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์šฉ์ ‘๊ฒน์นจ์ด์Œ, ์šฉ์ ‘๊ธธ์ด, ์šฉ์ ‘์ด์Œ๊ฐ•๋„, ์šฉ์ ‘๋ถ€ํŒŒ๊ดด, ์šฉ์ ‘์žฌ๋ฃŒ
welded lap splice, welding length, strength of welded lap splice, fracture of weld, welding material

  • 1. ์„œ ๋ก 

  • 2.์šฉ์ ‘ ๊ฒน์นจ์ด์Œ์— ๋Œ€ํ•œ ๋ฌธํ—Œ์—ฐ๊ตฌ

  •   2.1 ์ฝ˜ํฌ๋ฆฌํŠธ๊ตฌ์กฐ๊ธฐ์ค€(KCI 2012)

  •   2.2 KS B ISO 17660-1(KSA 2007)

  •   2.3 KS D 3504(KSA 2016)

  •   2.4 KEPIC SNC ์ฒ ๊ทผ์ฝ˜ํฌ๋ฆฌํŠธ ๊ตฌ์กฐ(KEPIC 2015)

  •   2.5 ACI 318-14(ACI Committee 318 2014)

  •   2.6 AWS D1.4(AWS 2011)

  •   2.7 Kim et al.(2011)

  •   2.8 Nikolaou and Papadimitriou(2004)

  • 3. ์‹œํ—˜๊ณ„ํš

  •   3.1 ์‹œํ—˜ ๋ณ€์ˆ˜

  •   3.2 ์‹œํ—˜์ฒด ์„ค๊ณ„

  •   3.3 ์‹œํ—˜์ฒด ์ œ์ž‘

  • 4. ์‹œํ—˜ ๊ฒฐ๊ณผ

  •   4.1 ์žฌ๋ฃŒ์‹œํ—˜ ๊ฒฐ๊ณผ

  •   4.2 ํŒŒ๊ดด์œ ํ˜•๊ณผ ์ตœ๋Œ€๊ฐ•๋„

  • 5. ์ด์Œ๊ฐ•๋„ ํ‰๊ฐ€

  •   5.1 ์šฉ์ ‘๊ธธ์ด ๋ฐ ์˜ˆ์—ด์œ ๋ฌด์˜ ์˜ํ–ฅ

  •   5.2 ๊ฐ•์ข…์˜ ์˜ํ–ฅ

  •   5.3 ์ฒ ๊ทผ ์ง€๋ฆ„์˜ ์˜ํ–ฅ

  •   5.4 ์„ค๊ณ„๊ธฐ์ค€์— ๋”ฐ๋ฅธ ์šฉ์ ‘๊ฐ•๋„์™€ ๋น„๊ต

  •   5.5 ์šฉ์ ‘์ด์Œ์˜ ์•ˆ์ „์œจ ํ‰๊ฐ€

  • 6. ๊ฒฐ ๋ก 

1. ์„œ    ๋ก 

์ฒ ๊ทผ์ฝ˜ํฌ๋ฆฌํŠธ ๊ตฌ์กฐ๋ฌผ์—์„œ ์ฒ ๊ทผ ์ด์Œ์€ ๊ฒน์นจ์ด์Œ์„ ๊ธฐ๋ณธ์œผ๋กœ ์šฉ์ ‘์ด์Œ๊ณผ ๊ธฐ๊ณ„์ ์ด์Œ์ด ์‚ฌ์šฉ๋˜๊ณ  ์žˆ๋‹ค. ์ฒ ๊ทผ์ด์Œ ๋ฐฉ๋ฒ•์€ ๊ตฌ์กฐ๋ฌผ์˜ ์ข…๋ฅ˜, ์ฒ ๊ทผ๊ณผ ์ฝ˜ํฌ๋ฆฌํŠธ์˜ ๊ฐ•๋„, ์ฒ ๊ทผ ์ง€๋ฆ„, ๊ทธ๋ฆฌ๊ณ  ์ฒ ๊ทผ๊ฐ€๊ฒฉ์„ ๊ทผ๊ฑฐ๋กœ ๊ฐ€์žฅ ํšจ์œจ์ ์ธ ๋ฐฉ๋ฒ•์ด ์„ ์ •๋œ๋‹ค.

์šฉ์ ‘์ด์Œ์€ KS B ISO 17660-1 ์šฉ์ ‘-์ฒ ๊ทผ ์šฉ์ ‘- ์ œ1๋ถ€ : ํ•˜์ค‘์„ ๋ฐ›๋Š” ์šฉ์ ‘ ์ด์Œ(KSA 2007)์— ์šฉ์ ‘๋ฐฉ๋ฒ•๊ณผ ์‹œํ—˜๋ฐฉ๋ฒ•์ด ๊ทœ์ •๋˜์–ด ์žˆ๋‹ค. ์šฉ์ ‘๋ฐฉ๋ฒ•์€ ํฌ๊ฒŒ ๋งž๋Œ€๊ธฐ์ด์Œ, ๊ฒน์นจ์ด์Œ, ๊ทธ๋ฆฌ๊ณ  ๋ ์ด์Œ์œผ๋กœ ๊ตฌ๋ถ„๋œ๋‹ค. ๋˜ํ•œ ์šฉ์ ‘์ด์Œ์€ KS D3504(KSA 2016)์— ๊ทœ์ •๋œ ์šฉ์ ‘์šฉ ์ฒ ๊ทผ SD400W, SD500W์™€ SD300์— ๋Œ€ํ•ด ํ—ˆ์šฉ๋œ๋‹ค. ์šฉ์ ‘์ด ๊ฐ€๋Šฅํ•œ ์ฒ ๊ทผ์„ ๋ณ„๋„ ๊ทœ์ •ํ•œ ์ด์œ ๋Š” ์ผ๋ฐ˜ ์ฒ ๊ทผ์€ ์šฉ์ ‘์šฉ ๊ฐ•์žฌ์— ๋น„ํ•ด ํƒ„์†Œ๋‹น๋Ÿ‰(Carbon equivalent)์ด ๋†’์•„ ์šฉ์ ‘์„ฑ์ด ์ €ํ•˜๋˜๊ธฐ ๋•Œ๋ฌธ์ด๋‹ค. ๋˜ํ•œ ์—ด์ฒ˜๋ฆฌ์— ์˜ํ•ด ๊ฐ•๋„๋ฅผ ํ–ฅ์ƒ์‹œํ‚จ ์ฒ ๊ทผ์˜ ๊ฒฝ์šฐ, ์šฉ์ ‘ ํ›„ ๊ณต๊ธฐ ์ค‘์—์„œ ์„œ๋ƒ‰(ๅพๅ†ท)๋˜๋ฉด ํ’€๋ฆผ(annealing)์— ์˜ํ•ด ๊ฐ•๋„๊ฐ€ ์ €ํ•˜๋  ๊ฐ€๋Šฅ์„ฑ์ด ์žˆ๋‹ค. ๊ทธ๋Ÿฌ๋ฏ€๋กœ ์ฝ˜ํฌ๋ฆฌํŠธ๊ตฌ์กฐ๊ธฐ์ค€(KCI 2012)์—์„œ๋Š” SD300๊ณผ ์šฉ์ ‘์šฉ ์ฒ ๊ทผ์— ๋Œ€ํ•ด์„œ๋งŒ ์šฉ์ ‘์ด์Œ์„ ํ—ˆ์šฉํ•˜๊ณ  ์žˆ๋‹ค. ๋˜ํ•œ ์ฒ ๊ทผ ๊ฒน์นจ์ด์Œ์— ๋น„ํ•ด ์šฉ์ ‘์ด์Œ์€ ์šฉ์ ‘๊ณผ ๊ฒ€์‚ฌ ์ž‘์—…์—์„œ ๋น„์šฉ์ด ๋งŽ์ด ์†Œ์š”๋˜๋ฏ€๋กœ, ์ผ๋ฐ˜์ ์ธ ์‹ ์ถ•๊ณต์‚ฌ์—์„œ๋Š” ๊ฒน์นจ์ด์Œ์ด ์ฃผ๋กœ ์‚ฌ์šฉ๋œ๋‹ค.

