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ํ•˜์ด๋ธŒ๋ฆฌ๋“œ ๋ณด, HSRC ๋ณด ์‹œ์Šคํ…œ, ์žฅ๋ถ€์ฒ ๊ทผ, ํœจ ์—ฐ์„ฑ
hybrid beam, HSRC beam, dowel bar, flexural ductility

  • 1. ์„œ ๋ก 

  • 2. ์‹ค ํ—˜

  •   2.1 ์‹คํ—˜์ฒด ์ƒ์„ธ

  •   2.2 ์žฌ๋ฃŒ

  •   2.3 ์‹คํ—˜ ๋ฐ ์ธก์ •๋ฐฉ๋ฒ•

  • 3. ์‹คํ—˜๊ฒฐ๊ณผ ๋ฐ ๋ถ„์„

  •   3.1 ๊ท ์—ด ๋ฐ ํŒŒ๊ดด์–‘์ƒ

  •   3.2 ํ•˜์ค‘-๋ณ€์œ„ ๊ด€๊ณ„

  •   3.3 ํœจ ๋‚ด๋ ฅ

  •   3.4 ํœจ ์—ฐ์„ฑ

  •   3.5 ๋ณ€ํ˜•๋ฅ  ๋ถ„ํฌ

  • 4. ๊ฒฐ ๋ก 

1. ์„œ    ๋ก 

์ตœ๊ทผ ์‚ฐ์—…์‚ฌํšŒ์˜ ๋ฐœ๋‹ฌ๊ณผ ํ•จ๊ป˜ ๊ณต์žฅ๊ฑด๋ฌผ, ์ง‘ํšŒ์‹œ์„ค ๋ฐ ์ฃผ์ฐจ์žฅ๊ณผ ๊ฐ™์€ ์žฅ๊ฒฝ๊ฐ„ ๊ฑด์ถ•๋ฌผ์— ๋Œ€ํ•œ ์ˆ˜์š”๊ฐ€ ์ฆ๊ฐ€ํ•˜๊ณ  ์žˆ๋‹ค.1) ์žฅ๊ฒฝ๊ฐ„ ๊ฑด์ถ•๋ฌผ๋“ค์—์„œ๋Š” ๊ธฐ์กด์˜ ๋‹จ๋…๊ตฌ์กฐ ์‹œ์Šคํ…œ์˜ ํ•œ๊ณ„๋ฅผ ๊ทน๋ณตํ•˜๊ธฐ ์œ„ํ•˜์—ฌ ์„œ๋กœ ๋‹ค๋ฅธ ๊ตฌ์กฐ ์‹œ์Šคํ…œ์„ ์กฐํ•ฉํ•˜๋Š” ํ•˜์ด๋ธŒ๋ฆฌ๋“œ ๋ณด ์‹œ์Šคํ…œ์˜ ์ ์šฉ์ด ์ ์ฐจ ํ™œ์„ฑํ™”๋˜๊ณ  ์žˆ๋‹ค. ํ•˜์ด๋ธŒ๋ฆฌ๋“œ ๋ณด ์‹œ์Šคํ…œ์—์„œ ๊ฐ€์žฅ ๋„๋ฆฌ ์‚ฌ์šฉ๋˜๋Š” ๊ตฌ์กฐ ์‹œ์Šคํ…œ์€ ๊ฐ•์žฌ ๋ณด์™€ ์ฒ ๊ทผ ์ฝ˜ํฌ๋ฆฌํŠธ(reinforced concrete, RC) ๋ณด ์‹œ์Šคํ…œ์ธ๋ฐ, ์ด๋Ÿฌํ•œ ํ•˜์ด๋ธŒ๋ฆฌ๋“œ ๋ณด์—์„œ ํ•ฉ์„ฑ์€ ๋‹จ์ˆœํ•œ ์žฌ๋ฃŒ์  ํ•ฉ์„ฑ์ด ์•„๋‹Œ ์„œ๋กœ ๋‹ค๋ฅธ ๋‘ ์‹œ์Šคํ…œ๊ฐ„์˜ ์—ฐ๊ฒฐ์ ˆ์ ์„ ๊ฐ–๋Š” ๊ตฌ์กฐ์ ์ธ ํ•ฉ์„ฑ์ด๋‹ค.2,3)

๊ฐ•์žฌ ๋ณด์™€ RC ๋ณด๋ฅผ ์‚ฌ์šฉํ•˜๋Š” ๋Œ€๋ถ€๋ถ„์˜ ํ•˜์ด๋ธŒ๋ฆฌ๋“œ ๋ณด ์‹œ์Šคํ…œ4,5)์—์„œ ๋‘ ์‹œ์Šคํ…œ์˜ ์—ฐ๊ฒฐ์ ˆ์ ์€ ์ฃผ๋กœ RC ๋ณด์— ๋งค๋ฆฝ๋œ ๋ณด๊ฐ•์ฒ ๋ฌผ๊ณผ ๊ฐ•์žฌ ๋ณด์™€์˜ ๋ณผํŠธ ์ฒด๊ฒฐ์„ ํ†ตํ•œ ์ ‘ํ•ฉ์œผ๋กœ ์‹œ๊ณต๋œ๋‹ค. ์ด๋Ÿฌํ•œ ๋ณผํŠธ ์ฒด๊ฒฐ๋ฐฉ์‹์€ ๋ณผํŠธ ๊ตฌ๋ฉ์„ ๋งž์ถ”๋Š” ๊ฒƒ์— ์žˆ์–ด์„œ ์‹œ๊ณต์„ฑ์ด ๋ถˆ๋ฆฌํ•˜๋ฉฐ ํฌ๋ ˆ์ธ ์–‘์ค‘ ์‹œ๊ฐ„์˜ ์ฆ๊ฐ€๋กœ ์ธํ•œ ๊ณต๊ธฐ ์ฆ๊ฐ€์˜ ๋ฌธ์ œ์ ์ด ์žˆ๋‹ค. ๋˜ํ•œ ๋ฐ˜๋ณต๊ฐ€๋ ฅ ํ•˜์—์„œ๋Š” RC ๋ณด์— ๋งค๋ฆฝ๋œ ๊ฐ•์žฌ์™€ ์ฝ˜ํฌ๋ฆฌํŠธ์˜ ๊ฐ•์„ฑ ์ฐจ์ด๋กœ ์ธํ•œ ์—ญ์‚ฌ์ธ์žฅ ๊ท ์—ด ๋ฐ ์—ฐ๊ฒฐ์ ˆ์  ํŒŒ๊ดด์˜ ์œ„ํ—˜์„ฑ์ด ์žˆ๋‹ค.6,7)

๋ณผํŠธ ์ ‘ํ•ฉ์„ ์‚ฌ์šฉํ•˜๋Š” ๊ธฐ์กด ํ•˜์ด๋ธŒ๋ฆฌ๋“œ ๋ณด์˜ ๋ฌธ์ œ์ ์„ ๊ฐœ์„ ํ•˜๊ธฐ ์œ„ํ•ด Yang et al.8)์€ H-๋ณด-RC ๋ณด์˜ ์—ฐ๊ฒฐ์ ˆ์ ์„ ๊ฐ–๋Š” ํ•˜์ด๋ธŒ๋ฆฌ๋“œ ๋ณด ์‹œ์Šคํ…œ(hybrid H-steel-reinforced concrete, HSRC)์„ ๊ฐœ๋ฐœํ•˜์˜€๋‹ค. ์‹œ๊ณต์„ฑ๊ณผ ๋ถ€์žฌ์˜ ์—ฐ์„ฑํ–ฅ์ƒ์„ ๊ณ ๋ คํ•˜์—ฌ ๊ฐœ๋ฐœ๋œ HSRC ๋ณด์—์„œ RC ๋ณด๋Š” ํ”„๋ฆฌ์บ์ŠคํŠธ ์ฝ˜ํฌ๋ฆฌํŠธ(precast concrete, PC)๋ฅผ, ์—ฐ๊ฒฐ์ ˆ์  ์˜์—ญ๊ณผ ์ƒ๋ถ€ ์Šฌ๋ž˜๋ธŒ๋Š” ํ˜„์žฅํƒ€์„ค ์ฝ˜ํฌ๋ฆฌํŠธ(cast-in-place concrete, CIP)๋ฅผ ์ด์šฉํ•œ๋‹ค. H-๋ณด์™€ RC ๋ณด๋Š” ์ ‘ํ•ฉ์„ ์œ„ํ•ด H-๋ณด ๋‹จ๋ถ€์— ์šฉ์ ‘๋œ L-ํ˜• ์—ฐ๊ฒฐ์žฌ๋ฅผ ํ†ตํ•ด ์—ฐ๊ฒฐ๋œ๋‹ค. RC ๋ณด์˜ ์ƒยทํ•˜๋ถ€ ์ฃผ์ฒ ๊ทผ ๋ฐ ์žฅ๋ถ€์ฒ ๊ทผ์€ L-ํ˜• ์—ฐ๊ฒฐ์žฌ์— ์ปคํ”Œ๋Ÿฌ๋ฅผ ํ†ตํ•ด ๊ธฐ๊ณ„์  ์ •์ฐฉ์œผ๋กœ ๊ฐ•์ ‘ํ•ฉ ๋˜๋Š”๋ฐ, ์ด๋Š” ํžŒ์ง€์ ‘ํ•ฉ์œผ๋กœ ๊ฐ„์ฃผ๋˜๋Š” ๊ธฐ์กด ๋ณผํŠธ์ฒด๊ฒฐ ๋ฐฉ์‹๋ณด๋‹ค ๋ถ€์žฌ ๊ฐ„์˜ ์‘๋ ฅ์ „๋‹ฌ์— ์œ ๋ฆฌํ•˜๋‹ค.

