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์ตœ์†Œ ์ฒ ๊ทผ๋Ÿ‰, ์—ฐ์„ฑ๊ฑฐ๋™, ์‚ฌ์šฉํ•œ๊ณ„์ƒํƒœ, ๊ท ์—ด ์ œ์–ด, ์ฒ ๊ทผ์ฝ˜ํฌ๋ฆฌํŠธ
minimum reinforcement, ductile behavior, service limit state, crack control, reinforced concrete

  • 1. ์„œ ๋ก 

  • 2. ์ตœ์†Œ ์ฒ ๊ทผ๋Ÿ‰ ๊ทœ์ •์˜ ๋„์ถœ ๊ทผ๊ฑฐ

  •   2.1 ์ตœ์†Œ ํœจ ์ฒ ๊ทผ๋Ÿ‰

  •   2.2 ์ˆ˜์ถ•โ€ง์˜จ๋„ ์ฒ ๊ทผ

  •   2.3 ์‚ฌ์šฉํ•œ๊ณ„์ƒํƒœ(๊ท ์—ด์ œ์–ด) ์ตœ์†Œ ์ฒ ๊ทผ๋Ÿ‰

  • 3. ๋‹จ๋ฉด์— ๋Œ€ํ•œ ์ตœ์†Œ ์ฒ ๊ทผ ๋ฐฐ๊ทผ ๋น„๊ต

  •   3.1 ์ตœ์†Œ ํœจ ์ฒ ๊ทผ๋Ÿ‰

  •   3.2 ์ˆ˜์ถ•โ€ง์˜จ๋„ ์ฒ ๊ทผ

  •   3.3 ์‚ฌ์šฉํ•œ๊ณ„์ƒํƒœ(๊ท ์—ด์ œ์–ด) ์ตœ์†Œ ์ฒ ๊ทผ๋Ÿ‰

  • 4. ๊ฒฐ ๋ก 

1. ์„œ    ๋ก 

์ตœ๊ทผ์— ์šฐ๋ฆฌ๋‚˜๋ผ ๋„๋กœ๊ต์„ค๊ณ„๊ธฐ์ค€์ด ๊ธฐ์กด ๊ฐ•๋„์„ค๊ณ„๋ฒ•๊ธฐ๋ฐ˜์—์„œ ํ•œ๊ณ„์ƒํƒœ์„ค๊ณ„๋ฒ•์œผ๋กœ ๊ฐœ์ •๋˜์—ˆ๋‹ค. ๊ฐœ์ •๋œ ๋„๋กœ๊ต์„ค๊ณ„๊ธฐ์ค€(ํ•œ๊ณ„์ƒํƒœ์„ค๊ณ„๋ฒ•, ์ดํ•˜ KHBDC)์—๋Š” ์ผ๋ถ€ ๊ฐ•๋„์„ค๊ณ„๋ฒ•๊ณผ Eurocode 2: Design of Concrete Structure(์ดํ•˜ EC2)์— ๊ธฐ๋ฐ˜ํ•œ ํ•œ๊ณ„์ƒํƒœ์„ค๊ณ„๋ฒ•์ด ํ˜ผ์žฌํ•˜๊ธฐ๋„ ํ•˜๋Š”๋ฐ, ์ด ๊ฒฝ์šฐ ๊ธฐ์กด ๊ฐ•๋„์„ค๊ณ„๋ฒ•์— ๊ธฐ๋ฐ˜์„ ๋‘” ๊ทœ์ •์ด ๊ฐœ์ •๋œ ์„ค๊ณ„๊ธฐ์ค€์ฒด๊ณ„์—์„œ๋„ ๊ทธ๋Œ€๋กœ ์ ์šฉ ๊ฐ€๋Šฅํ•œ ์ง€ ๋ฉด๋ฐ€ํžˆ ๋ถ„์„ํ•  ํ•„์š”๊ฐ€ ์žˆ๋‹ค. ์ด ์—ฐ๊ตฌ์—์„œ๋Š” ์ด๋Ÿฌํ•œ ๊ฒ€ํ† ์˜ ์ผํ™˜์œผ๋กœ ์ฒ ๊ทผ์ฝ˜ํฌ๋ฆฌํŠธ ํœจ ๋ถ€์žฌ์˜ ์ตœ์†Œ ์ฒ ๊ทผ๋Ÿ‰ ๊ทœ์ •์— ๋Œ€ํ•˜์—ฌ ๋ถ„์„ํ•ด ๋ณด์•˜๋‹ค.

๊ฐ์ข… ์„ค๊ณ„๊ธฐ์ค€์—์„œ ์ฑ„ํƒํ•˜๊ณ  ์žˆ๋Š” ํœจ ๋ถ€์žฌ์˜ ์ตœ์†Œ ์ฒ ๊ทผ๋Ÿ‰์— ๋Œ€ํ•œ ๊ทœ์ •์€ ๊ทธ ๋ชฉ์ ์— ๋”ฐ๋ผ ํฌ๊ฒŒ ์„ธ ๊ฐ€์ง€๋กœ ๊ตฌ๋ถ„ํ•  ์ˆ˜ ์žˆ๋‹ค. ์ฒซ์งธ, ๋ถ€์žฌ์˜ ์—ฐ์„ฑ๊ฑฐ๋™์„ ๋ณด์žฅํ•˜๊ธฐ ์œ„ํ•œ ๊ทœ์ •์ด ์žˆ๋‹ค. ์ด ๊ทœ์ •์€ ๋ฌด๊ทผ์ฝ˜ํฌ๋ฆฌํŠธ ๋‹จ๋ฉด์˜ ํœจ ๊ฐ•๋„, ์ฆ‰ ์ธ์žฅ์—ฐ๋‹จ์— ๊ท ์—ด์„ ๋ฐœ์ƒ์‹œํ‚ค๋Š” ํœจ๋ชจ๋ฉ˜ํŠธ๋ณด๋‹ค ์ฒ ๊ทผ์ฝ˜ํฌ๋ฆฌํŠธ ๋‹จ๋ฉด์˜ ํœจ ๊ฐ•๋„๋ฅผ ๋” ํฌ๊ฒŒ ํ•˜์—ฌ ๊ฐ‘์ž‘์Šค๋Ÿฐ ํŒŒ๊ดด๋ฅผ ๋ฐฉ์ง€ํ•œ๋‹ค(Nilson et al. 2010; Lee 2016). ์ด ๊ทœ์ •์€ ์ด ๋…ผ๋ฌธ์—์„œ โ€˜์ตœ์†Œ ํœจ ์ฒ ๊ทผ๋Ÿ‰ ๊ทœ์ •โ€™์ด๋ผ๊ณ  ์นญํ•˜์˜€๋‹ค. ๋‘˜์งธ๋กœ ์ˆ˜์ถ•โ€ง์˜จ๋„ ์ฒ ๊ทผ์— ๋Œ€ํ•œ ๊ทœ์ •์ด ์žˆ๋‹ค. ์ฝ˜ํฌ๋ฆฌํŠธ ๋ถ€์žฌ์˜ ๊ฑด์กฐ์ˆ˜์ถ•์ด๋‚˜ ์˜จ๋„ ๋ณ€ํ™”๋กœ ์ธํ•œ ๊ท ์—ด์˜ ํญ์„ ์ œ์–ดํ•˜์—ฌ ํญ์ด ํฐ ์†Œ์ˆ˜์˜ ๊ท ์—ด๋ณด๋‹ค๋Š” ํญ์ด ์ž‘์€ ๋‹ค์ˆ˜์˜ ๊ท ์—ด์ด ๋ฐœ์ƒํ•˜๋„๋ก ํ•˜๋Š” ๋ฐ์— ๊ทธ ๋ชฉ์ ์ด ์žˆ๋‹ค(Nilson et al. 2010).

๋งˆ์ง€๋ง‰์œผ๋กœ KHBDC์™€ EC2 ๋“ฑ์—์„œ๋Š” ์‚ฌ์šฉํ•œ๊ณ„์ƒํƒœ์— ๋Œ€ํ•œ ๊ทœ์ • ์ค‘ ๊ท ์—ด์˜ ํญ์„ ์ œํ•œํ•˜๊ธฐ ์œ„ํ•œ ์ตœ์†Œ ์ฒ ๊ทผ๋Ÿ‰ ๊ทœ์ •์„ ๋‘๊ณ  ์žˆ๋‹ค. ์ด์ƒ์˜ ๊ทœ์ •๋“ค์€ ๊ฐ™์€ ๋ชฉ์ ์„ ๊ฐ–๊ณ  ์žˆ์Œ์—๋„ ์„ค๊ณ„ ๊ธฐ์ค€๋งˆ๋‹ค ๋‹ค๋ฅด๊ฒŒ ๊ทœ์ •ํ•˜๋Š” ๊ฒฝ์šฐ๊ฐ€ ์กด์žฌํ•œ๋‹ค. ๋”ฐ๋ผ์„œ ๊ฐ ๊ทœ์ •์˜ ๋„์ถœ ๊ทผ๊ฑฐ์— ๋Œ€ํ•ด ์ •ํ™•ํ•œ ์ดํ•ด๊ฐ€ ํ•„์š”ํ•˜๊ณ  ์ด ๊ทœ์ •์„ ์‹ค์ œ ๊ตฌ์กฐ๋ฌผ์— ์ ์šฉํ•˜์˜€์„ ๋•Œ ๊ทธ ์ฐจ์ด์— ๋Œ€ํ•œ ๋ถ„์„์ด ์š”๊ตฌ๋œ๋‹ค. ์ด ์—ฐ๊ตฌ์—์„œ๋Š” ์ตœ์†Œ ํœจ ์ฒ ๊ทผ, ์ˆ˜์ถ•โ€ง์˜จ๋„ ์ฒ ๊ทผ, ์‚ฌ์šฉํ•œ๊ณ„์ƒํƒœ ์ตœ์†Œ ์ฒ ๊ทผ๋Ÿ‰ ๊ทœ์ •๊ณผ ๊ด€๋ จํ•˜์—ฌ ์šฐ๋ฆฌ๋‚˜๋ผ ์ฝ˜ํฌ๋ฆฌํŠธ๊ตฌ์กฐ๊ธฐ์ค€(์ดํ•˜ KCI), KHBDC, ACI 318: Building Code Requirements for Concrete Structure(์ดํ•˜ ACI 318) ๊ทธ๋ฆฌ๊ณ  EC2์—์„œ ์ œ์‹œํ•˜๋Š” ๊ทœ์ •์˜ ๋„์ถœ ๊ทผ๊ฑฐ๋ฅผ ๋น„๊ต๋ถ„์„ํ•˜๊ณ , ์ด ๊ทœ์ •๋“ค์„ ์ง์‚ฌ๊ฐํ˜• ๋ฐ Tํ˜• ๋‹จ๋ฉด์— ์ ์šฉํ•˜์—ฌ ๊ฐ ์„ค๊ณ„๊ธฐ์ค€์ƒ์˜ ๊ทœ์ • ๊ฐ„ ์ฐจ์ด๋ฅผ ๋น„๊ต ๋ถ„์„ํ•˜์˜€๋‹ค.

2. ์ตœ์†Œ ์ฒ ๊ทผ๋Ÿ‰ ๊ทœ์ •์˜ ๋„์ถœ ๊ทผ๊ฑฐ

2.1 ์ตœ์†Œ ํœจ ์ฒ ๊ทผ๋Ÿ‰

์ตœ์†Œ ํœจ ์ฒ ๊ทผ๋Ÿ‰ ๊ทœ์ •์€ ๊ฒ€ํ† ํ•œ 4์ข…์˜ ์„ค๊ณ„๊ธฐ์ค€ ๋ชจ๋‘์—์„œ ๊ทœ์ •ํ•˜๊ณ  ์žˆ์œผ๋ฉฐ, Table 1์— ๊ฐ ์„ค๊ณ„๊ธฐ์ค€์˜ ์ตœ์†Œ ํœจ ์ฒ ๊ทผ๋Ÿ‰ ๊ทœ์ •์„ ์ •๋ฆฌํ•˜์˜€๋‹ค. KCI(Korea Concrete Institute (KCI) 2012a), KHBDC(Korea Road Association 2016), ACI 318(ACI Committee 318 2014)์€ ๋ถ€์žฌ์˜ ์—ฐ์„ฑ๊ฑฐ๋™์„ ํ™•๋ณดํ•˜๊ธฐ ์œ„ํ•œ ์ตœ์†Œ ํœจ ์ฒ ๊ทผ๋Ÿ‰ /Resources/kci/JKCI.2018.30.2.179/images/PIC666F.gif๋กœ ์‹ (1)๊ณผ (2) ์ค‘ ํฐ ๊ฐ’์„ ์‚ฌ์šฉํ•˜๋„๋ก ๊ทœ์ •ํ•˜๊ณ  ์žˆ๋‹ค.