๊ทธ๋Ÿฌ๋‚˜ ๊ธฐ์กด ๊ตฌ์กฐ๋ฌผ์˜ ์ฆ์ธก ๋˜๋Š” ๋ณด์ˆ˜๋ณด๊ฐ•์—์„œ ๊ธฐ์กด ์ฒ ๊ทผ์— ์ฒ ๊ทผ์„ ์ž‡๊ธฐ ์œ„ํ•ด์„œ๋Š” ๋งŽ์€ ๋ถ€์œ„์˜ ์ฝ˜ํฌ๋ฆฌํŠธ๋ฅผ ์ œ๊ฑฐํ•ด์•ผํ•œ๋‹ค. ์ด ๊ณผ์ •์—์„œ ๊ธฐ์กด ๊ตฌ์กฐ๋ฌผ์˜ ์•ˆ์ „์„ฑ์ด ์ €ํ•˜๋  ์šฐ๋ ค๊ฐ€ ์žˆ๊ณ  ์ฝ˜ํฌ๋ฆฌํŠธ ์ œ๊ฑฐ ์ž‘์—…์— ๊ณผ๋„ํ•œ ๋น„์šฉ์ด ๋ฐœ์ƒ๋œ๋‹ค. ์ด๋Ÿฌํ•œ ๋ถ€์œ„์— ์šฉ์ ‘ ๊ฒน์นจ์ด์Œ์œผ๋กœ ์‹ ๊ตฌ ์ฒ ๊ทผ์„ ์ด์œผ๋ฉด ๊ธฐ์กด ๊ตฌ์กฐ๋ฌผ์˜ ์ฝ˜ํฌ๋ฆฌํŠธ ์ œ๊ฑฐ๋ฅผ ์ตœ์†Œํ™”ํ•  ์ˆ˜ ์žˆ์–ด, ์•ˆ์ „์„ฑ๊ณผ ๊ฒฝ์ œ์„ฑ ํ–ฅ์ƒ์— ๋„์›€์ด ๋œ๋‹ค. ๊ทธ๋Ÿฌ๋‚˜ ์šฉ์ ‘์šฉ ์ฒ ๊ทผ์€ 2001๋…„ KS D 3504(KSA 2001)์— ์‹ ์„ค๋˜์—ˆ๊ธฐ ๋•Œ๋ฌธ์—, ์ฆ์ถ• ๋˜๋Š” ๋ณด๊ฐ•์ด ํ•„์š”ํ•œ ๊ธฐ์กด ๊ตฌ์กฐ๋ฌผ์— ์‚ฌ์šฉ๋œ ์ฒ ๊ทผ์€ ๋Œ€๋ถ€๋ถ„ ์ผ๋ฐ˜ ์ฒ ๊ทผ์ด๋‹ค.

์ด ์—ฐ๊ตฌ์—์„œ๋Š” D19, D29 ์ผ๋ฐ˜ ์ฒ ๊ทผ์— ๋Œ€ํ•˜์—ฌ KS B ISO 17660-1(KSA 2007)์— ๊ทœ์ •๋œ ์šฉ์ ‘์ด์Œ๊ธธ์ด /Resources/kci/JKCI.2017.29.5.505/images/PIC1FEC.gif ๋ฐ ์ด๋ณด๋‹ค ์งง์€ ์ด์Œ๊ธธ์ด๋ฅผ ๊ฐ–๋Š” ์šฉ์ ‘ ๊ฒน์นจ์ด์Œ์˜ ๊ฐ•๋„๋ฅผ ์‹คํ—˜์ ์œผ๋กœ ํ‰๊ฐ€ํ•˜์˜€๋‹ค.

2. ์šฉ์ ‘ ๊ฒน์นจ์ด์Œ์— ๋Œ€ํ•œ ๋ฌธํ—Œ์—ฐ๊ตฌ

์šฐ๋ฆฌ๋‚˜๋ผ์™€ ๋ฏธ๊ตญ์˜ ์„ค๊ณ„๊ธฐ์ค€๊ณผ ์‚ฐ์—…ํ‘œ์ค€์—์„œ ๊ทœ์ •ํ•œ ์šฉ์ ‘ ๊ฒน์นจ์ด์Œ์— ๋Œ€ํ•œ ํ—ˆ์šฉ ์—ฌ๋ถ€์™€ ์ œํ•œ์กฐ๊ฑด์„ ์ •๋ฆฌํ•˜์˜€์œผ๋ฉฐ, ์ฒ ๊ทผ ์šฉ์ ‘ ๊ฒน์นจ์ด์Œ์— ๋Œ€ํ•œ ์„ ํ–‰ ์—ฐ๊ตฌ๋ฅผ ์กฐ์‚ฌํ•˜์˜€๋‹ค.

2.1 ์ฝ˜ํฌ๋ฆฌํŠธ๊ตฌ์กฐ๊ธฐ์ค€(KCI 2012)

์šฉ์ ‘์ด์Œ์˜ ๊ฐ•๋„๋Š” ์ฒ ๊ทผ ์„ค๊ณ„๊ธฐ์ค€ํ•ญ๋ณต๊ฐ•๋„์˜ 125 % ์ด์ƒ ๋ฐœํœ˜๋˜์–ด์•ผํ•œ๋‹ค. ๊ทธ๋Ÿฌ๋‚˜ KS D3504(KSA 2016)์—์„œ๋Š” ์ธ์žฅ๊ฐ•๋„/ํ•ญ๋ณต๊ฐ•๋„์˜ ๋น„์œจ์„ SD300, SD400, SD400W์™€ SD500W์— ๋Œ€ํ•ด์„œ๋Š” 1.15๋ฐฐ ์ด์ƒ, SD500๊ณผ SD600์— ๋Œ€ํ•ด์„œ๋Š” 1.08๋ฐฐ ์ด์ƒ์œผ๋กœ ๊ทœ์ •ํ•˜๊ณ  ์žˆ๋‹ค. ๋”ฐ๋ผ์„œ ์„ค๊ณ„๊ธฐ์ค€ํ•ญ๋ณต๊ฐ•๋„์˜ 125 %์— ๋„๋‹ฌํ•˜๊ธฐ ์ „์— ์ฒ ๊ทผ ๋ชจ์žฌ๊ฐ€ ํŒŒ๋‹จ๋  ์ˆ˜ ์žˆ๋‹ค. ์ด๋Ÿฐ ๊ฒฝ์šฐ๋„ ์šฉ์ ‘์ด์Œ ์„ฑ๋Šฅ์„ ๋งŒ์กฑํ•œ ๊ฒƒ์œผ๋กœ ๋ณธ๋‹ค.

2.2 KS B ISO 17660-1(KSA 2007)

์ฒ ๊ทผ์„ Fig. 1๊ณผ ๊ฐ™์ด ํ”Œ๋ ˆ์–ดV๊ธ€๋ฃจ๋ธŒ(flare-V-groove) ์šฉ์ ‘์ด์Œํ•˜๋„๋ก ๊ทœ์ •ํ•˜๊ณ  ์žˆ๋‹ค. ์ „์ฒด ์šฉ์ ‘๊ธธ์ด๋Š” ์ฒ ๊ทผ์ง€๋ฆ„(/Resources/kci/JKCI.2017.29.5.505/images/PIC201B.gif)์˜ 8๋ฐฐ ์ด์ƒ์ด๋ฉฐ, ์šฉ์ ‘ ๋ชฉ๋‘๊ป˜(s)๋Š” ์ฒ ๊ทผ์ง€๋ฆ„์˜ 0.3๋ฐฐ ์ด์ƒ์œผ๋กœ ๊ทœ์ •ํ•˜๊ณ  ์žˆ๋‹ค. ๋‹จ์† ์šฉ์ ‘์ด ์—ฐ์† ์šฉ์ ‘์— ๋น„ํ•ด ๋ถˆ๋ฆฌํ•˜๊ธฐ ๋•Œ๋ฌธ์— /Resources/kci/JKCI.2017.29.5.505/images/PIC202C.gif์”ฉ 2๊ณณ์— ๋‹จ์† ์šฉ์ ‘๋œ ์ƒ์„ธ๋ฅผ ์ฑ„ํƒํ•˜๊ณ  ์žˆ๋‹ค. 1๋ฉด ์šฉ์ ‘๋Œ€์‹  /Resources/kci/JKCI.2017.29.5.505/images/PIC204C.gif์”ฉ 2๊ณณ ์–‘๋ฉด์šฉ์ ‘๋„ ํ—ˆ์šฉํ•˜๊ณ  ์žˆ์œผ๋‚˜, ์‹ค์ œ ๊ฑด์„ค ํ˜„์žฅ์—์„œ๋Š” ์ƒํ–ฅ ์šฉ์ ‘์ด ๋ถˆ๊ฐ€๋Šฅํ•˜๊ธฐ ๋•Œ๋ฌธ์— 1๋ฉด ์šฉ์ ‘์ด ์ ํ•ฉํ•˜๋‹ค.

Fig. 1

Details of welded lap splice of KS B ISO 17660-1 (KSA 2007)

/Resources/kci/JKCI.2017.29.5.505/images/Figure_CONCRETE_29_05_09_F1.jpg

Fig. 1 ํ˜•ํƒœ์˜ ์‹œํ—˜์ฒด๋ฅผ ๋งŒ๋Šฅ์‹œํ—˜๊ธฐ(UTM)๋กœ ์ธ์žฅ์‹œํ—˜ํ•˜๊ธฐ ์œ„ํ•ด์„œ๋Š” ์ด์Œ๋œ 2๊ฐ€๋‹ฅ ์ฒ ๊ทผ์˜ ์ค‘์‹ฌ์„ ์„ ์ผ์น˜์‹œํ‚ค๊ธฐ ์œ„ํ•ด ์ฒ ๊ทผ์„ ํœ˜์–ด์•ผํ•œ๋‹ค.

2.3 KS D 3504(KSA 2016)

KS D 3504 (KSA 2016)์—์„œ๋Š” ์ฒ ๊ทผ ์šฉ์ ‘์— ๋Œ€ํ•œ ๊ทœ์ •์€ ์—†์œผ๋ฉฐ, ์ฒ ๊ทผ ๊ฐ•์ข…๋ณ„ ํ™”ํ•™์„ฑ๋ถ„๊ณผ ํƒ„์†Œ๋‹น๋Ÿ‰์„ ๊ฐ๊ฐ Table 1 ๋ฐ ์‹ (1)๊ณผ ๊ฐ™์ด ๊ทœ์ •ํ•˜๊ณ  ์žˆ๋‹ค.

