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CFP๋ง๋š, P-M ์ƒ๊ด€๋„, ํœจ ์‹คํ—˜, PHC๋ง๋š
CFP pile, P-M interaction curve, flexural experiment, PHC pile

  • 1. ์„œ ๋ก 

  • 2. ์—ฐ๊ตฌ์˜ ํ•„์š”์„ฑ

  • 3. CFP๋ง๋š์˜ ํœจ๊ฐ•๋„ ์‚ฐ์ถœ

  • 4. ์‹œํ—˜์ฒด ์ œ์ž‘ ๋ฐ ์‹คํ—˜

  •   4.1 ์‹คํ—˜๊ณ„ํš

  •   4.2 ์‹œํ—˜์ฒด ์ œ์ž‘

  •   4.3 ์‹คํ—˜๋ฐฉ๋ฒ•

  • 5. ์‹คํ—˜ ๊ฒฐ๊ณผ ๋ฐ ๋น„๊ต ๋ถ„์„

  •   5.1 ๊ท ์—ด ์–‘์ƒ

  •   5.2 ํ•˜์ค‘-์ฒ˜์ง ๊ด€๊ณ„

  •   5.3 ์„ค๊ณ„์™€ ์‹คํ—˜ ๊ฒฐ๊ณผ ๋น„๊ต

  • 6. ๊ฒฐ ๋ก 

1. ์„œ    ๋ก 

ํšŒ์ „์— ์˜ํ•ด ์ƒ๊ธฐ๋Š” ์›์‹ฌ๋ ฅ์„ ์ด์šฉํ•˜์—ฌ ์ฝ˜ํฌ๋ฆฌํŠธ๋ฅผ ๋‹ค์งํ•˜๋Š” ์›์‹ฌ์„ฑํ˜• ์ฝ˜ํฌ๋ฆฌํŠธ๋Š” 1800๋…„๋Œ€๋ถ€ํ„ฐ ์ „์ฃผ, ๋ง๋š, ๊ด€ ๋“ฑ ์ค‘๊ณต ์›ํ†ตํ˜• ์ œํ’ˆ์— ์ด์šฉ๋˜์–ด์ ธ์™”๋‹ค. 1920๋…„ ํ˜ธ์ฃผ์˜ Hume ํ˜•์ œ๊ฐ€ ์ด๋Ÿฌํ•œ ๊ณต๋ฒ•์„ ๋ง๋š์— ์ ์šฉํ•˜์—ฌ PHC๋ง๋š์„ ๋ฐœ๋ช…ํ–ˆ์œผ๋ฉฐ, 1930๋…„๋Œ€ ๋ฏธ๊ตญ์„ ํ†ตํ•ด ์ผ๋ณธ์— ์†Œ๊ฐœ๋˜์—ˆ๊ณ , ์ดํ›„ ์ผ๋ณธ์„ ๊ฑฐ์ณ ์šฐ๋ฆฌ๋‚˜๋ผ์— ๋„์ž…๋˜์—ˆ๋‹ค.1-4) PHC๋ง๋š์˜ ์ถœํ˜„์€ ๊ธฐ์กด RC ๋ฐ PC ๋ง๋š์œผ๋กœ ๊ทน๋ณตํ•˜๊ธฐ ์–ด๋ ค์› ๋˜ ๊นŠ์€ ์‹ฌ๋„์˜ ๋ง๋š์‹œ๊ณต์œผ๋กœ ์‹œ๊ณต์„ฑ์„ ๊ฐœ์„ ํ•˜๊ณ , ๋ณธ๋‹น ์žฅ๊ธฐํ—ˆ์šฉ์ง€์ง€๋ ฅ ์ฆ๊ฐ€ ๋“ฑ์„ ํ†ตํ•ด ๊ฒฝ์ œ์„ฑ์„ ํ™•๋ณดํ•˜๋ฉฐ ๊ทธ ํ’ˆ์งˆ์˜ ์šฐ์ˆ˜์„ฑ์„ ์ž…์ฆํ•˜๋ฉฐ ๋ฐœ์ „ํ•ด ์™”๋‹ค๊ณ  ๋ณผ ์ˆ˜ ์žˆ๋‹ค.5) ์ตœ๊ทผ๋“ค์–ด ๊ตฌ์กฐ๋ฌผ์˜ ๊ณ ์ธตํ™”, ๋Œ€ํ˜•ํ™”์™€ ์ง€๊ฐ€์ƒ์Šน, ํ™˜๊ฒฝ๋ฌธ์ œ ๋“ฑ์ด ์ฃผ์š” ๊ด€์‹ฌ์‚ฌ๋กœ ๋– ์˜ค๋ฅด๋ฉฐ ์ข…๋ž˜์—๋Š” ๋ณผ ์ˆ˜ ์—†์—ˆ๋˜ ๊ฐ์ข… ํŠน์ˆ˜๊ณต์‚ฌ๊ฐ€ ์ฆ๊ฐ€๋จ์— ๋”ฐ๋ผ ๋ง๋š ๊ธฐ์ดˆ๊ณต๋ฒ•์˜ ๊ฐœ์„  ๋ฐ ์ƒ๋ถ€ ๊ตฌ์กฐ๋ฌผ์˜ ํŠน์ˆ˜ํ™”์— ๋งž์ถ”์–ด ์„ฑ๋Šฅ์ด ํ–ฅ์ƒ๋œ ๋ง๋š์˜ ๊ฐœ๋ฐœ์ด ์š”๊ตฌ๋˜๊ณ  ์žˆ๋‹ค.6)