Table 1 Minimum flexural reinforcement criteria specified in design codes

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์—ฌ๊ธฐ์„œ, /Resources/kci/JKCI.2018.30.2.179/images/PIC66B0.gif๋Š” ๋ถ€์žฌ์˜ ๋ณต๋ถ€ ํญ(mm), /Resources/kci/JKCI.2018.30.2.179/images/PIC66B1.gif๋Š” ๋ถ€์žฌ์˜ ์œ ํšจ๊นŠ์ด(mm), /Resources/kci/JKCI.2018.30.2.179/images/PIC66B2.gif๋Š” ์ฝ˜ํฌ๋ฆฌํŠธ์˜ ์„ค๊ณ„๊ธฐ์ค€์••์ถ•๊ฐ•๋„(MPa), /Resources/kci/JKCI.2018.30.2.179/images/PIC66C3.gif๋Š” ์ธ์žฅ์ฒ ๊ทผ์˜ ์„ค๊ณ„๊ธฐ์ค€ํ•ญ๋ณต๊ฐ•๋„(MPa)์ด๋‹ค.

์‹ (2)๋Š” ACI 318-95์—์„œ ์ฒ˜์Œ ์ œ์‹œ๋œ ์‹์œผ๋กœ 31 MPa ์ด์ƒ์˜ ์„ค๊ณ„๊ธฐ์ค€์••์ถ•๊ฐ•๋„๋ฅผ ๊ฐ–๋Š” ์ฝ˜ํฌ๋ฆฌํŠธ์— ์ ์šฉํ•  ์ˆ˜ ์žˆ๋Š” ์‹์ด๋‹ค(ACI Committee 318 1995; KCI 2012b). ์ด ์‹์€ ์ตœ์†Œํ•œ์˜ ํœจ ์ฒ ๊ทผ์„ ๋ฐฐ๊ทผํ•˜์—ฌ ์ทจ์„ฑํŒŒ๊ดด๋ฅผ ํ”ผํ•˜๊ณ ์ž ํ•˜๋Š” ๊ฐœ๋…์œผ๋กœ๋ถ€ํ„ฐ ๋„์ถœํ•  ์ˆ˜ ์žˆ๋‹ค. ์ฆ‰ ๋‹จ๋ฉด์˜ ์„ค๊ณ„ํœจ๊ฐ•๋„ /Resources/kci/JKCI.2018.30.2.179/images/PIC66C4.gif์ด ๊ท ์—ด์„ ๋ฐœ์ƒ์‹œํ‚ค๋Š” ๊ท ์—ด๋ชจ๋ฉ˜ํŠธ /Resources/kci/JKCI.2018.30.2.179/images/PIC66C5.gif๋ณด๋‹ค ํฌ๋„๋ก ์„ค๊ณ„ํ•˜์—ฌ ๋ถ€์žฌ์˜ ์—ฐ์„ฑ ๊ฑฐ๋™์„ ํ™•๋ณดํ•˜๋„๋ก ํ•œ๋‹ค. ์ด๋Š” ๋‹ค์Œ ์‹ (3)๊ณผ ๊ฐ™์ด ๋‚˜ํƒ€๋‚ผ ์ˆ˜ ์žˆ๋‹ค.

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์ด๋•Œ /Resources/kci/JKCI.2018.30.2.179/images/PIC66D6.gif์€ ์‹ (4)์™€ ๊ฐ™์ด ๋‚˜ํƒ€๋‚ผ ์ˆ˜ ์žˆ๊ณ  /Resources/kci/JKCI.2018.30.2.179/images/PIC66D7.gif์€ ์‹ (5)์™€ ๊ฐ™์ด ๋‚˜ํƒ€๋‚ผ ์ˆ˜ ์žˆ๋‹ค.

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์‹ (4)์˜ /Resources/kci/JKCI.2018.30.2.179/images/PIC6709.gif๋Š” ์œ ํšจ๊นŠ์ด /Resources/kci/JKCI.2018.30.2.179/images/PIC670A.gif์— ๋Œ€ํ•œ ๋ชจ๋ฉ˜ํŠธ ํŒ” ๊ธธ์ด์˜ ๋น„์œจ์ด๋ฉฐ 0.95๋กœ ๊ฐ€์ •ํ•  ์ˆ˜ ์žˆ๋‹ค. ์‹ (5)๋Š” ์ง์‚ฌ๊ฐํ˜• ๋‹จ๋ฉด์œผ๋กœ๋ถ€ํ„ฐ ์œ ๋„ํ•œ ๊ฒƒ์œผ๋กœ์„œ z๋Š” ๋‹จ๋ฉด๊ณ„์ˆ˜์ด๊ณ  ์ƒ์ˆ˜ /Resources/kci/JKCI.2018.30.2.179/images/PIC670B.gif๋Š” Tํ˜• ๋‹จ๋ฉด ๋“ฑ ๋‹จ๋ฉด ํ˜•์ƒ์„ ๋ณด์ •ํ•˜๊ธฐ ์œ„ํ•œ ๊ณ„์ˆ˜์ด๋‹ค(Seguirant et al. 2010). Seguirant et al.(2010)์— ๋”ฐ๋ฅด๋ฉด /Resources/kci/JKCI.2018.30.2.179/images/PIC671C.gif๋Š” ์ง์‚ฌ๊ฐํ˜• ๋‹จ๋ฉด์— ๋Œ€ํ•ด 1.0์˜ ๊ฐ’์„ ๊ฐ–๊ณ , Tํ˜• ๋‹จ๋ฉด์— ๋Œ€ํ•˜์—ฌ ํ”Œ๋žœ์ง€์— ์••์ถ•์‘๋ ฅ์ด ์ž‘์šฉํ•˜๋Š” ๊ฒฝ์šฐ 1.3~1.6, ํ”Œ๋žœ์ง€์— ์ธ์žฅ์‘๋ ฅ์ด ์ž‘์šฉํ•˜๋Š” ๊ฒฝ์šฐ 3.0~4.0์˜ ๊ฐ’์„ ๊ฐ–๋Š”๋‹ค. ํ•œํŽธ, ์‹ (5)์˜ /Resources/kci/JKCI.2018.30.2.179/images/PIC671D.gif๋Š” ACI 318์—์„œ ๊ทœ์ •ํ•˜๋Š” ์ฝ˜ํฌ๋ฆฌํŠธ์˜ ํŒŒ๊ดด๊ณ„์ˆ˜ /Resources/kci/JKCI.2018.30.2.179/images/PIC671E.gif์ด๋‹ค. ๊ฐ•๋„๊ฐ์†Œ๊ณ„์ˆ˜ /Resources/kci/JKCI.2018.30.2.179/images/PIC672F.gif๋Š” 0.90์œผ๋กœ ACI 318์—์„œ ๊ทœ์ •ํ•˜๊ณ  ์žˆ๋‹ค.

์‹ (4)์™€ (5)๋ฅผ ์‹ (3)์— ๋Œ€์ž…ํ•˜์—ฌ ์ •๋ฆฌํ•˜๋ฉด ๋‹ค์Œ ์‹ (6)์„ ์–ป๋Š”๋‹ค.

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์ด๋ฅผ ์ •๋ฆฌํ•˜๋ฉด ๋‹ค์Œ๊ณผ ๊ฐ™์€ ํœจ ์ตœ์†Œ ์ฒ ๊ทผ๋Ÿ‰ ์‹์ด ๋„์ถœ๋œ๋‹ค.

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์—ฌ๊ธฐ์„œ, ๋ถ€์žฌ์˜ ์ „์ฒด ๊นŠ์ด /Resources/kci/JKCI.2018.30.2.179/images/PIC6752.gif์™€ ์œ ํšจ๊นŠ์ด /Resources/kci/JKCI.2018.30.2.179/images/PIC6753.gif์˜ ๋น„ /Resources/kci/JKCI.2018.30.2.179/images/PIC6773.gif์˜ ๊ฐ’์€ ์ผ๋ฐ˜์ ์œผ๋กœ 1.05~1.2์˜ ๊ฐ’์„ ๊ฐ€์ง€๋ฉฐ, ์ด๋•Œ ๋‹จ๋ฉด ํ˜•์ƒ์— ๋”ฐ๋ฅธ /Resources/kci/JKCI.2018.30.2.179/images/PIC6774.gif์˜ ๊ฐ’์€ Table 2์™€ ๊ฐ™๋‹ค.

์‹ (2)์˜ 0.25๋ฅผ ๊ธฐ์ค€์œผ๋กœ Table 2์˜ /Resources/kci/JKCI.2018.30.2.179/images/PIC6775.gif๊ฐ’๊ณผ ๋น„๊ตํ•ด๋ณด๋ฉด ์ง์‚ฌ๊ฐํ˜• ๋‹จ๋ฉด์— ๋Œ€ํ•˜์—ฌ ์‹ (2)๊ฐ€ 1.42~1.85๋ฐฐ ์ •๋„ ๋” ํฐ ๊ฐ’์„ ๋ณด์ด๋ฉฐ ํ”Œ๋žœ์ง€๊ฐ€ ์••์ถ•์„ ๋ฐ›๋Š” Tํ˜• ๋‹จ๋ฉด์— ๋Œ€ํ•˜์—ฌ ์ตœ๋Œ€ 1.23๋ฐฐ ์ •๋„ ๋” ํฐ ๊ฐ’์„ ๋ณด์ธ๋‹ค. ํ•˜์ง€๋งŒ /Resources/kci/JKCI.2018.30.2.179/images/PIC6786.gif๊ฐ’์ด 0.25๋ฅผ ์ดˆ๊ณผํ•˜๋Š” ๋‹จ๋ฉด์— ๋Œ€ํ•ด์„œ๋Š” ์‹ (2)์— ๋”ฐ๋ฅธ ์ตœ์†Œ ์ฒ ๊ทผ๋Ÿ‰ ๋ฐฐ๊ทผ์œผ๋กœ ์—ฐ์„ฑํŒŒ๊ดด๋ฅผ ๋ณด์žฅํ•  ์ˆ˜ ์—†์Œ์„ ์•Œ ์ˆ˜ ์žˆ๋‹ค. ํ•œํŽธ, Tํ˜• ๋‹จ๋ฉด์˜ ํ”Œ๋žœ์ง€๊ฐ€ ์ธ์žฅ์„ ๋ฐ›๋Š” ๊ฒฝ์šฐ, ์ผ๋ฐ˜์ ์œผ๋กœ /Resources/kci/JKCI.2018.30.2.179/images/PIC6787.gif๋ฅผ 0.50์œผ๋กœ ์ทจํ•˜์—ฌ ์‹ (9)์™€ ๊ฐ™์ด ์ตœ์†Œ ํœจ ์ฒ ๊ทผ๋Ÿ‰์„ ์‚ฐ์ •ํ•  ์ˆ˜ ์žˆ๋‹ค(Seguirant et al. 2010).

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์ด๋Š” KCI, KHBDC, ACI 318 ๋“ฑ์˜ ์„ค๊ณ„๊ธฐ์ค€์—์„œ ํ”Œ๋žœ์ง€๊ฐ€ ์ธ์žฅ์„ ๋ฐ›๋Š” ๊ฒฝ์šฐ์— ๋Œ€ํ•œ ์ตœ์†Œ ํœจ ์ฒ ๊ทผ๋Ÿ‰ ๊ทœ์ •์˜ ๊ทผ๊ฑฐ์ด๋‹ค. ์ด ์„ค๊ณ„๊ธฐ์ค€๋“ค์—์„œ๋Š” ์‹ (1)๊ณผ (2)์˜ /Resources/kci/JKCI.2018.30.2.179/images/PIC6798.gif์— ํ”Œ๋žœ์ง€์˜ ์œ ํšจํญ /Resources/kci/JKCI.2018.30.2.179/images/PIC6799.gif์™€ /Resources/kci/JKCI.2018.30.2.179/images/PIC679A.gif์ค‘ ์ž‘์€ ๊ฐ’์„ ๋Œ€์ž…ํ•˜์—ฌ ๊ณ„์‚ฐํ•˜๋„๋ก ๊ทœ์ •ํ•œ๋‹ค. ์‹ (2)์˜ /Resources/kci/JKCI.2018.30.2.179/images/PIC67AB.gif์— /Resources/kci/JKCI.2018.30.2.179/images/PIC67AC.gif๋ฅผ ๋Œ€์ž…ํ•˜๋ฉด ์‹ (9)๋กœ ์ œ์‹œ๋œ ์ตœ์†Œ ํœจ ์ฒ ๊ทผ๋Ÿ‰๊ณผ ๊ฐ™๊ฒŒ ๋˜์–ด ํ”Œ๋žœ์ง€๊ฐ€ ์ธ์žฅ์„ ๋ฐ›๋Š” ๊ฒฝ์šฐ๋ฅผ ๋Œ€ํ‘œํ•œ๋‹ค๊ณ  ๋ณผ ์ˆ˜ ์žˆ๋‹ค. ํ•˜์ง€๋งŒ ์ด ๊ทœ์ • ๋˜ํ•œ Table 2์—์„œ ๋ณผ ์ˆ˜ ์žˆ๋“ฏ์ด /Resources/kci/JKCI.2018.30.2.179/images/PIC67AD.gif๊ฐ’์ด 0.50์„ ์ดˆ๊ณผํ•˜๋Š” ๊ฒฝ์šฐ์— ๋Œ€ํ•ด์„œ๋Š” ์—ฐ์„ฑํŒŒ๊ดด๋ฅผ ๋ณด์žฅํ•  ์ˆ˜ ์—†๋‹ค.

ํ•œํŽธ, EC2๋Š” 9.2.1.1 ์ ˆ์— ๋‹ค์Œ๊ณผ ๊ฐ™์ด ์ตœ์†Œ ํœจ ์ฒ ๊ทผ๋Ÿ‰์„ ๊ทœ์ •ํ•˜๊ณ  ์žˆ๋‹ค.