/Resources/kci/JKCI.2017.29.5.505/images/PIC205D.gif (1)

Table 1 Upper limitations of chemical composition of KS D3504 (KSA 2016) (Unit: %)

/Resources/kci/JKCI.2017.29.5.505/images/Table_CONCRETE_29_05_09_T1.jpg

* For bars larger than 32 mm of SD400W and SD500W, the carbon (C) and carbon equivalent (Ceq) shall not exceed 0.25 % and 0.55 % respectively.

2.4 KEPIC SNC ์ฒ ๊ทผ์ฝ˜ํฌ๋ฆฌํŠธ ๊ตฌ์กฐ(KEPIC 2015)

์›์ž๋ ฅ ๋ฐœ์ „์†Œ ๊ตฌ์กฐ๋ฌผ ๊ฑด์„ค์— ์‚ฌ์šฉ๋˜๋Š” KEPIC SNC(KEPIC 2015)๋Š” ACI 349(ACI Committee 349 2013)๋ฅผ ์ฐธ๊ณ ํ•˜์—ฌ ์ž‘์„ฑ๋˜์—ˆ๋‹ค. ์ฒ ๊ทผ ์šฉ์ ‘์€ ACI 318(ACI Committee 318 2014)๊ณผ ๋™์ผํ•˜๊ฒŒ AWS D1.4(AWS 2011)์„ ๋”ฐ๋ผ ํƒ„์†Œ๋‹น๋Ÿ‰๊ณผ ์ฒ ๊ทผ์ง€๋ฆ„์— ๋”ฐ๋ฅธ ์˜ˆ์—ด์„ ์š”๊ตฌํ•˜๊ณ  ์žˆ๋‹ค. ๋งŒ์ผ ์ฒ ๊ทผ์˜ ํƒ„์†Œ๋‹น๋Ÿ‰์„ ํ™•์ธํ•  ์ˆ˜ ์—†๋Š” ๊ฒฝ์šฐ์—๋Š” 19 mm ์ดํ•˜์ฒ ๊ทผ์—๋Š” 150 ยฐC๋กœ, 22 mm ์ด์ƒ ์ฒ ๊ทผ์—์„œ๋Š” 200 ยฐC๋กœ ์˜ˆ์—ดํ•œ ํ›„ ์šฉ์ ‘์ด์Œํ•  ์ˆ˜ ์žˆ๋‹ค. ์›์ž๋ ฅ ๊ตฌ์กฐ๋ฌผ์— ์‚ฌ์šฉ๋˜๋Š” ASTM A706(ASTM 2016)์ฒ ๊ทผ์€ ์ผ๋ฐ˜ ์ฒ ๊ทผ(ASTM A615(ASTM 2016))๋ณด๋‹ค ํƒ„์†Œ๋‹น๋Ÿ‰์ด ๋‚ฎ๊ธฐ ๋•Œ๋ฌธ์— ๋‚ฎ์€ ์˜ˆ์—ด์˜จ๋„๊ฐ€ ๊ทœ์ •๋˜์–ด ์žˆ๋‹ค.

2.5 ACI 318-14(ACI Committee 318 2014)

ACI 318(ACI Committee 318 2014)์—์„œ๋Š” ์ผ๋ฐ˜ ์ฒ ๊ทผ์˜ ์šฉ์ ‘์ด์Œ์„ ํ—ˆ์šฉํ•˜๊ณ  ์žˆ์œผ๋‚˜, AWS D1.4(AWS 2011)์™€ ๋™์ผํ•˜๊ฒŒ ํƒ„์†Œ๋‹น๋Ÿ‰๊ณผ ์ฒ ๊ทผ์ง€๋ฆ„์— ๋”ฐ๋ฅธ ์˜ˆ์—ด์˜จ๋„๋ฅผ ๊ทœ์ •ํ•˜๊ณ  ์žˆ๋‹ค. ๋งŒ์ผ ๊ธฐ์กด ๊ตฌ์กฐ๋ฌผ์˜ ์ฆ์ถ• ๋˜๋Š” ๋ณด๊ฐ•์—์„œ ๊ธฐ์กด ๊ตฌ์กฐ๋ฌผ์— ์‚ฌ์šฉ๋œ ์ฒ ๊ทผ์˜ ํƒ„์†Œ๋‹น๋Ÿ‰์„ ํ™•์ธํ•  ์ˆ˜ ์—†๋Š” ๊ฒฝ์šฐ์—๋Š” 19 mm ์ดํ•˜ ์ฒ ๊ทผ์—๋Š” 150 ยฐC๋กœ, 22 mm ์ด์ƒ ์ฒ ๊ทผ์—์„œ๋Š” 260 ยฐC๋กœ ์˜ˆ์—ดํ•œ ํ›„ ์šฉ์ ‘์ด์Œ ํ•  ์ˆ˜ ์žˆ๋‹ค.

2.6 AWS D1.4(AWS 2011)

๋ฏธ๊ตญ ์šฉ์ ‘ ํ˜‘ํšŒ(American Welding Society, AWS)์—์„œ๋Š” ์ฒ ๊ทผ ์šฉ์ ‘์„ ํ—ˆ์šฉํ•˜๊ณ  ์žˆ์œผ๋ฉฐ, ํƒ„์†Œ๋‹น๋Ÿ‰๊ณผ ์ฒ ๊ทผ ์ง€๋ฆ„์— ๋”ฐ๋ผ ์˜ˆ์—ด์˜จ๋„๋ฅผ ๊ทœ์ •ํ•˜๊ณ  ์žˆ๋‹ค. ์ฒ ๊ทผ์˜ ํƒ„์†Œ๋‹น๋Ÿ‰์ด ํ™•์ธ๊ฐ€๋Šฅํ•œ ๊ฒฝ์šฐ์—๋Š” Table 2์— ๋”ฐ๋ผ ์˜ˆ์—ดํ•œ ํ›„ ์šฉ์ ‘ํ•ด์•ผ ํ•œ๋‹ค. ๋งŒ์ผ ๊ธฐ์กด ๊ตฌ์กฐ๋ฌผ์˜ ์ฆ์ถ• ๋˜๋Š” ๋ณด๊ฐ•์—์„œ ๊ธฐ์กด ๊ตฌ์กฐ๋ฌผ์— ์‚ฌ์šฉ๋œ ์ฒ ๊ทผ์˜ ํƒ„์†Œ๋‹น๋Ÿ‰์„ ํ™•์ธํ•  ์ˆ˜ ์—†๋Š” ๊ฒฝ์šฐ์—๋Š” 19 mm ์ดํ•˜์ฒ ๊ทผ์—๋Š” 150 ยฐC๋กœ 22 mm ์ด์ƒ ์ฒ ๊ทผ์—์„œ๋Š” 260 ยฐC๋กœ ์˜ˆ์—ดํ•œ ํ›„ ์šฉ์ ‘์ด์Œํ•  ์ˆ˜ ์žˆ๋‹ค. ASTM A615(ASTM 2016)์™€ A706(ASTM 2016)์—์„œ๋Š” ์ฒ ๊ทผ์˜ ํƒ„์†Œ๋‹น๋Ÿ‰์„ ๊ฐ๊ฐ ์‹ (2), (3)๊ณผ ๊ฐ™์ด ์‚ฐ์ •ํ•œ๋‹ค. ๋‹จ A706(ASTM 2016)์—์„œ ์ฒ ๊ทผ์˜ ํƒ„์†Œ๋‹น๋Ÿ‰์€ 0.55 %๋ฅผ ๋„˜์„ ์ˆ˜ ์—†๋‹ค.

Table 2 Minimum preheat temperatures of AWS D1.4 (AWS 2011)

/Resources/kci/JKCI.2017.29.5.505/images/Table_CONCRETE_29_05_09_T2.jpg

/Resources/kci/JKCI.2017.29.5.505/images/PIC205E.gif (2)

/Resources/kci/JKCI.2017.29.5.505/images/PIC206F.gif (3)

2.7 Kim et al.(2011)

๊ฐ•ํŒ๊ณผ ์ฃผ์ฒ ๊ทผ์˜ ์šฉ์ ‘, ์ฃผ์ฒ ๊ทผ๊ณผ ๋ ์ฒ ๊ทผ์˜ ์šฉ์ ‘, ๊ฐ€์šฉ์ ‘ ๋“ฑ ์ฒ ๊ทผ์„ ์กฐ๋ฆฝ ๊ณผ์ •์—์„œ ๋ฐœ์ƒํ•  ์ˆ˜ ์žˆ๋Š” ์šฉ์ ‘๋ถ€์— ๋Œ€ํ•œ ์ธ์žฅ์‹œํ—˜์„ ์‹ค์‹œํ•˜์˜€๋‹ค. ์‹œํ—˜๊ฒฐ๊ณผ, SD500 ์šฉ์ ‘์šฉ ์ฒ ๊ทผ๊ณผ ์ผ๋ฐ˜ ์ฒ ๊ทผ์„ ์šฉ์ ‘ํ•˜๋Š” ๊ฒฝ์šฐ, ์šฉ์ ‘๋Ÿ‰์— ๊ด€๊ณ„์—†์ด ํ•ญ๋ณต๊ฐ•๋„ ๋ฐ ์ธ์žฅ๊ฐ•๋„๋Š” KS D3504์˜ ๊ธฐ์ค€์„ ๋งŒ์กฑํ•˜์˜€๋‹ค.

