ ์šฉ์ ‘๋ณด์ˆ˜, ์™ธ๋ถ€๊ธด์žฅ, ๋ณด๊ฐ•์žฌ ๋ง๋Œ ๊ณต๋ฒ•, ๊ท ์—ด๋ฐฉ์ง€๊ณต๋ฒ•, ๊ฑฐ๋”์ฆ์„ค, ๊ฑฐ๋”๊ต์ฒด์™€ ๊ฐ™์ด 6๊ฐ€์ง€ ๋Œ€ํ‘œ ๊ณต๋ฒ•์„ ์ •์˜ํ•˜๊ณ , ๊ฐ ๊ณต๋ฒ•๋“ค์˜ ๋“ฑ๊ธ‰๋ณ„ ์ƒํƒœํ–ฅ์ƒ์ •๋„์™€ ๋ณด์ˆ˜โ€ง๋ณด๊ฐ• ๊ณต์‚ฌ๋‚ด์—ญ์„œ๋ฅผ ์ฐธ๊ณ ํ•œ ๊ณต๋ฒ•๋‹จ๊ฐ€๋ฅผ ์—ฐ๊ณ„ํ•˜์˜€๋‹ค. ๋จผ์ € BMS์ƒ์˜ ๊ธฐ์กด ๊ณต์‚ฌ๋‚ด์—ญ์„œ๋“ค์˜ ๊ณต๋ฒ•๋ณ„ ์ ์šฉ๋ณด์ˆ˜๋ฌผ๋Ÿ‰ ๋ฐ ๋ณด์ˆ˜โ€ง๋ณด๊ฐ•๋น„์šฉ ์‹ค์ ์„ ํ†ตํ•ด ๋ถ€์žฌ๋ณ„ ์ ์šฉ ๊ณต๋ฒ•์˜ ์ƒํƒœ ๋“ฑ๊ธ‰๋ณ„ ๋ณด์ˆ˜โ€ง๋ณด๊ฐ• ๋‹จ๊ฐ€(๋ณด์ˆ˜โ€ง๋ณด๊ฐ•๋น„์šฉ/์ ์šฉ๋ณด์ˆ˜๋ฌผ๋Ÿ‰)์™€ ๋“ฑ๊ธ‰๋ณ„ ํ‰๊ท  ๋ณด์ˆ˜์œจ(๋ณด์ˆ˜๋ฉด์ /์ „์ฒด๋ฉด์ )์„ ๊ณ„์‚ฐํ•˜๊ณ , ์œ„์—์„œ ์–ธ๊ธ‰ํ•œ ํ”ผ๋กœ๊ท ์—ด ์†์ƒ ๋ฐœ์ƒ์— ๋”ฐ๋ฅธ ์ ์šฉ ๊ฐ€๋Šฅํ•œ 6๊ฐ€์ง€ ๋Œ€ํ‘œ ๋ณด์ˆ˜โ€ง๋ณด๊ฐ• ๊ณต๋ฒ•๋“ค์˜ ๋“ฑ๊ธ‰๋ณ„ ๋ˆ„์  ๋ณด์ˆ˜โ€ง๋ณด๊ฐ•๋น„์šฉ์„ ์‚ฐ์ •ํ•˜์˜€๋‹ค. Fig. 10์€ ๋ฉด์ ์ด 600m2(์ „์ฒด๋ฉด์ )์ธ ๊ฐ•๋ฐ•์Šค ๊ฑฐ๋”์˜ ๋“ฑ๊ธ‰๋ณ„ ๋ณด์ˆ˜โ€ง๋ณด๊ฐ•๋น„์šฉ(๋‹จ๊ฐ€์™€ ๋ณด์ˆ˜์œจ๊ณผ ์ „์ฒด๋ฉด์ (600m2)์˜ ๊ณฑ)์„ ๋‚˜ํƒ€๋‚ด๊ณ , ๊ฐ ๋“ฑ๊ธ‰๋ณ„ ๋ˆ„์  ๋ณด์ˆ˜โ€ง๋ณด๊ฐ•๋น„์šฉ์— ๋Œ€ํ•œ ํšŒ๊ท€๋ถ„์„์— ๋”ฐ๋ฅธ 2์ฐจ ๊ณก์„  ๊ฒฝํ–ฅ์„ ๋‚˜ํƒ€๋‚ธ๋‹ค. ์ด๋•Œ, ๋‚ฎ์€ ๋“ฑ๊ธ‰(C~D)์œผ๋กœ ๊ฐˆ์ˆ˜๋ก ๋น„์šฉ์ด ์ฆ๊ฐ€ํ•˜๋Š” ๊ฒƒ์„ ๋ณผ ์ˆ˜ ์žˆ๋Š”๋ฐ ์ด๋Š” ์œ„์—์„œ ์–ธ๊ธ‰ํ•œ 6๊ฐ€์ง€ ๊ณต๋ฒ•๋“ค ์ค‘ ๋‚ฎ์€ ๋“ฑ๊ธ‰(C~D)์—์„œ๋Š” ๊ฑฐ๋” ์ฆ์„ค(๋˜๋Š” ๊ต์ฒด)๊ณผ ๊ฐ™์€ ๋‹จ๊ฐ€๊ฐ€ ๋†’์€ ๊ณต๋ฒ•๋“ค์˜ ์ ์šฉ์— ๋”ฐ๋ฅธ ๋ณด์ˆ˜์œจ์ด ๋†’๊ธฐ ๋•Œ๋ฌธ์ด๋‹ค(Jung et al., 2009; MLTMA, 2012; Sun et al., 2016).

Figure_KSCE_38_4_01_F10.jpg
Fig. 10.

Cost of Maintenance by Grade : Steel Box Girder (600m2)