2. ์—ฐ๊ตฌ์˜ ํ•„์š”์„ฑ

ํ† ๋ชฉ ๋ฐ ๊ฑด์ถ• ๋ถ„์•ผ๋ฅผ ํฌํ•จํ•œ ๊ฑด์„ค์‹œ์žฅ์—์„œ ์ฃผ๋กœ ์‚ฌ์šฉ๋˜๊ณ  ์žˆ๋Š” ๋ง๋š์˜ ํ˜•ํƒœ๋Š” ๊ฐ•๊ด€๋ง๋š๊ณผ PHC๋ง๋š์ด ๋Œ€ํ‘œ์ ์ด๋‚˜ ๊ฐ•๊ด€๋ง๋š์€ ๊ตฌ์กฐ์„ฑ๋Šฅ ๋ฐ ์‹œ๊ณต์„ฑ์ด ์šฐ์ˆ˜ํ•œ ๋ฐ˜๋ฉด ์›์ž์žฌ์ธ ์ฒ ๊ฐ•์žฌ๋ฅผ ์ „๋Ÿ‰ ์ˆ˜์ž…์— ์˜์กดํ•˜๊ณ  ์žˆ์–ด ์ง€์†์ ์ธ ๊ฐ€๊ฒฉ ์ƒ์Šน์ด ์ „์ฒด ๊ณต์‚ฌ๋น„์˜ ์ฆ๊ฐ€๋กœ ์ด์–ด์ง€๋Š” ๋‹จ์ ์„ ๊ฐ–๊ณ  ์žˆ์œผ๋ฉฐ, ๋ฐ˜๋Œ€๋กœ PHC๋ง๋š์€ ๊ฐ•๊ด€๋ง๋š ๋Œ€๋น„ ๊ฒฝ์ œ์„ฑ ๋ฉด์—์„œ ๋›ฐ์–ด๋‚œ ์žฅ์ ์ด ์žˆ์ง€๋งŒ ์ˆ˜ํ‰๋ ฅ์ด ํฌ๊ฒŒ ์ž‘์šฉํ•˜๋Š” ๊ตฌ์กฐ์—์„œ๋Š” ์‚ฌ์šฉ์ด ์ œ์•ฝ๋œ๋‹ค.7) PHC๋ง๋š ์‹œ๊ณต๋ถ€๋ถ„์—์„œ๋Š” ์‹œ๊ณต ์ค‘ ๋ง๋š์˜ ์—ฐ์ง์„ฑ์„ ํ™•๋ณดํ•˜์ง€ ๋ชปํ•  ๊ฒฝ์šฐ ๋ง๋š์— ํœจ๋ชจ๋ฉ˜ํŠธ๊ฐ€ ๋ฐœ์ƒํ•˜๊ณ , ๋ฐœ์ƒ๋œ ํœจ๋ชจ๋ฉ˜ํŠธ๊ฐ€ ํ—ˆ์šฉํŒŒ๊ดดํ•œ๋„๋ฅผ ์ดˆ๊ณผํ•˜๊ฒŒ ๋˜๋ฉด ๋ง๋š์˜ ํŒŒ๊ดด ๋˜๋Š” ํ•˜์ค‘ ์ง€์ง€๋ ฅ ์ €ํ•˜ ๋“ฑ์˜ ๋ฌธ์ œ์ ์ด ๋ฐœ์ƒ๋œ๋‹ค.8)