๊ฑด์ถ•๋ฌผ์˜ ๋‚ด์ง„์„ค๊ณ„๋Š” ์ฃผ๋กœ ๊ฐ•ํ•œ ๊ธฐ๋‘ฅ-์•ฝํ•œ ๋ณด์˜ ๊ฐœ๋…์œผ๋กœ ์„ค๊ณ„๋˜๋ฉฐ, ๋ถ€์žฌ์— ๋ฐœ์ƒ๋˜๋Š” ์†Œ์„ฑํžŒ์ง€์˜ ์œ„์น˜๋Š” ์ „์ฒด ๊ตฌ์กฐ๋ฌผ์˜ ๊ฑฐ๋™์— ์˜ํ–ฅ์„ ๋ฏธ์นœ๋‹ค. ์ œ์•ˆ๋œ ์‹œ์Šคํ…œ์—์„œ ์†Œ์„ฑํžŒ์ง€์˜ ํ˜•์„ฑ ์œ„์น˜๋Š” ์—ฐ๊ฒฐ์ ˆ์ ์˜ ์ ‘ํ•ฉ ์—ฌ๋ถ€์— ๋”ฐ๋ผ ๊ฐ•์žฌ ๋ณด ๋˜๋Š” RC ๋ณด์— ๋ฐœ์ƒํ•  ์ˆ˜ ์žˆ๋Š”๋ฐ, ์ด์— ๋”ฐ๋ผ ๋ชจ๋ฉ˜ํŠธ์˜ ์žฌ๋ถ„๋ฐฐ๊ฐ€ ๋‹ฌ๋ผ์ง„๋‹ค.9) ๋ถ€์žฌ ๋ฐ ๊ตฌ์กฐ๋ฌผ์˜ ์—ฐ์„ฑ์ฆ์ง„์„ ์œ„ํ•ด์„œ๋Š” RC ๋ณด๋ณด๋‹ค๋Š” ๊ธฐ๋‘ฅ๊ณผ ์—ฐ๊ฒฐ๋˜๋Š” ๋‹จ๋ถ€ ๊ฐ•์žฌ ๋ณด์— ์†Œ์„ฑํžŒ์ง€๊ฐ€ ๋ฐœ์ƒ๋˜๋Š” ๊ฒƒ์ด ๋ฐ”๋žŒ์งํ•˜๋‹ค.

์ด ์—ฐ๊ตฌ์˜ ๋ชฉ์ ์€ ๊ฐ•์žฌ ๊ธฐ๋‘ฅ๊ณผ์˜ ์ ‘ํ•ฉ๋ถ€ ์˜์—ญ์—์„œ HSRC ๋ณด์˜ ๋ฐ˜๋ณต ๋‚ด๋ ฅ ๋ฐ ํœจ ๊ฑฐ๋™์„ ํ‰๊ฐ€ํ•˜๋Š” ๊ฒƒ์ด๋‹ค. ์‹คํ—˜๋ณ€์ˆ˜๋Š” ๊ฐ•์žฌ ๋ณด์™€ RC ๋ณด์˜ ์ผ์ฒดํ™”์— ์˜ํ–ฅ์„ ์ฃผ๋Š” ์—ฐ๊ฒฐ์ ˆ์ ์˜ ์ƒ์„ธ๋กœ์จ, ์žฅ๋ถ€์ฒ ๊ทผ์˜ ๋ฐฐ๊ทผ์œ ๋ฌด, ๋ฐฐ๊ทผ๋ฐฉ๋ฒ• ๋ฐ L-ํ˜• ์—ฐ๊ฒฐ์žฌ์˜ ์ƒ์„ธ์ด๋‹ค. ๋ฐ˜๋ณต๊ฐ€๋ ฅ ํ•˜์—์„œ HSRC ๋ณด์˜ ์†Œ์„ฑํžŒ์ง€๋Š” ๊ธฐ๋‘ฅ๊ณผ ์—ฐ๊ฒฐ๋˜๋Š” ๊ฐ•์žฌ ๋ณด ๋‹จ๋ถ€์—์„œ ํ˜•์„ฑ๋˜๋„๋ก ์œ ๋„ํ•˜์˜€๋‹ค. ํ•˜์ค‘์ „๋‹ฌ์— ๋Œ€ํ•œ ์—ฐ๊ฒฐ์ ˆ์ ์˜ ์˜ํ–ฅ์„ ํ‰๊ฐ€ํ•˜๊ธฐ ์œ„ํ•˜์—ฌ HSRC ๋ณด์˜ ๊ธธ์ด๋ฐฉํ–ฅ์—์„œ ๋ณ€ํ˜•๋ฅ  ๋ถ„ํฌ๋ฅผ ์ธก์ •ํ•˜์˜€๋‹ค. ํœจ ์—ฐ์„ฑ์€ ํ•˜์ค‘-๋ณ€์œ„ ๊ด€๊ณ„๋กœ๋ถ€ํ„ฐ ์–ป์€ ๋ณ€์œ„์—ฐ์„ฑ๋น„ ๋ฐ ์ผ ์†์ƒ์ง€์ˆ˜๋กœ๋ถ€ํ„ฐ ํ‰๊ฐ€ํ•˜์˜€๋‹ค.

2. ์‹ค    ํ—˜

2.1 ์‹คํ—˜์ฒด ์ƒ์„ธ

๊ฐ•์žฌ ๊ธฐ๋‘ฅ๊ณผ ์—ฐ๊ฒฐ๋˜๋Š” HSRC ๋ณด ์‹คํ—˜์ฒด์˜ ์ƒ์„ธ๋Š” Fig. 1์— ๋‚˜ํƒ€๋‚ด์—ˆ๋‹ค. ๋ฐ˜๋ณต๊ฐ€๋ ฅ ํ•˜์—์„œ ๊ธฐ๋‘ฅ๊ณผ ์ ‘ํ•ฉ๋œ HSRC ๋ณด์˜ ํœจ ๊ฑฐ๋™์„ ํ‰๊ฐ€ํ•˜๊ธฐ ์œ„ํ•œ 3๊ฐœ์˜ ์‹คํ—˜์ฒด๋Š” ์žฅ๋ถ€์ฒ ๊ทผ์˜ ๋ฐฐ๊ทผ๋ฐฉ๋ฒ• ๋ฐ ์—ฐ๊ฒฐ์ ˆ์ ์˜ ์ƒ์„ธ๋ฅผ ์ฃผ์š”๋ณ€์ˆ˜๋กœ ํ•˜์˜€๋‹ค. ๋‹จ๋ถ€ H-๋ณด์˜ ๊ธธ์ด๋Š” /Resources/kci/JKCI.2017.29.3.291/images/PICA798.gif์˜ ํ•จ์ˆ˜๋กœ์จ /Resources/kci/JKCI.2017.29.3.291/images/PICA7A8.gif๋ฅผ ์„ ํƒํ•˜์˜€๋Š”๋ฐ, ์—ฌ๊ธฐ์„œ, /Resources/kci/JKCI.2017.29.3.291/images/PICA7A9.gif๋Š” ์—ฐ์†๋ณด์˜ ๋ชจ๋ฉ˜ํŠธ ๋ถ„ํฌ์—์„œ ๊ธฐ๋‘ฅ ๋‹จ๋ถ€์—์„œ๋ถ€ํ„ฐ ๋ณ€๊ณก์ ๊นŒ์ง€์˜ ๊ฑฐ๋ฆฌ์ด๋‹ค. Seo et al.10)์€ ๊ฐ•์žฌ ๋ณด์™€ RC ๋ณด์˜ ์—ฐ๊ฒฐ์ ˆ์ ์˜ ์œ„์น˜๋Š” ์—ฐ๊ฒฐ์ ˆ์ ์˜ RC ๋ณด ์˜์—ญ์—์„œ ๊ณผ๋„ํ•œ ๊ท ์—ด์ง„์ „์„ ๋ฐฉ์ง€ํ•˜๊ธฐ ์œ„ํ•˜์—ฌ ๋ณ€๊ณก์ ์— ์œ„์น˜ํ•˜๋Š” ๊ฒƒ์ด ์œ ๋ฆฌํ•จ์„ ๋ณด์˜€๋‹ค. C ์‹คํ—˜์ฒด(Fig. 2(a))๋Š” ์žฅ๋ถ€์ฒ ๊ทผ์ด ๋ฐฐ๊ทผ๋˜์–ด ์žˆ์ง€ ์•Š์€ ์‹คํ—˜์ฒด์ด๋‹ค. A ์‹คํ—˜์ฒด(Fig. 2(b))๋Š” ์žฅ๋ถ€์ฒ ๊ทผ์ด PC ๋ณด์— 600mm์˜ ์ •์ฐฉ ๊ธธ์ด๋ฅผ ํ™•๋ณดํ•˜์—ฌ ๋ฐฐ๊ทผ๋˜์—ˆ์œผ๋ฉฐ, ๋ฐฐ๊ทผ๋œ ์žฅ๋ถ€์ฒ ๊ทผ์€ L-ํ˜• ์—ฐ๊ฒฐ์žฌ์— ์ปคํ”Œ๋Ÿฌ๋ฅผ ์ด์šฉํ•˜์—ฌ ์ •์ฐฉ๋˜์—ˆ๋‹ค. N ์‹คํ—˜์ฒด(Fig. 2(c))๋Š” ์žฅ๋ถ€์ฒ ๊ทผ์„ ์—ฐ๊ฒฐ์ ˆ์  ์˜์—ญ์—์„œ ใ„ท๋ชจ์–‘์œผ๋กœ ์ ˆ๊ณกํ•˜์—ฌ L-ํ˜• ์—ฐ๊ฒฐ์žฌ์— ์ •์ฐฉ์‹œํ‚ค์ง€ ์•Š๊ณ  ๋ฐฐ๊ทผํ•˜์˜€๋‹ค. N ์‹คํ—˜์ฒด์—์„œ L-ํ˜• ์—ฐ๊ฒฐ์žฌ์˜ ํ•˜๋ถ€์ฒ ๊ทผ ๋ฐ›์นจ์˜ ๋†’์ด๋Š” PC ๋†’์ด๊นŒ์ง€ ์ฆ๊ฐ€์‹œ์ผฐ๋‹ค. ์žฅ๋ถ€์ฒ ๊ทผ์˜ ์ •์ฐฉ ๊ธธ์ด๋Š” ์ฝ˜ํฌ๋ฆฌํŠธ ์„ค๊ณ„๊ธฐ์ค€์—์„œ ์š”๊ตฌํ•˜๋Š” ์ธ์žฅ์ฒ ๊ทผ์˜ ์†Œ์š” ์ •์ฐฉ ๊ธธ์ด ์ด์ƒ์œผ๋กœ ํ•˜์˜€๋‹ค.