2.8 Nikolaou and Papadimitriou(2004)

RB400, RB500W ์ฒ ๊ทผ์„ ์ด์šฉํ•˜์—ฌ ์˜ˆ์—ด ์˜จ๋„์— ๋”ฐ๋ฅธ ์šฉ์ ‘์˜ ์œ ํšจ์„ฑ์„ ํ‰๊ฐ€ํ•˜์˜€๋‹ค. ์‹คํ—˜๊ฒฐ๊ณผ, ์˜ˆ์—ด ์˜จ๋„๋Š” ์ตœ๋Œ€ ๊ฐ•๋„์— ํฐ ์˜ํ–ฅ์„ ๋ฏธ์น˜์ง€ ์•Š์•˜๋‹ค.

3. ์‹œํ—˜๊ณ„ํš

3.1 ์‹œํ—˜ ๋ณ€์ˆ˜

์ฒ ๊ทผ ์ง€๋ฆ„์— ๋”ฐ๋ฅธ ์ด์Œ ์„ฑ๋Šฅ์„ ํ‰๊ฐ€ํ•˜๊ธฐ ์œ„ํ•˜์—ฌ, D19, D29์˜ 2์ข…๋ฅ˜๋ฅผ ์„ ์ •ํ•˜์˜€๋‹ค.

ํ˜„์žฅ์—์„œ ๊ธฐ์‹œ๊ณต๋œ ์ฒ ๊ทผ์˜ ํ™”ํ•™์„ฑ๋ถ„๊ณผ ๊ฐ•์ข…์„ ๊ตฌ๋ถ„ํ•˜๊ธฐ ์–ด๋ ต๊ธฐ ๋•Œ๋ฌธ์—, AWS D1.4(AWS 2011)์˜ ์˜ˆ์—ด์กฐ๊ฑด ์ค‘ ๊ฐ€์žฅ ๋ถˆ๋ฆฌํ•œ ์กฐ๊ฑด์ธ D19, D29 ์ฒ ๊ทผ์— ๊ฐ๊ฐ 150 ยฐC์™€ 260 ยฐC๋กœ ์˜ˆ์—ดํ•˜์˜€๋‹ค. ์˜ˆ์—ด ์œ ๋ฌด์— ๋”ฐ๋ฅธ ์ด์Œ ์„ฑ๋Šฅ์„ ํ‰๊ฐ€ํ•˜๊ธฐ ์œ„ํ•˜์—ฌ ๋น„์˜ˆ์—ด ์‹œํ—˜๋„ ์‹ค์‹œํ•˜์˜€๋‹ค.

์ฒ ๊ทผ ์ข…๋ฅ˜๋Š” ๊ธฐ์กด ๊ตฌ์กฐ๋ฌผ์— ๋งŽ์ด ์‚ฌ์šฉ๋œ SD400์„ ๊ธฐ๋ณธ์œผ๋กœ ํ•˜์—ฌ, ์ตœ๊ทผ ์‚ฌ์šฉ์ด ์ฆ๊ฐ€ํ•˜๊ณ  ์žˆ๋Š” SD500๊ณผ SD600์„ ์ถ”๊ฐ€ํ•˜์˜€๋‹ค.

์šฉ์ ‘๊ธธ์ด์— ๋”ฐ๋ฅธ ์šฉ์ ‘๊ฐ•๋„๋ฅผ ์•Œ์•„๋ณด๊ธฐ ์œ„ํ•˜์—ฌ, ์šฉ์ ‘ ๊ธธ์ด๋ฅผ ๋ณ€์ˆ˜๋กœ ์„ค์ •ํ•˜์˜€๋‹ค. ์šฉ์ ‘๊ธธ์ด(/Resources/kci/JKCI.2017.29.5.505/images/PIC207F.gif) ๋ณ€์ˆ˜๋Š” /Resources/kci/JKCI.2017.29.5.505/images/PIC2080.gif, /Resources/kci/JKCI.2017.29.5.505/images/PIC2081.gif, /Resources/kci/JKCI.2017.29.5.505/images/PIC2092.gif, /Resources/kci/JKCI.2017.29.5.505/images/PIC2093.gif๋ฅผ ์„ ์ •ํ•˜์˜€๋‹ค. ๊ฐ ์‹œํ—˜๋ณ€์ˆ˜๋ณ„๋กœ ๋™์ผ ์‹œํ—˜์ฒด๋ฅผ 3๊ฐœ์”ฉ ์ œ์ž‘ํ•˜์—ฌ ์ด 132๊ฐœ ์‹œํ—˜์„ ์‹ค์‹œํ•˜์˜€๋‹ค.

3.2 ์‹œํ—˜์ฒด ์„ค๊ณ„

์ธ์žฅ์‹œํ—˜์„ ์œ„ํ•ด์„œ๋Š” ์‹œํ—˜์ฒด์˜ ์ค‘์‹ฌ์ถ•์ด ์ผ์ง์„ ์ƒ์— ์žˆ์–ด์•ผ ํ•˜๋ฏ€๋กœ, Fig. 2์™€ ๊ฐ™์ด ์ฒ ๊ทผ 3๊ฐœ๋ฅผ ์ด์šฉํ•˜์—ฌ ์‹œํ—˜์ฒด๋ฅผ ์ œ์ž‘ํ•˜์˜€๋‹ค. Table 3์— ์‹œํ—˜์ฒด๋ณ„ ์ƒ์„ธ๋ฅผ ๋‚˜ํƒ€๋‚ด์—ˆ๋‹ค. ์ด๋Ÿฌํ•œ ์‹œํ—˜์ฒด ํ˜•์ƒ์œผ๋กœ ์ธํ•ด, ํ•˜์ค‘๊ฐ€๋ ฅ ์‹œ ํŽธ์‹ฌ์ด ๋ฐœ์ƒ๋˜์–ด ์šฉ์ ‘๋ฉด์— ์ „๋‹จ๋ ฅ๊ณผ ํ•จ๊ป˜ ์ธ์žฅ๋ ฅ๋„ ์ž‘์šฉํ•˜๊ฒŒ ๋œ๋‹ค. ์ด ์‘๋ ฅ์ƒํƒœ๋Š” ์‹ค์ œ ์ƒํ™ฉ๋ณด๋‹ค ๋ถˆ๋ฆฌํ•˜๊ธฐ ๋•Œ๋ฌธ์—, ์ด ์‹œํ—˜ ํ•˜์ค‘์€ ๋ณด์ˆ˜์ ์ธ ๊ฒฐ๊ณผ๋ฅผ ์ œ์‹œํ•œ๋‹ค.

Fig. 2

Details of specimens

/Resources/kci/JKCI.2017.29.5.505/images/Figure_CONCRETE_29_05_09_F2.jpg

Table 3 Test matrix

/Resources/kci/JKCI.2017.29.5.505/images/Table_CONCRETE_29_05_09_T3.jpg

3.3 ์‹œํ—˜์ฒด ์ œ์ž‘

์‹œํ—˜์ฒด ์ œ์ž‘์— ์‚ฌ์šฉ๋œ ์ฒ ๊ทผ์€ ์ธ์žฅ๊ฐ•๋„ ์‹œํ—˜์„ ์‹ค์‹œํ•˜์—ฌ ๊ฐ•์ข…์˜ KS D350 4(KSA 2016) ์ ํ•ฉ์„ฑ์„ ๊ฒ€ํ† ํ•˜์˜€๋‹ค. ์šฉ์ ‘ ์ „์— ์‚ฐ์†Œ-์•„์„ธํ‹ธ๋ Œ ํ† ์น˜๋กœ ์ฒ ๊ทผ์„ ๊ฐ€์—ดํ•˜์˜€์œผ๋ฉฐ, ์ ์™ธ์„  ์˜จ๋„๊ณ„๋กœ ์˜ˆ์—ด์˜จ๋„๋ฅผ ํ™•์ธํ•˜์˜€๋‹ค. ๋ชฉํ‘œ ์˜ˆ์—ด์˜จ๋„์—์„œ 10 ยฐC ์ •๋„ ์ƒํšŒํ•˜๋„๋ก ๊ฐ€์—ดํ•œ ํ›„ ๋ชฉํ‘œ ์˜จ๋„์— ๋„๋‹ฌํ•˜๋ฉด FCAW(Flux Cored Arc Welding)์œผ๋กœ ์šฉ์ ‘ํ•˜์˜€๋‹ค. ์šฉ์ ‘์žฌ๋ฃŒ๋Š” KS D7104 (KSA 2012) YFW-C50DR์ด๊ณ , ์—ฐ๊ฐ• ๋ฐ 490 mPa๊ธ‰ ๊ณ ์žฅ๋ ฅ๊ฐ• ์„ ์œผ๋กœ ๋ฃจํ‹ธ(TiO2)์„ ์ฃผ์„ฑ๋ถ„์œผ๋กœ ํ•˜๋Š” ํ”Œ๋Ÿฌ์Šคํƒ€์ž…์ด๋ฉฐ, ์‹ค๋“œ๊ฐ€๋“œ๋Š” CO2์ด๋‹ค. ์ œ์กฐ์‚ฌ์—์„œ ์ œ๊ณตํ•œ ์šฉ์ ‘์žฌ๋ฃŒ ์‚ฌ์–‘์€ ์„ ์ง€๋ฆ„ 1.4 mm, ํ•ญ๋ณต๊ฐ•๋„ 562 mPa, ์ธ์žฅ๊ฐ•๋„ 612 mPa, ์—ฐ์‹ ์œจ 26.8 %, ์ถฉ๊ฒฉ๊ฐ’ 94J์ด๋‹ค. ์šฉ์ ‘ ํ›„ ์ „๋ฌธ๊ธฐ๊ด€์—์„œ ์ž๋ถ„ํƒ์ƒ๋ฒ•(Magnetic Particle Examination)์œผ๋กœ ์šฉ์ ‘๋ถ€ ์ „์ˆ˜ ๊ฒ€์‚ฌ๋ฅผ ์‹ค์‹œํ•˜์˜€์œผ๋ฉฐ, ๋ชจ๋“  ์‹œํ—˜์ฒด๊ฐ€ ํ•ฉ๊ฒฉํ•˜์˜€๋‹ค.