4.3 ์œ ์ง€๊ด€๋ฆฌ๋น„์šฉ ์‚ฐ์ •

๋ณธ ์—ฐ๊ตฌ์—์„œ ์œ ์ง€๊ด€๋ฆฌ๋น„์šฉ์€ ๋ชจ๋‹ˆํ„ฐ๋ง ์—…๋ฐ์ดํŠธ ์œ ๋ฌด์— ๋”ฐ๋ผ ์œ ์ง€๊ด€๋ฆฌ ์‹œ๋‚˜๋ฆฌ์˜ค ๋ฐ ๋ณด์ˆ˜โ€ง๋ณด๊ฐ• ๊ณต๋ฒ• ๋น„์šฉ์„ ์—ฐ๊ณ„ํ•˜์—ฌ ์‚ฐ์ถœํ•˜์˜€๊ณ , ๊ธฐ์กด ๋Œ€๋น„ ๋ชจ๋‹ˆํ„ฐ๋ง ์—…๋ฐ์ดํŠธ ์‹œ ์ดˆ๊ธฐ ์†์ƒ์œ ํ˜• ๊ฒ€์ธก์„ ํ†ตํ•œ ๋Œ€์ƒ ๊ต๋Ÿ‰ ๋ถ€์žฌ๋กœ์˜ ์ƒํƒœ์˜ˆ์ธก๋ชจ๋ธ ์—…๋ฐ์ดํŠธ์— ๋”ฐ๋ผ ๋ฐœ์ƒ ๊ฐ€๋Šฅํ•œ ๋Œ€ํ‘œ ์œ ์ง€๊ด€๋ฆฌ ์‹œ๋‚˜๋ฆฌ์˜ค๋ณ„(Case 1~3) ๋น„์šฉ ํšจ์œจ์„ฑ ์ธก๋ฉด์—์„œ์˜ ์œ ๋ฆฌํ•จ์„ ์ •๋Ÿ‰์ ์œผ๋กœ ๊ฒ€์ฆํ•˜์˜€๋‹ค. ๋ชจ๋‹ˆํ„ฐ๋ง ๊ธฐ๋ฐ˜ ๋ฒ ์ด์ง€์•ˆ ์—…๋ฐ์ดํŠธ ์‹œ์ ์€ Table 2์—์„œ ์ œ์‹œํ•œ ์ •๋ฐ€์•ˆ์ „์ง„๋‹จ ์‹œ๊ธฐ์™€ ๊ฐ™์€ 5๋…„์œผ๋กœ ๊ณ„์‚ฐํ•˜์˜€๋Š”๋ฐ, ์ด๋Š” ์„ผ์„œ๋…ธ๋“œ ๋ถ€์ฐฉ์œ„์น˜(Fig. 9)์™€ ๊ฐ™์€ ์šฉ์ ‘๋ถ€์˜ ํ”ผ๋กœ๊ท ์—ด์ด ์ •๋ฐ€์•ˆ์ „์ง„๋‹จ์ด ํ•„์š”ํ•œ ์‹œ๊ธฐ๋™์•ˆ ๋ฐœ์ƒํ•  ๊ฐ€๋Šฅ์„ฑ์ด ์กด์žฌํ•˜๊ธฐ ๋•Œ๋ฌธ์ด๋‹ค(Lim et al., 2016). ์„ผ์„œ๋…ธ๋“œ์˜ ์ ๊ฒ€์˜ค์ฐจ(ฯƒ2)๋Š” 0.05 (์ •ํ™•๋„ 95%)๋กœ ๊ฐ€์ •ํ•˜๋ฉฐ, ์„ผ์„œ๋…ธ๋“œ์˜ ์ดˆ๊ธฐ๋น„์šฉ์€ Table 1์˜ ์ •๋ณด๋ฅผ, ๊ธฐ์กด ๋ฐ ์„ผ์„œ๋…ธ๋“œ ๊ธฐ๋ฐ˜ 1ํšŒ ์ ๊ฒ€๋น„์šฉ ๋ฐ ์ ๊ฒ€ ์‹œ์ ์€ Table 2์˜ ์ •๋ณด๋ฅผ ํ™œ์šฉํ•˜์˜€๊ณ , ํ• ์ธ์œจ์€ 3%๋กœ ๊ฐ€์ •ํ•˜์˜€๋‹ค.

4.3.1 Case 1 : ์—…๋ฐ์ดํŠธ ํ‰๊ท  ์ƒํƒœ(ฮผ3) = ๊ธฐ์กด ํ‰๊ท  ์ƒํƒœ(ฮผ1)

๋ชจ๋‹ˆํ„ฐ๋ง ๊ฒฐ๊ณผ ๋ฒ ์ด์ง€์•ˆ ์—…๋ฐ์ดํŠธ ์‹œ์ (5๋…„)์—์„œ ํ‰๊ท  ์ƒํƒœ๊ฐ€ ๊ธฐ์กด ํ‰๊ท  ์ƒํƒœ์™€ ๊ฐ™๋‹ค๋ฉด, ๋ณด์ˆ˜โ€ง๋ณด๊ฐ• ๊ณต๋ฒ• ์ ์šฉ ์‹œ์ ์€ ๊ธฐ์กด ํ‰๊ท  ์ƒํƒœ์˜ˆ์ธก๋ชจ๋ธ(ฮผ1)์ด B~C๋“ฑ๊ธ‰ ์‚ฌ์ด(0.7)์— ๋„๋‹ฌํ•˜๋Š” ์‹œ์ (14๋…„)์œผ๋กœ ์‚ฐ์ •ํ•˜์˜€๋Š”๋ฐ, ์ด๋Š” 1995~2016๋…„์˜ BMS์ƒ ๋ณด์ˆ˜โ€ง๋ณด๊ฐ•๊ธฐ๋ก ๋ฐ์ดํ„ฐ ๋ถ„์„ ๊ฒฐ๊ณผ ST BOX๊ฑฐ๋”์˜ ๊ฒฝ์šฐ, B์™€ C๋“ฑ๊ธ‰์—์„œ์˜ ๋ณด์ˆ˜โ€ง๋ณด๊ฐ• ์กฐ์น˜ ๋นˆ๋„๊ฐ€ ๊ฐ€์žฅ ๋†’๊ฒŒ ์‚ฐ์ถœ๋๊ธฐ ๋•Œ๋ฌธ์ด๋‹ค. ๊ธฐ์กด ์ƒํƒœ์˜ˆ์ธก๋ชจ๋ธ์— ๋Œ€ํ•œ ์ •๋ณด๋งŒ ์žˆ๋Š” ๊ฒฝ์šฐ, Fig. 11๊ณผ ๊ฐ™์ด ์‹ค์ œ ๋Œ€์ƒ ๋ถ€์žฌ์˜ ํ‰๊ท  ์ƒํƒœ๋Š” ์•Œ ์ˆ˜ ์žˆ์œผ๋‚˜, ๊ฐ์†Œ๋œ ๋ถˆํ™•์‹ค์„ฑ(ฯƒ3)์€ ์˜ˆ์ธกํ•  ์ˆ˜ ์—†์œผ๋ฏ€๋กœ ๊ธฐ์กด ์ƒํƒœ์˜ˆ์ธก๋ชจ๋ธ์˜ ๋ถˆํ™•์‹ค์„ฑ(ฯƒ1=0.0041)์„ ๊ณ ๋ คํ•œ๋‹ค. B~C๋“ฑ๊ธ‰ ์‚ฌ์ด(0.7)์— ๋„๋‹ฌํ•˜๋Š” ์‹œ์ (14๋…„)์—์„œ ๊ธฐ์กด ์ƒํƒœ์˜ ๋ณด์ˆ˜โ€ง๋ณด๊ฐ• ์ ์šฉ ํ™•๋ฅ (PMAI,EXI(ti))๊ณผ ๋งค์นญ๋˜๋Š” ๋ณด์ˆ˜โ€ง๋ณด๊ฐ•๊ณต๋ฒ• ๋น„์šฉ(CMAI,EXI(ti))์˜ ๊ณฑ์œผ๋กœ 1ํšŒ ๋ณด์ˆ˜โ€ง๋ณด๊ฐ•๋น„์šฉ์„ ์‚ฐ์ถœํ•˜์˜€๋‹ค.

Figure_KSCE_38_4_01_F11.jpg
Fig. 11.