์ตœ๊ทผ ๋“ค์–ด ์ด๋Ÿฌํ•œ ๋ง๋š์˜ ๋‹จ์ ์„ ๋ณด์™„ํ•˜๊ณ ์ž ๋ง๋š ์„ ๋‹จ๋ถ€๋ฅผ ํ™•์žฅํ•˜์—ฌ ์„ ๋‹จ์ง€์ง€๋ ฅ์„ ์ฆ๋Œ€์‹œํ‚ค๋Š” ์„ ๋‹จํ™•์žฅํ˜• ๋ง๋š๊ณผ ๊ฐ•๊ด€๋ง๋š๊ณผ PHC๋ง๋š์˜ ํŠน์ง•๋“ค์„ ์กฐํ•ฉํ•œ ๋ณตํ•ฉ๋ง๋š ๋“ฑ์˜ ๊ฐœ๋ฐœ ๋ฐ ์ ์šฉ์ด ํ™œ๋ฐœํžˆ ์ด๋ฃจ์–ด์ง€๊ณ  ์žˆ๋‹ค.7) ์„ ๋‹จํ™•์žฅํ˜• ๋ง๋š ๊ตฌ์กฐ๋Š” ์„ ๋‹จ์ง€์ง€๋ ฅ ํ–ฅ์ƒ์„ ํ†ตํ•ด ๋ง๋š์˜ ์‚ฌ์šฉ์„ฑ ์ฆ๋Œ€์— ๋ชฉ์ ์ด ์žˆ์œผ๋ฉฐ, ๋ณตํ•ฉ๋ง๋š์€ ์ฃผ ํ•˜์ค‘์ด ์••์ถ•๋ ฅ์ธ ์ค‘โ€คํ•˜๋ถ€ ๋ง๋š์— PHC๋ง๋š์„ ์‚ฌ์šฉํ•˜๊ณ  ์ „๋‹จ๋ ฅ๊ณผ ํœจ๋ชจ๋ฉ˜ํŠธ๊ฐ€ ํฌ๊ฒŒ ๋ฐœ์ƒํ•˜๋Š” ๋ง๋š ์ƒ๋ถ€์—๋Š” ๊ฐ•๊ด€๋ง๋š์„ ์ ์šฉ์‹œํ‚ค๋Š” ๊ธฐ๋Šฅ์„ฑ ๋ง๋š์˜ ๋Œ€ํ‘œ์ ์ธ ๋ง๋š์ด๋‹ค. ๊ทธ๋Ÿฌ๋‚˜ ๋ณตํ•ฉ๋ง๋š์˜ ๊ฒฝ์šฐ ๊ฐ•๊ด€๋ง๋š ๋Œ€๋น„ ๊ฒฝ์ œ์„ฑ์„ ํ™•๋ณดํ•  ์ˆ˜ ์žˆ์œผ๋‚˜, ๋ง๋š์˜ ๋‘๋ถ€์ •๋ฆฌ ์‹œ ์ปคํŒ…๋˜๋Š” ๋ถ€๋ถ„์ด PHC๋ง๋š๋ณด๋‹ค ์ƒ๋Œ€์ ์œผ๋กœ ๊ณ ๊ฐ€์ธ ๊ฐ•๊ด€๋ง๋š์ด์–ด์„œ ๊ฐ•๊ด€๋ง๋š์˜ ๋ฌธ์ œ์ ์œผ๋กœ ๊ฑฐ๋ก ๋˜๋Š” ๊ฒฝ์ œ์„ฑ์—์„œ ์ž์œ ๋กœ์šธ ์ˆ˜๋Š” ์—†๋‹ค.

๋ณธ ์—ฐ๊ตฌ๋Š” PHC๋ง๋š์— ๋ง๋š ๋ณด๊ฐ•์ฒ ๊ทผ(1st reinforcement)๊ณผ ๋‚ด๋ถ€ ๋ณด๊ฐ•์ฒ ๊ทผ(2nd reinforcement)์„ ๋ฐฐ์น˜ํ•˜์—ฌ ๋ง๋š์˜ ํœจ ๊ฐ•๋„๋ฅผ ์ฆ์ง„์‹œํ‚ค๋Š” ๋งํ˜• ํ•ฉ์„ฑ ์ „๋‹จ์—ฐ๊ฒฐ์žฌ๋ฅผ ์ ์šฉํ•œ ์ฝ˜ํฌ๋ฆฌํŠธ ์ถฉ์ „ PHC๋ง๋š(Concrete Filled Pretensioned Spun High Strength Concrete Pile with Ring type Composite shear connectors, ์ดํ•˜ CFP๋ง๋š)์— ๋Œ€ํ•œ ์ถ•๋ ฅ-ํœจ๋ชจ๋ฉ˜ํŠธ(P-M) ์ƒ๊ด€๊ด€๊ณ„์™€ ํœจ ์„ฑ๋Šฅ ํ‰๊ฐ€ ๊ฒฐ๊ณผ๋ฅผ ๋น„๊ตโ€ค๋ถ„์„ํ•˜์—ฌ ๊ธฐ์กด ๋ง๋š์˜ ๋ฌธ์ œ์ ์„ ํ•ด๊ฒฐํ•˜๊ณ ์ž ํ•œ๋‹ค.

3. CFP๋ง๋š์˜ ํœจ๊ฐ•๋„ ์‚ฐ์ถœ

๋ง๋š ๋ณด๊ฐ•์ฒ ๊ทผ, ๋‚ด๋ถ€ ๋ณด๊ฐ•์ฒ ๊ทผ ๋ฐ ์†์ฑ„์›€ ์ฝ˜ํฌ๋ฆฌํŠธ๋ฅผ ๊ฐ–๋Š” CFP๋ง๋š์˜ P-M ์ƒ๊ด€๊ด€๊ณ„๋ฅผ ์˜ˆ์ธกํ•˜๊ธฐ ์œ„ํ•ด Fig. 1์˜ CFP๋ง๋š ๊ตฌ์„ฑ ์žฌ๋ฃŒ์ธ PHC ๋ง๋š, ์†์ฑ„์›€ ์ฝ˜ํฌ๋ฆฌํŠธ, ์ดํ˜• ๊ฐ•์—ฐ์„ , ๋ง๋š ๋ณด๊ฐ•์ฒ ๊ทผ, ๋‚ด๋ถ€ ๋ณด๊ฐ•์ฒ ๊ทผ์˜ ์žฌ๋ฃŒ์  ํŠน์„ฑ์„ ๋ฐ˜์˜ํ•˜์—ฌ ํœจ๋ชจ๋ฉ˜ํŠธ๋ฅผ ์‚ฐ์ถœํ•˜์˜€๋‹ค.