Fig. 1

Details of section dimension and reinforcement arrangement of specimens

/Resources/kci/JKCI.2017.29.3.291/images/Figure_CONCRETE_29_03_07_F1.jpg
Fig. 2

Joint details between H-beams and RC beams

/Resources/kci/JKCI.2017.29.3.291/images/Figure_CONCRETE_29_03_07_F2.jpg

๋ชจ๋“  ์‹คํ—˜์ฒด์—์„œ ๋ณด์˜ ์ „์ฒด๊ธธ์ด๋Š” 2,400mm์ด๊ณ  H-๋ณด์˜ ๊ธธ์ด๋Š” 960mm์ด๋‹ค. ๊ธฐ๋‘ฅ์€ SM490์˜ H-400 ร— 300 ร— 13 ร— 21 (mm)๋ฅผ ์‚ฌ์šฉํ•˜์˜€๋‹ค. ๋‹จ๋ถ€ H-๋ณด๋Š” SS400์˜ H-400 ร— 300 ร— 9 ร— 14 (mm)๋ฅผ ์‚ฌ์šฉํ•˜์˜€์œผ๋ฉฐ 9mm ๋‘๊ป˜์˜ ์Šคํ‹ฐํ”„๋„ˆ๋ฅผ 100mm ๊ฐ„๊ฒฉ์œผ๋กœ ์šฉ์ ‘ํ•˜์—ฌ H-๋ณด์˜ ๊ตญ๋ถ€์ขŒ๊ตด๊ณผ ์ „๋‹จํŒŒ๊ดด๋ฅผ ๋ฐฉ์ง€ํ•˜์˜€๋‹ค. ๊ธฐ๋‘ฅ๊ณผ ๋‹จ๋ถ€ H-๋ณด๋Š” ์šฉ์ ‘ ์ ‘ํ•ฉํ•˜์˜€๋‹ค. RC ๋ณด์˜ ๋‹จ๋ฉด์€ ๋ชจ๋“  ์‹คํ—˜์ฒด์—์„œ 300 ร— 500mm์ธ๋ฐ, ์—ฌ๊ธฐ์„œ PC ๋ณด๋Š” 350mm์ด๊ณ  ํ˜„์žฅ ํƒ€์„ค ์ฝ˜ํฌ๋ฆฌํŠธ ๋ถ€์œ„์ธ ์ƒ๋ถ€ ์Šฌ๋ž˜๋ธŒ๋Š” 150mm์ด๋‹ค. RC ๋ณด์™€ H-๋ณด์˜ ์—ฐ๊ฒฐ์„ ์œ„ํ•œ L-ํ˜• ์—ฐ๊ฒฐ์žฌ๋Š” 25mm ๋‘๊ป˜๋กœ ์ œ์ž‘ํ•˜์˜€์œผ๋ฉฐ H-๋ณด ๋‹จ๋ถ€์— ์šฉ์ ‘์œผ๋กœ ์ ‘ํ•ฉํ•˜์˜€๋‹ค. ์žฅ๋ถ€์ฒ ๊ทผ์ด ๋ฐฐ๊ทผ๋˜์–ด์žˆ์ง€ ์•Š์€ ์‹คํ—˜์ฒด์˜ L-ํ˜• ์—ฐ๊ฒฐ์žฌ์—๋Š” ์ฝ˜ํฌ๋ฆฌํŠธ์˜ ๋ฏธ๋„๋Ÿฌ์ง์„ ๋ฐฉ์ง€ํ•˜๊ธฐ ์œ„ํ•˜์—ฌ ์ง๊ฒฝ 19mm์˜ ์Šคํ„ฐ๋“œ ๋ณผํŠธ๋ฅผ ์šฉ์ ‘ํ•˜์˜€๋‹ค. ์ƒยทํ•˜๋ถ€ ์ฃผ์ฒ ๊ทผ์€ 4-D25๋ฅผ ๋ฐฐ๊ทผํ•˜์˜€์œผ๋ฉฐ, ์ด๋•Œ์˜ ์ฒ ๊ทผ๋น„๋Š” 1.6%์ด๋‹ค. ์ „๋‹จ์ฒ ๊ทผ์€ ๋ชจ๋“  ์‹คํ—˜์ฒด์—์„œ ์ง๊ฒฝ 13mm์˜ ์ฒ ๊ทผ์„ ์‚ฌ์šฉํ•˜์˜€๋Š”๋ฐ, ๋ฐฐ๊ทผ๊ฐ„๊ฒฉ์€ ์—ฐ๊ฒฐ์ ˆ์  ์˜์—ญ์—์„œ 40mm, RC ๋ณด ์˜์—ญ์—์„œ๋Š” 80mm์ด๋‹ค. ๋ชจ๋“  ์‹คํ—˜์ฒด๋Š” ๊ฐ•์žฌ ๊ธฐ๋‘ฅ, H-๋ณด ๋ฐ L-ํ˜• ์—ฐ๊ฒฐ์žฌ๋ฅผ ๊ฐ๊ฐ ์ œ์ž‘ํ•œ ํ›„์— ์šฉ์ ‘ ์ ‘ํ•ฉํ•˜์˜€์œผ๋ฉฐ, ๋ฏธ๋ฆฌ ์ œ์ž‘๋œ PC ๋ณด๋ฅผ L-ํ˜• ์—ฐ๊ฒฐ์žฌ์— ๊ฑฐ์น˜ํ•œ ํ›„, PC ๋ณด์˜ ํ•˜๋ถ€ ์ฃผ์ฒ ๊ทผ ๋˜๋Š” ์žฅ๋ถ€์ฒ ๊ทผ์„ ์ปคํ”Œ๋Ÿฌ๋ฅผ ์ด์šฉํ•˜์—ฌ ์ •์ฐฉํ•˜์˜€๋‹ค. ์ดํ›„์—๋Š” ์ƒ๋ถ€ ์ฃผ์ฒ ๊ทผ์„ ๋ฐฐ๊ทผํ•˜์˜€์œผ๋ฉฐ, ํ˜„์žฅ ํƒ€์„ค ์ฝ˜ํฌ๋ฆฌํŠธ ๋ถ€์œ„์ธ ์—ฐ๊ฒฐ์ ˆ์  ์˜์—ญ๊ณผ ์Šฌ๋ž˜๋ธŒ๋ฅผ ํƒ€์„คํ•˜์˜€๋‹ค.

2.2 ์žฌ๋ฃŒ

๋ถ€์žฌ ์‹คํ—˜์— ์‚ฌ์šฉ๋œ ์ฝ˜ํฌ๋ฆฌํŠธ์˜ ์„ค๊ณ„ ์••์ถ•๊ฐ•๋„๋Š” 50MPa๋กœ ํ•˜์˜€์œผ๋ฉฐ, ์„ค๊ณ„ ์••์ถ•๊ฐ•๋„๋ฅผ ๊ณ ๋ คํ•˜์—ฌ ๊ฒฐ์ •๋œ ๋ฐฐํ•ฉํ‘œ๋Š” Table 1์— ๋‚˜ํƒ€๋‚ด์—ˆ๋‹ค. ํƒ€์„ค์€ ํ”„๋ฆฌ์บ์ŠคํŠธ ์ฝ˜ํฌ๋ฆฌํŠธ์™€ ํ˜„์žฅํƒ€์„ค ์ฝ˜ํฌ๋ฆฌํŠธ ์˜์—ญ์—์„œ ๋ชจ๋‘ ๋ ˆ๋ฏธ์ฝ˜์„ ์ด์šฉํ•˜์˜€๋‹ค. ํƒ€์„ค๋œ ์ฝ˜ํฌ๋ฆฌํŠธ์˜ ์••์ถ•๊ฐ•๋„์™€ ์‘๋ ฅ-๋ณ€ํ˜•๋ฅ  ๊ด€๊ณ„๋Š” KS ๊ธฐ์ค€11)์—์„œ ์ œ์‹œํ•˜๋Š” ํ‘œ์ค€ ์›์ฃผ ๊ณต์‹œ์ฒด(/Resources/kci/JKCI.2017.29.3.291/images/PICA7BA.gif100 ร— 200mm)๋ฅผ ์ด์šฉํ•˜์—ฌ ์ธก์ •ํ•˜์˜€๋‹ค. ์ฝ˜ํฌ๋ฆฌํŠธ ์••์ถ•๊ฐ•๋„๋Š” ๋ถ€์žฌ ์‹คํ—˜ ์ง์ „์— ์ธก์ •ํ•˜์˜€์œผ๋ฉฐ, ํ”„๋ฆฌ์บ์ŠคํŠธ ์ฝ˜ํฌ๋ฆฌํŠธ ์˜์—ญ๊ณผ ํ˜„์žฅํƒ€์„ค ์ฝ˜ํฌ๋ฆฌํŠธ ์˜์—ญ์—์„œ ๊ฐ๊ฐ 59.0MPa์™€ 57.5MPa์˜€๋‹ค.