Table 2 The value of , adjusting factor for sectional modulus , and for each section

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์—ฌ๊ธฐ์„œ /Resources/kci/JKCI.2018.30.2.179/images/PIC67BF.gif๋Š” ์ธ์žฅ๋ถ€์˜ ํ‰๊ท  ํญ์ด๊ณ  /Resources/kci/JKCI.2018.30.2.179/images/PIC67CF.gif๋Š” ์ธ์žฅ์ฒ ๊ทผ์˜ ์„ค๊ณ„๊ธฐ์ค€ํ•ญ๋ณต๊ฐ•๋„์ด๋‹ค. EC2์—์„œ๋Š” KCI, KHBDC, ACI 318 ๋“ฑ์˜ ๊ทœ์ •๊ณผ ๋‹ฌ๋ฆฌ ์ฝ˜ํฌ๋ฆฌํŠธ์˜ ์„ค๊ณ„๊ธฐ์ค€์••์ถ•๊ฐ•๋„ /Resources/kci/JKCI.2018.30.2.179/images/PIC67D0.gif ๋Œ€์‹  ํ‰๊ท ์ธ์žฅ๊ฐ•๋„ /Resources/kci/JKCI.2018.30.2.179/images/PIC67D1.gif์— ๋Œ€ํ•œ ์‹์œผ๋กœ ํœจ ์ตœ์†Œ ์ฒ ๊ทผ๋Ÿ‰์„ ๊ทœ์ •ํ•˜๊ณ  ์žˆ๋‹ค. ๋”ฐ๋ผ์„œ ์ง์‚ฌ๊ฐํ˜• ๋‹จ๋ฉด์˜ ๊ท ์—ด ๋ชจ๋ฉ˜ํŠธ /Resources/kci/JKCI.2018.30.2.179/images/PIC67E2.gif์€ ๋‹ค์Œ๊ณผ ๊ฐ™์ด ๋‚˜ํƒ€๋‚ผ ์ˆ˜ ์žˆ๋‹ค.

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ํ•œํŽธ, ์‹ (10)์€ KCI, KHBDC, ACI 318 ๊ทœ์ •์˜ ๋„์ถœ๊ณผ์ •๊ณผ ๋‹ค๋ฅด๊ฒŒ ์‹ (3)์˜ /Resources/kci/JKCI.2018.30.2.179/images/PIC67E4.gif ๋Œ€์‹  ์žฌ๋ฃŒ๊ณ„์ˆ˜๋ฅผ ๋„์ž…ํ•œ ๋‹จ๋ฉด์˜ ํœจ ๊ฐ•๋„๋ฅผ ์‚ฌ์šฉํ•œ ์‹ (12)๋กœ๋ถ€ํ„ฐ ๋„์ถœ๋œ๋‹ค(Dahlgren and Svensson 2013).

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์—ฌ๊ธฐ์„œ, ๋ชจ๋ฉ˜ํŠธ ํŒ”๊ณผ ์œ ํšจ๊นŠ์ด์˜ ๋น„๋ฅผ 0.9๋กœ ๊ฐ€์ •ํ–ˆ์Œ์„ ๋ณผ ์ˆ˜ ์žˆ๋‹ค(Park et al. 2014). /Resources/kci/JKCI.2018.30.2.179/images/PIC67F5.gif๋Š” ์ฒ ๊ทผ์˜ ์„ค๊ณ„ํ•ญ๋ณต๊ฐ•๋„๋กœ ์‹ (13)๊ณผ ๊ฐ™์ด ์ •์˜๋˜๋ฉฐ, ์—ฌ๊ธฐ์„œ /Resources/kci/JKCI.2018.30.2.179/images/PIC67F6.gif๋Š” ์ฒ ๊ทผ์˜ ์žฌ๋ฃŒ๊ณ„์ˆ˜๋กœ์จ EC2 ๋Š” 1.15๋ฅผ ์‚ฌ์šฉํ•˜๊ณ  ์žˆ๋‹ค(European Committee for Stan-dardization 2004, 2005; Hendy and Smith 2007; Dahlgren and Svensson 2013).

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์‹ (13)์„ ์‹ (12)์— ๋Œ€์ž…ํ•˜์—ฌ ์ •๋ฆฌํ•˜๋ฉด ๋‹ค์Œ ์‹ (14)๊ณผ ๊ฐ™๋‹ค.

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์ง์‚ฌ๊ฐํ˜• ๋‹จ๋ฉด์— ๋Œ€ํ•˜์—ฌ ์œ ๋„ํ•œ ์‹ (14)๋Š” ๊ทœ์ •์˜ ์‹ (10)๊ณผ ๋™์ผํ•œ ๊ฒฐ๊ณผ๋ฅผ ๋‚˜ํƒ€๋ƒ„์„ ํ™•์ธํ•  ์ˆ˜ ์žˆ๋‹ค.

2.2 ์ˆ˜์ถ•โ€ง์˜จ๋„ ์ฒ ๊ทผ

Table 3์—์„œ ๋ณด๋Š” ๋ฐ”์™€ ๊ฐ™์ด KCI, KHBDC, ACI 318์—์„œ๋Š” ์ˆ˜์ถ•โ€ง์˜จ๋„ ์ฒ ๊ทผ์— ๋Œ€ํ•˜์—ฌ ๊ทœ์ •์„ ํ•˜๊ณ  ์žˆ๋Š”๋ฐ ๋ฐ˜ํ•ด, EC2๋Š” ์ด์— ๋Œ€ํ•œ ๋ณ„๋„์˜ ๊ทœ์ •์„ ๋งˆ๋ จํ•˜๊ณ  ์žˆ์ง€ ์•Š๋‹ค. KCI์—์„œ๋Š” ํœจ ์ฒ ๊ทผ์ด 1๋ฐฉํ–ฅ์œผ๋กœ ๋ฐฐ์น˜๋˜๋Š” ๊ฒฝ์šฐ, ์ด์— ์ง๊ตํ•˜๋Š” ๋ฐฉํ–ฅ์œผ๋กœ ์‹ (15)๊ณผ ๊ฐ™์ด ๊ฒฝํ—˜์— ๊ธฐ๋ฐ˜ํ•œ ์ฒ ๊ทผ๋น„ /Resources/kci/JKCI.2018.30.2.179/images/PIC6819.gif๋ฅผ ์ „์ฒด ์ฝ˜ํฌ๋ฆฌํŠธ ๋‹จ๋ฉด์— ๋Œ€ํ•ด ์ˆ˜์ถ•โ€ง์˜จ๋„ ์ฒ ๊ทผ์œผ๋กœ ๋ฐฐ์น˜ํ•˜๋„๋ก ๊ทœ์ •ํ•˜๊ณ  ์žˆ๋‹ค(KCI 2012a, 2012b).

Table 3 Shrinkage and temperature reinforcement criteria specified in design codes

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์ธ์žฅ์ฒ ๊ทผ์˜ ์„ค๊ณ„๊ธฐ์ค€ํ•ญ๋ณต๊ฐ•๋„๊ฐ€ 400 MPa๋ณด๋‹ค ํด ๋•Œ์—๋Š” ๊ทธ ๊ฐ’์— ๋”ฐ๋ผ ์ฒ ๊ทผ๋น„ /Resources/kci/JKCI.2018.30.2.179/images/PIC682A.gif์˜ ๊ฐ’์„ ์ˆ˜์ •ํ•˜์—ฌ ์ฃผ๋Š”๋ฐ, ์ด๋Š” ์ฒ ๊ทผ์ด ์ตœ์†Œ 0.80 MPa์˜ ์ฝ˜ํฌ๋ฆฌํŠธ ๋‹จ๋ฉด์— ๋ฐœ์ƒํ•˜๋Š” ์ธ์žฅ์‘๋ ฅ์— ์ €ํ•ญํ•  ์ˆ˜ ์žˆ์–ด์•ผ ํ•จ์„ ์˜๋ฏธํ•œ๋‹ค.

ACI 318์—์„œ๋„ ์ด์™€ ์œ ์‚ฌํ•˜๊ฒŒ ์ˆ˜์ถ•โ€ง์˜จ๋„ ์ตœ์†Œ ์ฒ ๊ทผ๋น„๋ฅผ ๊ทœ์ •ํ•˜๊ณ  ์žˆ๋‹ค.

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๋‘ ๊ธฐ์ค€ ๋ชจ๋‘ ์ฒ ๊ทผ๋น„๊ฐ€ 0.0014๋ณด๋‹ค๋Š” ์ปค์•ผ ํ•จ์„ ๊ทœ์ •ํ•˜๊ณ  ์žˆ๋‹ค.

๋‹จ, ์‹ฌํ•˜๊ฒŒ ๊ตฌ์†๋œ ๋ถ€์žฌ์— ๋Œ€ํ•ด์„œ๋Š” ์ตœ์†Œ ์ฒ ๊ทผ๋น„๋ฅผ ์ฆ๊ฐ€์‹œ์ผœ์•ผ ํ•œ๋‹ค๊ณ  ๊ทœ์ •ํ•˜๊ณ  ์žˆ๋‹ค. Gilbert(1992)์— ์˜ํ•˜๋ฉด ์Šฌ๋ž˜๋ธŒ์— ์ž‘์šฉํ•˜๋Š” ๋ชจ๋ฉ˜ํŠธ๊ฐ€ ์ž‘๊ณ  ์ˆ˜์ถ•์ด๋‚˜ ์˜จ๋„๋ณ€ํ™”๋กœ ์ธํ•œ ํšจ๊ณผ๊ฐ€ ๊ตฌ์†๋˜์–ด ์žˆ๋Š” ๊ฒฝ์šฐ, ์ง์ ‘ ์ธ์žฅ์— ์˜ํ•ด ํญ์ด ํฐ ๊ท ์—ด์ด ๋ฐœ์ƒํ•˜๊ธฐ ๋•Œ๋ฌธ์— ๋” ํฐ ์ฒ ๊ทผ๋น„๋กœ ๋ฐฐ์น˜ํ•˜์—ฌ ์ด๋ฅผ ์ œ์–ดํ•˜์—ฌ์•ผ ํ•œ๋‹ค๊ณ  ์„ค๊ณ„๊ธฐ์ค€์—์„œ ์ œ์‹œํ•˜์˜€๋‹ค. ์ด ์—ฐ๊ตฌ์— ๋”ฐ๋ฅด๋ฉด ์‹ฌํ•˜๊ฒŒ ๊ตฌ์†๋œ ๋ถ€์žฌ์— 400 MPa์˜ ํ•ญ๋ณต๊ฐ•๋„๋ฅผ ๊ฐ–๋Š” ์ธ์žฅ์ฒ ๊ทผ์„ 0.01 ๋ณด๋‹ค ํฐ ์ฒ ๊ทผ๋น„๋กœ ๋ฐฐ๊ทผํ•œ ๊ฒฝ์šฐ ์ฒ ๊ทผ์ด ํ•ญ๋ณตํ•˜์ง€ ์•Š๊ณ  ๊ท ์—ด์˜ ์ œ์–ด๊ฐ€ ์ž˜ ๋˜์—ˆ์Œ์„ ๋ณด์—ฌ์ฃผ์—ˆ๋‹ค(Gilbert 1992).

KHBDC์—์„œ๋Š” ๋ถ€์žฌ์˜ ๋‘๊ป˜๊ฐ€ 1200 mm ์ดํ•˜์ธ ๊ฒฝ์šฐ ์‹ (17)๋กœ ๊ทœ์ •ํ•˜๋ฉฐ, ๋‘๊ป˜๊ฐ€ 1200 mm๋ฅผ ์ดˆ๊ณผํ•˜๋Š” ๊ฒฝ์šฐ ์‹ (18)๋กœ ๊ทœ์ •ํ•˜๊ณ  ์žˆ๋‹ค.

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์—ฌ๊ธฐ์„œ, /Resources/kci/JKCI.2018.30.2.179/images/PIC68CB.gif๋Š” ์ตœ์†Œ ์ฒ ๊ทผ ๋‹จ๋ฉด์ , /Resources/kci/JKCI.2018.30.2.179/images/PIC68CC.gif๋Š” ๋ถ€์žฌ์˜ ์ด ๋‹จ๋ฉด์ , /Resources/kci/JKCI.2018.30.2.179/images/PIC68DC.gif๋Š” ์ฒ ๊ทผ ๋˜๋Š” ์ฒ ์„ ์˜ ์ง€๋ฆ„, /Resources/kci/JKCI.2018.30.2.179/images/PIC68DD.gif๋Š” ๋ถ€์žฌํ‘œ๋ฉด์—์„œ ๊ฐ€์žฅ ๊ทผ์ ‘ํ•œ ์ฒ ๊ทผ ๋˜๋Š” ์ฒ ์„ ์˜ ์ค‘์‹ฌ๊นŒ์ง€์˜ ์ฝ˜ํฌ๋ฆฌํŠธ ํ”ผ๋ณต ๋‘๊ป˜์ด๋ฉฐ, /Resources/kci/JKCI.2018.30.2.179/images/PIC68DE.gif๋Š” ์ฒ ๊ทผ ๊ฐ„๊ฒฉ์ด๋‹ค. ์‹ (17)์€ ์‹ (15), (16)๊ณผ ๋งˆ์ฐฌ๊ฐ€์ง€๋กœ ์ฒ ๊ทผ์ด 0.75 MPa์˜ ์ธ์žฅ์‘๋ ฅ์— ์ €ํ•ญํ•  ์ˆ˜ ์žˆ์–ด์•ผ ํ•จ์„ ๊ทœ์ •ํ•˜๋Š” ๊ฒƒ์ด๋‹ค.