Fig. 1

CFP pile details

/Resources/kci/JKCI.2017.29.4.353/images/Figure_CONCRETE_29_04_03_F1.jpg

CFP๋ง๋š์€ PHC๋ง๋š์— ํ•ฉ์„ฑ ์ „๋‹จ์—ฐ๊ฒฐ์žฌ, ๋ง๋š ๋ณด๊ฐ•์ฒ ๊ทผ, ๋‚ด๋ถ€ ๋ณด๊ฐ•์ฒ ๊ทผ๊ณผ ์†์ฑ„์›€ ์ฝ˜ํฌ๋ฆฌํŠธ๋ฅผ ๋ณด๊ฐ•ํ•œ ๋ง๋š์œผ๋กœ ๊ธฐ๋ณธ์ ์ธ ์žฌ๋ฃŒ๋Š” PHC๋ง๋š๊ณผ ๋™์ผํ•˜๊ฒŒ ๊ธฐ์„ฑ์žฌ๋ฃŒ๋ฅผ ์‚ฌ์šฉํ•˜์˜€์œผ๋ฉฐ, ํ•ฉ์„ฑ ์ „๋‹จ์—ฐ๊ฒฐ์žฌ๋งŒ ์ฃผ๋ฌผ๋กœ ์ œ์ž‘ํ•˜์˜€๊ณ , ์žฌ๋ฃŒ์˜ ํŠน์„ฑ์€ Tables 1, 2์™€ ๊ฐ™๋‹ค.

PHC๋ง๋š์˜ ํœจ๋ชจ๋ฉ˜ํŠธ๋ฅผ ๊ณ„์‚ฐํ•˜๊ธฐ ์œ„ํ•ด์„œ๋Š” Fig. 2์˜ ์••์ถ•๋ธ”๋กํ˜„์˜ ๊ธฐํ•˜ํ•™์  ํ˜•ํƒœ์—์„œ ์••์ถ•์˜์—ญ์˜ ๋ฉด์ ๊ณผ ๋„์‹ฌ์„ ์‹ (1)โˆผ(5)์™€ ๊ฐ™์ด ๊ณ„์‚ฐํ•œ๋‹ค.

Table 1 Concrete material properties

/Resources/kci/JKCI.2017.29.4.353/images/Table_CONCRETE_29_04_03_T1.jpg

Table 2 Steel reinforcement properties

/Resources/kci/JKCI.2017.29.4.353/images/Table_CONCRETE_29_04_03_T2.jpg
Fig. 2

Effective compression section of the current and new PHC pile

/Resources/kci/JKCI.2017.29.4.353/images/Figure_CONCRETE_29_04_03_F2.jpg

/Resources/kci/JKCI.2017.29.4.353/images/PICE3FF.gif (1)

์—ฌ๊ธฐ์„œ, H๋Š” ์›ํ˜•๋‹จ๋ฉด์˜ ๋†’์ด, /Resources/kci/JKCI.2017.29.4.353/images/PICE410.gif๋Š” ์••์ถ•์—ญ์˜ ๋†’์ด, /Resources/kci/JKCI.2017.29.4.353/images/PICE411.gif๋Š” ์••์ถ•๋ธ”๋ก ํ˜„์œผ๋กœ ๋‘˜๋Ÿฌ์Œ“์ธ ๊ฐ์œผ๋กœ ๋‹จ์œ„๋Š” ๋ผ๋””์•ˆ(/Resources/kci/JKCI.2017.29.4.353/images/PICE412.gif)์ด๊ณ , ๋ผ์ธ๊ฐ /Resources/kci/JKCI.2017.29.4.353/images/PICE423.gif์ธ ์›ํ˜ธ์˜ ์›์˜ ์ค‘์‹ฌ์œผ๋กœ๋ถ€ํ„ฐ ๋„์‹ฌ๊นŒ์ง€ ๊ฑฐ๋ฆฌ๋Š” /Resources/kci/JKCI.2017.29.4.353/images/PICE424.gif์ด๋ฏ€๋กœ, ๋ง๋š ๋ฉด์ ์˜ ๋„์‹ฌ์€ ์‹ (2)์™€ ๊ฐ™๋‹ค.9)

 /Resources/kci/JKCI.2017.29.4.353/images/PICE434.gif/Resources/kci/JKCI.2017.29.4.353/images/PICE435.gif (2)