Case 1 : Existing Deterioration Model and Cost of Maintenance by Grade

Fig. 12๋Š” ๋ชจ๋‹ˆํ„ฐ๋ง ๊ธฐ๋ฐ˜ ๋ฒ ์ด์ง€์•ˆ ์—…๋ฐ์ดํŠธ๋ฅผ ์ ์šฉํ•œ ์ƒํƒœ์˜ˆ์ธก๋ชจ๋ธ์„ ๋‚˜ํƒ€๋‚ธ๋‹ค. 5๋…„์—์„œ ์—…๋ฐ์ดํŠธ ์ „ ๊ฐ•๋ฐ•์Šค ๊ฑฐ๋” ์ƒํƒœ์˜ˆ์ธก๋ชจ๋ธ์„ ํ†ตํ•ด ์•Œ๊ณ  ์žˆ๋Š” ์ •๋ณด(ฮผ1=0.8955, ฯƒ1=0.0205)์™€ ์„ผ์„œ๋…ธ๋“œ๋ฅผ ํ†ตํ•ด ์–ป์€ ์ •๋ณด(ฮผ2=0.8955, ฯƒ2=0.05)๋ฅผ Eq. (11)์— ๋Œ€์ž…ํ•˜์—ฌ ๋Œ€์ƒ ๊ต๋Ÿ‰ ๋ถ€์žฌ์˜ ๊ฐฑ์‹ ๋œ ์ƒํƒœ์˜ˆ์ธก๋ชจ๋ธ(ฮผ3=0.8955, ฯƒ3=0.19)์„ ์‚ฐ์ถœํ•˜๊ณ , B~C๋“ฑ๊ธ‰ ์‚ฌ์ด(0.7)์— ๋„๋‹ฌํ•  ์‹œ(14๋…„)์˜ ๋ณด์ˆ˜โ€ง๋ณด๊ฐ•๊ณต๋ฒ• ์ ์šฉํ™•๋ฅ  ๋ฐ ๋น„์šฉ์„ ๊ณ ๋ คํ•œ๋‹ค. ์œ„์—์„œ ์–ธ๊ธ‰ํ•œ ๋ฐ”์™€ ๊ฐ™์ด ๋ชจ๋‹ˆํ„ฐ๋ง์„ ํ†ตํ•ด ๊ธฐ์กด ๋ถˆํ™•์‹ค์„ฑ(ฯƒ1)์— ๋น„ํ•ด ์—…๋ฐ์ดํŠธ ๊ธฐ๋ฐ˜ ๊ฐ์†Œ๋œ ๋ถˆํ™•์‹ค์„ฑ(ฯƒ3)์„ ๊ณ ๋ คํ•˜๋ฉด B~C๋“ฑ๊ธ‰ ์‚ฌ์ด(0.7)์— ๋„๋‹ฌํ•˜๋Š” ์‹œ์ (14๋…„)์—์„œ ์—…๋ฐ์ดํŠธ ์ƒํƒœ๋ชจ๋ธ์˜ ํ™•๋ฅ ๋ถ„ํฌ๋ฅผ ์•Œ๊ฒŒ ๋œ๋‹ค. B~C๋“ฑ๊ธ‰ ์‚ฌ์ด(0.7)์— ๋„๋‹ฌ์‹œ์ (14๋…„)์—์„œ ์—…๋ฐ์ดํŠธ ์ƒํƒœ์˜ ๋ณด์ˆ˜โ€ง๋ณด๊ฐ• ์ ์šฉ ํ™•๋ฅ (PMAI,UP(ti))๊ณผ ๋งค์นญ๋˜๋Š” ๋ณด์ˆ˜โ€ง๋ณด๊ฐ•๊ณต๋ฒ• ๋น„์šฉ(CMAI,UP(ti))์˜ ๊ณฑ์œผ๋กœ 1ํšŒ ํ•ด๋‹น ๋“ฑ๊ธ‰(0.7)์—์„œ์˜ ๋ณด์ˆ˜โ€ง๋ณด๊ฐ•๋น„์šฉ์„ ์‚ฐ์ถœํ•˜์˜€๋‹ค.

Figure_KSCE_38_4_01_F12.jpg
Fig. 12.

Case 1 : Updating Deterioration Model and Cost of Maintenance by Grade

Table 3์˜ ๊ฒฐ๊ณผ, ๋ชจ๋‹ˆํ„ฐ๋ง ์—…๋ฐ์ดํŠธ ์ „๊ณผ ํ›„์˜ 14๋…„์—์„œ ๊ฐ๊ฐ์˜ ์ด ์œ ์ง€๊ด€๋ฆฌ๋น„์šฉ์„ Eqs. (15) and (16)์— ๊ทผ๊ฑฐํ•˜์—ฌ ์‚ฐ์ถœํ•˜์˜€๋Š”๋ฐ ์•ฝ 9%์˜ ๋น„์šฉ ์ ˆ๊ฐ ํšจ๊ณผ๊ฐ€ ๋ฐœ์ƒ๋จ์„ ์•Œ ์ˆ˜ ์žˆ๋‹ค. ์—…๋ฐ์ดํŠธ ํ‰๊ท  ์ƒํƒœ(ฮผ3)๊ฐ€ ๊ธฐ์กด ์˜ˆ์ธก ์ƒํƒœ(ฮผ1)์™€ ๊ฐ™์€ ๊ฒฝ์šฐ์— ์ด๋Ÿฌํ•œ ์œ ์ง€๊ด€๋ฆฌ๋น„์šฉ ์ ˆ๊ฐ(-7,800์ฒœ์›)์ด ๋ฐœ์ƒํ•œ ์›์ธ์€ ๋‹ค์Œ๊ณผ ๊ฐ™๋‹ค.

Table 3. Case 1 : Comparison between Total Maintenance Cost of Existing and Updating Scenario at 14 Years

http://static.apub.kr/journalsite/sites/ksce/2018-038-04/N0110380401/Figure_KSCE_38_4_01_T3.jpg