4. ์‹œํ—˜ ๊ฒฐ๊ณผ

4.1 ์žฌ๋ฃŒ์‹œํ—˜ ๊ฒฐ๊ณผ

6๊ฐ€์ง€ ์ฒ ๊ทผ ์ข…๋ฅ˜์— ๋Œ€ํ•ด ๊ฐ๊ฐ 3๊ฐœ์”ฉ ์ธ์žฅ์‹œํ—˜์„ ์‹ค์‹œํ•˜์—ฌ Table 4์— ํ•ญ๋ณต๊ฐ•๋„์™€ ์ธ์žฅ๊ฐ•๋„๋ฅผ ๋‚˜ํƒ€๋‚ด์—ˆ๋‹ค. 2016๋…„ KS D3504(KSA 2016)์˜ ๊ฐœ์ •์œผ๋กœ ๊ฐ•์ข…๋ณ„ ํ•ญ๋ณต๊ฐ•๋„์˜ ์ƒํ•œ๊ฐ’์ด ์‹ ์„ค๋˜์—ˆ์œผ๋ฉฐ, ์ธ์žฅ๊ฐ•๋„๋Š” ์‹ค์ œ ํ•ญ๋ณต๊ฐ•๋„์— ๋Œ€ํ•œ ์ผ์ • ๋น„์œจ ์ด์ƒ์œผ๋กœ ๊ทœ์ • ๋˜์—ˆ๋‹ค. ์‹œํ—˜์— ์‚ฌ์šฉ๋œ 6์ข…๋ฅ˜ ๋ชจ๋‘ ๊ฐœ์ •๋œ KS D3504(KSA 2016)์˜ ๊ฐ•๋„ ์กฐ๊ฑด์„ ๋งŒ์กฑํ•˜์˜€๋‹ค.

์‹œํ—˜์— ์‚ฌ์šฉ๋œ ์ฒ ๊ทผ์˜ ํ™”ํ•™์„ฑ๋ถ„์€ Table 5์™€ ๊ฐ™๋‹ค. KS D3504(KSA 2016)์—์„œ๋Š” ์ผ๋ฐ˜ ์ฒ ๊ทผ์— ๋Œ€ํ•œ ํƒ„์†Œ๋‹น๋Ÿ‰์„ SD600์ฒ ๊ทผ์— ๋Œ€ํ•ด์„œ๋งŒ 0.63 %์ดํ•˜๋กœ ๊ทœ์ •ํ•˜๊ณ  ์žˆ๋Š”๋ฐ, ์‹œํ—˜์— ์‚ฌ์šฉํ•œ SD600์ฒ ๊ทผ์€ ๋ชจ๋‘ ์ด ๊ทœ์ •์„ ๋งŒ์กฑํ•˜๊ณ  ์žˆ๋‹ค. KS D3504(KSA 2016)์— ๋”ฐ๋ฅธ ์ตœ๋Œ€ ํƒ„์†Œ๋‹น๋Ÿ‰์€ SD600 D29์ฒ ๊ทผ์œผ๋กœ 0.570 %์ด๋‹ค. ASTM A706(ASTM 2016)์—์„œ๋Š” 7๊ฐ€์ง€ ์„ฑ๋ถ„์„ ๋ชจ๋‘ ์ด์šฉํ•˜์—ฌ ํƒ„์†Œ๋‹น๋Ÿ‰์„ ์‚ฐ์ •ํ•˜๋ฉฐ ์ตœ๋Œ€ 0.55 % ์ดํ•˜๋กœ ๊ทœ์ •ํ•˜๊ณ  ์žˆ๋‹ค. ์ด ์‹œํ—˜์— ์‚ฌ์šฉํ•œ ์ฒ ๊ทผ์€ ๋ชจ๋‘ ASTM A706(ASTM 2016)๊ทœ์ •์„ ๋งŒ์กฑํ•˜๊ณ  ์žˆ์œผ๋ฉฐ, ASTM A706 (ASTM 2016)์— ๋”ฐ๋ฅธ ์ตœ๋Œ€ ํƒ„์†Œ๋‹น๋Ÿ‰์€ SD600 D29์ฒ ๊ทผ์œผ๋กœ 0.487 %์ด๋‹ค.

์‹œํ—˜์— ์‚ฌ์šฉํ•œ ์ฒ ๊ทผ์€ ์ผ๋ฐ˜ ์ฒ ๊ทผ์ด๋ฏ€๋กœ ์˜ˆ์—ด์˜จ๋„ ์‚ฐ์ •์„ ์œ„ํ•ด์„œ๋Š” AWS D1.4(AWS 2011)์— ๊ทœ์ •๋œ ์ผ๋ฐ˜ ์ฒ ๊ทผ ํƒ„์†Œ๋‹น๋Ÿ‰ ์‚ฐ์ •์‹ ์‹ (2)๋ฅผ ์‚ฌ์šฉํ•˜๋Š” ๊ฒƒ์ด ํƒ€๋‹นํ•˜๋‹ค. ์‹ (2)์— ๋”ฐ๋ฅธ ํƒ„์†Œ๋‹น๋Ÿ‰์€ ์ตœ์†Œ 0.360 %์—์„œ ์ตœ๋Œ€ 0.460 %์ด๋‹ค. AWS D1. 4 (AWS 2011)์— ๋”ฐ๋ฅด๋ฉด, ํƒ„์†Œ๋‹น๋Ÿ‰ 0.45 % ์ดํ•˜์—์„œ๋Š” D36์ฒ ๊ทผ๊นŒ์ง€ ์˜ˆ์—ด์ด ๋ถˆํ•„์š”ํ•˜๋ฉฐ, ์ด๋ฅผ ์ดˆ๊ณผํ•˜๋Š” ์ฒ ๊ทผ๋„ 10 ยฐC๋กœ ๊ทœ์ •ํ•˜๊ณ  ์žˆ๋‹ค. ๋˜ํ•œ ํƒ„์†Œ๋‹น๋Ÿ‰ 0.45 % ์ดˆ๊ณผ 0.55 % ์ดํ•˜์—์„œ๋Š” D19๊นŒ์ง€ ์˜ˆ์—ด์ด ๋ถˆํ•„์š”ํ•˜๋ฉฐ, D22 ์ด์ƒ D35๊นŒ์ง€๋Š” 10 ยฐC์˜ ์˜ˆ์—ด์˜จ๋„๋ฅผ ๊ทœ์ •ํ•˜๊ณ  ์žˆ๋‹ค.

Table 4 Properties of reinforcing bars (Unit: MPa)

/Resources/kci/JKCI.2017.29.5.505/images/Table_CONCRETE_29_05_09_T4.jpg

/Resources/kci/JKCI.2017.29.5.505/images/PICDFAC.gif: yield strength of bar, /Resources/kci/JKCI.2017.29.5.505/images/PICDFAD.gif: tensile strength of bar

Table 5 Chemical composition of reinforcing bar (Unit: %)

/Resources/kci/JKCI.2017.29.5.505/images/Table_CONCRETE_29_05_09_T5.jpg

4.2 ํŒŒ๊ดด์œ ํ˜•๊ณผ ์ตœ๋Œ€๊ฐ•๋„

Fig. 3๊ณผ ๊ฐ™์ด ์šฉ์ ‘์ด์Œ๊ธธ์ด /Resources/kci/JKCI.2017.29.5.505/images/PIC2094.gif, /Resources/kci/JKCI.2017.29.5.505/images/PIC20A4.gif, /Resources/kci/JKCI.2017.29.5.505/images/PIC20A5.gif ์‹œํ—˜์ฒด๋Š” ์ด 108๊ฐœ ์ค‘ 96๊ฐœ์—์„œ ์šฉ์ ‘๋ถ€ํŒŒ๊ดด๊ฐ€ ๋ฐœ์ƒ๋˜์—ˆ์œผ๋ฉฐ, ์šฉ์ ‘์ด์Œ๊ธธ์ด /Resources/kci/JKCI.2017.29.5.505/images/PIC20A6.gif์—์„œ๋Š” ์ด 24๊ฐœ ์ค‘ 22๊ฐœ์—์„œ ์ฒ ๊ทผ ๋ชจ์žฌ๊ฐ€ ํŒŒ๋‹จ๋˜์—ˆ๋‹ค. ์‹œํ—˜์ฒด๋ณ„ ๊ฐ•๋„์™€ ํŒŒ๊ดด์œ ํ˜•์„ Table 6์— ๋‚˜ํƒ€๋‚ด์—ˆ๋‹ค.