Table 3 Material factors

/Resources/kci/JKCI.2017.29.4.353/images/Table_CONCRETE_29_04_03_T3.jpg

PHC๋ง๋š์˜ ๋ฉด์ (A)์€ ๋ง๋š ์™ธ๊ฒฝ์— ๋”ฐ๋ฅธ ๋‹จ๋ฉด์ ์—์„œ ์ค‘๊ณต๋‹จ๋ฉด์„ ๋บ€ ์‹ (3)์œผ๋กœ ํ‘œํ˜„๋˜๋ฉฐ, PHC๋ง๋š ์ค‘์‹ฌ์— ๊ด€ํ•œ ์••์ถ•์š”์†Œ์˜ 1์ฐจ ๋ชจ๋ฉ˜ํŠธ(/Resources/kci/JKCI.2017.29.4.353/images/PICE446.gif)๋Š” ์‹ (4)์™€ ๊ฐ™๋‹ค.

/Resources/kci/JKCI.2017.29.4.353/images/PICE447.gif (3)

/Resources/kci/JKCI.2017.29.4.353/images/PICE458.gif (4)

/Resources/kci/JKCI.2017.29.4.353/images/PICE459.gif (5)

์—ฌ๊ธฐ์„œ, /Resources/kci/JKCI.2017.29.4.353/images/PICE45A.gif: ํœจ ๋ถ€์žฌ์˜ ๋‹จ๋ฉด์‘๋ ฅ๋ธ”๋ก ๋“ฑ๊ฐ€์‘๋ ฅ ๊ณ„์ˆ˜/Resources/kci/JKCI.2017.29.4.353/images/PICE46A.gif: ์ฝ˜ํฌ๋ฆฌํŠธ์˜ ์„ค๊ณ„์••์ถ•๊ฐ•๋„

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์—ฌ๊ธฐ์„œ, /Resources/kci/JKCI.2017.29.4.353/images/PICE46C.gif: ํ•œ๊ณ„์ƒํƒœ ์žฌ๋ฃŒ์ €ํ•ญ๊ณ„์ˆ˜/Resources/kci/JKCI.2017.29.4.353/images/PICE47D.gif: ํœจ ์••์ถ• ์œ ํšจ๊ณ„์ˆ˜/Resources/kci/JKCI.2017.29.4.353/images/PICE47E.gif: ์ฝ˜ํฌ๋ฆฌํŠธ ๊ณต์‹œ์ฒด ๊ธฐ์ค€์••์ถ•๊ฐ•๋„

ํ•œ๊ณ„์ƒํƒœ์„ค๊ณ„๋ฒ•์— ๋”ฐ๋ฅธ ์žฌ๋ฃŒ ๊ณ„์ˆ˜๋Š” Table 3๊ณผ ๊ฐ™์œผ๋ฉฐ, CFP ๋ง๋š์˜ ํœจ๋ชจ๋ฉ˜ํŠธ๋Š” PHC๋ง๋š, ์†์ฑ„์›€ ์ฝ˜ํฌ๋ฆฌํŠธ, ์ดํ˜• ๊ฐ•์—ฐ์„ , ๋ง๋š ๋ณด๊ฐ•์ฒ ๊ทผ, ๋‚ด๋ถ€ ๋ณด๊ฐ•์ฒ ๊ทผ์˜ ํ•ฉ์œผ๋กœ ์‹ (7), (8)๊ณผ ๊ฐ™๋‹ค.

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CFP๋ง๋š์˜ P-M ์ƒ๊ด€๊ด€๊ณ„ ๊ณ„์‚ฐ์€ ๊ฐ•์žฌ์™€ ์ฝ˜ํฌ๋ฆฌํŠธ์— ๋ฐœ์ƒํ•˜๋Š” ์žฌ๋ฃŒ์˜ ์‘๋ ฅ-๋ณ€ํ˜•๋ฅ  ๊ณก์„ ์œผ๋กœ๋ถ€ํ„ฐ ๊ตฌํ•  ์ˆ˜ ์žˆ๋‹ค. CFP๋ง๋š์˜ ํŒŒ๊ดด ์‹œ ์‹ค์ œ ๋น„์„ ํ˜• ์••์ถ•์‘๋ ฅ ๋ถ„ํฌ๋Š” ํฌ๊ธฐ๊ฐ€ /Resources/kci/JKCI.2017.29.4.353/images/PICE490.gif์ด๊ณ  ๊ท ๋“ฑํ•˜๊ฒŒ ๋ถ„ํฌํ•˜๋Š” ๋“ฑ๊ฐ€ ์ง์‚ฌ๊ฐํ˜• ์‘๋ ฅ๋ถ„ํฌ๋กœ ๊ฐ€์ •ํ•œ๋‹ค. ์—ฌ๊ธฐ์„œ, /Resources/kci/JKCI.2017.29.4.353/images/PICE4A1.gif๋Š” ๋“ฑ๊ฐ€ ์‘๋ ฅ ๋ธ”๋ก์˜ ์‘๋ ฅ ํฌ๊ธฐ ๊ณ„์ˆ˜์ด๊ณ , /Resources/kci/JKCI.2017.29.4.353/images/PICE4A2.gif๋Š” ์‹ (6)๊ณผ ๊ฐ™์ด ๊ณ„์‚ฐ๋œ๋‹ค. ๊ฐ•์žฌ์™€ ์ฝ˜ํฌ๋ฆฌํŠธ์˜ ๋‚ด์  ์ €ํ•ญ๋ ฅ์ด ๊ณ„์‚ฐ๋˜๋ฉด 2๊ฐœ์˜ ํ‰ํ˜• ๋ฐฉ์ •์‹ /Resources/kci/JKCI.2017.29.4.353/images/PICE4B3.gif/Resources/kci/JKCI.2017.29.4.353/images/PICE4B4.gif์— ์˜ํ•ด ์ถ•๋ ฅ(/Resources/kci/JKCI.2017.29.4.353/images/PICE4B5.gif)๊ณผ ๋ชจ๋ฉ˜ํŠธ(/Resources/kci/JKCI.2017.29.4.353/images/PICE4B6.gif)๋ฅผ ๊ฒฐ์ •ํ•˜๊ณ  ํŽธ์‹ฌ์€ /Resources/kci/JKCI.2017.29.4.353/images/PICE4C6.gif/Resources/kci/JKCI.2017.29.4.353/images/PICE4C7.gif์œผ๋กœ ๊ณ„์‚ฐํ•œ๋‹ค.