์„ผ์„œ๋…ธ๋“œ ๊ธฐ๋ฐ˜ ๋ชจ๋‹ˆํ„ฐ๋ง ์‹œ์ (5๋…„)์—์„œ ๋ฒ ์ด์ง€์•ˆ ์—…๋ฐ์ดํŠธ๋ฅผ ํ†ตํ•ด ๊ธฐ์กด ์ƒํƒœ๊ฐ€ ๊ฐ–๋Š” ๋ถˆํ™•์‹ค์„ฑ(ฯƒ1) ๋Œ€๋น„ ๋Œ€์ƒ ๊ตฌ์กฐ๋ฌผ์˜ ๋ถˆํ™•์‹ค์„ฑ(ฯƒ3)์ด ๊ฐ์†Œ๋˜์–ด ์—…๋ฐ์ดํŠธ ์ƒํƒœ๊ฐ€ ๋ชฉํ‘œํ•œ ๊ด€๋ฆฌ์ˆ˜์ค€(B~C๋“ฑ๊ธ‰ ์‚ฌ์ด(0.7))์— ๋„๋‹ฌํ•˜๋Š” ์‹œ๊ธฐ(14๋…„)์—์„œ ํ•ด๋‹น๋˜๋Š” ๋ณด์ˆ˜โ€ง๋ณด๊ฐ• ๋น„์šฉ์ด ๊ฐ์†Œํ•˜์—ฌ ๋ณด๋‹ค ์ •ํ™•ํžˆ ์˜ˆ์ธกํ•  ์ˆ˜ ์žˆ๋‹ค. ์ฆ‰, ๋ชจ๋‹ˆํ„ฐ๋ง ๊ธฐ๋ฐ˜ ํŠน์ • ๋Œ€์ƒ ๊ตฌ์กฐ๋ฌผ์˜ ๋ถˆํ™•์‹ค์„ฑ(ฯƒ3)์ด ๊ฐ์†Œ๋˜๋ฉด ๊ธฐ์กด ์ƒํƒœ์˜ ๋ถˆํ™•์‹ค์„ฑ(ฯƒ1)์— ๋น„ํ•ด, B(0.8)~C(0.6)๋“ฑ๊ธ‰ ๋ณด์ˆ˜โ€ง๋ณด๊ฐ• ๋น„์šฉ ๋ฉด์ ์— ํ•ด๋‹นํ•˜๋Š” ํ™•๋ฅ ๋ถ„ํฌ์˜ ๋ถˆํ™•์‹ค์„ฑ์ด ๊ฐ์†Œํ•˜์—ฌ ๋ชฉํ‘œํ•œ ์œ ์ง€๊ด€๋ฆฌ๋น„์šฉ ์‚ฐ์ถœ์‹œ์ (14๋…„)์—์„œ์˜ 1ํšŒ ๋ณด์ˆ˜โ€ง๋ณด๊ฐ• ๋น„์šฉ์„ ์ค„์ผ ์ˆ˜ ์žˆ๋‹ค.

4.3.2 Case 2 : ์—…๋ฐ์ดํŠธ ํ‰๊ท  ์ƒํƒœ(ฮผ3) > ๊ธฐ์กด ํ‰๊ท  ์ƒํƒœ(ฮผ1)

๋ชจ๋‹ˆํ„ฐ๋ง ๊ฒฐ๊ณผ ๋ฒ ์ด์ง€์•ˆ ์—…๋ฐ์ดํŠธ ์‹œ์ (5๋…„)์—์„œ ์—…๋ฐ์ดํŠธ ์—ดํ™”๋ชจ๋ธ์˜ ํ‰๊ท  ๊ธฐ์šธ๊ธฐ๊ฐ€ ๊ธฐ์กด ์ƒํƒœ์˜ˆ์ธก๋ชจ๋ธ์˜ ์ƒ๋ถ€๊ฒฝ๊ณ„์น˜์˜ ๊ธฐ์šธ๊ธฐ(-0.017)์™€ ๊ฐ™์€ ๊ฒฝํ–ฅ์„ ๋”ฐ๋ฅธ๋‹ค๋Š” ์‚ฌ์‹ค์„ ์•Œ์•˜๋‹ค๊ณ  ๊ฐ€์ •ํ•˜๋ฉด, ํŠน์ • ๋Œ€์ƒ ๊ต๋Ÿ‰ ๊ฐ•๋ฐ•์Šค ๊ฑฐ๋”์˜ ์ƒํƒœ๋Š” ๊ธฐ์กด ์ƒํƒœ์˜ˆ์ธก๋ชจ๋ธ์˜ B~C๋“ฑ๊ธ‰(0.7) ๋„๋‹ฌ์‹œ์ (14๋…„)์—์„œ B (0.8)๋“ฑ๊ธ‰ ๊ทผ์ฒ˜์— ์กด์žฌํ•  ํ™•๋ฅ ์ด ์ปค์ง€๊ฒŒ ๋œ๋‹ค. ๊ธฐ์กด ์ƒํƒœ์˜ˆ์ธก๋ชจ๋ธ์— ๋Œ€ํ•œ ์ •๋ณด๋งŒ ์•Œ๊ณ  ์žˆ๋Š” ๊ฒฝ์šฐ, Fig. 13๊ณผ ๊ฐ™์ด B~C๋“ฑ๊ธ‰(0.7) ๋„๋‹ฌ์‹œ์ (14๋…„)์—์„œ ํ”ผ๋กœ ๊ท ์—ด์— ๋”ฐ๋ฅธ ๊ฐ•๋ฐ•์Šค ๊ฑฐ๋”์˜ ์ƒํƒœ๋ฅผ ์˜ˆ์ธกํ•  ์ˆ˜ ์—†์„ ๊ฒƒ์ด๋‹ค. ์ฆ‰, ๋ณธ ๋…ผ๋ฌธ์—์„œ ์–ธ๊ธ‰ํ•œ ํ”ผ๋กœ ๊ท ์—ด๊ณผ ๊ฐ™์ด ์—ดํ™” ์ดˆ๊ธฐ์— ์˜ˆ์ธก์ด ์–ด๋ ค์šด ์†์ƒ์œ ํ˜• ์‹๋ณ„์— ๋”ฐ๋ฅธ ๋ณด์ˆ˜โ€ง๋ณด๊ฐ•์‹œ๊ธฐ ํŒ๋‹จ๊ณผ ๊ทธ์— ๋”ฐ๋ฅธ ๋ณด์ˆ˜โ€ง๋ณด๊ฐ• ๊ณต๋ฒ• ์ ์šฉ์„ฑ์ด ๋–จ์–ด์ง€๋ฏ€๋กœ ๋ถˆํ•„์š”ํ•œ ์œ ์ง€๋ณด์ˆ˜๋น„์šฉ์ด ์‚ฐ์ •๋  ์ˆ˜ ์žˆ๋‹ค.

Figure_KSCE_38_4_01_F13.jpg
Fig. 13.