Table 2์—๋Š” ๊ฐ•์žฌ ๊ธฐ๋‘ฅ, ๊ฐ•์žฌ ๋ณด ๋ฐ RC ๋ณด์— ์‚ฌ์šฉ๋œ H-ํ˜•๊ฐ•๊ณผ ์ฒ ๊ทผ์˜ ์—ญํ•™์ ์ธ ํŠน์„ฑ์„ ๋‚˜ํƒ€๋‚ด์—ˆ๋‹ค. ์ด๋“ค์˜ ํ‰๊ฐ€๋Š” KS ๊ธฐ์ค€12)์— ๋”ฐ๋ผ ์ˆ˜ํ–‰ํ•˜์˜€๋‹ค. Fig. 3์—๋Š” ๊ฐ•์žฌ์˜ ์‘๋ ฅ-๋ณ€ํ˜•๋ฅ  ๊ด€๊ณ„๋ฅผ ๋‚˜ํƒ€๋‚ด์—ˆ๋‹ค. ์ฃผ์ฒ ๊ทผ์œผ๋กœ ์‚ฌ์šฉ๋œ ์ง๊ฒฝ 25mm ์ฒ ๊ทผ์˜ ํ•ญ๋ณต๊ฐ•๋„๋Š” 524MPa์ด์—ˆ๋‹ค. ์žฅ๋ถ€์ฒ ๊ทผ์€ ์ง๊ฒฝ 16mm ์ฒ ๊ทผ์„ ์‚ฌ์šฉํ•˜์˜€์œผ๋ฉฐ, ํ•ญ๋ณต๊ฐ•๋„๋Š” 474MPa์ด์—ˆ๋‹ค. ๊ฐ•์žฌ ๋ณด์— ์‚ฌ์šฉ๋œ SS400 ๊ฐ•์žฌ์˜ ํ•ญ๋ณต๊ฐ•๋„๋Š” 315MPa์ด์—ˆ๋‹ค. ์‹คํ—˜์ฒด์— ์‚ฌ์šฉ๋œ H-ํ˜•๊ฐ•๊ณผ ์ฒ ๊ทผ์˜ ํƒ„์„ฑ๊ณ„์ˆ˜๋Š” ์•ฝ 200,000MPa์ด์—ˆ๋‹ค.

Table 1 Mixture proportion of concrete

/Resources/kci/JKCI.2017.29.3.291/images/Table_CONCRETE_29_03_07_T1.jpg

Note) W/C = water/cement ratio, S/a = sand/aggregate ratio, W = water, C = cement, S = sand, G = gravel

Table 2 Mechanical properties of metallic materials

/Resources/kci/JKCI.2017.29.3.291/images/Table_CONCRETE_29_03_07_T2.jpg
Fig. 3

Stress-strain curve of metallic materials

/Resources/kci/JKCI.2017.29.3.291/images/Figure_CONCRETE_29_03_07_F3.jpg

2.3 ์‹คํ—˜ ๋ฐ ์ธก์ •๋ฐฉ๋ฒ•

Fig. 4์—๋Š” ๊ฐ•์žฌ ๊ธฐ๋‘ฅ๊ณผ ์ ‘ํ•ฉ๋œ HSRC ๋ณด์˜ ๋ฐ˜๋ณต๊ฐ€๋ ฅ์„ ์œ„ํ•œ ์ธก์ • ์ƒ์„ธ๋ฅผ ๋‚˜ํƒ€๋‚ด์—ˆ๋‹ค. ์‹คํ—˜์ฒด๋Š” H-๊ธฐ๋‘ฅ์— ๋‹จ๋ถ€ H-๋ณด๋ฅผ ์šฉ์ ‘ํ•˜์—ฌ ๋ฐ˜๋ณต๊ฐ€๋ ฅ์ด ๊ฐ€๋Šฅํ•˜๋„๋ก ์„ธํŒ…ํ•˜์˜€๋‹ค. ๊ธฐ๋‘ฅ์€ ์ƒยทํ•˜๋ถ€ ํžŒ์ง€๋ฅผ ๋‘๊ณ  ๊ฐ๊ฐ 10๊ฐœ์˜ ๊ฐ•์žฌ ๋ฝ๋ณผํŠธ(rock bolts)๋ฅผ ์ด์šฉํ•˜์—ฌ ๊ฐ€๋ ฅ์‹œ์Šคํ…œ์— ๊ณ ์ •ํ•˜์˜€๋‹ค. ์‹คํ—˜์ฒด์—๋Š” ๋ฐ˜๋ณต๊ฐ€๋ ฅ์— ๋”ฐ๋ฅธ H-๋ณด ๋ฐ ์ฒ ๊ทผ์˜ ๋ณ€ํ˜•๋ฅ ์„ ํŒŒ์•…ํ•˜๊ธฐ ์œ„ํ•˜์—ฌ H-๋ณด ๋‹จ๋ถ€ ๋ฐ ์—ฐ๊ฒฐ์ ˆ์  ์˜์—ญ ์ฒ ๊ทผ์— ์ „๊ธฐ ์ €ํ•ญ์‹ ์™€์ด์–ด ์ŠคํŠธ๋ ˆ์ธ ๊ฒŒ์ด์ง€(wire strain gauge, WSG)๋ฅผ ๋ถ€์ฐฉํ•˜์˜€์œผ๋ฉฐ ๋ถ€์žฌ์˜ ํ•ญ๋ณต์€ ๋ถ€์žฌ์— ๋ถ€์ฐฉ๋œ WSG์˜ ๋ณ€ํ˜•๋ฅ ์ด ํ•ญ๋ณต๋ณ€ํ˜•๋ฅ ์— ๋„๋‹ฌํ•˜์˜€์„ ๋•Œ๋กœ ํ•˜์˜€๋‹ค. ๊ฐ€๋ ฅ์€ 2,000kN ์šฉ๋Ÿ‰์˜ ์•ก์ถ”์—์ดํ„ฐ๋ฅผ ์‚ฌ์šฉํ•˜์—ฌ ๋ณด ์ž์œ ๋‹จ์—์„œ ๋ณ€์œ„์ œ์–ด๋กœ 1์  ๋ฐ˜๋ณต๊ฐ€๋ ฅ ํ•˜์˜€๋‹ค. Fig. 5์—๋Š” ๋ณ€์œ„์ œ์–ด ๊ธฐ๋ฐ˜์˜ ๊ฐ€๋ ฅ์ด๋ ฅ์„ ๋‚˜ํƒ€๋‚ด์—ˆ๋‹ค. ๊ฐ ํ•˜์ค‘์ด๋ ฅ ๋‹จ๊ณ„(step)๋Š” ํ•ด๋‹น ํ•˜์ค‘์ด๋ ฅ ๋‹จ๊ณ„์˜ ๋ณ€์œ„๋ฅผ ๊ธฐ์ค€์œผ๋กœ 3 ์‚ฌ์ดํด(cycle)์”ฉ ๋ฐ˜๋ณตํ•˜์˜€๋Š”๋ฐ, ์ด๋•Œ์˜ ํ•˜์ค‘์ด๋ ฅ ๋‹จ๊ณ„ ๋‹น ๋ณ€์œ„๋Š” ๋ถ€์žฌํ•ญ๋ณต๋ณ€์œ„(/Resources/kci/JKCI.2017.29.3.291/images/PICA7BB.gif)์˜ 0.75โˆผ6๋ฐฐ๋กœ ์ฆ๋ถ„ํ•˜์˜€๋‹ค. ๋ฐ˜๋ณต๊ฐ€๋ ฅ ํ•˜์—์„œ HSRC ๋ณด์˜ ์†Œ์„ฑํžŒ์ง€๋Š” H-๋ณด ๋‹จ๋ถ€์—์„œ ํ˜•์„ฑ๋˜๋„๋ก ์œ ๋„๋˜์—ˆ๊ธฐ ๋•Œ๋ฌธ์— /Resources/kci/JKCI.2017.29.3.291/images/PICA7BC.gif๋Š” H-๋ณด ํ”Œ๋žœ์ง€์˜ ๋ณ€ํ˜•๋ฅ ์ด ํ•ญ๋ณต๋ณ€ํ˜•๋ฅ ์— ๋„๋‹ฌํ•˜์˜€์„ ๋•Œ, HSRC ๋ณด ์ž์œ ๋‹จ์—์„œ์˜ ๋ณ€์œ„๋กœ ํ•˜์˜€๋‹ค. HSRC ๋ณด ์ž์œ ๋‹จ์—์„œ์˜ ๋ณ€์œ„๋Š” 300mm ์šฉ๋Ÿ‰์˜ ๋ณ€์œ„๊ณ„(linear variable differential transducers, LVDTs)๋ฅผ ์ด์šฉํ•˜์—ฌ ์ธก์ •ํ•˜์˜€์œผ๋ฉฐ, ์‹คํ—˜์€ ๋ถ€์žฌ์˜ ๊ณผ๋„ํ•œ ๋ณ€ํ˜•, ๋˜๋Š” ํ•˜์ค‘์ด ์ตœ๋Œ€ ๋‚ด๋ ฅ์˜ 80%์ดํ•˜๋กœ ๊ฐ์†Œํ•˜์˜€์„ ๋•Œ๊นŒ์ง€ ์ˆ˜ํ–‰ํ•˜์˜€๋‹ค.

Fig. 4

Test set-up

/Resources/kci/JKCI.2017.29.3.291/images/Figure_CONCRETE_29_03_07_F4.jpg
Fig. 5

Cyclic loading history

/Resources/kci/JKCI.2017.29.3.291/images/Figure_CONCRETE_29_03_07_F5.jpg

3. ์‹คํ—˜๊ฒฐ๊ณผ ๋ฐ ๋ถ„์„

3.1 ๊ท ์—ด ๋ฐ ํŒŒ๊ดด์–‘์ƒ

๊ฐ ์‹คํ—˜์ฒด์˜ RC ๋ณด์—์„œ ๊ท ์—ด์–‘์ƒ์€ Fig. 6์— ๋‚˜ํƒ€๋‚ด์—ˆ๋‹ค. ์ดˆ๊ธฐ ๊ท ์—ด์€ PC์™€ CIP์˜ ์ˆ˜์ง ๊ฒฝ๊ณ„๋ฉด ๋ฐ L-ํ˜• ์—ฐ๊ฒฐ์žฌ ๋ถ€๊ทผ์—์„œ ๋ฐœ์ƒํ•˜์˜€๋‹ค. ๊ท ์—ด์€ ํ•˜์ค‘์˜ ์ง„์ „๊ณผ ํ•จ๊ป˜ RC ๋ณด์—์„œ ํœจ ๋ชจ๋ฉ˜ํŠธ๊ฐ€ ๊ฐ€์žฅ ํฌ๊ฒŒ ์ž‘์šฉํ•˜๋Š” ์—ฐ๊ฒฐ์ ˆ์  ์˜์—ญ์— ์ง‘์ค‘๋˜์—ˆ์œผ๋ฉฐ, ๋Œ€๋ถ€๋ถ„ ์—ฐ๊ฒฐ์ ˆ์  ์˜์—ญ์—์„œ๋ถ€ํ„ฐ ์•ฝ 400mm ๋ฒ”์œ„์— ๋ฐœ์ƒํ•˜์˜€๋‹ค. ์—ฐ๊ฒฐ์ ˆ์  ์˜์—ญ์˜ ์ฝ˜ํฌ๋ฆฌํŠธ๋Š” ์ตœ๋Œ€ ๋‚ด๋ ฅ ์ดํ›„์— L-ํ˜• ์—ฐ๊ฒฐ์žฌ ํ•˜๋ถ€์ฒ ๊ทผ๋ฐ›์นจ ๋ถ€๊ทผ์—์„œ ํƒˆ๋ฝ์ด ๋ฐœ์ƒํ•˜์˜€๋‹ค. ๋ชจ๋“  ์‹คํ—˜์ฒด์˜ ๊ท ์—ด ์–‘์ƒ์€ ์œ ์‚ฌํ•˜์˜€์œผ๋ฉฐ ์žฅ๋ถ€์ฒ ๊ทผ ๋ฐฐ๊ทผ์ด๋‚˜ ์—ฐ๊ฒฐ์ ˆ์  ์ƒ์„ธ์— ๋”ฐ๋ฅธ ์ฐจ์ด๋Š” ๋งค์šฐ ๋ฏธ๋ฏธํ•˜์˜€๋‹ค.