CFP๋ง๋š์˜ ๊ธฐ๋ณธ ๋‹จ๋ฉด์€ ๋งํ˜• ํ•ฉ์„ฑ ์ „๋‹จ์—ฐ๊ฒฐ์žฌ์™€ ์†์ฑ„์›€ ์ฝ˜ํฌ๋ฆฌํŠธ๊ฐ€ ๋ฐฐ์น˜๋œ ๋‹จ๋ฉด์œผ๋กœ Fig. 3์€ ์†์ฑ„์›€ ์ฝ˜ํฌ๋ฆฌํŠธ์˜ ์••์ถ•๊ฐ•๋„์— ๋”ฐ๋ฅธ P-M ์ƒ๊ด€๋„๋กœ ์†์ฑ„์›€ ์ฝ˜ํฌ๋ฆฌํŠธ์™€ ํ‘ธํŒ…๊ธฐ์ดˆ์˜ ์ผ๊ด„ํƒ€์„ค์„ ์œ„ํ•ด ๋ณ€์ˆ˜๋ฅผ ์†์ฑ„์›€ ์ฝ˜ํฌ๋ฆฌํŠธ ์••์ถ•๊ฐ•๋„ 24 MPa, 27MPa, 40MPa๋กœ ์ ์šฉํ•˜์˜€๋‹ค. CFP ์ˆœ์ˆ˜ ์••์ถ•๋ ฅ์€ ์†์ฑ„์›€ ์ฝ˜ํฌ๋ฆฌํŠธ์˜ ์••์ถ•๊ฐ•๋„ ๋ณ€ํ™”์— ๋”ฐ๋ผ ์••์ถ•๊ฐ•๋„ 24MPa ๋Œ€๋น„ ๊ฐ๊ฐ 2.7%, 15.63% ํ–ฅ์ƒ๋˜๋Š” ๊ฒƒ์„ ๋ณผ ์ˆ˜ ์žˆ๋‹ค.

Fig. 3

P-M interaction curve according to the filled concrete compression strength

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๋ณด๊ฐ•์ฒ ๊ทผ๊ณผ ์†์ฑ„์›€ ์ฝ˜ํฌ๋ฆฌํŠธ์˜ ๊ฐ•๋„์— ๋”ฐ๋ฅธ P-M ์ƒ๊ด€๊ด€๊ณ„๋ฅผ ์•Œ์•„๋ณด๊ธฐ ์œ„ํ•ด ์†์ฑ„์›€ ์ฝ˜ํฌ๋ฆฌํŠธ์˜ ๊ฐ•๋„์™€ ๋ณด๊ฐ• 1๋‹จ๊ณ„ ๋ง๋š ๋ณด๊ฐ•์ฒ ๊ทผ๋Ÿ‰ ๊ทธ๋ฆฌ๊ณ  ๋ณด๊ฐ• 2๋‹จ๊ณ„ ๋‚ด๋ถ€ ๋ณด๊ฐ•์ฒ ๊ทผ๋Ÿ‰์„ ๋ณ€์ˆ˜๋กœ P-M ์ƒ๊ด€๋„๋ฅผ ์ž‘์„ฑํ•˜์—ฌ Fig. 4(a), (b), (c)์™€ ๊ฐ™์ด ๋‚˜ํƒ€๋ƒˆ์œผ๋ฉฐ, (b), (c)์˜ ๋ณด๊ฐ•์ฒ ๊ทผ ์ˆ˜๋Ÿ‰์€ ํ•˜์ค‘์˜ ๋ฐฉํ–ฅ์„ฑ์„ ๊ณ ๋ คํ•˜์—ฌ 8๊ฐœ๋กœ ๊ณ ์ •ํ•˜๊ณ , ์ฒ ๊ทผ์˜ ์ง๊ฒฝ๋งŒ์„ ๋ณ€์ˆ˜๋กœํ•˜์—ฌ 1, 2์ฐจ ๋ณด๊ฐ• ๋‹จ๊ณ„๋ณ„ P-M ์ƒ๊ด€๋„๋ฅผ ๋‚˜ํƒ€๋‚ด์—ˆ๋‹ค.