ํ•œํŽธ, AASHTO LRFD Bridge Design Specification(American Association of State Highway and Transportation Officials (AASHTO) 2014)์—์„œ๋Š” ๋‹ค์Œ ์‹ (19)๋กœ ์ˆ˜์ถ•โ€ง์˜จ๋„ ์ฒ ๊ทผ์„ ๊ทœ์ •ํ•˜๊ณ  ์žˆ๋‹ค.

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์‹ (19)์—์„œ ๋ณด๋Š” ๋ฐ”์™€ ๊ฐ™์ด ์ง์‚ฌ๊ฐํ˜• ๋‹จ๋ฉด์ ์„ ๋‹จ๋ฉด์˜ ๋‘˜๋ ˆ /Resources/kci/JKCI.2018.30.2.179/images/PIC68F0.gif๋กœ ๋‚˜๋ˆ„์–ด ๋‹จ๋ฉด์˜ ๋‘˜๋ ˆ์˜ ๋‹จ์œ„๊ธธ์ด๋‹น ์ตœ์†Œ ์ฒ ๊ทผ๋Ÿ‰์„ ๊ทœ์ •ํ•˜์˜€๋‹ค. ์‹ (19)์˜ /Resources/kci/JKCI.2018.30.2.179/images/PIC68F1.gifํ•ญ์„ ์†Œ๊ฑฐํ•˜์—ฌ ์ „์ฒด ๋‹จ๋ฉด์— ๋Œ€ํ•œ ์ตœ์†Œ ์ฒ ๊ทผ๋Ÿ‰์œผ๋กœ ์ƒ๊ฐํ•œ๋‹ค๋ฉด ์‹ (17)์€ ์‹ (19)๊ณผ ๊ฐ™์Œ์„ ์•Œ ์ˆ˜ ์žˆ๋‹ค. ๋˜ํ•œ /Resources/kci/JKCI.2018.30.2.179/images/PIC6901.gif๊ฐ€ 420 MPa์ธ ๊ฒฝ์šฐ ์‹ (17)์€ /Resources/kci/JKCI.2018.30.2.179/images/PIC6902.gif๋กœ ํ‘œํ˜„ ๋˜๋ฉฐ(AASHTO 2014), /Resources/kci/JKCI.2018.30.2.179/images/PIC6913.gif๊ฐ€ 400 MPa์ธ ๊ฒฝ์šฐ /Resources/kci/JKCI.2018.30.2.179/images/PIC6914.gif๋กœ ํ‘œํ˜„ ๋œ๋‹ค. 0.0018๊ณผ 0.0019๋Š” ๊ฐ๊ฐ ACI 318๊ณผ KCI์—์„œ ๊ทœ์ •ํ•˜๋Š” ์ฒ ๊ทผ๋น„์™€ ๋™์ผํ•˜๊ฑฐ๋‚˜ ๋งค์šฐ ๊ทผ์ ‘ํ•œ ๊ฐ’์ด๋‹ค. ๋”ฐ๋ผ์„œ KHBDC๊ทœ์ •์€ KCI, ACI 318์˜ ์ˆ˜์ถ•โ€ง์˜จ๋„ ์ฒ ๊ทผ๊ณผ ๊ฐ™์€ ๋„์ถœ ๊ทผ๊ฑฐ๋ฅผ ๊ฐ–๊ณ  ์žˆ๋‹ค๊ณ  ๋ณผ ์ˆ˜ ์žˆ๋‹ค.

ํ•œํŽธ, ๋ถ€์žฌ์˜ ๊นŠ์ด๊ฐ€ 1200 mm ์ด์ƒ์ธ ๋ถ€์žฌ์— ๋Œ€ํ•œ ๊ทœ์ •์ธ ์‹ (18)๋Š” AASHTO LRFD Bridge Design Specification 1998๋…„ ๊ธฐ์ค€(AASHTO 1998)์— ๊ทผ๊ฑฐํ•œ ๊ทœ์ •์ด๋‹ค. ์ด ํ›„ ์„ค๊ณ„๊ธฐ์ค€์—์„œ ์ด ๊ทœ์ •์ด ์‚ญ์ œ๋˜๊ณ  ์‹ (19)๋งŒ ๊ทœ์ •๋˜๊ณ  ์žˆ์œผ๋ฏ€๋กœ KHBDC์—์„œ ์—ฌ์ „ํžˆ ๊ทœ์ •ํ•˜๊ณ  ์žˆ๋Š” ์‹ (18)์˜ ์‹คํšจ์„ฑ์— ๋Œ€ํ•œ ๊ฒ€ํ† ๊ฐ€ ํ•„์š”ํ•˜๋‹ค. EC2์—์„œ๋Š” ์ˆ˜์ถ•โ€ง์˜จ๋„ ์ฒ ๊ทผ์— ๋Œ€ํ•œ ๊ทœ์ •์„ ๋งˆ๋ จํ•˜๊ณ  ์žˆ์ง€ ์•Š๋‹ค. ๊ทธ๋Ÿฌ๋‚˜ ํœจ ์ตœ์†Œ ์ฒ ๊ทผ ๊ทœ์ •์— ํ•˜ํ•œ๊ฐ’ 0.0013/Resources/kci/JKCI.2018.30.2.179/images/PIC6915.gif์„ ๊ทœ์ •ํ•˜์—ฌ ์—ฌ๊ธฐ์— ์ˆ˜์ถ•โ€ง์˜จ๋„ ์ฒ ๊ทผ์˜ ๊ฐœ๋…์„ ํฌํ•จํ•˜๊ณ  ์žˆ๋Š” ๊ฒƒ์œผ๋กœ ๋ณด์ธ๋‹ค. ์‚ฌ์šฉํ•œ๊ณ„์ƒํƒœ(๊ท ์—ด์ œ์–ด) ์ตœ์†Œ ์ฒ ๊ทผ๋Ÿ‰ ๊ทœ์ •์—์„œ๋„ ๊ฑด์กฐ ์ˆ˜์ถ•, ์˜จ๋„์— ์˜ํ•œ ํšจ๊ณผ๋ฅผ ๊ณ ๋ คํ•˜์˜€๊ธฐ ๋•Œ๋ฌธ์— ์ˆ˜์ถ•โ€ง์˜จ๋„ ์ฒ ๊ทผ์— ๋Œ€ํ•œ ๊ทœ์ •์„ ๋ณ„๋„๋กœ ๋งˆ๋ จํ•˜๊ณ  ์žˆ์ง€ ์•Š์€ ๊ฒƒ์œผ๋กœ ํŒ๋‹จ๋œ๋‹ค.

2.3 ์‚ฌ์šฉํ•œ๊ณ„์ƒํƒœ(๊ท ์—ด์ œ์–ด) ์ตœ์†Œ ์ฒ ๊ทผ๋Ÿ‰

KHBDC์™€ EC2์—์„œ๋Š” ์‚ฌ์šฉํ•œ๊ณ„์ƒํƒœ์—์„œ ๊ท ์—ด์„ ์ œ์–ดํ•˜๊ธฐ ์œ„ํ•œ ์ตœ์†Œ ์ฒ ๊ทผ๋Ÿ‰ ๊ทœ์ •์„ ๋‘๊ณ  ์žˆ๋‹ค. ์ด ์ตœ์†Œ ์ฒ ๊ทผ ๊ทœ์ •์„ ๋งŒ์กฑ ์‹œํ‚ฌ ๊ฒฝ์šฐ ๊ท ์—ดํญ์ด ์ œ์–ด ๋˜์—ˆ๋‹ค๊ณ  ๋ณผ ์ˆ˜ ์žˆ๋‹ค(Hendy and Smith 1992; Dahlgren and Svensson 2013; Korean Institute of Bridge and Structural Engineers (KIBSE) 2015). ์ด์— ๋Œ€ํ•˜์—ฌ KHBDC์—์„œ๋Š” ๋‹ค์Œ๊ณผ ๊ฐ™์€ (20)์‹์œผ๋กœ 5.8.3.2์ ˆ์—์„œ ๊ทœ์ •ํ•œ๋‹ค. ๋˜ํ•œ EC 2์—์„œ๋Š” 7.3.2์ ˆ์—์„œ ์‹ (21)๊ณผ ๊ฐ™์ด ์ œ์‹œํ•œ๋‹ค.

/Resources/kci/JKCI.2018.30.2.179/images/PIC6926.gif (20)

/Resources/kci/JKCI.2018.30.2.179/images/PIC6927.gif (21)

์—ฌ๊ธฐ์—์„œ /Resources/kci/JKCI.2018.30.2.179/images/PIC6928.gif๋Š” ์ฒซ ๊ท ์—ด ์ง์ „, ์ธ์žฅ์„ ๋ฐ›๋Š” ์ฝ˜ํฌ๋ฆฌํŠธ ๋‹จ๋ฉด์˜ ๋ฉด์ ์ด๊ณ  /Resources/kci/JKCI.2018.30.2.179/images/PIC6938.gif, /Resources/kci/JKCI.2018.30.2.179/images/PIC6939.gif๋Š” ์ฒซ ๊ท ์—ด ๋ฐœ์ƒ ์งํ›„์— ํ—ˆ์šฉํ•˜๋Š” ์ฒ ๊ทผ์˜ ์ธ์žฅ ์‘๋ ฅ์ด๋ฉฐ /Resources/kci/JKCI.2018.30.2.179/images/PIC693A.gif, /Resources/kci/JKCI.2018.30.2.179/images/PIC694B.gif๋Š” ์ฒซ ๊ท ์—ด์ด ๋ฐœ์ƒํ•  ๋•Œ ์œ ํšจํ•œ ์ฝ˜ํฌ๋ฆฌํŠธ์˜ ์ธ์žฅ๊ฐ•๋„์ด๋‹ค. KHBDC๊ฐ€ EC2์˜ ๊ทœ์ •์— ๊ธฐ๋ฐ˜ํ•˜์˜€๊ธฐ์— ์‹์ด ์œ ์‚ฌํ•œ ํ˜•ํƒœ์ด๋‚˜, /Resources/kci/JKCI.2018.30.2.179/images/PIC694C.gif, /Resources/kci/JKCI.2018.30.2.179/images/PIC694D.gif์— ๋Œ€์ž…๋˜๋Š” /Resources/kci/JKCI.2018.30.2.179/images/PIC695E.gif์˜ ๊ฐ’์„ ๊ฐ ๊ธฐ์ค€์—์„œ ์„œ๋กœ ๋‹ค๋ฅด๊ฒŒ ์ •์˜ํ•˜๊ณ  ์žˆ๊ธฐ ๋•Œ๋ฌธ์— ์ตœ์†Œ ์ฒ ๊ทผ๋Ÿ‰์€ ์ฐจ์ด๋ฅผ ๋ณด์ธ๋‹ค. ์ด ์ตœ์†Œ ์ฒ ๊ทผ๋Ÿ‰ ๊ทœ์ •์€ ๋‹จ๋ฉด์˜ ๊ฐ ์š”์†Œ ์ฆ‰, Tํ˜• ๋‹จ๋ฉด์ด๋‚˜ ๋ฐ•์Šคํ˜• ๋‹จ๋ฉด์˜ ํ”Œ๋žœ์ง€, ๋ณต๋ถ€์— ๋Œ€ํ•˜์—ฌ ๊ฐ๊ฐ ์ ์šฉํ•˜์—ฌ์•ผ ํ•œ๋‹ค.

Hendy and Smith(2007)๊ณผ KIBSE(2015)์— ๋”ฐ๋ฅด๋ฉด ์‹ (20)๊ณผ (21)์—์„œ ๊ณ„์ˆ˜ /Resources/kci/JKCI.2018.30.2.179/images/PIC695F.gif๋Š” ๋‹จ๋ฉด ์‘๋ ฅ๋ถ„ํฌ์˜ ์˜ํ–ฅ์„ ๋‚˜ํƒ€๋‚ด๋Š” ๊ฒƒ์œผ๋กœ, ๋‹จ๋ฉด ๊นŠ์ด ๋ฐฉํ–ฅ์œผ๋กœ ์ธ์žฅ ์‘๋ ฅ์ด ๊ฐ์†Œํ•˜๋Š” ๋ถ„ํฌ๊ฐ€ ๋ฐœ์ƒํ•  ๋•Œ ์†Œ์š” ์ฒ ๊ทผ๋Ÿ‰์„ ์ค„์ผ ์ˆ˜ ์žˆ๋„๋ก ํ•œ๋‹ค. /Resources/kci/JKCI.2018.30.2.179/images/PIC6960.gif๋Š” ์ž์ฒด ํ‰ํ˜• ์‘๋ ฅ์„ ๊ณ ๋ คํ•˜๊ธฐ ์œ„ํ•œ ๊ณ„์ˆ˜๋กœ ๊ฑด์กฐ ์ˆ˜์ถ•์ด๋‚˜ ์˜จ๋„ ์ฐจ์ด๋กœ ์ธํ•œ ๊นŠ์ด๋ฐฉํ–ฅ์˜ ๋ณ€ํ˜•์„ ๋ณด์ •ํ•˜๋Š” ์—ญํ• ์„ ํ•œ๋‹ค. ์ž์ฒด ํ‰ํ˜• ์‘๋ ฅ์— ์˜ํ•ด ๋‹จ๋ฉด์˜ ์™ธ๋ถ€์— ์ธ์žฅ์‘๋ ฅ์ด ๋ฐœ์ƒํ•˜๋ฉด ๋‚ฎ์€ ํ•˜์ค‘์—์„œ๋„ ์‰ฝ๊ฒŒ ๊ท ์—ด์ด ๋ฐœ์ƒํ•œ๋‹ค(Hendy and Smith 2007). ๋”ฐ๋ผ์„œ ๋” ์ ์€ ์ฒ ๊ทผ๋Ÿ‰์œผ๋กœ๋„ ์ด์— ์ €ํ•ญํ•  ์ˆ˜ ์žˆ๊ธฐ ๋•Œ๋ฌธ์— ํ•„์š” ์ฒ ๊ทผ๋Ÿ‰์„ ์ค„์ผ ์ˆ˜ ์žˆ๋Š” ๊ฒƒ์ด๋‹ค.