Fig. 3

Typical specimen failures

/Resources/kci/JKCI.2017.29.5.505/images/Figure_CONCRETE_29_05_09_F3.jpg

Table 6 Test results

/Resources/kci/JKCI.2017.29.5.505/images/Table_CONCRETE_29_05_09_T6.jpg

Table 6 Test results (Continued)

/Resources/kci/JKCI.2017.29.5.505/images/Table_CONCRETE_29_05_09_T6_1.jpg

1) Measured bar stresses

2) W: Fracture of weld, R: Fracture of reinforcing bar

5. ์ด์Œ๊ฐ•๋„ ํ‰๊ฐ€

์šฉ์ ‘ ๊ฒน์นจ์ด์Œ๋ฐฉ๋ฒ•์œผ๋กœ ์ด์Œ๋œ ์ผ๋ฐ˜ ์ฒ ๊ทผ์˜ ์ด์Œ ์„ฑ๋Šฅ์„ ๊ฐ๊ฐ์˜ ์˜ํ–ฅ์ธ์ž๋ณ„๋กœ ํ‰๊ฐ€ํ•˜์˜€๋‹ค.

5.1 ์šฉ์ ‘๊ธธ์ด ๋ฐ ์˜ˆ์—ด์œ ๋ฌด์˜ ์˜ํ–ฅ

์šฉ์ ‘๊ธธ์ด์— ๋Œ€ํ•œ ์‹œํ—˜๊ฒฐ๊ณผ๋ฅผ Fig. 4์— ๋‚˜ํƒ€๋‚ด์—ˆ๋‹ค. ์šฉ์ ‘๋ถ€ ํŒŒ๊ดด๊ฐ€ ๋ฐœ์ƒ๋œ ๊ฒฝ์šฐ ์šฉ์ ‘๊ธธ์ด์— ๊ฑฐ์˜ ์„ ํ˜•์ ์œผ๋กœ ๋น„๋ก€ํ•˜์—ฌ ์ด์Œ๊ฐ•๋„๊ฐ€ ์ฆ๊ฐ€ํ•˜์˜€๋‹ค. ์ฒ ๊ทผ ๋ชจ์žฌ ๊ฐ•๋„์˜ ๋ณ€ํ™”์™€ ๊ฑฐ์˜ ๋ฌด๊ด€ํ•˜๊ฒŒ ๋™์ผ ์šฉ์ ‘๊ธธ์ด์—์„œ๋Š” ์œ ์‚ฌํ•œ ๊ฐ•๋„๊ฐ€ ๋ฐœํ˜„๋˜์—ˆ๋‹ค. ์šฉ์ ‘๋ถ€ ํŒŒ๊ดด๊ฐ€ ๋ฐœ์ƒ๋œ ๊ฒฝ์šฐ ์ด์Œ๊ฐ•๋„๋Š” ์šฉ์ ‘์žฌ๋ฃŒ(์šฉ์ ‘๋ด‰) ๊ฐ•๋„์— ์ง€๋ฐฐ๋ฅผ ๋ฐ›๊ธฐ ๋•Œ๋ฌธ์— ์ด์Œ๊ฐ•๋„๋Š” ์ฒ ๊ทผ ๊ฐ•์ข…๊ณผ ๋ฌด๊ด€ํ•˜์˜€๋‹ค.

Fig. 4

Splice strengths with varying welded lap length

/Resources/kci/JKCI.2017.29.5.505/images/Figure_CONCRETE_29_05_09_F4.jpg

SD400์ฒ ๊ทผ์€ ์šฉ์ ‘๊ธธ์ด 4/Resources/kci/JKCI.2017.29.5.505/images/PIC20B7.gif์—์„œ ์„ค๊ณ„๊ธฐ์ค€ํ•ญ๋ณต๊ฐ•๋„๊ฐ€ ๋ฐœํ˜„๋˜์—ˆ์œผ๋ฉฐ, ์šฉ์ ‘๊ธธ์ด 6/Resources/kci/JKCI.2017.29.5.505/images/PIC20C8.gif์—์„œ ์„ค๊ณ„๊ธฐ์ค€ํ•ญ๋ณต๊ฐ•๋„์˜ 125 %๊ฐ€ ๋ฐœํ˜„๋˜์–ด ์ฝ˜ํฌ๋ฆฌํŠธ๊ตฌ์กฐ๊ธฐ์ค€(KCI 2012)์˜ ์š”๊ตฌ์„ฑ๋Šฅ์„ ๋งŒ์กฑํ•˜์˜€๋‹ค. ๊ทธ๋Ÿฌ๋‚˜ SD500์œผ๋กœ ์ฒ ๊ทผ๊ฐ•๋„๊ฐ€ ์ฆ๊ฐ€ํ•˜๋ฉด ์šฉ์ ‘๊ธธ์ด 6/Resources/kci/JKCI.2017.29.5.505/images/PIC20C9.gif์—์„œ ์„ค๊ณ„๊ธฐ์ค€ํ•ญ๋ณต๊ฐ•๋„์˜ 125 %๊ฐ€ ๋ฐœํ˜„๋˜์ง€ ์•Š์•˜๋‹ค. SD600 ์ฒ ๊ทผ์—์„œ๋Š” ์šฉ์ ‘๊ธธ์ด 6/Resources/kci/JKCI.2017.29.5.505/images/PIC20CA.gif์—์„œ ์„ค๊ณ„๊ธฐ์ค€ํ•ญ๋ณต๊ฐ•๋„๋ฅผ ๊ฐ„์‹ ํžˆ ์ƒํšŒํ•˜์˜€๋‹ค.

Fig. 4์— ์‹œํ—˜๊ฒฐ๊ณผ ๊ฐ’์„ ์˜ˆ์—ด ์œ ๋ฌด์— ๋”ฐ๋ผ ๊ตฌ๋ถ„ํ•˜์—ฌ ๋‚˜ํƒ€๋‚ด์—ˆ๋‹ค. ์ฒ ๊ทผ ์ง€๋ฆ„๊ณผ ๊ฐ•๋„์— ๊ด€๊ณ„์—†์ด ์˜ˆ์—ด ์œ ๋ฌด์— ๋”ฐ๋ฅธ ์ฐจ์ด๊ฐ€ ๊ฑฐ์˜ ์—†์Œ์„ ์•Œ ์ˆ˜ ์žˆ๋‹ค. ์‹œํ—˜์— ์‚ฌ์šฉ๋œ ์ฒ ๊ทผ์˜ ํƒ„์†Œ๋‹น๋Ÿ‰์„ ASTM A615(ASTM 2016) ๋ฐฉ๋ฒ•์œผ๋กœ ์‚ฐ์ •ํ•˜๋ฉด, ์ตœ์†Œ 0.360 %์—์„œ ์ตœ๋Œ€ 0.460 %์ด๋‹ค. ์ด๋Ÿฌํ•œ ํƒ„์†Œ๋‹น๋Ÿ‰์„ ๊ฐ–๋Š” ์ฒ ๊ทผ์˜ ์šฉ์ ‘์„ ์œ„ํ•ด AWS D1.4(AWS 2011)์—์„œ ์š”๊ตฌ๋˜๋Š” ์˜ˆ์—ด์˜จ๋„๋Š” ์ตœ๊ณ  10 ยฐC์— ๋ถˆ๊ณผํ•˜๋ฏ€๋กœ, ์˜ˆ์—ด ์œ ๋ฌด์— ๋”ฐ๋ฅธ ์‹œํ—˜๊ฒฐ๊ณผ ์ฐจ์ด๊ฐ€ ์—†๋Š” ๊ฒƒ์œผ๋กœ ํŒ๋‹จ๋œ๋‹ค.