Case 2 : Existing Deterioration Model and Cost of Maintenance by Grade

Fig. 14๋Š” Eq. (11)์„ ์ด์šฉํ•˜์—ฌ ๋ชจ๋‹ˆํ„ฐ๋ง ๊ธฐ๋ฐ˜ ๋ฒ ์ด์ง€์•ˆ ์—…๋ฐ์ดํŠธ๋ฅผ ํ†ตํ•ด ๋Œ€์ƒ ๊ต๋Ÿ‰ ๋ถ€์žฌ์˜ ๊ฐฑ์‹ ๋œ ์ƒํƒœ์˜ˆ์ธก๋ชจ๋ธ(ฮผ3, ฯƒ3)์„ ์‚ฐ์ถœํ•˜๊ณ , ์—…๋ฐ์ดํŠธ ์—ดํ™”๋ชจ๋ธ์ด ๋ชฉํ‘œ ๊ด€๋ฆฌ ์ˆ˜์ค€(0.7) ๋„๋‹ฌ ์‹œ(18๋…„)์˜ ๋ณด์ˆ˜โ€ง๋ณด๊ฐ•๊ณต๋ฒ• ์ ์šฉํ™•๋ฅ  ๋ฐ ๋น„์šฉ์„ ๊ณ ๋ คํ•œ๋‹ค. ์ฆ‰, 5๋…„์—์„œ ๋ฒ ์ด์ง€์•ˆ ์—…๋ฐ์ดํŠธ๋ฅผ ํ†ตํ•ด ์‚ฐ์ถœ๋œ ์ƒˆ๋กœ์šด ์—ดํ™”๋ชจ๋ธ ๊ธฐ๋ฐ˜ B~C๋“ฑ๊ธ‰(0.7) ๋„๋‹ฌ์‹œ์ (18๋…„)์—์„œ ์—…๋ฐ์ดํŠธ ์ƒํƒœ์˜ ํ™•๋ฅ ๋ถ„ํฌ๋ฅผ ์‚ฐ์ถœํ•˜๊ณ , B~C๋“ฑ๊ธ‰(0.7) ๋„๋‹ฌ์‹œ์ (18๋…„)์—์„œ์˜ ์—…๋ฐ์ดํŠธ ์ƒํƒœ์˜ ๋ณด์ˆ˜โ€ง๋ณด๊ฐ• ์ ์šฉ ํ™•๋ฅ (CMAI,UP(ti))๊ณผ ๋งค์นญ๋˜๋Š” ๋ณด์ˆ˜โ€ง๋ณด๊ฐ•๊ณต๋ฒ• ๋น„์šฉ(PMAI,UP(ti))์˜ ๊ณฑ์œผ๋กœ 1ํšŒ ํ•ด๋‹น ๋“ฑ๊ธ‰(0.7)์—์„œ์˜ ๋ณด์ˆ˜โ€ง๋ณด๊ฐ•๋น„์šฉ์„ ์‚ฐ์ถœํ•˜์˜€๋‹ค.

Figure_KSCE_38_4_01_F14.jpg
Fig. 14.

Case 2 : Updating Deterioration Model and Cost of Maintenance by Grade

Table 4์˜ ๊ฒฐ๊ณผ, ๋ชจ๋‹ˆํ„ฐ๋ง ์—…๋ฐ์ดํŠธ ์ „๊ณผ ํ›„์˜ 18๋…„์—์„œ ๊ฐ๊ฐ์˜ ์ด ์œ ์ง€๊ด€๋ฆฌ๋น„์šฉ์„ Eqs. (15) and (16)์— ๊ทผ๊ฑฐํ•˜์—ฌ ์‚ฐ์ถœํ•˜์˜€๋Š”๋ฐ ์•ฝ 19%์˜ ๋น„์šฉ ์ ˆ๊ฐ ํšจ๊ณผ๊ฐ€ ๋ฐœ์ƒ๋จ์„ ์•Œ ์ˆ˜ ์žˆ๋‹ค. ์—…๋ฐ์ดํŠธ ํ‰๊ท  ์ƒํƒœ(ฮผ3)๊ฐ€ ๊ธฐ์กด ์˜ˆ์ธก ์ƒํƒœ(ฮผ1)๋ณด๋‹ค ์ข‹์€ ๊ฒฝ์šฐ์— ์ด๋Ÿฌํ•œ ์œ ์ง€๊ด€๋ฆฌ๋น„์šฉ ์ ˆ๊ฐ(-21,900์ฒœ์›)์ด ๋ฐœ์ƒํ•œ ์›์ธ์€ ๋‹ค์Œ๊ณผ ๊ฐ™๋‹ค.

Table 4. Case 2 : Comparison between Total Maintenance Cost of Existing and Updating Scenario at 18 Years

http://static.apub.kr/journalsite/sites/ksce/2018-038-04/N0110380401/Figure_KSCE_38_4_01_T4.jpg

์„ผ์„œ๋…ธ๋“œ ๊ธฐ๋ฐ˜ ๋ชจ๋‹ˆํ„ฐ๋ง ์‹œ์ (5๋…„)์—์„œ ๋ฒ ์ด์ง€์•ˆ ์—…๋ฐ์ดํŠธ๋ฅผ ํ†ตํ•ด ๋Œ€์ƒ ๊ฐ•๋ฐ•์Šค ๊ฑฐ๋”์˜ ์ƒํƒœ๊ฐ€ ๊ธฐ์กด ์˜ˆ์ธก์น˜๋ณด๋‹ค ์–‘ํ˜ธํ•˜๋‹ค๊ณ  ํŒ๋‹จํ•˜๊ฒŒ ๋˜๊ณ , ์—…๋ฐ์ดํŠธ ์ƒํƒœ๊ฐ€ ๋ชฉํ‘œํ•œ ๊ด€๋ฆฌ์ˆ˜์ค€(B~C๋“ฑ๊ธ‰ ์‚ฌ์ด(0.7))์— ๋„๋‹ฌํ•˜๋Š” ์‹œ๊ธฐ(18๋…„)๋ฅผ ๋ณด๋‹ค ์ •ํ™•ํžˆ ์˜ˆ์ธกํ•  ์ˆ˜ ์žˆ๋‹ค. ๋ชจ๋‹ˆํ„ฐ๋ง ๊ธฐ๋ฐ˜ ํŠน์ • ๋Œ€์ƒ ๊ตฌ์กฐ๋ฌผ์˜ ์ƒํƒœ๋ฅผ ๋ณด๋‹ค ์ •ํ™•ํžˆ ์˜ˆ์ธกํ•  ์‹œ, ๊ธฐ์กด ์ƒํƒœ์˜ˆ์ธก๋ชจ๋ธ์˜ ์ •๋ณด๋งŒ์œผ๋กœ๋Š” ์‹ค์ œ ๊ฐ•๋ฐ•์Šค ๊ฑฐ๋”์˜ ์ƒํƒœ๋ฅผ ์˜ˆ์ธกํ•˜์ง€ ๋ชปํ•ด 18๋…„์—์„œ C๋“ฑ๊ธ‰์— ๊ฐ€๊นŒ์šด 1ํšŒ ๋ณด์ˆ˜โ€ง๋ณด๊ฐ• ๋น„์šฉ์ด ๋ฐœ์ƒํ•˜๋Š”๋ฐ ๋น„ํ•ด, ์—…๋ฐ์ดํŠธ ์ƒํƒœ์˜ˆ์ธก๋ชจ๋ธ์— ๋”ฐ๋ผ ์œ ์ง€๊ด€๋ฆฌ ์‹œ๋‚˜๋ฆฌ์˜ค ๊ณ„ํš์„ ์„ธ์šธ ๊ฒฝ์šฐ, 18๋…„์—์„œ B~C๋“ฑ๊ธ‰ ์‚ฌ์ด(0.7)์— ํ•ด๋‹นํ•˜๋Š” 1ํšŒ ๋ณด์ˆ˜โ€ง๋ณด๊ฐ• ๋น„์šฉ์ด ๋ฐœ์ƒ๋œ๋‹ค.