/Resources/kci/JKCI.2018.30.2.179/images/PIC6970.gif (22)

์‹ (20)๊ณผ (21)์˜ ๋„์ถœ์€ ์‹ (22)์— ๊ทผ๊ฑฐํ•œ๋‹ค. ์ฒซ ๊ท ์—ด์ด ๋ฐœ์ƒํ•  ๋•Œ ์ฒ ๊ทผ์ด ํ•ญ๋ณตํ•˜์ง€ ์•Š๊ฒŒ ํ•˜์—ฌ ๋ณ€ํ˜•์ด ์ง‘์ค‘๋˜๋Š” ๊ฒƒ์„ ๋ฐฉ์ง€ํ•˜์—ฌ ๊ท ์—ด์„ ๋ถ„์‚ฐ ์‹œํ‚ด์œผ๋กœ์จ ํฐ ๊ท ์—ดํญ์„ ๋ฐฉ์ง€ํ•˜๋Š” ๊ฒƒ์ด๋‹ค(Litzner and Becker 1999). Fig. 1์€ ๋‹จ์ฒ ๊ทผ ์ง์‚ฌ๊ฐํ˜• ๋‹จ๋ฉด์— /Resources/kci/JKCI.2018.30.2.179/images/PIC6971.gif์˜ ์ฒ ๊ทผ๋Ÿ‰์„ ๋ฐฐ๊ทผํ•˜์˜€์„ ๋•Œ ๊ท ์—ด ์ „๊ณผ ๊ท ์—ด ํ›„์˜ ๋‹จ๋ฉด ์‘๋ ฅ ๋ถ„ํฌ๋ฅผ ๋ณด์—ฌ์ค€๋‹ค. ๊ท ์—ด ๋ชจ๋ฉ˜ํŠธ /Resources/kci/JKCI.2018.30.2.179/images/PIC6972.gif๊ณผ ์ถ•๋ ฅ /Resources/kci/JKCI.2018.30.2.179/images/PIC6983.gif๊ฐ€ ๋‹จ๋ฉด์— ์ž‘์šฉํ•  ๋•Œ์˜ ๋ชจ๋ฉ˜ํŠธ ํ‰ํ˜•์œผ๋กœ๋ถ€ํ„ฐ ์‹ (20), (21)์˜ /Resources/kci/JKCI.2018.30.2.179/images/PIC6984.gif, /Resources/kci/JKCI.2018.30.2.179/images/PIC6985.gif๋ฅผ ๋„์ถœํ•  ์ˆ˜ ์žˆ๋‹ค(European Concrete Platform 2008).

์ด ๊ทœ์ •์€ ๊ท ์—ด ๋ชจ๋ฉ˜ํŠธ /Resources/kci/JKCI.2018.30.2.179/images/PIC6995.gif์— ๋Œ€ํ•˜์—ฌ ๋ชจ๋ฉ˜ํŠธ ํ‰ํ˜•์„ ์ด์šฉํ•˜์—ฌ ๋„์ถœํ•˜์˜€๊ธฐ ๋•Œ๋ฌธ์— ํœจ ๋ถ€์žฌ์— ์ด๋ฅผ ์ ์šฉ ์‹œํ‚จ๋‹ค๋ฉด 2.1์ ˆ์—์„œ ์‚ดํŽด๋ณธ ๋ฐ”์™€ ๊ฐ™์ด ์•ˆ์ „์œจ์ด ๋น„๊ต์  ํฌ๊ฒŒ ์ ์šฉ๋œ KHBDC์˜ ์ตœ์†Œ ํœจ ์ฒ ๊ทผ๋Ÿ‰ ๊ทœ์ •๊ณผ ์„œ๋กœ ์ƒ์ถฉ๋  ์ˆ˜ ์žˆ๋‹ค. ๋ณด์— ๋Œ€ํ•˜์—ฌ ๊ท ์—ด์ œ์–ด๊ฐ€ ํ•„์š”ํ•œ ๊ฒฝ์šฐ ์ตœ์†Œ ํœจ ์ฒ ๊ทผ๋Ÿ‰๊ณผ ๊ท ์—ด์ œ์–ด๋ฅผ ์œ„ํ•œ ์ตœ์†Œ ์ฒ ๊ทผ๋Ÿ‰ ๊ทœ์ • ์ค‘ ํฐ ๊ฐ’์„ ๋ฐฐ๊ทผํ•˜๋„๋ก 5.12.2.1(1)์—์„œ ๊ทœ์ •ํ•˜๊ณ  ์žˆ๊ธฐ ๋•Œ๋ฌธ์ด๋‹ค. ์ฆ‰, ์ผ๋ฐ˜์ ์ธ ํœจ ๋ถ€์žฌ์— ๋Œ€ํ•˜์—ฌ KHBDC์˜ ๊ท ์—ด์ œ์–ด๋ฅผ ์œ„ํ•œ ์ตœ์†Œ ์ฒ ๊ทผ๋Ÿ‰์€ ์ตœ์†Œ ํœจ ์ฒ ๊ทผ๋Ÿ‰์— ๋น„ํ•ด ๋งค์šฐ ์ž‘์„ ๊ฒƒ์œผ๋กœ ์˜ˆ์ƒํ•  ์ˆ˜ ์žˆ๋‹ค. ์ด์— ๋Œ€ํ•˜์—ฌ 3์žฅ์—์„œ ์‹ค์ œ ์˜ˆ๋ฅผ ํ†ตํ•˜์—ฌ ํ™•์ธํ•˜์˜€๋‹ค.

Table 4 Minimum reinforcement for crack control specified in design codes

/Resources/kci/JKCI.2018.30.2.179/images/Table_CONCRETE_30_2_07_T4.jpg
/Resources/kci/JKCI.2018.30.2.179/images/Figure_CONCRETE_30_2_07_F1.jpg

Fig. 1

Stress distributions for deriving the minimum re-inforcement for crack control

3. ๋‹จ๋ฉด์— ๋Œ€ํ•œ ์ตœ์†Œ ์ฒ ๊ทผ ๋ฐฐ๊ทผ ๋น„๊ต

์ด ์žฅ์—์„œ๋Š” ์•ž์„œ 2์žฅ์—์„œ ์‚ดํŽด๋ณธ ์ตœ์†Œ ์ฒ ๊ทผ๋Ÿ‰ ๊ทœ์ •์„ Fig. 2์™€ ๊ฐ™์€ ์ง์‚ฌ๊ฐํ˜• ๋‹จ๋ฉด๊ณผ Tํ˜• ๋‹จ๋ฉด์— ์ ์šฉํ•˜์—ฌ ๊ทธ ๊ฒฐ๊ณผ๋ฅผ ๋น„๊ตํ•˜์˜€๋‹ค. ์ง์‚ฌ๊ฐํ˜• ๋‹จ๋ฉด์˜ ๊ฒฝ์šฐ, ๋‹จ๋ฉด์˜ ํญ /Resources/kci/JKCI.2018.30.2.179/images/PIC6996.gif๋ฅผ 500 mm๋กœ ๊ณ ์ •ํ•˜๊ณ  ์ „์ฒด ๊นŠ์ด /Resources/kci/JKCI.2018.30.2.179/images/PIC6997.gif์˜ ๊ฐ’์„ 300 mm๋ถ€ํ„ฐ 1000 mm๊นŒ์ง€ 100 mm์”ฉ ๋ณ€ํ™”์‹œ์ผœ ๋ถ„์„ํ•˜์˜€๋‹ค. ์ด๋Š” 2.1 ์ ˆ์˜ KCI, KHBDC, ACI 318 ์ตœ์†Œ ํœจ ์ฒ ๊ทผ๋Ÿ‰ ๊ทœ์ • ๋„์ถœ๊ณผ์ •์—์„œ ๊ณ ๋ คํ•œ /Resources/kci/JKCI.2018.30.2.179/images/PIC69A8.gif์˜ ๋ฒ”์œ„๋ฅผ ๊ณ ๋ คํ•˜๊ธฐ ์œ„ํ•จ์ด๋‹ค. Tํ˜• ๋‹จ๋ฉด์˜ ๊ฒฝ์šฐ ํ”Œ๋žœ์ง€์˜ ์œ ํšจํญ /Resources/kci/JKCI.2018.30.2.179/images/PIC69A9.gif์™€ ํ”Œ๋žœ์ง€์˜ ๋†’์ด /Resources/kci/JKCI.2018.30.2.179/images/PIC69AA.gif๋ฅผ ๊ฐ๊ฐ 1200 mm, 150 mm๋กœ ๊ณ ์ •ํ•˜๊ณ  ์ „์ฒด ๊นŠ์ด /Resources/kci/JKCI.2018.30.2.179/images/PIC69BB.gif์˜ ๊ฐ’์„ 300 mm๋ถ€ํ„ฐ 1000 mm๊นŒ์ง€ 100 mm์”ฉ ์ฆ๊ฐ€์‹œ์ผœ ๋ถ„์„ํ•˜์˜€๋‹ค. ๋˜ํ•œ KS F 4009(2016)์—์„œ ์ •์˜ํ•˜๋Š” 18 MPa๋ถ€ํ„ฐ 60 MPa๊นŒ์ง€์˜ ์ฝ˜ํฌ๋ฆฌํŠธ ์„ค๊ณ„๊ธฐ์ค€์••์ถ•๊ฐ•๋„์— ๋Œ€ํ•˜์—ฌ ๋ถ„์„ํ•˜์˜€๋‹ค. ๋˜ํ•œ KCI์™€ KHBDC์˜ ๊ทœ์ •์„ ๊ธฐ์ค€์œผ๋กœ ๋น„๊ต ํ•˜๊ธฐ ์œ„ํ•ด 400 MPa์˜ ์„ค๊ณ„๊ธฐ์ค€ํ•ญ๋ณต๊ฐ•๋„๋ฅผ ๊ฐ–๋Š” ์ฒ ๊ทผ์„ ๊ฐ€์ •ํ•˜์˜€๋‹ค.

/Resources/kci/JKCI.2018.30.2.179/images/Figure_CONCRETE_30_2_07_F2.jpg

Fig. 2

Typical reinforced concrete sections for analysis of the minimum reinforcement criteria

3.1 ์ตœ์†Œ ํœจ ์ฒ ๊ทผ๋Ÿ‰

Fig. 2์™€ ๊ฐ™์€ ๋‹จ๋ฉด์— ํœจ ์ตœ์†Œ ์ฒ ๊ทผ๋Ÿ‰ /Resources/kci/JKCI.2018.30.2.179/images/PIC69BC.gif์ด ํ”ผ๋ณต๋‘๊ป˜ 50 mm๋กœ ๋ฐฐ๊ทผ๋˜์–ด ์žˆ๋‹ค๊ณ  ๊ฐ€์ •ํ•˜์˜€์œผ๋ฉฐ, KCI, KHBDC, ACI 318์˜ ์‹ (1)๊ณผ (2)์— ๋”ฐ๋ผ ์ตœ์†Œ ์ฒ ๊ทผ๋Ÿ‰์„ ๊ณ„์‚ฐํ•˜์˜€๊ณ , ์•ˆ์ „์œจ์„ ๋น„๊ตํ•˜๊ธฐ ์œ„ํ•ด ๊ณต์นญ ํœจ ๊ฐ•๋„ /Resources/kci/JKCI.2018.30.2.179/images/PIC69BD.gif๊ณผ ๊ท ์—ด ๋ชจ๋ฉ˜ํŠธ /Resources/kci/JKCI.2018.30.2.179/images/PIC69DD.gif์˜ ๋น„๋ฅผ ๋น„๊ตํ•˜์˜€๋‹ค. ๊ทธ ๊ฒฐ๊ณผ๋Š” Fig. 3๊ณผ ๊ฐ™๋‹ค. ์‹ (1)๊ณผ (2)๋ฅผ ์ ์šฉํ•œ ๊ฒฐ๊ณผ, ์ง์‚ฌ๊ฐํ˜• ๋‹จ๋ฉด์˜ ๊ฒฝ์šฐ, ์ตœ์†Œ 1.31์—์„œ ์ตœ๋Œ€ 2.71์˜ ๊ฒฐ๊ณผ๋ฅผ ๋ณด์˜€๊ณ  Tํ˜• ๋‹จ๋ฉด์˜ ๊ฒฝ์šฐ, ํ”Œ๋žœ์ง€์˜ ์œ ํšจํญ /Resources/kci/JKCI.2018.30.2.179/images/PIC69DE.gif๋ฅผ ๋ณ€ํ™” ์‹œํ‚ค๋ฉฐ ํ™•์ธํ•œ ๊ฒฐ๊ณผ, ์ตœ์†Œ 1.17์—์„œ 2.67์˜ ๊ฐ’์„ ๋ณด์˜€๋‹ค.