Fig. 4

P-M interaction curves

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์›ํ˜•๋‹จ๋ฉด์˜ ๋ณด๊ฐ•๋œ ์ฒ ๊ทผ ๊ฐœ์ˆ˜์™€ ์ค‘๋ฆฝ์ถ• ๋ฐฉํ–ฅ์— ๋Œ€ํ•œ ์œ„์น˜์— ๋”ฐ๋ผ ๋ชจ๋ฉ˜ํŠธ ๊ฐ•๋„๊ฐ€ ์ผ์ •ํ•˜์ง€ ์•Š์œผ๋ฏ€๋กœ ์ƒ๊ด€๋„ ์ž‘์„ฑ ์‹œ ๊ฐ€์žฅ ์ทจ์•ฝํ•œ ์œ„์น˜์— ์ฒ ๊ทผ์„ ๋ฐฐ์น˜ํ•˜์—ฌ ๊ณ„์‚ฐํ•˜์—ฌ์•ผ ํ•˜์ง€๋งŒ, ์ฒ ๊ทผ์˜ ๊ฐœ์ˆ˜๊ฐ€ 8๊ฐœ ์ด์ƒ์ด ๋˜๋ฉด ๋งˆ์น˜ ์—ฐ์†์œผ๋กœ ๋ฐฐ์น˜ํ•˜๋Š” ๊ฒฉ์ด ๋˜์–ด ์ด๋Ÿฐ ๋ฌธ์ œ๊ฐ€ ์—†์–ด์ง€๊ธฐ ๋•Œ๋ฌธ์ด๋‹ค.9) ์ด๋Ÿฌํ•œ ์ด์œ ๋กœ CFP๋ง๋š์˜ 1, 2์ฐจ ๋ณด๊ฐ•์ฒ ๊ทผ์„ 8๊ฐœ๋กœ ํ•˜์—ฌ ์ˆ˜ํ‰ํ•˜์ค‘์— ๋Œ€ํ•œ ๋ฐฉํ–ฅ์„ฑ์„ ๊ณ ๋ คํ•œ ๋ฐฐ์น˜๊ฐ€ ๋˜๋„๋ก ํ•˜์˜€๋‹ค.

Fig. 4(a)์™€ ๊ฐ™์ด ๋ง๋š ๋ณด๊ฐ•์ฒ ๊ทผ์ด(H13-8EA) ๋ฐฐ์น˜๋œ ๋ณด๊ฐ• 1๋‹จ๊ณ„์˜ ์†์ฑ„์›€ ์ฝ˜ํฌ๋ฆฌํŠธ ๊ฐ•๋„ ๋ณ€ํ™”์— ๋”ฐ๋ฅธ P-M ์ƒ๊ด€๋„์—์„œ๋Š” 24MPa๋ฅผ ๊ธฐ์ค€์œผ๋กœ 2.5%, 13.5%์˜ CFP๋ง๋š ์ˆœ์ˆ˜ ์••์ถ•๋ ฅ ์ฆ๊ฐ€๊ฐ€ ๋‚˜ํƒ€๋‚ฌ๊ณ , Fig. 4(b)๋Š” ์ฝ˜ํฌ๋ฆฌํŠธ ๊ฐ•๋„ 24MPa๋กœ ์†์ฑ„์›€๋œ ๋ณด๊ฐ• 1๋‹จ๊ณ„์˜ P-M ์ƒ๊ด€๋„๋กœ ๋ง๋š ๋ณด๊ฐ•์ฒ ๊ทผ H13-8EA๋ฅผ ๊ธฐ์ค€์œผ๋กœ ๋ง๋š ๋ณด๊ฐ•์ฒ ๊ทผ ์ง๊ฒฝ๋ณ€ํ™”์— ๋”ฐ๋ผ 13.0%, 28.8% ์ˆœ์ˆ˜ ํœจ๋ชจ๋ฉ˜ํŠธ๊ฐ€ ์ฆ๊ฐ€ํ•˜์˜€๋‹ค. (c)๋Š” ์†์ฑ„์›€ ์ฝ˜ํฌ๋ฆฌํŠธ(24MPa)์™€ 1์ฐจ๋กœ ๋ณด๊ฐ•๋œ(H13-8ea) CFP๋ง๋š์— ๋‚ด๋ถ€ ๋ณด๊ฐ•์ฒ ๊ทผ์„ ๋ณ€์ˆ˜๋กœ ํ•œ P-M์ƒ๊ด€๋„๋กœ H19-8ea ๋Œ€๋น„ ์ˆœ์ˆ˜ ํœจ๋ชจ๋ฉ˜ํŠธ๊ฐ€ 9.4%, 20.3% ์ฆ๊ฐ€ํ•˜๊ฒŒ ๋‚˜ํƒ€๋‚ฌ๋‹ค.