4.3.3 Case 3 : ์—…๋ฐ์ดํŠธ ํ‰๊ท  ์ƒํƒœ(ฮผ3) < ๊ธฐ์กด ํ‰๊ท  ์ƒํƒœ(ฮผ1)

๋ชจ๋‹ˆํ„ฐ๋ง ๊ฒฐ๊ณผ ๋ฒ ์ด์ง€์•ˆ ์—…๋ฐ์ดํŠธ ์‹œ์ (5๋…„)์—์„œ ์—…๋ฐ์ดํŠธ ์—ดํ™”๋ชจ๋ธ์˜ ํ‰๊ท  ๊ธฐ์šธ๊ธฐ๊ฐ€ ๊ธฐ์กด ์ƒํƒœ์˜ˆ์ธก๋ชจ๋ธ์˜ ํ•˜๋ถ€๊ฒฝ๊ณ„์น˜์˜ ๊ธฐ์šธ๊ธฐ(-0.025)์™€ ๊ฐ™์€ ๊ฒฝํ–ฅ์„ ๋”ฐ๋ฅธ๋‹ค๋Š” ์‚ฌ์‹ค์„ ์•Œ์•˜๋‹ค๊ณ  ๊ฐ€์ •ํ•˜๋ฉด, ๊ธฐ์กด ์ƒํƒœ์˜ˆ์ธก๋ชจ๋ธ์— ๋Œ€ํ•œ ์ •๋ณด๋งŒ ์žˆ๋Š” ๊ฒฝ์šฐ, Fig. 15์™€ ๊ฐ™์ด ์‹ค์ œ ๋Œ€์ƒ ๋ถ€์žฌ์˜ ์ƒํƒœ๋ฅผ ์˜ˆ์ธกํ•˜์ง€ ๋ชปํ•˜๋ฏ€๋กœ ๊ธฐ์กด์˜ B~C๋“ฑ๊ธ‰(0.7)์—์„œ ๋ฐœ์ƒํ•˜๋Š” ๋ณด์ˆ˜โ€ง๋ณด๊ฐ•๋น„์šฉ์ด ์•„๋‹Œ, C๋“ฑ๊ธ‰์— ๊ฐ€๊นŒ์šด ๋น„์šฉ์ด ์ ์šฉ๋œ๋‹ค.

Figure_KSCE_38_4_01_F15.jpg
Fig. 15.

Case 3 : Existing Deterioration Model and Cost of Maintenance by Grade

Fig. 16์€ ๋ชจ๋‹ˆํ„ฐ๋ง ๊ธฐ๋ฐ˜ ๋ฒ ์ด์ง€์•ˆ ์—…๋ฐ์ดํŠธ๋ฅผ ์ ์šฉํ•œ ์ƒํƒœ์˜ˆ์ธก๋ชจ๋ธ์— ๋”ฐ๋ฅธ ๋ฐœ์ƒ ๊ฐ€๋Šฅ ์‹œ๋‚˜๋ฆฌ์˜ค๋ฅผ ๋‚˜ํƒ€๋‚ธ๋‹ค. 5๋…„์—์„œ ์—…๋ฐ์ดํŠธ๋ฅผ ํ†ตํ•ด ๋Œ€์ƒ ๊ต๋Ÿ‰ ๋ถ€์žฌ์˜ ๊ฐฑ์‹ ๋œ ์ƒํƒœ์˜ˆ์ธก๋ชจ๋ธ(ฮผ3, ฯƒ3)์„ Eq. (11)์„ ์ด์šฉํ•˜์—ฌ ์‚ฐ์ถœํ•˜๊ณ , ์—…๋ฐ์ดํŠธ ์—ดํ™”๋ชจ๋ธ์ด ๋ชฉํ‘œํ•œ ๊ด€๋ฆฌ์ˆ˜์ค€(B~C๋“ฑ๊ธ‰ ์‚ฌ์ด(0.7))์— ๋„๋‹ฌํ•˜๋Š” ์‹œ๊ธฐ(12๋…„)์— ๋ณด์ˆ˜โ€ง๋ณด๊ฐ•๊ณต๋ฒ• ๋ฐ ๋น„์šฉ์„ ๊ณ ๋ คํ•œ๋‹ค. ์œ„์—์„œ ์–ธ๊ธ‰ํ•œ ๋ฐ”์™€ ๊ฐ™์ด ๋ชจ๋‹ˆํ„ฐ๋ง์„ ํ†ตํ•ด ๋Œ€์ƒ ๊ต๋Ÿ‰์˜ ๊ฐ•๋ฐ•์Šค ๊ฑฐ๋”์˜ ์—ดํ™”๊ฐ€ ๊ธฐ์กด ๋Œ€๋น„ ๋”์šฑ ๋น ๋ฅด๊ฒŒ ์ง„์ „๋œ๋‹ค๋Š” ์ •๋ณด๋ฅผ ์•Œ๊ฒŒ ๋˜๊ณ , ์ด์— ๋”ฐ๋ผ, ๋ณด๋‹ค ์ •ํ™•ํžˆ ๋ชฉํ‘œํ•œ ๊ด€๋ฆฌ์ˆ˜์ค€(B~C๋“ฑ๊ธ‰ ์‚ฌ์ด(0.7))์— ๋„๋‹ฌ์‹œ์ (12๋…„)์„ ์‚ฐ์ถœํ•˜๊ฒŒ ๋œ๋‹ค. 12๋…„์—์„œ ์—…๋ฐ์ดํŠธ ์—ดํ™”๋ชจ๋ธ์˜ ๋ณด์ˆ˜โ€ง๋ณด๊ฐ• ์ ์šฉ ํ™•๋ฅ (PMAI,UP(ti))๊ณผ ๋งค์นญ๋˜๋Š” ๋ณด์ˆ˜โ€ง๋ณด๊ฐ•๊ณต๋ฒ• ๋น„์šฉ(CMAI,UP(ti))์˜ ๊ณฑ์œผ๋กœ 1ํšŒ ํ•ด๋‹น ๋“ฑ๊ธ‰(0.7)์—์„œ์˜ ๋ณด์ˆ˜โ€ง๋ณด๊ฐ•๋น„์šฉ์„ ์‚ฐ์ถœํ•˜์˜€๋‹ค.

Figure_KSCE_38_4_01_F16.jpg
Fig. 16.

Case 3 : Updating Deterioration Model and Cost of Maintenance by Grade

Table 5์˜ ๊ฒฐ๊ณผ, ๋ชจ๋‹ˆํ„ฐ๋ง ์—…๋ฐ์ดํŠธ ์ „๊ณผ ํ›„์˜ 14๋…„์—์„œ ๊ฐ๊ฐ์˜ ์ด ์œ ์ง€๊ด€๋ฆฌ๋น„์šฉ์„ Eqs. (15) and (16)์— ๊ทผ๊ฑฐํ•˜์—ฌ ์‚ฐ์ถœํ•˜์˜€๋Š”๋ฐ ์•ฝ 22%์˜ ๋น„์šฉ ์ ˆ๊ฐ ํšจ๊ณผ๊ฐ€ ๋ฐœ์ƒ๋จ์„ ์•Œ ์ˆ˜ ์žˆ๋‹ค. ์—…๋ฐ์ดํŠธ ํ‰๊ท  ์ƒํƒœ(ฮผ3)๊ฐ€ ๊ธฐ์กด ์˜ˆ์ธก ์ƒํƒœ(ฮผ1)๋ณด๋‹ค ์ข‹์ง€ ์•Š์€ ๊ฒฝ์šฐ์— ์ด๋Ÿฌํ•œ ์œ ์ง€๊ด€๋ฆฌ๋น„์šฉ ์ ˆ๊ฐ(-22,000์ฒœ์›)์ด ๋ฐœ์ƒํ•œ ์›์ธ์€ ๋‹ค์Œ๊ณผ ๊ฐ™๋‹ค.