/Resources/kci/JKCI.2018.30.2.179/images/Figure_CONCRETE_30_2_07_F3.jpg

Fig. 3

Relationship between /Resources/kci/JKCI.2018.30.2.179/images/PIC69DF.gif and /Resources/kci/JKCI.2018.30.2.179/images/PIC69F0.gif (rectangular-shaped) or /Resources/kci/JKCI.2018.30.2.179/images/PIC69F1.gif (T-shaped) when reinforced with the minimum flexural reinforcement according to KCI, KHBDC and ACI 318

Table 2์˜ 0.25 //Resources/kci/JKCI.2018.30.2.179/images/PIC69F2.gif ๊ฐ’์€ ๊ทœ์ •์˜ ์‹์ด ๋„์ž…ํ•˜๊ณ  ์žˆ๋Š” ๋ชจ๋ฉ˜ํŠธ์— ๋Œ€ํ•œ ์•ˆ์ „์œจ์ด๋ผ๊ณ  ๋ณผ ์ˆ˜ ์žˆ๋‹ค. 2.1์ ˆ์—์„œ ๋ณธ 0.25 //Resources/kci/JKCI.2018.30.2.179/images/PIC6A02.gif ๊ฐ’์˜ ๋ฒ”์œ„์˜ ๊ฒฝ์šฐ ๊ทœ์ •๊ฐ’์— ์˜ํ•œ ๋‹จ๋ฉด๊ณผ ์ด๋ก ๊ฐ’์— ์˜ํ•œ ๋‹จ๋ฉด์˜ ๋ชจ๋ฉ˜ํŠธ ํŒ”์˜ ๋น„๊ฐ€ 1.0์— ๊ฐ€๊น๊ธฐ ๋•Œ๋ฌธ์— ์•ˆ์ „์œจ์„ ์ฒ ๊ทผ๋Ÿ‰์˜ ๋น„๋กœ ๊ทผ์‚ฌํ•  ์ˆ˜ ์žˆ๋‹ค. ๋”ฐ๋ผ์„œ Table 2์˜ 0.25 //Resources/kci/JKCI.2018.30.2.179/images/PIC6A03.gif ๊ฐ’์„ Fig. 3์— ์Œ์˜์œผ๋กœ ํ‘œ์‹œํ•˜์˜€๋‹ค. ๋‘ ๊ฒฝ์šฐ ๋ชจ๋‘ ์‹ (2)์˜ ๋„์ถœ๊ณผ์ •์—์„œ ํ™•์ธํ•œ ์ง์‚ฌ๊ฐํ˜• ๋‹จ๋ฉด๊ณผ Tํ˜• ๋‹จ๋ฉด์˜ 0.25 //Resources/kci/JKCI.2018.30.2.179/images/PIC6A04.gif, ์ฆ‰ ์•ˆ์ „์œจ 1.42~ 1.85, 1.23์— ๋น„ํ•ด ํฐ ๊ฐ’์„ ๋ณด์ด๋ฉฐ ๊ณผ๋„ํ•œ ์„ค๊ณ„๋ฅผ ์œ ๋ฐœํ•˜์˜€๋‹ค. ํŠนํžˆ, Tํ˜• ๋‹จ๋ฉด์€ ์‹ (7)์˜ /Resources/kci/JKCI.2018.30.2.179/images/PIC6A15.gif ๊ฐ’ ๋ฒ”์œ„๋กœ ์ธํ•ด ์‹ (2)์— ์˜ํ•œ ๋ฐฐ๊ทผ์ด ์—ฐ์„ฑ๊ฑฐ๋™์„ ๋ณด์žฅํ•˜์ง€ ๋ชปํ•  ์ˆ˜ ์žˆ์„ ๊ฒƒ์œผ๋กœ ์˜ˆ์ƒํ–ˆ์ง€๋งŒ ํฐ ์•ˆ์ „์œจ์„ ๋ณด์—ฌ ๋งค์šฐ ๋ณด์ˆ˜์ ์ธ ์„ค๊ณ„๋ฅผ ์œ ๋„ํ•˜๋Š” ๊ฒƒ์„ ํ™•์ธํ•˜์˜€๋‹ค. ์ด์™€ ๋”๋ถˆ์–ด, /Resources/kci/JKCI.2018.30.2.179/images/PIC6A16.gif, /Resources/kci/JKCI.2018.30.2.179/images/PIC6A17.gif ๋˜๋Š” /Resources/kci/JKCI.2018.30.2.179/images/PIC6A27.gif์— ๋”ฐ๋ผ /Resources/kci/JKCI.2018.30.2.179/images/PIC6A28.gif ๊ฐ’์ด ํฌ๊ฒŒ ๋‹ฌ๋ผ์ง€๋Š” ๊ฒƒ ๋˜ํ•œ ํ™•์ธํ•˜์˜€๋‹ค.

๋ฐ˜๋ฉด, Fig. 4์—์„œ ๋ณด๋“ฏ, EC2์— ์˜ํ•œ ์ตœ์†Œ ํœจ ์ฒ ๊ทผ๋Ÿ‰ ๊ณ„์‚ฐ ๊ฒฐ๊ณผ๋Š” ์ด์™€ ๋‹ค๋ฅธ ํŠน์ง•์„ ๋ณด์˜€๋‹ค. /Resources/kci/JKCI.2018.30.2.179/images/PIC6A29.gif์— ๋”ฐ๋ผ /Resources/kci/JKCI.2018.30.2.179/images/PIC6A3A.gif์˜ ๊ฐ’์— ์ฐจ์ด๊ฐ€ ๋งค์šฐ ์ž‘์•˜๋‹ค. ์‹ (10)์€ /Resources/kci/JKCI.2018.30.2.179/images/PIC6A3B.gif์˜ ์ œ๊ณฑ๊ทผ์˜ ์ƒ์ˆ˜๋ฐฐ์ธ /Resources/kci/JKCI.2018.30.2.179/images/PIC6A4C.gif๋กœ ์ •์˜ ๋œ ACI 318 ๋“ฑ์˜ ๊ทœ์ •๊ณผ ๋‹ฌ๋ฆฌ, /Resources/kci/JKCI.2018.30.2.179/images/PIC6A4D.gif์˜ ์ž์—ฐ๋กœ๊ทธ ๋˜๋Š” 2/3์ œ๊ณฑ์˜ ์ƒ์ˆ˜๋ฐฐ์ธ /Resources/kci/JKCI.2018.30.2.179/images/PIC6A4E.gif์— ๊ด€ํ•œ ์‹์ด๊ธฐ ๋•Œ๋ฌธ์ด๋‹ค. ๋˜ํ•œ, EC2์—์„œ๋Š” ์‹ (1)๊ณผ ๊ฐ™์ด /Resources/kci/JKCI.2018.30.2.179/images/PIC6A5E.gif์— ๋ฌด๊ด€ํ•œ ๊ทœ์ •์ด ์—†๊ธฐ ๋•Œ๋ฌธ์ด๋‹ค.

/Resources/kci/JKCI.2018.30.2.179/images/Figure_CONCRETE_30_2_07_F4.jpg

Fig. 4

Relationship between /Resources/kci/JKCI.2018.30.2.179/images/PIC6A6F.gif and /Resources/kci/JKCI.2018.30.2.179/images/PIC6A70.gif (rectangular-shaped) or /Resources/kci/JKCI.2018.30.2.179/images/PIC6A71.gif (T-shaped) when reinforced with the minimum flexural reinforcement according to EC2

๋˜ํ•œ, /Resources/kci/JKCI.2018.30.2.179/images/PIC6A82.gif, /Resources/kci/JKCI.2018.30.2.179/images/PIC6A83.gif ๊ฐ’์— ๋”ฐ๋ผ /Resources/kci/JKCI.2018.30.2.179/images/PIC6A93.gif ๊ฐ’์˜ ๋ณ€ํ™”๊ฐ€ ์ž‘๊ฒŒ ๋‚˜ํƒ€๋‚ฌ๋‹ค. ์ง์‚ฌ๊ฐํ˜• ๋‹จ๋ฉด์˜ ๊ฒฝ์šฐ, /Resources/kci/JKCI.2018.30.2.179/images/PIC6A94.gif ๊ฐ’์ด 1.0 ๋‚ด์™ธ๋กœ ๋‚˜ํƒ€๋‚˜ ๋งค์šฐ ๊ฒฝ์ œ์ ์ธ ์„ค๊ณ„๋ฅผ ๋„์ถœํ•˜๋Š” ๊ฒƒ์„ ํ™•์ธํ•˜์˜€๋‹ค. ๋ณดํ†ต ํœจ ๋ถ€์žฌ๋กœ ์‚ฌ์šฉํ•˜๋Š” /Resources/kci/JKCI.2018.30.2.179/images/PIC6A95.gif๊ฐ€ 1๋ณด๋‹ค ํฐ ๊ฒฝ์šฐ์— ๋Œ€ํ•ด์„œ๋Š” 1.1์—์„œ 1.2 ์ •๋„์˜ /Resources/kci/JKCI.2018.30.2.179/images/PIC6AA6.gif ๊ฐ’์„ ๋ณด์˜€๋‹ค. Fig. 5์—์„œ ๋ณด๋“ฏ, ์ตœ์†Œ ํœจ ์ฒ ๊ทผ๋Ÿ‰ ๊ด€์ ์—์„œ๋„ EC2์˜ ๊ทœ์ •์— ๋”ฐ๋ฅธ ๊ฐ’์ด KCI, KHBDC, ACI 318์˜ ๊ทœ์ •์— ์˜ํ•œ ๊ฐ’๋ณด๋‹ค ์ƒ๋‹นํžˆ ์ž‘์€ ๊ฒƒ์„ ํ™•์ธํ•  ์ˆ˜ ์žˆ๋‹ค.

/Resources/kci/JKCI.2018.30.2.179/images/Figure_CONCRETE_30_2_07_F5.jpg

Fig. 5

Comparison of flexural minimum reinforcements between ACI 318 (KCI, KHBDC) and EC2 (Rectan-gular sections)

๊ทธ๋Ÿฌ๋‚˜, Tํ˜• ๋‹จ๋ฉด์˜ ๊ฒฝ์šฐ /Resources/kci/JKCI.2018.30.2.179/images/PIC6AA7.gif ๊ฐ’์ด ์•ฝ 0.83์„ ๋ณด์ด๋ฉฐ ๋‹จ๋ฉด์˜ ๊ณต์นญ ํœจ ๊ฐ•๋„๊ฐ€ ๊ท ์—ด ๋ชจ๋ฉ˜ํŠธ์— ํ›จ์”ฌ ๋ชป ๋ฏธ์น˜๋Š” ๊ฒƒ์„ ํ™•์ธํ•˜์˜€๋‹ค. ๋”ฐ๋ผ์„œ EC2์˜ ๊ทœ์ •์€ ์ง์‚ฌ๊ฐํ˜• ๋‹จ๋ฉด์— ๋Œ€ํ•ด์„œ ํƒ€ ์„ค๊ณ„ ๊ธฐ์ค€์˜ ๊ทœ์ •๋ณด๋‹ค ๋งค์šฐ ๊ฒฝ์ œ์ ์ธ ์„ค๊ณ„๋ฅผ ๊ฐ€๋Šฅํ•˜๋„๋ก ํ•  ๊ฒƒ์ด๋‹ค. ํ•˜์ง€๋งŒ, Tํ˜• ๋‹จ๋ฉด์— ๋Œ€ํ•œ ์•ˆ์ „์„ฑ์€ ๊ฒ€์ฆ์„ ํ•ด๋ณผ ํ•„์š”๊ฐ€ ์žˆ๋‹ค.