5.2 ๊ฐ•์ข…์˜ ์˜ํ–ฅ

๋Œ€๋ถ€๋ถ„์˜ ์‹œํ—˜์ฒด๋“ค์ด ์šฉ์ ‘๋ถ€ ํŒŒ๊ดด๊ฐ€ ๋ฐœ์ƒ๋˜์–ด, ์ด์Œ๊ฐ•๋„๋Š” ์šฉ์ ‘์žฌ๋ฃŒ ๊ฐ•๋„์— ์ง€๋ฐฐ๋˜์—ˆ๋‹ค. ๋”ฐ๋ผ์„œ [์‹œํ—˜๊ฐ•๋„]/[์„ค๊ณ„๊ธฐ์ค€ํ•ญ๋ณต๊ฐ•๋„]์˜ ๋น„์œจ์€ ์ฒ ๊ทผ์˜ ๊ฐ•๋„๊ฐ€ ์ฆ๊ฐ€ํ• ์ˆ˜๋ก ๊ฐ์†Œํ•˜๋Š” ๊ฒฝํ–ฅ์ด ๋‚˜ํƒ€๋‚ฌ๋‹ค. ์šฉ์ ‘ ์ด์Œ ๊ฐ•๋„์— ๋Œ€ํ•œ ๊ฐ•์ข…์˜ ์˜ํ–ฅ์„ ์•Œ์•„๋ณด๊ธฐ ์œ„ํ•ด ๊ฐ•์ข…๋ณ„ ์‹œํ—˜๊ฒฐ๊ณผ์— ๋Œ€ํ•œ T-๊ฒ€์ •์„ ์‹ค์‹œํ•˜์˜€๋‹ค. T-๊ฒ€์ •์˜ ์œ ์˜์ˆ˜์ค€(P-value)์„ 0.05๋กœ ์„ค์ •ํ•˜์˜€์œผ๋ฉฐ, T-๊ฒ€์ • ๊ฒฐ๊ณผ๋ฅผ Table 7์— ๋‚˜ํƒ€๋‚ด์—ˆ๋‹ค. ๊ฐ ๊ฐ•์ข…๋ณ„ P๊ฐ’์ด 0.05 ์ด์ƒ์œผ๋กœ ์ด์Œ๊ฐ•๋„์— ๋Œ€ํ•œ ๊ฐ•์ข…์˜ ์˜ํ–ฅ์ด ์—†๋Š” ๊ฒƒ์œผ๋กœ ๋‚˜ํƒ€๋‚ฌ๋‹ค. ๊ฐ•์ข…์ด ์šฉ์ ‘๋ถ€ ํŒŒ๊ดด๊ฐ€ ๋ฐœ์ƒ๋˜์—ˆ๊ธฐ ๋•Œ๋ฌธ์—, ์ฒ ๊ทผ์˜ ๊ฐ•์ข…์€ ์ด์Œ๊ฐ•๋„์— ๊ฑฐ์˜ ์˜ํ–ฅ์ด ์—†๋Š” ๊ฒƒ์œผ๋กœ ํŒ๋‹จ๋œ๋‹ค.

Table 7 P values of student t-test

/Resources/kci/JKCI.2017.29.5.505/images/Table_CONCRETE_29_05_09_T7.jpg

5.3 ์ฒ ๊ทผ ์ง€๋ฆ„์˜ ์˜ํ–ฅ

์ฒ ๊ทผ ์ง€๋ฆ„์˜ ์˜ํ–ฅ์„ ์•Œ์•„๋ณด๊ธฐ ์œ„ํ•ด D19์™€ D29 ์ฒ ๊ทผ์˜ ์‹œํ—˜๊ฒฐ๊ณผ์— ๋Œ€ํ•œ T-๊ฒ€์ •์„ ์‹ค์‹œํ•˜์˜€๋‹ค. T-๊ฒ€์ • ๊ฒฐ๊ณผ P๊ฐ’์ด 0.23์œผ๋กœ ์šฉ์ ‘ ์ด์Œ ๊ฐ•๋„์— ๋Œ€ํ•œ ์ฒ ๊ทผ ์ง€๋ฆ„์˜ ์˜ํ–ฅ์€ ์—†๋Š” ๊ฒƒ์œผ๋กœ ๋‚˜ํƒ€๋‚ฌ๋‹ค. /Resources/kci/JKCI.2017.29.5.505/images/PIC20FA.gif ๋ฏธ๋งŒ์˜ ์šฉ์ ‘๊ธธ์ด๋ฅผ ๊ฐ€์ง€๊ณ , ์šฉ์ ‘๋ถ€ ํŒŒ๊ดด๊ฐ€ ๋ฐœ์ƒํ•œ 96๊ฐœ์˜ ์‹œํ—˜๊ฒฐ๊ณผ๋ฅผ Fig. 5์— ์ฒ ๊ทผ ์ง€๋ฆ„๋ณ„๋กœ ๋‚˜ํƒ€๋‚ด์—ˆ๋‹ค. D19์ฒ ๊ทผ์˜ ์‹œํ—˜๊ฐ’์ด D29์— ๋น„ํ•ด ์•ฝ๊ฐ„ ๋†’์ง€๋งŒ, T-๊ฒ€์ • ๊ฒฐ๊ณผ ์ฒ ๊ทผ์ง€๋ฆ„์— ํฐ ์ฐจ์ด ์—†์ด ์šฉ์ ‘๊ธธ์ด์— ์„ ํ˜•์ ์œผ๋กœ ๋น„๋ก€ํ•จ์„ ์•Œ ์ˆ˜ ์žˆ๋‹ค.

Fig. 5

Measured strengths with varying welded lap length

/Resources/kci/JKCI.2017.29.5.505/images/Figure_CONCRETE_29_05_09_F5.jpg

5.4 ์„ค๊ณ„๊ธฐ์ค€์— ๋”ฐ๋ฅธ ์šฉ์ ‘๊ฐ•๋„์™€ ๋น„๊ต

KBC 2016(AIK 2016)์— ๋”ฐ๋ฅธ ์šฉ์ ‘๋ถ€ ๊ฐ•๋„๋Š” ์‹ (4)๋กœ ์‚ฐ์ •ํ•  ์ˆ˜ ์žˆ๋‹ค.

/Resources/kci/JKCI.2017.29.5.505/images/PIC211A.gif (4)

์—ฌ๊ธฐ์„œ, /Resources/kci/JKCI.2017.29.5.505/images/PIC211B.gif์€ ์šฉ์ ‘๋ถ€ ๊ฐ•๋„์ด๊ณ  /Resources/kci/JKCI.2017.29.5.505/images/PIC213B.gif๋Š” ์šฉ์ ‘์žฌ์˜ ๊ณต์นญ๊ฐ•๋„์ด๋‹ค.

์‹œํ—˜๊ฐ’๊ณผ ๋น„๊ต๋ฅผ ์œ„ํ•˜์—ฌ ์‹ (4)์—์„œ /Resources/kci/JKCI.2017.29.5.505/images/PIC213C.gif์— ์šฉ์ ‘์žฌ ์ธ์žฅ๊ฐ•๋„๋ฅผ ๋Œ€์ž…ํ•˜๊ณ , /Resources/kci/JKCI.2017.29.5.505/images/PIC214D.gif๋Š” ๋ชฉ๋‘๊ป˜ /Resources/kci/JKCI.2017.29.5.505/images/PIC214E.gif๋ฅผ ์‚ฌ์šฉํ•˜์˜€๋‹ค. ์‹ (4)์— ์˜ํ•œ ๊ณ„์‚ฐ๊ฐ’๊ณผ ์‹œํ—˜๊ฐ’์„ ๋น„๊ตํ•˜์—ฌ Fig. 6์— ๋‚˜ํƒ€๋‚ด์—ˆ๋‹ค. ์šฉ์ ‘๊ธธ์ด /Resources/kci/JKCI.2017.29.5.505/images/PIC215E.gif ์ดํ•˜ ์ค‘ ์šฉ์ ‘๋ถ€ ํŒŒ๊ดด๊ฐ€ ๋ฐœ์ƒํ•œ 96๊ฐœ ์‹œํ—˜์ฒด ๋ชจ๋‘ ์‹ (4)์— ์˜ํ•œ ๊ณ„์‚ฐ๊ฐ’๋ณด๋‹ค ๋†’์€ ๊ฐ•๋„๊ฐ€ ๋ฐœํ˜„๋˜์—ˆ๋‹ค. ์ผ๋ฐ˜ ์ฒ ๊ทผ ์šฉ์ ‘ ๊ฒน์นจ์ด์Œ๋ถ€๋Š” ์„ค๊ณ„๊ธฐ์ค€์— ์˜ํ•œ ๊ณ„์‚ฐ๊ฐ’๋ณด๋‹ค ๋†’์€ ๊ฐ•๋„๋ฅผ ์ง€๋‹ˆ๋Š” ๊ฒƒ์œผ๋กœ ํ‰๊ฐ€๋œ๋‹ค.

Fig. 6

Comparison of measured strengths with calculations by KBC 2016

/Resources/kci/JKCI.2017.29.5.505/images/Figure_CONCRETE_29_05_09_F6.jpg

5.5 ์šฉ์ ‘์ด์Œ์˜ ์•ˆ์ „์œจ ํ‰๊ฐ€

์‹œํ—˜ ๊ฒฐ๊ณผ, ์˜ˆ์—ด๊ณผ ๋น„์˜ˆ์—ด์˜ ์ฐจ์ด๊ฐ€ ์—†์—ˆ๊ณ  ๊ฐ•์ข… ๋ฐ ์ง€๋ฆ„์˜ ์˜ํ–ฅ์ด ์—†๋Š” ๊ฒƒ์œผ๋กœ ๋‚˜ํƒ€๋‚ฌ๋‹ค. ์šฉ์ ‘๋ถ€ ํŒŒ๊ดด๊ฐ€ ๋ฐœ์ƒํ•œ ์‹œํ—˜๊ฒฐ๊ณผ๋ฅผ ์šฉ์ ‘๊ธธ์ด๋ฅผ ๋ณ€์ˆ˜๋กœ ํšŒ๊ท€๋ถ„์„ํ•˜์—ฌ ์šฉ์ ‘ ์ด์Œ๊ฐ•๋„ ์˜ˆ์ธก์‹์„ ์‹ (5)์™€ ๊ฐ™์ด ๋„์ถœํ•˜์˜€๋‹ค.

/Resources/kci/JKCI.2017.29.5.505/images/PIC215F.gif (5)

์—ฌ๊ธฐ์„œ, /Resources/kci/JKCI.2017.29.5.505/images/PIC2180.gif๋Š” ์šฉ์ ‘์ด์Œ ์˜ˆ์ธก๊ฐ•๋„์ด๋‹ค.