Table 5. Case 3 : Comparison between Total Maintenance Cost of Existing and Updating Scenario at 14 Years

http://static.apub.kr/journalsite/sites/ksce/2018-038-04/N0110380401/Figure_KSCE_38_4_01_T5.jpg

์„ผ์„œ๋…ธ๋“œ ๊ธฐ๋ฐ˜ ๋ชจ๋‹ˆํ„ฐ๋ง ์‹œ์ (5๋…„)์—์„œ ๋ฒ ์ด์ง€์•ˆ ์—…๋ฐ์ดํŠธ๋ฅผ ํ†ตํ•ด ๋Œ€์ƒ ๊ฐ•๋ฐ•์Šค ๊ฑฐ๋”์˜ ์ƒํƒœ๊ฐ€ ๊ธฐ์กด ์ƒํƒœ๋ณด๋‹ค ์–‘ํ˜ธํ•˜์ง€ ๋ชปํ•˜๋‹ค๊ณ  ํŒ๋‹จํ•˜๊ฒŒ ๋˜๊ณ , ์—…๋ฐ์ดํŠธ ์ƒํƒœ๊ฐ€ ๋ชฉํ‘œํ•œ ๊ด€๋ฆฌ์ˆ˜์ค€(B~C๋“ฑ๊ธ‰ ์‚ฌ์ด(0.7))์— ๋„๋‹ฌํ•˜๋Š” ์‹œ๊ธฐ(12๋…„)๋ฅผ ๋ณด๋‹ค ์ •ํ™•ํžˆ ์˜ˆ์ธกํ•  ์ˆ˜ ์žˆ๋‹ค. ๋ชจ๋‹ˆํ„ฐ๋ง ๊ธฐ๋ฐ˜ ๋Œ€์ƒ ๊ตฌ์กฐ๋ฌผ์˜ ์ƒํƒœ๋ฅผ ๋ณด๋‹ค ์ •ํ™•ํžˆ ์˜ˆ์ธกํ•  ์‹œ, ๊ธฐ์กด ์‹œ๋‚˜๋ฆฌ์˜ค์˜ ๊ฒฝ์šฐ ์‹ค์ œ ๊ฐ•๋ฐ•์Šค ๊ฑฐ๋”์˜ ์ƒํƒœ๋ฅผ ์˜ˆ์ธกํ•˜์ง€ ๋ชปํ•ด 14๋…„์—์„œ C๋“ฑ๊ธ‰์— ๊ฐ€๊นŒ์šด 1ํšŒ ๋ณด์ˆ˜โ€ง๋ณด๊ฐ• ๋น„์šฉ์ด ๋ฐœ์ƒํ•˜๋Š”๋ฐ ๋น„ํ•ด, ์—…๋ฐ์ดํŠธ ์ƒํƒœ ๋ชจ๋ธ ๊ธฐ๋ฐ˜ ์œ ์ง€๊ด€๋ฆฌ ์‹œ๋‚˜๋ฆฌ์˜ค๋ฅผ ๋”ฐ๋ฅผ ๊ฒฝ์šฐ 12๋…„์—์„œ B~C๋“ฑ๊ธ‰ ์‚ฌ์ด(0.7) ํ•ด๋‹นํ•˜๋Š” 1ํšŒ ๋ณด์ˆ˜โ€ง๋ณด๊ฐ• ๋น„์šฉ์ด ๋ฐœ์ƒ๋œ๋‹ค.

5. ๊ฒฐ ๋ก 

๋ณธ ๋…ผ๋ฌธ์—์„œ๋Š” ๊ต๋Ÿ‰ ์ƒํƒœ์˜ˆ์ธก๋ชจ๋ธ ๊ฐœ๋ฐœ๊ณผ ์„ผ์„œ๋…ธ๋“œ ๊ธฐ๋ฐ˜ ๋ชจ๋‹ˆํ„ฐ๋ง์„ ํ†ตํ•ด ์–ป์–ด์ง„ ๋ฐ์ดํ„ฐ ๊ฒฐ๊ณผ๋ฅผ ๋ฒ ์ด์ง€์•ˆ ๊ธฐ๋ฒ•์„ ๊ณ ๋ คํ•˜์—ฌ ํ™•๋ฅ ์ ์œผ๋กœ ๊ฒฐํ•ฉํ•œ ์—…๋ฐ์ดํŠธ๋œ ์ƒํƒœ์˜ˆ์ธก๋ชจ๋ธ ๊ธฐ๋ฐ˜ ์˜ˆ๋ฐฉ์œ ์ง€๊ด€๋ฆฌ๊ฐ€ ๊ธฐ์กด์˜ ๋ฐ˜๋ณตโ€ง์ฃผ๊ธฐ์ ์ธ ์ ๊ฒ€ ๊ธฐ๋ฐ˜ ํ˜„ํ–‰์œ ์ง€๊ด€๋ฆฌ ๋Œ€๋น„ ๋น„์šฉ ํšจ์œจ์„ฑ ์ธก๋ฉด์—์„œ ์œ ๋ฆฌํ•จ์„ ์ œ์•ˆํ•˜์˜€๋‹ค. ์‹ค์ œ ๋Œ€์ƒ ๊ต๋Ÿ‰(๋ถ€์žฌ)์˜ ๋ณด๋‹ค ์ •ํ™•ํ•œ ์ƒํƒœ๋ฅผ ์˜ˆ์ธกํ•˜์—ฌ ๋ถˆํ•„์š”ํ•œ ์‹œ๊ธฐ์˜ ๋ณด์ˆ˜โ€ง๋ณด๊ฐ• ๋น„์šฉ์„ ์ค„์ผ ์ˆ˜ ์žˆ๊ณ , ์ด๋ฅผ ํ†ตํ•ด ๊ต๋Ÿ‰ ์šด์˜๋‹จ๊ณ„์—์„œ์˜ ๋ชฉํ‘œ์ˆ˜๋ช… ๊ธฐ๋ฐ˜ ์ฒด๊ณ„์ โ€งํšจ์œจ์ ์ธ ์œ ์ง€๊ด€๋ฆฌ๊ฐ€ ๊ฐ€๋Šฅํ•  ๊ฒƒ์œผ๋กœ ํŒ๋‹จ๋˜๋ฉฐ, ์ด๋Ÿฌํ•œ ์—ฐ๊ตฌ๋ฅผ ํ†ตํ•ด ์–ป์€ ๊ฒฐ๋ก ์€ ์•„๋ž˜์™€ ๊ฐ™๋‹ค.