Fig. 6

Crack propagation in the RC beam region of each specimen

/Resources/kci/JKCI.2017.29.3.291/images/Figure_CONCRETE_29_03_07_F6.jpg

๋ชจ๋“  ์‹คํ—˜์ฒด๋Š” RC ๋ณด์˜ ์ฃผ์ฒ ๊ทผ ํ•ญ๋ณต ์ด์ „์— H-๋ณด๊ฐ€ ํ•ญ๋ณตํ•˜์˜€์œผ๋ฉฐ ๋ถ€์žฌ์˜ ํ•ญ๋ณต ์ดํ›„์— ๋ณด-๊ธฐ๋‘ฅ ์šฉ์ ‘์ ‘ํ•ฉ๋ถ€, ๋˜๋Š” L-ํ˜• ์—ฐ๊ฒฐ์žฌ ํ•˜๋ถ€์ฒ ๊ทผ๋ฐ›์นจ์ด ํŒŒ๊ดด๋˜์—ˆ๋‹ค. C ์‹คํ—˜์ฒด(Fig. 7(a))๋Š” ์ตœ๋Œ€๋‚ด๋ ฅ์— ๋„๋‹ฌํ•œ ์ดํ›„ ํ•˜์ค‘์ด ์„œ์„œํžˆ ๊ฐ์†Œํ•˜๋‹ค๊ฐ€ /Resources/kci/JKCI.2017.29.3.291/images/PICA7CD.gif(์ •๋ชจ๋ฉ˜ํŠธ ๋ฐฉํ–ฅ)์—์„œ L-ํ˜• ์—ฐ๊ฒฐ์žฌ ํ•˜๋ถ€์ฒ ๊ทผ๋ฐ›์นจ์ด ํŒŒ๊ดด๋˜์—ˆ๋‹ค. A ์‹คํ—˜์ฒด(Fig. 7(b))๋Š” /Resources/kci/JKCI.2017.29.3.291/images/PICA7CE.gif(๋ถ€๋ชจ๋ฉ˜ํŠธ ๋ฐฉํ–ฅ)์—์„œ ๊ฐ•์žฌ ๊ธฐ๋‘ฅ๊ณผ H-๋ณด ์ƒ๋ถ€ํ”Œ๋žœ์ง€์˜ ์šฉ์ ‘์ ‘ํ•ฉ๋ถ€์˜ ์„ ํ–‰ํŒŒ๊ดด๋กœ ์ธํ•ด ๋ถ€๋ชจ๋ฉ˜ํŠธ ๋ฐฉํ–ฅ์˜ ๊ฐ€๋ ฅ์ด ๋ถˆ๊ฐ€๋Šฅํ•˜์—ฌ ์ดํ›„์—๋Š” ์ •๋ชจ๋ฉ˜ํŠธ ๋ฐฉํ–ฅ์˜ ๊ฐ€๋ ฅ๋งŒ ์ˆ˜ํ–‰ํ•˜์˜€๋‹ค. A ์‹คํ—˜์ฒด์˜ H-๋ณด๋Š” /Resources/kci/JKCI.2017.29.3.291/images/PICA7CF.gif(์ •๋ชจ๋ฉ˜ํŠธ ๋ฐฉํ–ฅ) ๊ฐ€๋ ฅ ์ดํ›„์— ์›จ๋ธŒ์˜ ํŒŒ๊ดด๊ฐ€ ๋ฐœ์ƒํ•˜์˜€๋‹ค. N ์‹คํ—˜์ฒด(Fig. 7(c))๋Š” /Resources/kci/JKCI.2017.29.3.291/images/PICA7DF.gif(์ •๋ชจ๋ฉ˜ํŠธ ๋ฐฉํ–ฅ)์—์„œ ๊ธฐ๋‘ฅ๊ณผ H-๋ณด ํ•˜๋ถ€ํ”Œ๋žœ์ง€์˜ ์šฉ์ ‘ํƒˆ๋ฝ์ด ๋ฐœ์ƒํ•˜์˜€๋‹ค. ์ดํ›„์—๋Š” ๋ถ€๋ชจ๋ฉ˜ํŠธ ๋ฐฉํ–ฅ์˜ ๊ฐ€๋ ฅ๋งŒ ์ˆ˜ํ–‰ํ•˜์˜€์œผ๋ฉฐ /Resources/kci/JKCI.2017.29.3.291/images/PICA7E0.gif(๋ถ€๋ชจ๋ฉ˜ํŠธ ๋ฐฉํ–ฅ)์—์„œ H-๋ณด ์ƒ๋ถ€ํ”Œ๋žœ์ง€ ๋ฐ ์šฉ์ ‘๋ถ€์˜ ํŒŒ๊ดด๋กœ ์ธํ•ด ๊ฐ€๋ ฅ์„ ์ข…๋ฃŒํ•˜์˜€๋‹ค.