์šฉ์ ‘๊ธธ์ด /Resources/kci/JKCI.2017.29.5.505/images/PIC2181.gif๋ฅผ ๊ฐ–๋Š” ์‹œํ—˜์ฒด๋Š” ๋Œ€๋ถ€๋ถ„ ์ฒ ๊ทผ ๋ชจ์žฌ์—์„œ ํŒŒ๋‹จ์ด ๋ฐœ์ƒ๋˜์–ด, ์‹ค์ œ ์ด์Œ๊ฐ•๋„๋ฅผ ์˜ˆ์ธกํ•  ์ˆ˜ ์—†๋‹ค. ์‹ (5)๋ฅผ ์ด์šฉํ•ด ์šฉ์ ‘๊ธธ์ด /Resources/kci/JKCI.2017.29.5.505/images/PIC2182.gif์˜ ์˜ˆ์ƒ๊ฐ•๋„๋ฅผ ํ‰๊ฐ€ํ•จ์œผ๋กœ์จ, ์šฉ์ ‘ ๊ฒน์นจ์ด์Œ์˜ ์ด์Œ๊ฐ•๋„ ์•ˆ์ „์œจ์„ ์‚ฐ์ •ํ•˜์˜€๋‹ค. KS B ISO 17660-1 (KSA 2007)์— ๋”ฐ๋ฅธ /Resources/kci/JKCI.2017.29.5.505/images/PIC2192.gif์˜ ํ‘œ์ค€ ์šฉ์ ‘ ๊ฒน์นจ์ด์Œ์˜ ์ด์Œ๊ฐ•๋„๋ฅผ ์‹ (5)๋ฅผ ํ†ตํ•ด ์˜ˆ์ธกํ•˜๋ฉด 84.1ร—(8)+92.9=765.7 mPa์ด๋‹ค. ์ด ๊ฐ’์œผ๋กœ SD600 ์ฒ ๊ทผ์— ๋Œ€ํ•œ ์•ˆ์ „์œจ์„ ์‚ฐ์ •ํ•˜๋ฉด 765.5/600=1.28์ด๋‹ค.

6. ๊ฒฐ    ๋ก 

์ผ๋ฐ˜ ์ฒ ๊ทผ ์šฉ์ ‘ ๊ฒน์นจ์ด์Œ์— ๋Œ€ํ•œ ์ธ์žฅ์‹œํ—˜ ๊ฒฐ๊ณผ ๋‹ค์Œ์˜ ๊ฒฐ๋ก ์„ ์–ป์—ˆ๋‹ค.

1)KS B ISO 17660-1(KSA 2007)์— ๋”ฐ๋ฅธ ์šฉ์ ‘์ด์Œ์˜ ์ด์Œ๊ฐ•๋„๋Š” ์˜ˆ์—ด ์œ ๋ฌด์— ๋ฌด๊ด€ํ•˜๊ฒŒ ๋ชจ๋‘ ์ฝ˜ํฌ๋ฆฌํŠธ๊ตฌ์กฐ๊ธฐ์ค€์—์„œ ์š”๊ตฌํ•˜๋Š” ์„ค๊ณ„๊ธฐ์ค€ํ•ญ๋ณต๊ฐ•๋„์˜ 125 %๋ฅผ ์ƒํšŒํ•˜์˜€๋‹ค. ์‹œํ—˜์— ์‚ฌ์šฉ๋œ ์ฒ ๊ทผ์˜ ํƒ„์†Œ๋‹น๋Ÿ‰์ด ๋‚ฎ์•˜๊ธฐ ๋•Œ๋ฌธ์— ์˜ˆ์—ด ์œ ๋ฌด๊ฐ€ ์‹œํ—˜๊ฒฐ๊ณผ์— ์˜ํ–ฅ์„ ์ฃผ์ง€ ์•Š์€ ๊ฒƒ์œผ๋กœ ํŒ๋‹จ๋œ๋‹ค.

2)์šฉ์ ‘๊ธธ์ด 2/Resources/kci/JKCI.2017.29.5.505/images/PIC2193.gif, 4/Resources/kci/JKCI.2017.29.5.505/images/PIC2194.gif, 6/Resources/kci/JKCI.2017.29.5.505/images/PIC21A5.gif๋ฅผ ์‹œํ—˜๋ณ€์ˆ˜๋กœ ๊ฐ–๋Š” SD400, SD500, SD600 ๊ฐ•์ข…์˜ D19์™€ D29 ์ด์Œ์€ ๋Œ€๋ถ€๋ถ„(108๊ฐœ ์ค‘ 96๊ฐœ) ์šฉ์ ‘์žฌ์—์„œ ํŒŒ๋‹จ์ด ๋ฐœ์ƒ๋˜์—ˆ๋‹ค. ์šฉ์ ‘๋ถ€ ํŒŒ๊ดด๊ฐ€ ๋ฐœ์ƒ๋œ ๊ฒฝ์šฐ ์ด์Œ๊ฐ•๋„๋Š” ์šฉ์ ‘๊ธธ์ด์— ์„ ํ˜•์ ์œผ๋กœ ๋น„๋ก€ํ•˜์—ฌ ์ฆ๊ฐ€ํ•˜์˜€๋‹ค.

3)์ผ๋ฐ˜ ์ฒ ๊ทผ์„ KS B ISO 17660-1(KSA 2007)์˜ ์šฉ์ ‘์น˜์ˆ˜์™€ AWS D1.4(AWS 2011)์˜ ์˜ˆ์—ด์กฐ๊ฑด์— ์ ํ•ฉํ•˜๊ฒŒ ์šฉ์ ‘์ด์Œํ•˜๋ฉด, ์ฝ˜ํฌ๋ฆฌํŠธ๊ตฌ์กฐ๊ธฐ์ค€์—์„œ ์š”๊ตฌํ•˜๋Š” ์„ค๊ณ„๊ธฐ์ค€ํ•ญ๋ณต๊ฐ•๋„์˜ 125 %๋ฅผ ๋ฐœํ˜„ํ•  ์ˆ˜ ์žˆ๋Š” ๊ฒƒ์œผ๋กœ ํ‰๊ฐ€๋œ๋‹ค.

Acknowledgements

์ด ์—ฐ๊ตฌ๋Š” ใˆœํฌ์Šค์ฝ”๊ฑด์„ค์˜ ์ง€์›์œผ๋กœ ์ˆ˜ํ–‰๋˜์—ˆ์Šต๋‹ˆ๋‹ค. ์—ฐ๊ตฌ์ง€์›์— ๊ฐ์‚ฌ๋“œ๋ฆฝ๋‹ˆ๋‹ค.

References

1 
ACI Committee 318 (2014) Building Code Requirements for Structural Concrete (ACI 318-14) and Commentary. Farming-ton Hills, Mich: ACI. 492.Google Search
2 
ACI Committee 349 (2013) Code requirements for nuclear safety related concrete structures (ACI 349-13). Farmington Hills, Mich: ACI.Google Search
3 
Architectural Institute of Korea (2016) Korean Building Code and Commentary. Seoul: Kimoondang Publishing Company. 842-843. (In Korean)Google Search
4 
ASTM (2016) A706: Standard Specification for Deformed and Plain Low-Alloy Steel Bars for Concrete Reinforcement. US: ASTM. 1-7.Google Search
5 
ASTM. (2016) A615: Standard Specification for Deformed and Plain Carbon-Steel Bars for Concrete Reinforcement. US: ASTM. 1-8.Google Search
6 
AWS. (2011) D1.4: Structural Welding Code-Reinforcing Steel โ€“ Including Metal Inserts and Connections in Reinforced Concrete Construction. US: AWS. 1-72.Google Search
7 
KEPIC. (2015) Nuclear Safety-Related Concrete Structures. Seoul: KEA. 1-19. (In Korean)Google Search
8 
Kim, S. B., Lee, C. N., Yang, J. G., and Kim, S. S. (2011) Study on the Welding Characteristics of High Strength(500MPa) Reinforcing Bar According to Tensile Test. Journal of the Architectural Institute of Korea 27(1), 59-67. (In Korean)Google Search
9 
Korea Concrete Institute (2012) Concrete Design Code and Commentary. Seoul: Kimoondang Publishing Company. 1-599. (In Korean)Google Search
10 
Korea Standard Association (2001) KS D3504; Steel Bars for Concrete Reinforcement. Korea: Korean Agency for Techno-logy and Standards. 1-21. (In Korean)Google Search
11 
Korea Standard Association (2007) KS B ISO 17660-1; Welding-Welding of Reinforcing Steel-Part1:Load-Bearing Welded Joints. Korea: Korean Agency for Technology and Standards. 1-35. (In Korean)Google Search
12 
Korea Standard Association. (2012) KS D7104; Flux Cored Wires for Gas Shielded and Self-Shielded Metal Arc Welding of Mild Steel, High Strength Steel and Low Temperature Service Steel. Korea: Korean Agency for Technology and Standards. 1-10. (In Korean)Google Search
13 
Korea Standard Association. (2016) KS D3504; Steel Bars for Concrete Reinforcement. Korea: Korean Agency for Techno-logy and Standards. 1-31. (In Korean)Google Search
14 
Nikolaou, J. and Papadimitriou, G. D. (2004) Mechanical Properties of Lap-Welded Reinforcing Steel Bars Used for Repairing Damaged Reinforced Concrete Structures. Materials and structures 37(10), 698-706.DOI