(1)๊ต๋Ÿ‰ ์šด์˜๋‹จ๊ณ„ ์‹œ ๋ชจ๋‹ˆํ„ฐ๋ง ์—…๋ฐ์ดํŠธ ๊ธฐ๋ฐ˜ ๋ฐœ์ƒ ๊ฐ€๋Šฅํ•œ ์œ ์ง€๊ด€๋ฆฌ ์‹œ๋‚˜๋ฆฌ์˜ค(Case 1~3)๋ฅผ ์ œ์‹œํ•˜๊ณ , ์˜์ข…๋Œ€๊ต ํŠน์ • ๋ถ€์žฌ(๊ฐ•๋ฐ•์Šค ๊ฑฐ๋”)์— ์ ์šฉํ•จ์œผ๋กœ์จ ๊ด€๋ฆฌ์ˆ˜์ค€(๋“ฑ๊ธ‰) ์„ค์ •์— ๋”ฐ๋ฅธ ๋ฒ ์ด์ง€์•ˆ ์—…๋ฐ์ดํŠธ ์œ ๋ฌด๋กœ ๋ฐœ์ƒ๋œ ๋น„์šฉ์˜ ์ฐจ์ต์„ ํ™•์ธํ•˜์˜€๋‹ค. ์ด๋Ÿฌํ•œ ๋น„์šฉ์˜ ์ฐจ์ต์€ ๋ณธ ์—ฐ๊ตฌ์—์„œ ๊ณ ๋ คํ•œ ๊ฐ•๋ฐ•์Šค ๊ฑฐ๋”์˜ ๋“ฑ๊ธ‰๋ณ„ ์œ ์ง€๋ณด์ˆ˜๋น„์šฉ(Fig. 10)์ด ๋‚ฎ์€ ๋“ฑ๊ธ‰(D, E๋“ฑ๊ธ‰)์œผ๋กœ ๊ฐˆ์ˆ˜๋ก 2์ฐจ ๊ณก์„ ์˜ ๊ฒฝํ–ฅ์œผ๋กœ ์ฆ๊ฐ€ํ•˜๊ธฐ ๋•Œ๋ฌธ์ธ ๊ฒƒ์œผ๋กœ ๋ถ„์„ํ•˜์˜€๋‹ค.

(2)๋ณธ ์—ฐ๊ตฌ์—์„œ ๊ณ ๋ คํ•œ ์œ ์ง€๊ด€๋ฆฌ๋น„์šฉ ์‚ฐ์ • ์˜ˆ์‹œ(4.3์ ˆ)์— ๋”ฐ๋ฅด๋ฉด ๊ต๋Ÿ‰์˜ ๊ด€๋ฆฌ์ˆ˜์ค€(๋“ฑ๊ธ‰)์„ B~C๋“ฑ๊ธ‰ ์‚ฌ์ด(0.7)๋กœ ์ •ํ•˜๊ณ  ํŠน์ •์‹œ์ ์—์„œ ์œ ์ง€๊ด€๋ฆฌ๋น„์šฉ์„ ๋ฐœ์ƒ์‹œ์ผฐ์„ ๋•Œ, ํŠน์ • ์‹œ์ (5๋…„)์—์„œ ๋ฒ ์ด์ง€์•ˆ ์—…๋ฐ์ดํŠธ ์‹œ ๊ธฐ์กด ์ƒํƒœ์˜ˆ์ธก๋ชจ๋ธ์˜ ๊ธฐ์šธ๊ธฐ๋ณด๋‹ค ๊ฐ€ํŒŒ๋ฅธ ๊ธฐ์šธ๊ธฐ ๊ฒฝํ–ฅ์„ ๊ฐ–๋Š” Case 3์—์„œ ์•ฝ 22%์˜ ์œ ์ง€๊ด€๋ฆฌ ๋น„์šฉ ์ ˆ๊ฐ ํšจ๊ณผ๋ฅผ ์‚ฐ์ •ํ•˜์˜€๋‹ค. ์ด๋Š” ํ”ผ๋กœ ๊ท ์—ด๊ณผ ๊ฐ™์ด ์—ดํ™” ์ดˆ๊ธฐ์— ํƒ€ ์†์ƒ์œ ํ˜• ๋Œ€๋น„ ์ ๊ฒ€์ด ์–ด๋ ค์šด ์†์ƒ์œ ํ˜•์„ ๊ฒ€์ธกํ•˜๊ณ , ์‚ฌํ›„ ์†์ƒ ๋ฐœ์ƒ์„ ๋ฏธ๋ฆฌ ์˜ˆ์ธกํ•˜์—ฌ 1ํšŒ ์˜ˆ๋ฐฉ์  ๋ณด์ˆ˜โ€ง๋ณด๊ฐ•์ˆ˜ํ–‰์— ๋”ฐ๋ฅธ ๊ฒฐ๊ณผ๋กœ ๋ถ„์„ํ•˜์˜€๋‹ค.

(3)๋ณธ ๋ชจ๋‹ˆํ„ฐ๋ง ์—…๋ฐ์ดํŠธ ๊ธฐ๋ฐ˜ ์œ ์ง€๊ด€๋ฆฌ ์‹œ๋‚˜๋ฆฌ์˜ค ๋ชจ๋ธ์€ ๋ณด๋‹ค ์ •ํ™•ํ•œ ๊ด€๋ฆฌ ๋Œ€์ƒ ๊ตฌ์กฐ๋ฌผ์ด ๊ฐ–๋Š” ์ƒํƒœ๋ฅผ ์˜ˆ์ธกํ•จ์œผ๋กœ์จ ์ตœ์ ์˜ ๋ณด์ˆ˜โ€ง๋ณด๊ฐ•์‹œ๊ธฐ ํŒ๋‹จ ๋“ฑ ์œ ์ง€๊ด€๋ฆฌ ์˜์‚ฌ๊ฒฐ์ • ์ˆ˜๋ฆฝ ์‹œ ์œ ์šฉํ•œ ๊ทผ๊ฑฐ์ž๋ฃŒ๋กœ์„œ์˜ ์ ์šฉ ๊ฐ€๋Šฅ์„ฑ์„ ์ œ์•ˆํ•˜์˜€๋‹ค. ๋ณธ ๋…ผ๋ฌธ์—์„œ ์ œ์•ˆํ•œ ๋ชจ๋‹ˆํ„ฐ๋ง ์—…๋ฐ์ดํŠธ ๊ธฐ๋ฐ˜ ์œ ์ง€๊ด€๋ฆฌ ์‹œ๋‚˜๋ฆฌ์˜ค ๋ชจ๋ธ์€ ํ˜„ํ–‰ ์ธ๋ ฅ๊ธฐ๋ฐ˜ ์œ ์ง€๊ด€๋ฆฌ์™€ ๋น„๊ตํ–ˆ์„ ๋•Œ, ์ดˆ๊ธฐ ์—ดํ™”์˜ ์›์ธ์„ ํŒ๋‹จํ•˜์ง€ ๋ชปํ•ด ๋ฐœ์ƒ ๊ฐ€๋Šฅํ•œ ๋ง‰๋Œ€ํ•œ ๋ณด์ˆ˜โ€ง๋ณด๊ฐ•๋น„์šฉ์„ ์ ˆ์•ฝํ•  ์ˆ˜ ์žˆ์„ ๊ฒƒ์œผ๋กœ ๊ธฐ๋Œ€ํ•œ๋‹ค.

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