Fig. 7

Failure zone of each specimen

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3.2 ํ•˜์ค‘-๋ณ€์œ„ ๊ด€๊ณ„

Fig. 8์—๋Š” ๊ฐ ์‹คํ—˜์ฒด์˜ ํ•˜์ค‘-๋ณ€์œ„ ๊ด€๊ณ„๋ฅผ ๋‚˜ํƒ€๋‚ด์—ˆ์œผ๋ฉฐ, Table 3์—๋Š” ์‹คํ—˜๊ฒฐ๊ณผ๋ฅผ ์š”์•ฝํ•˜์˜€๋‹ค. Fig. 8์—์„œ โ€˜+โ€™ ์˜์—ญ์€ ์ •๋ชจ๋ฉ˜ํŠธ ๋ฐฉํ–ฅ(โ†‘) ํ•˜์ค‘์ด๋ฉฐ โ€˜-โ€™์˜์—ญ์€ ๋ถ€๋ชจ๋ฉ˜ํŠธ๋ฐฉํ–ฅ(โ†“) ํ•˜์ค‘์ด๋‹ค. ๋ชจ๋“  ์‹คํ—˜์ฒด์—์„œ ๋ณด ์ž์œ ๋‹จ์˜ ๋ณ€์œ„๋Š” ์ตœ์ดˆ ํœจ ๊ท ์—ด์˜ ๋ฐœ์ƒ๊ณผ ํ•จ๊ป˜ ๊ธ‰๊ฒฉํžˆ ์ฆ๊ฐ€ํ•˜์˜€๋‹ค. ์ž‘์šฉํ•˜์ค‘์€ H-๋ณด ํ”Œ๋žœ์ง€์˜ ํ•ญ๋ณต ์ดํ›„ ์™„๋งŒํ•˜๊ฒŒ ์ฆ๊ฐ€ํ•˜์˜€๋‹ค. ๋˜ํ•œ ์ตœ๋Œ€ ๋‚ด๋ ฅ ์ „ ๋™์ผ ๋ณ€์œ„์—์„œ์˜ ๊ฐ•๋„ ์ €๊ฐ์œจ์€ 1% ์ด๋‚ด์˜€๋‹ค. ๊ฐ ์‹คํ—˜์ฒด์˜ ์ตœ๋Œ€ํ•˜์ค‘์€ /Resources/kci/JKCI.2017.29.3.291/images/PICA7F1.gif ๋˜๋Š” /Resources/kci/JKCI.2017.29.3.291/images/PICA7F2.gif์—์„œ ๋„๋‹ฌํ•˜์˜€์œผ๋ฉฐ, ์ดํ›„์—๋Š” ํ•˜์ค‘์ด ๊ฐ์†Œํ•˜๊ฑฐ๋‚˜ ์šฉ์ ‘ ์ ‘ํ•ฉ๋ถ€์˜ ํŒŒ๊ดด๋กœ ๊ฐ€๋ ฅ์ด ๋ถˆ๊ฐ€๋Šฅํ•˜์˜€๋‹ค. ์ดˆ๊ธฐ ๋™์ผ ๋ณ€์œ„์—์„œ ์ •๋ชจ๋ฉ˜ํŠธ ๋ฐฉํ–ฅ ํ•˜์ค‘์€ ๋ถ€๋ชจ๋ฉ˜ํŠธ ๋ฐฉํ–ฅ ํ•˜์ค‘์— ๋น„ํ•ด ์•ฝ 80โˆผ90%์˜€๋Š”๋ฐ, ๊ทธ ์ฐจ์ด๋Š” ๋ณ€์œ„์˜ ์ฆ๋ถ„๊ณผ ํ•จ๊ป˜ ์ž‘์•„์ง€๋Š” ์–‘์ƒ์„ ๋‚˜ํƒ€๋ƒˆ๋‹ค. ๋˜ํ•œ ๋ชจ๋“  ์‹คํ—˜์ฒด๋Š” RC ๋ณด์˜ ๊ท ์—ด๋กœ ์ธํ•ด ํ•€์นญํ˜„์ƒ์ด ๋‚˜ํƒ€๋‚ฌ์ง€๋งŒ, N ์‹คํ—˜์ฒด๋Š” L-ํ˜• ์—ฐ๊ฒฐ์žฌ ํ•˜๋ถ€ ์ฒ ๊ทผ๋ฐ›์นจ์ด PC ๋ณด ๋†’์ด๊นŒ์ง€ ์ฆ๊ฐ€๋˜์–ด ๋‹ค๋ฅธ ์‹คํ—˜์ฒด๋ณด๋‹ค ํ•€์นญํ˜„์ƒ์ด ์ ์—ˆ๋‹ค. C ์‹คํ—˜์ฒด๋Š” /Resources/kci/JKCI.2017.29.3.291/images/PICA7F3.gif ์ •ยท๋ถ€๋ชจ๋ฉ˜ํŠธ ๋ฐฉํ–ฅ์—์„œ ๋ชจ๋‘ ์ตœ๋Œ€ํ•˜์ค‘์— ๋„๋‹ฌํ•˜์˜€์œผ๋ฉฐ, /Resources/kci/JKCI.2017.29.3.291/images/PICA804.gif ๋‘ ๋ฒˆ์งธ ์‚ฌ์ดํด์—์„œ ์ตœ๋Œ€ํ•˜์ค‘์˜ 80%๋กœ ํ•˜์ค‘์ด ๊ฐ์†Œํ•˜์˜€๋‹ค. A ์‹คํ—˜์ฒด์˜ ์ตœ๋Œ€๋‚ด๋ ฅ์€ ์ •๋ชจ๋ฉ˜ํŠธ ๋ฐฉํ–ฅ์—์„œ /Resources/kci/JKCI.2017.29.3.291/images/PICA805.gif์— ๋„๋‹ฌํ•˜์˜€์ง€๋งŒ, ๋ถ€๋ชจ๋ฉ˜ํŠธ ๋ฐฉํ–ฅ์—์„œ๋Š” /Resources/kci/JKCI.2017.29.3.291/images/PICA806.gif์—์„œ ๋ฐœ์ƒํ•œ ์šฉ์ ‘์ ‘ํ•ฉ๋ถ€ ์„ ํ–‰ํŒŒ๊ดด๋กœ ์ธํ•ด ์ •๋ชจ๋ฉ˜ํŠธ ๋ฐฉํ–ฅ๋ณด๋‹ค ์•ฝ 7% ๋‚ฎ์•˜๋‹ค. N ์‹คํ—˜์ฒด๋Š” ์ •ยท๋ถ€ ๋ชจ๋ฉ˜ํŠธ ๋ฐฉํ–ฅ์—์„œ ๋Œ€์นญ์˜ ํ•˜์ค‘-๋ณ€์œ„ ๊ด€๊ณ„๋ฅผ ๋ณด์˜€๋‹ค. ์‹คํ—˜์ฒด A์™€ N์€ ์ตœ๋Œ€๋‚ด๋ ฅ ์ดํ›„ ๋ณด์™€ ๊ธฐ๋‘ฅ์˜ ์ ‘ํ•ฉ๋ถ€์—์„œ ์šฉ์ ‘๋ถ€์˜ ํŒŒ๊ดด๋กœ ์˜ˆ์ƒ ์ตœ๋Œ€๋ณ€์œ„ ์ด์ „์— ์ • ๋˜๋Š” ๋ถ€ ๋ชจ๋ฉ˜ํŠธ ๋ฐฉํ–ฅ์—์„œ์˜ ๊ฐ€๋ ฅ์ด ์ข…๋ฃŒ๋˜์—ˆ๋‹ค. ๋งŒ์•ฝ ์šฉ์ ‘๋‚ด๋ ฅ์ด ์ ์ ˆํ•˜๊ฒŒ ํ™•๋ณด๋˜์—ˆ๋‹ค๋ฉด, HSRC ๋ณด์—์„œ์˜ ๋” ๋งŽ์€ ๊ฐ€๋ ฅ์ด๋ ฅ์ด ๊ฐ€๋Šฅํ•  ๊ฒƒ์œผ๋กœ ํŒ๋‹จ๋œ๋‹ค.

Fig. 8

Load-displacement relationship

/Resources/kci/JKCI.2017.29.3.291/images/Figure_CONCRETE_29_03_07_F8.jpg

3.3 ํœจ ๋‚ด๋ ฅ

Table 4์—๋Š” ์‹คํ—˜๋œ HSRC ๋ณด์˜ ํœจ ๋ชจ๋ฉ˜ํŠธ ์‹คํ—˜๊ฐ’๊ณผ ์˜ˆ์ธก๊ฐ’์˜ ๋น„๊ต๋ฅผ ๋‚˜ํƒ€๋‚ด์—ˆ๋‹ค. ๊ฐ•์žฌ ๋ณด์˜ ํ•ญ๋ณต์— ์˜ํ•ด ๊ฒฐ์ •๋˜๋Š” HSRC ๋ณด์˜ ์ตœ๋Œ€ ํœจ ๋‚ด๋ ฅ์€ H-๋ณด์˜ ์™„์ „ ์†Œ์„ฑ์ƒํƒœ๋ฅผ ๊ฐ€์ •ํ•˜์—ฌ ์‚ฐ์ •ํ•˜์˜€๋‹ค. A ์‹คํ—˜์ฒด์—์„œ ๋ถ€๋ชจ๋ฉ˜ํŠธ ๋ฐฉํ–ฅ์˜ ์ตœ๋Œ€ ํœจ ๋‚ด๋ ฅ์€ ์ •๋ชจ๋ฉ˜ํŠธ ๋ฐฉํ–ฅ์˜ ๊ฐ’์— ๋น„ํ•ด ์•ฝ 7% ๋‚ฎ๊ฒŒ ๋‚˜ํƒ€๋‚ฌ๋Š”๋ฐ, ์ด๋Š” ์ •๋ชจ๋ฉ˜ํŠธ ๋ฐฉํ–ฅ ๊ฐ€๋ ฅ ์‹œ์— ๋ฐœ์ƒํ•œ ์šฉ์ ‘๋ถ€์˜ ์„ ํ–‰ํŒŒ๊ดด ๋•Œ๋ฌธ์ด๋‹ค. ๋ชจ๋“  ์‹คํ—˜์ฒด์—์„œ ํœจ ๋‚ด๋ ฅ์— ๋Œ€ํ•œ ์‹คํ—˜๊ฐ’๊ณผ ์˜ˆ์ธก๊ฐ’์˜ ๋น„๋Š” ์•ฝ 1.00โˆผ1.09 ๋ฒ”์œ„์— ์žˆ์—ˆ์œผ๋ฉฐ, ์žฅ๋ถ€์ฒ ๊ทผ์ด HSRC ๋ณด์˜ ์ตœ๋Œ€ ํœจ ๋‚ด๋ ฅ์— ๋ฏธ์น˜๋Š” ์˜ํ–ฅ์€ ๋ฏธ๋ฏธํ•˜์˜€๋‹ค. ์ฆ‰, ๋ถ€์žฌ์˜ ํœจ ํŒŒ๊ดด๊ฐ€ RC ๋ณด๋ณด๋‹ค๋Š” ๊ฐ•์žฌ ๋ณด์— ์˜ํ•ด ์ง€๋ฐฐ๋˜๋Š” HSRC ๋ณด์˜ ์ตœ๋Œ€ ํœจ ๋‚ด๋ ฅ์€ H-๋ณด์˜ ์™„์ „์†Œ์„ฑ ์‘๋ ฅ๋ถ„ํฌ์— ๋น„ํ•ด ์•ˆ์ „ ์ธก์—์„œ ํ‰๊ฐ€๋  ์ˆ˜ ์žˆ์—ˆ๋‹ค.

3.4 ํœจ ์—ฐ์„ฑ

Fig. 9์—๋Š” ๊ฐ ์‹คํ—˜์ฒด์˜ ํ•˜์ค‘-๋ณ€์œ„ ๊ด€๊ณ„๋กœ๋ถ€ํ„ฐ ์‚ฐ์ •๋œ ๋ณ€์œ„์—ฐ์„ฑ๋น„๋ฅผ ๋‚˜ํƒ€๋‚ด์—ˆ๋‹ค. HSRC ๋ณด์˜ ๋ณ€์œ„์—ฐ์„ฑ๋น„(/Resources/kci/JKCI.2017.29.3.291/images/PICA807.gif)๋Š” ์ตœ๋Œ€๋‚ด๋ ฅ ์‹œ์˜ ๋ณ€์œ„(/Resources/kci/JKCI.2017.29.3.291/images/PICA817.gif)๋ฅผ H-๋ณด ํ•ญ๋ณต ์‹œ์˜ ๋ณ€์œ„(/Resources/kci/JKCI.2017.29.3.291/images/PICA818.gif)๋กœ ๋‚˜๋ˆ„์–ด ์‚ฐ์ •ํ•˜์˜€๋‹ค.13) ๋ณ€์œ„์—ฐ์„ฑ๋น„๋Š” ์šฉ์ ‘๋ถ€๊ฐ€ ์„ ํ–‰ํŒŒ๊ดด๋œ A ์‹คํ—˜์ฒด์˜ ๋ถ€๋ชจ๋ฉ˜ํŠธ ๋ฐฉํ–ฅ๊ณผ N ์‹คํ—˜์ฒด์˜ ์ •๋ชจ๋ฉ˜ํŠธ ๋ฐฉํ–ฅ์„ ์ œ์™ธํ•œ ๋ชจ ์‹คํ—˜์ฒด์—์„œ 4.64 ์ด์ƒ์ด์—ˆ๋‹ค. C ์‹คํ—˜์ฒด์˜ ๋ถ€๋ชจ๋ฉ˜ํŠธ ๋ฐฉํ–ฅ์—์„œ์˜ ๋ณ€์œ„์—ฐ์„ฑ๋น„๋Š” 5.01๋กœ ๊ฐ€์žฅ ๋†’์•˜์ง€๋งŒ, A ๋ฐ N ์‹คํ—˜์ฒด์™€ ํฐ ์ฐจ์ด๋ฅผ ๋ณด์ด์ง€ ์•Š์•˜๋‹ค. ๋ณ€์œ„์—ฐ์„ฑ๋น„์— ๋Œ€ํ•œ ์žฅ๋ถ€์ฒ ๊ทผ์˜ ์˜ํ–ฅ์€ ๋ฏธ๋ฏธํ•˜์˜€๋Š”๋ฐ, ์ด๋Š” ์—ฐ๊ฒฐ์ ˆ์ ์—์„œ์˜ ํ•˜์ค‘์ „๋‹ฌ์ด ์›ํ™œํ•˜๊ฒŒ ์ด๋ฃจ์–ด์ ธ ๋ถ€์žฌ์˜ ๊ฑฐ๋™์ด H-๋ณด์˜ ํ•ญ๋ณต์— ์˜ํ•ด ๊ฒฐ์ •๋˜์—ˆ๊ธฐ ๋•Œ๋ฌธ์ด๋‹ค.