3.2 ์ˆ˜์ถ•โ€ง์˜จ๋„ ์ฒ ๊ทผ

์ˆ˜์ถ•โ€ง์˜จ๋„ ์ฒ ๊ทผ์€ 2.2์ ˆ์—์„œ ์‚ดํŽด๋ณธ ๋ฐ”์™€ ๊ฐ™์ด ์ฒ ๊ทผ์˜ ์„ค๊ณ„๊ธฐ์ค€ํ•ญ๋ณต๊ฐ•๋„์— ๋”ฐ๋ผ ๊ทธ ๊ฐ’์ด ๋‹ฌ๋ผ์ง„๋‹ค. ๋”ฐ๋ผ์„œ ์—ฌ๊ธฐ์—์„œ๋Š” /Resources/kci/JKCI.2018.30.2.179/images/PIC6AB7.gif์— ๋”ฐ๋ฅธ ์ˆ˜์ถ•โ€ง์˜จ๋„ ์ฒ ๊ทผ๋น„์˜ ์ฐจ์ด๋ฅผ ์‚ดํŽด ๋ณด๊ธฐ ์œ„ํ•ด /Resources/kci/JKCI.2018.30.2.179/images/PIC6AB8.gif๋ฅผ 250 MPa์—์„œ 650 MPa๊นŒ์ง€ 50 MPa์”ฉ ๋ณ€ํ™”์‹œํ‚ค๋ฉฐ ์‚ดํŽด๋ณด์•˜๊ณ  ๊ทธ ๊ฒฐ๊ณผ๋Š” Fig. 6๊ณผ ๊ฐ™๋‹ค. ๋„์ถœ๊ณผ์ •์—์„œ ๋ณด์•˜๋“ฏ์ด KHBDC์˜ ๊ทœ์ •๊ณผ KCI, ACI 318์˜ ๊ทœ์ •์„ ํ†ตํ•œ ์ฒ ๊ทผ๋น„์˜ ๊ฐ’์€ ์ฒ ๊ทผ์˜ ํ•ญ๋ณต๊ฐ•๋„๊ฐ€ 400~550 MPa์ธ ์˜์—ญ์—์„œ ๋น„์Šทํ•จ์„ ๋ณด์˜€๋‹ค. KCI์™€ ACI 318์—์„œ๋Š” ์ฒ ๊ทผ๋น„์˜ ์ƒํ•œ๊ณผ ํ•˜ํ•œ์„ ์ •ํ•˜์˜€๊ธฐ ๋•Œ๋ฌธ์— ์œ„ ์˜์—ญ ์™ธ์˜ ํ•ญ๋ณต๊ฐ•๋„๋ฅผ ๊ฐ–๋Š” ์ฒ ๊ทผ์„ ์‚ฌ์šฉํ•˜์˜€์„ ๋•Œ์—๋Š” KHBDC ๊ทœ์ •๊ณผ ๋‹ค์†Œ ์ฐจ์ด๋ฅผ ๋ณด์ด๊ฒŒ ๋˜๋Š” ๊ฒƒ์ด๋‹ค. 2.2์ ˆ์—์„œ ๋…ผํ•œ๋ฐ”์™€ ๊ฐ™์ด ์ฒ ๊ทผ์˜ ํ•ญ๋ณต๊ฐ•๋„๊ฐ€ 400~550 MPa์ธ ์˜์—ญ์—์„œ ACI 318 ๊ทœ์ •๊ณผ KHBDC ๊ทœ์ •์€ ๊ฐ™์€ ๊ฐ’์„ ๋ณด์˜€๋‹ค.

/Resources/kci/JKCI.2018.30.2.179/images/Figure_CONCRETE_30_2_07_F6.jpg

Fig. 6

Comparison of the shrinkage and temperature re-inforcement between KCI, KHBDC and ACI 318

3.3 ์‚ฌ์šฉํ•œ๊ณ„์ƒํƒœ(๊ท ์—ด์ œ์–ด) ์ตœ์†Œ ์ฒ ๊ทผ๋Ÿ‰

์—„๋ฐ€ํ•œ ๊ณ„์‚ฐ์„ ์œ„ํ•ด ์‹ (20) ๋˜๋Š” (21)์˜ /Resources/kci/JKCI.2018.30.2.179/images/PIC6AB9.gif ๊ฐ’์œผ๋กœ ์ฒซ ๊ท ์—ด ๋ฐœ์ƒ ์งํ›„ ํ—ˆ์šฉํ•˜๋Š” ์ฒ ๊ทผ์˜ ์ธ์žฅ์‘๋ ฅ์„ ์ด์šฉํ•˜์—ฌ์•ผ ํ•œ๋‹ค. ํ•˜์ง€๋งŒ ์ผ๋ฐ˜์ ์œผ๋กœ ์ฒ ๊ทผ์˜ ํ•ญ๋ณต๊ฐ•๋„๋ฅผ ์‚ฌ์šฉํ•  ์ˆ˜ ์žˆ๋‹ค. ์ด๋Š” ์ด ๊ทœ์ •์ด ์‹ (22)์—์„œ ๋ณด๋“ฏ ๊ท ์—ด ๋ฐœ์ƒ ์‹œ ์ฒ ๊ทผ์ด ํ•ญ๋ณตํ•˜์ง€ ์•Š๋Š” ๊ฒƒ์„ ๋ณด์žฅํ•˜๋Š” ๊ฒƒ์ด ๋ชฉ์ ์ด๊ธฐ ๋•Œ๋ฌธ์ด๋‹ค. ๋”ฐ๋ผ์„œ ์ด ์ ˆ์—์„œ๋Š” ํ•ญ๋ณต๊ฐ•๋„๋กœ ์ตœ์†Œ ์ฒ ๊ทผ๋Ÿ‰์„ ๊ตฌํ•˜์˜€๋‹ค. ์ด ๋•Œ, EC2์™€ KHBDC์˜ ๋น„๊ต๋ฅผ ์œ„ํ•ด ์ฒ ๊ทผ์˜ ํ•ญ๋ณต๊ฐ•๋„๋ฅผ 400 MPa๋กœ ๊ฐ€์ •ํ•˜์˜€๋‹ค. ๊ทธ๋ฆฌ๊ณ  2.3์ ˆ์—์„œ ๋…ผํ•œ KHBDC์˜ ์ตœ์†Œ ํœจ ์ฒ ๊ทผ๋Ÿ‰๊ณผ ๊ท ์—ด์ œ์–ด๋ฅผ ์œ„ํ•œ ์ตœ์†Œ ์ฒ ๊ทผ๋Ÿ‰ ๊ทœ์ •์˜ ์ƒ์ถฉ ์—ฌ๋ถ€๋ฅผ ํ™•์ธํ•˜๊ธฐ ์œ„ํ•ด ๋‘ ์ฒ ๊ทผ๋Ÿ‰์„ ๋น„๊ตํ•˜์˜€๋‹ค. ์ˆœ์ˆ˜ ํœจ ์ƒํƒœ์ž„์„ ๊ฐ€์ •ํ•˜์—ฌ /Resources/kci/JKCI.2018.30.2.179/images/PIC6ACA.gif์˜ ๊ฐ’์€ 0.4๋กœ ์„ค์ •ํ•˜์˜€๋‹ค. Figs. 7๊ณผ 8์€ ๊ฐ๊ฐ ๊ณ„์‚ฐ ๊ฒฐ๊ณผ ์ค‘ /Resources/kci/JKCI.2018.30.2.179/images/PIC6ACB.gif๊ฐ€ 35, 40, 55 MPa์ธ ๊ฒฝ์šฐ์— ๋Œ€ํ•ด์„œ KHBDC, EC2์— ์˜ํ•œ ๊ณ„์‚ฐ ๊ฒฐ๊ณผ๋ฅผ ๋‚˜ํƒ€๋‚ธ ๊ฒƒ์ด๋‹ค. ๊ทธ๋ž˜ํ”„์—์„œ ULS๋Š” ํœจ ์ตœ์†Œ ์ฒ ๊ทผ๋Ÿ‰์„ ๋‚˜ํƒ€๋‚ด๋ฉฐ, SLS๋Š” ๊ท ์—ด์ œ์–ด๋ฅผ ์œ„ํ•œ ์ตœ์†Œ ์ฒ ๊ทผ๋Ÿ‰์„ ๋‚˜ํƒ€๋‚ธ๋‹ค.

/Resources/kci/JKCI.2018.30.2.179/images/Figure_CONCRETE_30_2_07_F7.jpg

Fig. 7

Comparison of the minimum reinforcements for crack control and the flexural minimum reinforcement according to KHBDC, by the ratio of /Resources/kci/JKCI.2018.30.2.179/images/PIC6ACC.gif (Rectangular-shaped) and /Resources/kci/JKCI.2018.30.2.179/images/PIC6ACD.gif (T-shaped)

/Resources/kci/JKCI.2018.30.2.179/images/Figure_CONCRETE_30_2_07_F8.jpg

Fig. 8

Comparison of the minimum reinforcements for crack control and the flexural minimum reinforcement according to EC2, by the ratio of /Resources/kci/JKCI.2018.30.2.179/images/PIC6ADE.gif (Rectangular-shaped) and /Resources/kci/JKCI.2018.30.2.179/images/PIC6ADF.gif (T-shaped)

KHBDC์— ์˜ํ•œ ๊ณ„์‚ฐ ๊ฒฐ๊ณผ ๊ฒ€ํ† ํ•œ ๋ชจ๋“  ๊ฒฝ์šฐ์— ๋Œ€ํ•˜์—ฌ, ์ง์‚ฌ๊ฐํ˜• ๋‹จ๋ฉด, Tํ˜• ๋‹จ๋ฉด ๋ชจ๋‘ ์ตœ์†Œ ํœจ ์ฒ ๊ทผ๋Ÿ‰์ด ์ง€๋ฐฐ์ ์ธ ๊ฒƒ์„ ํ™•์ธํ•˜์˜€๋‹ค. EC2์— ์˜ํ•œ ๊ณ„์‚ฐ ๊ฒฐ๊ณผ ์ง์‚ฌ๊ฐํ˜• ๋‹จ๋ฉด์—์„œ /Resources/kci/JKCI.2018.30.2.179/images/PIC6AEF.gif๊ฐ€ 1๋ณด๋‹ค ์ž‘์€ ๊ฒฝ์šฐ์— ๋Œ€ํ•˜์—ฌ ๊ท ์—ด ์ œ์–ด๋ฅผ ์œ„ํ•œ ์ตœ์†Œ ์ฒ ๊ทผ๋Ÿ‰์ด ๋” ํฐ ๊ฒฝ์šฐ๊ฐ€ ์žˆ์—ˆ์œผ๋‚˜, ๋Œ€๋ถ€๋ถ„์˜ ๊ฒฝ์šฐ์—์„œ๋Š” ์ตœ์†Œ ํœจ ์ฒ ๊ทผ๋Ÿ‰์ด ์ง€๋ฐฐ์ ์ด์—ˆ๋‹ค. ํ•˜์ง€๋งŒ ๋‘ ์ตœ์†Œ ์ฒ ๊ทผ๋Ÿ‰ ํฌ๊ธฐ์˜ ์ฐจ์ด๋Š” EC2์—์„œ๋ณด๋‹ค KHBDC์—์„œ ๋” ํฐ ๊ฐ’์„ ๋‚˜ํƒ€๋‚ด์—ˆ๋‹ค. ์ด๋Š” 2.1์ ˆ๊ณผ 2.3์ ˆ์—์„œ ๊ธฐ์ˆ ํ•œ ๋ฐ”์™€ ๊ฐ™์ด KHBDC์˜ ํœจ ์ตœ์†Œ ์ฒ ๊ทผ๋Ÿ‰์€ KCI, ACI 318์˜ ๊ทœ์ •์„ ๊ทธ๋Œ€๋กœ ์ ์šฉํ•œ ๊ฒฐ๊ณผ์ด๋‹ค.

๊ณ„์‚ฐ ๊ฒฐ๊ณผ์™€ ๊ฐ™์ด KHBDC, EC2 ๋ชจ๋‘ ๊ฒ€ํ† ํ•œ ๋‹จ๋ฉด์— ๋Œ€ํ•ด์„œ๋Š” ์ผ๋ฐ˜์ ์ธ ํœจ ๋ถ€์žฌ์˜ ๊ฒฝ์šฐ ์‚ฌ์šฉํ•œ๊ณ„์ƒํƒœ ๊ทœ์ •์ด ํ•„์š”ํ•˜์ง€ ์•Š์•˜๋‹ค. ํ•˜์ง€๋งŒ EC2์˜ ๊ฒฝ์šฐ, ํ”Œ๋žœ์ง€์— ์ธ์žฅ ์‘๋ ฅ์ด ๋ฐœ์ƒํ•˜๋Š” ๋ถ€์žฌ ๋˜๋Š” ์ถ•๋ ฅ์ด ์ž‘์šฉํ•˜์—ฌ /Resources/kci/JKCI.2018.30.2.179/images/PIC6AF0.gif๊ฐ€ 0.4๋ณด๋‹ค ํฐ ๊ฐ’์„ ๋‚˜ํƒ€๋‚ด๋Š” ๋ถ€์žฌ์— ๋Œ€ํ•ด ์ตœ์†Œ ํœจ ์ฒ ๊ทผ๋Ÿ‰ ๋ณด๋‹ค ๊ท ์—ด์ œ์–ด๋ฅผ ์œ„ํ•œ ์ตœ์†Œ ์ฒ ๊ทผ๋Ÿ‰์ด ๋” ํฐ ๊ฐ’์„ ๋‚˜ํƒ€๋‚ผ ์ˆ˜ ์žˆ๋‹ค. ์ด ๊ฒฝ์šฐ, 3.1์ ˆ์—์„œ ๋…ผํ•˜์˜€๋˜ EC2 ์ตœ์†Œ ํœจ ์ฒ ๊ทผ๋Ÿ‰์˜ ์•ˆ์ „์„ฑ ๋ฌธ์ œ๋ฅผ ๋ณด์™„ํ•  ์ˆ˜ ์žˆ๋Š” ๊ฒƒ์œผ๋กœ ๋ณด์ธ๋‹ค.