Table 3 Summary of test results

/Resources/kci/JKCI.2017.29.3.291/images/Table_CONCRETE_29_03_07_T3.jpg

Note: = initial flexural cracking load, = yield load, = ultimate load , = free end displacement at the yielding of H-beams, = free end displacement at the peak load, (=) = displacement ductility ratio, and = work damage index, The positive(โ†‘) and negative (โ†“) moment directions are identified using โ€˜+โ€™ and โ€˜-โ€™, respectively.

* The ultimate displacement at the negative or positive direction could not be measured in specimens A and N because of a premature welding failure of flanges of H-beam connected with H-column.

Table 4 Comparisons of measured peak loads and predictions

/Resources/kci/JKCI.2017.29.3.291/images/Table_CONCRETE_29_03_07_T4.jpg

Note: = measured moment capacity, and = predictions calculated from the perfect plasticity section

Fig. 9

Displacement ductility ratio of specimens

/Resources/kci/JKCI.2017.29.3.291/images/Figure_CONCRETE_29_03_07_F9.jpg

ํ•˜์ค‘์ด๋ ฅ์— ๋”ฐ๋ฅธ ๊ฐ ์‹คํ—˜์ฒด์˜ ์ผ์†์ƒ์ง€์ˆ˜(/Resources/kci/JKCI.2017.29.3.291/images/PICA829.gif)๋Š” Fig. 10์— ๋‚˜ํƒ€๋‚ด์—ˆ๋‹ค. ์ผ์†์ƒ์ง€์ˆ˜๋Š” Sheikh and Khourv14)์˜ ๋ชจ๋ธ์„ ํ†ตํ•ด ๋‹ค์Œ๊ณผ ๊ฐ™์€ ์‹์œผ๋กœ ์‚ฐ์ •ํ•˜์˜€๋‹ค.

Fig. 10

Cumulative work damage indictor of specimens

/Resources/kci/JKCI.2017.29.3.291/images/Figure_CONCRETE_29_03_07_F10.jpg

/Resources/kci/JKCI.2017.29.3.291/images/PICA82A.gif (1)

/Resources/kci/JKCI.2017.29.3.291/images/PICA83A.gif (2)

/Resources/kci/JKCI.2017.29.3.291/images/PICA83B.gif (3)

์—ฌ๊ธฐ์„œ, /Resources/kci/JKCI.2017.29.3.291/images/PICA83C.gif์€ ์‹คํ—˜์ฒด์˜ ์ตœ๋Œ€ํ•˜์ค‘, /Resources/kci/JKCI.2017.29.3.291/images/PICA84D.gif๋Š” ์ด ์‚ฌ์ดํด์˜ ๊ฐœ์ˆ˜, /Resources/kci/JKCI.2017.29.3.291/images/PICA84E.gif์€ /Resources/kci/JKCI.2017.29.3.291/images/PICA84F.gif๋ฒˆ์งธ ์‚ฌ์ดํด, /Resources/kci/JKCI.2017.29.3.291/images/PICA860.gif์€ ์—๋„ˆ์ง€์˜ ์–‘, /Resources/kci/JKCI.2017.29.3.291/images/PICA861.gif์™€ /Resources/kci/JKCI.2017.29.3.291/images/PICA862.gif๋Š” ์ • ๋ฐ ๋ถ€๋ฐฉํ–ฅ์˜ ๊ฐ•์„ฑ ๋ฐ /Resources/kci/JKCI.2017.29.3.291/images/PICA872.gif์™€ /Resources/kci/JKCI.2017.29.3.291/images/PICA873.gif๋Š” ์ • ๋ฐ ๋ถ€๋ฐฉํ–ฅ์˜ ์ตœ๋Œ€๋ณ€์œ„๋ฅผ ๋‚˜ํƒ€๋‚ธ๋‹ค. ๋ชจ๋“  ์‹คํ—˜์ฒด์˜ ์ผ์†์ƒ์ง€์ˆ˜๋Š” /Resources/kci/JKCI.2017.29.3.291/images/PICA874.gif (12Cycle)๊นŒ์ง€ ์œ ์‚ฌํ•œ ๊ฒฝํ–ฅ์„ ๋ณด์ด๋ฉฐ ์ ์ง„์ ์œผ๋กœ ์ฆ๊ฐ€ํ•˜์˜€๋‹ค. A ์‹คํ—˜์ฒด๋Š” /Resources/kci/JKCI.2017.29.3.291/images/PICA885.gif (15Cycle)์—์„œ C ์‹คํ—˜์ฒด๋ณด๋‹ค ์•ฝ 49% ๋†’์€ ์—๋„ˆ์ง€ ์†Œ์‚ฐ๋Šฅ๋ ฅ์„ ๋ณด์˜€์ง€๋งŒ ์šฉ์ ‘๋ถ€์˜ ํŒŒ๊ดด๋กœ ์ธํ•ด ์ •๋ชจ๋ฉ˜ํŠธ ๋ฐฉํ–ฅ ๊ฐ€๋ ฅ๋งŒ ์ˆ˜ํ–‰ํ•œ /Resources/kci/JKCI.2017.29.3.291/images/PICA886.gif (16Cycle)๋ถ€ํ„ฐ๋Š” C ์‹คํ—˜์ฒด๋ณด๋‹ค ๋‚ฎ์€ ์—๋„ˆ์ง€ ์†Œ์‚ฐ ๋Šฅ๋ ฅ์„ ๋ณด์˜€๋‹ค. N ์‹คํ—˜์ฒด์˜ ์ผ์†์ƒ์ง€์ˆ˜๋Š” /Resources/kci/JKCI.2017.29.3.291/images/PICA887.gif (16Cycle)์—์„œ ๋‹ค๋ฅธ ์‹คํ—˜์ฒด๋ณด๋‹ค ๋†’์•˜์œผ๋‚˜ ์ดํ›„ ์ •๋ชจ๋ฉ˜ํŠธ ๋ฐฉํ–ฅ ์šฉ์ ‘๋ถ€์˜ ํŒŒ๊ดด๋กœ ์ธํ•ด ์ฆ๊ฐ€๋Ÿ‰์ด ํฌ๊ฒŒ ๊ฐ์†Œํ•˜์˜€๋‹ค. C ์‹คํ—˜์ฒด๋Š” ์šฉ์ ‘๋ถ€์˜ ์„ ํ–‰ํŒŒ๊ดด ์—†์ด ์ •ยท๋ถ€๋ชจ๋ฉ˜ํŠธ ๋ฐฉํ–ฅ์—์„œ ๋‹ค๋ฅธ ์‹คํ—˜์ฒด๋ณด๋‹ค ๋” ๋งŽ์€ ํšŸ์ˆ˜๋ฅผ ๊ฐ€๋ ฅ ํ•˜์˜€๊ธฐ ๋•Œ๋ฌธ์— ์ผ์†์ƒ์ง€์ˆ˜๊ฐ€ ์ง€์†์ ์œผ๋กœ ์ฆ๊ฐ€ํ•˜์˜€์œผ๋ฉฐ ์ตœ์ข…์ ์œผ๋กœ ๊ฐ€์žฅ ๋†’์€ ์ผ์†์ƒ์ง€์ˆ˜๋ฅผ ๋‚˜ํƒ€๋ƒˆ๋‹ค.

A ์‹คํ—˜์ฒด๋Š” ๋ณด-๊ธฐ๋‘ฅ ์ ‘ํ•ฉ๋ถ€์˜ ์šฉ์ ‘๋ถ€๊ฐ€ ์„ ํ–‰ํŒŒ๊ดด๋œ ์ดํ›„ ๋ถ€๋ชจ๋ฉ˜ํŠธ ๋ฐฉํ–ฅ ๊ฐ€๋ ฅ๋งŒ ์ˆ˜ํ–‰ํ•˜์˜€๋Š”๋ฐ, Fig. 10์—๋Š” ์šฉ์ ‘๋ถ€ ์„ ํ–‰ํŒŒ๊ดด๊ฐ€ ๋ฐœ์ƒํ•˜์ง€ ์•Š์„ ๊ฒฝ์šฐ ์ •ยท๋ถ€ ๋Œ€์นญ๊ฑฐ๋™์„ ๊ฐ€์ •ํ•˜์—ฌ ์ผ์†์ƒ์ง€์ˆ˜๋ฅผ ํ‰๊ฐ€ํ•˜์˜€๋‹ค(dotted line in Fig. 10). ๋Œ€์นญ๊ฑฐ๋™์œผ๋กœ ๊ฐ€์ •๋œ A ์‹คํ—˜์ฒด์˜ ์ผ์†์ƒ์ง€์ˆ˜๋Š” C ์‹คํ—˜์ฒด์™€ ์œ ์‚ฌํ•œ ๊ฑฐ๋™์„ ๋ณด์˜€๋‹ค. ์ฆ‰ ๋ณด-๊ธฐ๋‘ฅ ์ ‘ํ•ฉ๋ถ€์—์„œ ์šฉ์ ‘ํŒŒ๊ดด๊ฐ€ ์„ ํ–‰๋˜์ง€ ์•Š๋Š”๋‹ค๋ฉด HSRC ๋ณด๋Š” ๋ณ€์œ„์—ฐ์„ฑ๋น„ 4.6 ์ด์ƒ์˜ ์ถฉ๋ถ„ํ•œ ์—ฐ์„ฑ์„ ํ™•๋ณดํ•  ์ˆ˜ ์žˆ๋‹ค๊ณ  ํŒ๋‹จ๋œ๋‹ค.

3.5 ๋ณ€ํ˜•๋ฅ  ๋ถ„ํฌ

Fig. 11์—๋Š” C ์‹คํ—˜์ฒด์—์„œ /Resources/kci/JKCI.2017.29.3.291/images/PICA898.gif์™€ /Resources/kci/JKCI.2017.29.3.291/images/PICA899.gif์˜ ๋ณ€์œ„ ์‹œ ๋ณด ๊ธธ์ด๋ฅผ ๋”ฐ๋ฅธ ์ฃผ์ฒ ๊ทผ ๋ฐ H-๋ณด ํ”Œ๋žœ์ง€์—์„œ ์ธก์ •๋œ ๋ณ€ํ˜•๋ฅ  ๋ถ„ํฌ๋ฅผ ๋‚˜ํƒ€๋‚ด์—ˆ๋‹ค. A์™€ N ์‹คํ—˜์ฒด์—์„œ ์ธก์ •๋œ ๋ณ€ํ˜•๋ฅ  ๋ถ„ํฌ๋Š” C ์‹คํ—˜์ฒด์™€ ์œ ์‚ฌํ•œ ๊ฒฝํ–ฅ์„ ๋ณด์˜€๊ธฐ ๋•Œ๋ฌธ์— Fig. 11์— ๋‚˜ํƒ€๋‚ด์ง€ ์•Š์•˜๋‹ค. ์‹คํ—˜์ฒด์˜ ์†Œ์„ฑํžŒ์ง€๋Š” ๋ณด-๊ธฐ๋‘ฅ ์ ‘ํ•ฉ๋ถ€์˜ ๊ฐ•์žฌ ๋ณด์—์„œ ๋ฐœ์ƒ๋˜๋„๋ก ์œ ๋„ํ•˜์˜€๊ธฐ ๋•Œ๋ฌธ์— RC ๋ณด์˜ ์ฃผ์ฒ ๊ทผ์€ /Resources/kci/JKCI.2017.29.3.291/images/PICA89A.gif๊นŒ์ง€ ํ•ญ๋ณต ๋ณ€ํ˜•๋ฅ ์— ๋„๋‹ฌํ•˜์ง€ ์•Š์•˜๋‹ค. ๋ณด ๊ธธ์ด ๋ฐฉํ–ฅ์„ ๋”ฐ๋ฅธ ์ฃผ์ฒ ๊ทผ ๋ฐ H-๋ณด ํ”Œ๋žœ์ง€์˜ ๋ณ€ํ˜•๋ฅ  ๋ถ„ํฌ๋Š” ๋ชจ๋“  ์‹คํ—˜์ฒด์—์„œ ํœจ ๋ชจ๋ฉ˜ํŠธ๋„์™€ ์œ ์‚ฌํ•˜๊ฒŒ ๋‚˜ํƒ€๋‚ฌ์œผ๋ฉฐ, ๋ณ€์œ„ ์ฆ๋ถ„์— ๋”ฐ๋ผ ๋น„๋ก€์ ์œผ๋กœ ์ฆ๊ฐ€ํ•˜๋Š” ๊ฑฐ๋™์„ ๋ณด์˜€๋‹ค. ๋”ฐ๋ผ์„œ, HSRC ๋ณด์˜ H-๋ณด์™€ RC ๋ณด๋Š” ์žฅ๋ถ€์ฒ ๊ทผ์˜ ๋ฐฐ๊ทผ๊ณผ ๊ด€๊ณ„์—†์ด RC ๋ณด ์ฃผ์ฒ ๊ทผ์˜ ์‘๋ ฅ์ด L-ํ˜• ์—ฐ๊ฒฐ์žฌ๋ฅผ ํ†ตํ•ด H-๋ณด๋กœ ์›ํ™œํ•˜๊ฒŒ ์ „๋‹ฌ๋˜๊ณ  ์žˆ๋‹ค๊ณ  ํŒ๋‹จ๋œ๋‹ค.

Fig. 11

Typical strain distributions measured in the flanges of H-steel and longitudinal bars (C specimen)

/Resources/kci/JKCI.2017.29.3.291/images/Figure_CONCRETE_29_03_07_F11.jpg

4. ๊ฒฐ    ๋ก 

๊ฐ•์žฌ ๊ธฐ๋‘ฅ๊ณผ ์ ‘ํ•ฉ๋œ HSRC ๋ณด ์‹คํ—˜์ฒด์—์„œ ์†Œ์„ฑํžŒ์ง€๋Š” H-๋ณด์—์„œ ์œ ๋„ํ•˜์˜€์ง€๋งŒ, A์™€ N ์‹คํ—˜์ฒด๋Š” ์˜ˆ์ƒ์น˜ ๋ชปํ•œ ๋ณด-๊ธฐ๋‘ฅ ์ ‘ํ•ฉ๋ฉด ์šฉ์ ‘๋ถ€์˜ ์„ ํ–‰ํŒŒ๊ดด๊ฐ€ ๋ฐœ์ƒํ•˜์˜€์œผ๋ฉฐ, ์ด๋กœ ์ธํ•ด ๋” ๋งŽ์€ ๊ฐ€๋ ฅ์„ ์ˆ˜ํ–‰ํ•˜์ง€ ๋ชปํ•˜์˜€๋‹ค. ๋ฐ˜๋ณต๊ฐ€๋ ฅ ์‹คํ—˜์œผ๋กœ๋ถ€ํ„ฐ ์–ป์€ ๋ถ€์žฌ์˜ ๊ท ์—ด์ง„์ „, ํ•˜์ค‘-๋ณ€์œ„ ๊ด€๊ณ„, ๋ณ€ํ˜•๋ฅ  ๋ถ„ํฌ ๋“ฑ์„ ๋ถ„์„ํ•œ ๊ฒฐ๊ณผ, ๋‹ค์Œ๊ณผ ๊ฐ™์€ ๊ฒฐ๋ก ์„ ์–ป์—ˆ๋‹ค.

1)HSRC ๋ณด์˜ ์—ฐ๊ฒฐ์ ˆ์ ์— ๋ฐฐ๊ทผ๋œ ์žฅ๋ถ€์ฒ ๊ทผ์ด ๋ณด์˜ ๊ท ์—ด ์ง„์ „, ์ตœ๋Œ€ ํœจ ๋‚ด๋ ฅ ๋ฐ ์—ฐ์„ฑ์— ๋ฏธ์น˜๋Š” ์˜ํ–ฅ์€ ๋ฏธ๋ฏธํ•˜์˜€๋‹ค.

2)์‹คํ—˜์ฒด A์™€ N๋Š” ์šฉ์ ‘๋ถ€ ์„ ํ–‰ํŒŒ๊ดด๋กœ ์ธํ•ด ์ • ๋˜๋Š” ๋ถ€๋ชจ๋ฉ˜ํŠธ ๊ฐ€๋ ฅ ๋ฐฉํ–ฅ์—์„œ ์ตœ๋Œ€๋‚ด๋ ฅ ์ดํ›„ ๊ฐ€๋ ฅ์„ ์ง„ํ–‰ํ•  ์ˆ˜ ์—†์—ˆ์ง€๋งŒ, ๋ชจ๋“  ์‹คํ—˜์ฒด์˜ ๋ณ€์œ„์—ฐ์„ฑ๋น„๋Š” ์ตœ์†Œ ํ•œ์ชฝ๊ฐ€๋ ฅ๋ฐฉํ–ฅ์— ๋Œ€ํ•˜์—ฌ 4.6 ์ด์ƒ์ด์—ˆ๋‹ค.

3)ํœจ ํŒŒ๊ดด๊ฐ€ RC ๋ณด๋ณด๋‹ค๋Š” ๊ฐ•์žฌ ๋ณด์— ์˜ํ•ด ์ง€๋ฐฐ๋˜๋Š” HSRC ๋ณด์˜ ํœจ ๋‚ด๋ ฅ์€ H-๋ณด ๋‹จ๋ฉด์˜ ์™„์ „์†Œ์„ฑ ์‘๋ ฅ๋ถ„ํฌ์— ์˜ํ•ด ์•ˆ์ „ ์ธก์—์„œ ํ‰๊ฐ€๋  ์ˆ˜ ์žˆ์—ˆ๋‹ค.

4)HSRC ๋ณด ๊ธธ์ด๋ฅผ ๋”ฐ๋ฅธ ์ฃผ์ฒ ๊ทผ ๋ฐ H-๋ณด ํ”Œ๋žœ์ง€์—์„œ์˜ ๋ณ€ํ˜•๋ฅ  ๋ถ„ํฌ๋Š” ํœจ ๋ชจ๋ฉ˜ํŠธ๋„์™€ ์œ ์‚ฌํ•˜์˜€์œผ๋ฉฐ, ๋ณ€์œ„ ์ฆ๋ถ„์— ๋”ฐ๋ผ ๋น„๋ก€์ ์œผ๋กœ ์ฆ๊ฐ€ํ•˜์˜€๋‹ค.

Acknowledgements

์ด ์—ฐ๊ตฌ๋Š” 2016๋…„๋„ ์‚ฐ์—…ํ†ต์ƒ์ž์›๋ถ€์˜ ์žฌ์›์œผ๋กœ ์ค‘์†Œ๊ธฐ์—…์ฒญ(๊ณผ์ œ๋ฒˆํ˜ธ: S2298119)์™€ ๊ฒฝ๊ธฐ๋Œ€ํ•™๊ต ๋Œ€ํ•™์› ์—ฐ๊ตฌ์›์žฅํ•™์ƒ ์žฅํ•™๊ธˆ ์ง€์›์— ์˜ํ•˜์—ฌ ์ˆ˜ํ–‰๋˜์—ˆ์Œ.

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