4. ๊ฒฐ    ๋ก 

๋ณธ ์—ฐ๊ตฌ์—์„œ๋Š” ๋จผ์ € KCI, KHBDC, ACI 318, EC2 ๋“ฑ ๊ตญ๋‚ด์™ธ ์„ค๊ณ„ ๊ธฐ์ค€ ๋‚ด ์ตœ์†Œ ์ฒ ๊ทผ ๊ทœ์ •์— ๋Œ€ํ•˜์—ฌ ๊ฒ€ํ†  ํ•˜์˜€๋‹ค. ๊ฐ ๊ทœ์ •์— ๋Œ€ํ•œ ๋„์ถœ ๊ทผ๊ฑฐ ๋ถ„์„๊ณผ ๋‹จ๋ฉด์— ๋Œ€ํ•œ ๊ณ„์‚ฐ ๊ฒฐ๊ณผ, ๊ฒฐ๋ก ์€ ๋‹ค์Œ๊ณผ ๊ฐ™๋‹ค.

1)์ตœ์†Œ ์ฒ ๊ทผ ๊ทœ์ •์˜ ๋ชฉ์ ์— ๋”ฐ๋ผ ์ตœ์†Œ ํœจ ์ฒ ๊ทผ๋Ÿ‰, ์ˆ˜์ถ•โ€ง์˜จ๋„ ์ฒ ๊ทผ, ๊ท ์—ด์ œ์–ด๋ฅผ ์œ„ํ•œ ์ตœ์†Œ ์ฒ ๊ทผ๋Ÿ‰ ์„ธ๊ฐ€์ง€๋กœ ๋‚˜๋ˆŒ ์ˆ˜ ์žˆ์—ˆ๋‹ค.

2)์ตœ์†Œ ํœจ ์ฒ ๊ทผ๋Ÿ‰์˜ ๊ฒฝ์šฐ ACI 318์— ๊ทผ๊ฑฐํ•œ KCI, KHBDC ๋“ฑ์˜ ๊ทœ์ •์€ EC2์˜ ๊ทœ์ •์— ๋น„ํ•ด ํฐ ๋ชจ๋ฉ˜ํŠธ์— ๋Œ€ํ•œ ์•ˆ์ „์œจ์„ ๋„์ž…ํ•˜๊ณ  ์žˆ์—ˆ๋‹ค. ์‹ค์ œ ์ง์‚ฌ๊ฐํ˜•, Tํ˜• ๋‹จ๋ฉด์— ๋Œ€ํ•œ ๊ณ„์‚ฐ ๊ฒฐ๊ณผ ACI 318 ๋“ฑ์˜ ๊ธฐ์ค€์—์„œ ์ •ํ•œ ๊ทœ์ •์˜ ์•ˆ์ „์œจ์€ ๋„์ถœ ๊ณผ์ •์—์„œ ์‚ดํŽด ๋ณธ ์•ˆ์ „์œจ์— ๋น„ํ•ด ํฐ ๊ฐ’์„ ๋‚˜ํƒ€๋‚ด์—ˆ๋‹ค.

3)EC2์˜ ์ตœ์†Œ ํœจ ์ฒ ๊ทผ๋Ÿ‰ ๊ทœ์ •์˜ ๊ฒฝ์šฐ ๋„์ถœ ๊ณผ์ •์—์„œ ๋ณธ ๋ฐ”์™€ ๊ฐ™์ด ๊ณ„์‚ฐ ๊ฒฐ๊ณผ ๋˜ํ•œ ์ž‘์€ ์•ˆ์ „์œจ์„ ๋ณด์˜€์œผ๋ฉฐ ACI 318๋“ฑ์˜ ๊ทœ์ •์— ๋น„ํ•ด ํ‰๊ท  0.57๋ฐฐ ์ •๋„์˜ ์ฒ ๊ทผ๋Ÿ‰์„ ๋ณด์˜€๋‹ค. ์ด๋Š” KCI, KHBDC, ACI 318์˜ ๊ทœ์ •์— ๋น„ํ•ด ๊ฒฝ์ œ์ ์ธ ์„ค๊ณ„๋ฅผ ์œ ๋„ํ•˜๋‚˜ ์ผ๋ถ€์—์„œ๋Š” /Resources/kci/JKCI.2018.30.2.179/images/PIC6AF1.gif์ด 1๋ณด๋‹ค ์ž‘์€ ๊ฒฐ๊ณผ๋„ ๋ณด์˜€๋‹ค. EC2์˜ ์ตœ์†Œ ์ฒ ๊ทผ๋Ÿ‰์„ ๋ฐฐ๊ทผํ•˜์˜€์„ ๋•Œ ์—ฐ์„ฑ๊ฑฐ๋™์— ๋Œ€ํ•œ ์‹คํ—˜์ , ํ•ด์„์  ๊ฒ€์ฆ์ด ํ•„์š”ํ•  ๊ฒƒ์œผ๋กœ ๋ณด์ธ๋‹ค.

4)์ˆ˜์ถ•โ€ง์˜จ๋„ ์ฒ ๊ทผ ๊ทœ์ •์˜ ๊ฒฝ์šฐ KCI, KHBDC, ACI 318์—์„œ ๊ทœ์ •ํ•˜๊ณ  ์žˆ๋Š”๋ฐ, ๋ชจ๋‘ ๊ฐ™์€ ๊ทผ๊ฑฐ๋ฅผ ๊ฐ–๊ณ  ๋„์ถœ๋œ ์‹์ด๋‹ค.

5)KHBDC์˜ ๊ฒฝ์šฐ, ACI 318์— ๊ทผ๊ฑฐํ•œ ์ตœ์†Œ ํœจ ์ฒ ๊ทผ๋Ÿ‰์„ ์‚ฌ์šฉํ•˜๊ธฐ ๋•Œ๋ฌธ์— ๊ท ์—ด์ œ์–ด๋ฅผ ์œ„ํ•œ ์ตœ์†Œ ์ฒ ๊ทผ๋Ÿ‰์˜ ๊ฒ€ํ† ๊ฐ€ ๋ฌด์˜๋ฏธํ•˜์˜€๋‹ค.

6)EC2์˜ ๊ท ์—ด์ œ์–ด๋ฅผ ์œ„ํ•œ ์ตœ์†Œ ์ฒ ๊ทผ๋Ÿ‰์€ ํ”Œ๋žœ์ง€์— ์ธ์žฅ์‘๋ ฅ์„ ๋ฐ›๋Š” ๊ฒฝ์šฐ ๋˜๋Š” ๋‹จ๋ฉด์— ์ถ•๋ ฅ์ด ์ž‘์šฉํ•˜๋Š” ๊ฒฝ์šฐ, ๊ท ์—ด์ œ์–ด๋ฅผ ์œ„ํ•œ ์ตœ์†Œ ์ฒ ๊ทผ๋Ÿ‰์ด ์ง€๋ฐฐ์ ์ผ ์ˆ˜ ์žˆ์Œ์„ ํ™•์ธํ•˜์˜€๋‹ค. EC2์˜ ์ตœ์†Œ ํœจ ์ฒ ๊ทผ๋Ÿ‰์˜ ์•ˆ์ „์„ฑ์„ ๋ณด์™„ํ•˜๋Š” ์—ญํ• ์„ ํ•  ์ˆ˜ ์žˆ๋Š” ๊ฒƒ์œผ๋กœ ๋ณด์ธ๋‹ค.

7)๊ฐ•๋„์„ค๊ณ„๋ฒ•์— ๊ธฐ๋ฐ˜ํ•œ KHBDC์˜ ์ตœ์†Œ ํœจ ์ฒ ๊ทผ๋Ÿ‰ ๊ทœ์ •์€ ๋‹ค์†Œ ๋ณด์ˆ˜์ ์ด๋ผ ํ•  ์ˆ˜ ์žˆ๋‹ค. /Resources/kci/JKCI.2018.30.2.179/images/PIC6B02.gif, /Resources/kci/JKCI.2018.30.2.179/images/PIC6B03.gif, /Resources/kci/JKCI.2018.30.2.179/images/PIC6B04.gif์— ๋Œ€ํ•˜์—ฌ ์„œ๋กœ ์ƒ์ดํ•œ ์•ˆ์ „์œจ์„ ๋ณด์ธ๋‹ค๋Š” ์  ๋˜ํ•œ ๊ทœ์ •์ƒ ๋ฌธ์ œ์ ์œผ๋กœ ๋ณผ ์ˆ˜ ์žˆ์œผ๋ฉฐ ์ด์— ๋Œ€ํ•œ ๋”์šฑ ๋ฉด๋ฐ€ํ•œ ๊ฒ€ํ† ๊ฐ€ ํ•„์š”ํ•  ๊ฒƒ์ด๋‹ค.

Acknowledgements

์ด ์—ฐ๊ตฌ๋Š” ํ•œ๊ตญ์—ฐ๊ตฌ์žฌ๋‹จ BK21 PLUS ์‚ฌ์—…์˜ ์ง€์›์„ ๋ฐ›์•„ ์ˆ˜ํ–‰๋œ ์—ฐ๊ตฌ์ž…๋‹ˆ๋‹ค. ๋ณธ ์—ฐ๊ตฌ๋Š” ์„œ์šธ๋Œ€ํ•™๊ต ๊ฑด์„คํ™˜๊ฒฝ์ข…ํ•ฉ์—ฐ๊ตฌ์†Œ์˜ ์ง€์›์œผ๋กœ ์ˆ˜ํ–‰๋˜์—ˆ์Šต๋‹ˆ๋‹ค. ์—ฐ๊ตฌ์ง€์›์— ๊ฐ์‚ฌํ•ฉ๋‹ˆ๋‹ค.

References

1 
ACI Committee 318 (1995) Building Code Requirements for Structural Concrete (ACI 318-95) and Commentary (ACI 318R-95). Farmington Hills, MI: American Concrete Institute.Google Search
2 
ACI Committee 318 (2014) Building Code Requirements for Structural Concrete (ACI 318-14) and Commentary (ACI 318R-14). Farmington Hills, MI: American Concrete Institute.Google Search
3 
American Association of State Highway and Transportation Officials (AASHTO) (1998) AASHTO LRFD Bridge Design Speci-fication. 2nd edition. Washington, D.C.: AASHTO.Google Search
4 
American Association of State Highway and Transportation Officials (AASHTO) (2014) AASHTO LRFD Bridge Design Speci-fication. 7th edition. Washington, D.C.: AASHTO.Google Search
5 
Dahlgren, A. and Svensson, L. (2013) Guidelines and rules for detailing of reinforcement in concrete structures: A compilation and evaluation of ambiguities in Eurocode 2. M.S. Thesis, Chalmers University of Technology. 48-52.Google Search
6 
European Committee for Standardization (2004) Eurocode 2: Design of Concrete Structures โ€“ Part 1-1: General Rules and Rules for Buildings. Brussels: CEN.Google Search
7 
European Committee for Standardization (2005) Eurocode 2: Design of Concrete Structures โ€“ Part 2: Concrete Bridges- Design and Detailing Rules. Brussels: CEN.Google Search
8 
European Concrete Platform (2008) Commentary to Eurocode 2. Brussels: ASBL.Google Search
9 
Gilbert, R. I. (1992) Shrinkage Cracking in Fully Restrained Concrete Members. ACI Structural Journal 89(2), 141-149.Google Search
10 
Hendy, C. R. and Smith, D. A. (2007) Designersโ€™ Guide to EN 1992-2, Eurocode 2: Design of Concrete Structures. Part 2: Concrete Bridges. London: Thomas Telford Publishing.DOI
11 
Korea Concrete Institute (KCI) (2012a) Korea Structural Concrete Design Code 2012. Sejong: Ministry of Land, Transport and Maritime Affairs. (In Korean)Google Search
12 
Korea Concrete Institute (KCI) (2012b) Korea Structural Concrete Design Code 2012 Commentary. Seoul: Kimoondang. (In Korean)Google Search
13 
Korea Institute of Bridge and Structural Engineering (KIBSE) (2015) Korean Highway Bridge Design Code (Limit State Design) Commentary. Seoul: Geonseoljeongbosa. (In Korean)Google Search
14 
Korean Road Association (2016) Korean Highway Bridge Design Code (Limit State Design)(KHBDC). Sejong: Ministry of Land, Infrastructure and Transport. (In Korean)Google Search
15 
KS F 4009 (2016) Ready-Mixed Concrete. Eumseong: Korean Agency for Technology and Standards. 3. (In Korean)Google Search
16 
Lee, H.-J. (2016) Investigation on the Minimum Reinforcement Ratio for RC Flexural Members. In Fall Conference on Structural Maintenance and Inspection, Daejeon 12-14 October 2016. Seoul: Korea Institute for Structural Main-tenance and Inspection. 175-178. (In Korean)Google Search
17 
Litzner, H.-U. and Becker, A. (1999) Design of Concrete Struc-tures for Durability and Strength to Eurocode 2. Materials and Structures 32, 323-330.DOI
18 
Nilson, A. H., Darwin, D., and Dolan, C. W. (2010) Desing of Concrete Structures. 14th edition. New York: McGraw-Hill Higher Education.Google Search
19 
Park, S.-J., Kang, T.-S., and Moon, D.-Y. (2014) A Study on the Flexural Minimum Reinforcement for Prevention of Brittle Failure Specified in KCI and EN Codes. Journal of the Korea Concrete Institute 26, 211-218. (in Korean)DOI
20 
Seguirant, S. J., Brice, R., and Khaleghi, B. (2010) Making Sense of Minimum Flexural Reinforcement Requirements for Reinforced Concrete Members. PCI Journal 55(3), 61-85.DOI