Fig. 4๋Š” CFP๋ง๋š์ด ๊ฐ–๋Š” ๋ณด๊ฐ• ์žฌ๋ฃŒ๋ฅผ ํ™œ์šฉํ•˜์—ฌ ์™ธ๋ ฅ์— ๋”ฐ๋ฅธ ๋ง๋š๋‚ด๋ ฅ ๋ณด๊ฐ•๋ฐฉ์•ˆ์˜ ๋‹ค์–‘์„ฑ์„ ๋ณด์—ฌ์ฃผ๊ณ  ์žˆ์œผ๋ฉฐ, ์„ค๊ณ„์กฐ๊ฑด ๋ฐ ํ˜„์žฅ์—ฌ๊ฑด์— ๋”ฐ๋ผ ์œ„์˜ ์˜ˆ์‹œ์™€ ๊ฐ™์ด ๋ง๋š ๋ฐ ๋‚ด๋ถ€ ๋ณด๊ฐ•์ฒ ๊ทผ๊ณผ ์†์ฑ„์›€ ์ฝ˜ํฌ๋ฆฌํŠธ์˜ ๊ฐ•๋„๋ฅผ ๋ณ€์ˆ˜๋กœ ํ•˜์—ฌ ์ตœ์  ์„ค๊ณ„๊ฐ€ ๊ฐ€๋Šฅํ•  ๊ฒƒ์œผ๋กœ ์ƒ๊ฐ๋œ๋‹ค.

Table 4, Fig. 5์™€ ๊ฐ™์ด CFP๋ง๋š์˜ ๊ธฐ๋ณธ ๊ตฌ์„ฑ์€ ์†์ฑ„์›€ ์ฝ˜ํฌ๋ฆฌํŠธ(24Mpa), ๋ง๋š ๋ณด๊ฐ•์ฒ ๊ทผ(H13-8ea)๊ณผ ๋‚ด๋ถ€ ๋ณด๊ฐ•์ฒ ๊ทผ(H19-8ea)์œผ๋กœ ๊ตฌ์„ฑ๋˜์–ด์žˆ๋‹ค. ๋ณด๊ฐ• ๋‹จ๊ณ„์— ๋”ฐ๋ผ CFP-N-N ์‹œํ—˜์ฒด๋ฅผ ๊ธฐ์ค€์œผ๋กœ ์ตœ๋Œ€ ๋ชจ๋ฉ˜ํŠธ(Mu,max)๋Š” 5.4โˆผ16.5%, ์ˆœํ›„ ํœจ ๋ชจ๋ฉ˜ํŠธ(Mu,pure)๋Š” 33.8โˆผ99.4%, ์ตœ๋Œ€ ์ถ•๋ ฅ(Pu,max)์€ 4.4โˆผ16.5%์˜ ์ฆ๊ฐ€ํ•˜์˜€๋‹ค.

Table 4 Results of CFP pile P-M interaction analysis

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Fig. 5

CFT pile P-M interaction curves

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Fig. 6(a)โˆผ(c)๋Š” CFP๋ง๋š์˜ ๋ณด๊ฐ• ๋‹จ๊ณ„๋ณ„ ํ•œ๊ณ„์ƒํƒœ์„ค๊ณ„๋ฒ•์— ์˜ํ•œ P-M ์ƒ๊ด€๊ด€๊ณ„๋ฅผ ๋‚˜ํƒ€๋‚ธ ๊ฒƒ์œผ๋กœ, (a)โˆผ(c)์™€ ๊ฐ™์ด ๊ทนํ•œํ•œ๊ณ„์ƒํƒœ, ๊ทน๋‹จ์ƒํ™ฉํ•œ๊ณ„์ƒํƒœ, ์‚ฌ์šฉํ•œ๊ณ„์ƒํƒœ์˜ P-M์ƒ๊ด€๊ด€๊ณ„๊ฐ€ ๋‚˜ํƒ€๋ƒˆ๊ณ , ์ด๋Š” ํ•œ๊ณ„์ƒํƒœ๋ณ„ ์ ์šฉ๋œ ๊ฐ ์žฌ๋ฃŒ์˜ ์žฌ๋ฃŒ์ €ํ•ญ๊ณ„์ˆ˜(/Resources/kci/JKCI.2017.29.4.353/images/PICE4D8.gif), ์ดํ˜• ๊ฐ•์—ฐ์„ ๊ณผ ๋ณด๊ฐ•์ฒ ๊ทผ์˜ ํ•ญ๋ณต๋ณ€ํ˜•๋ฅ (/Resources/kci/JKCI.2017.29.4.353/images/PICE4D9.gif)์— ๋”ฐ๋ผ ๋‹ค๋ฅด๊ฒŒ ๋‚˜ํƒ€๋‚ฌ๋‹ค.

Fig. 6

P-M interaction curves according to various limit states

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๋˜ํ•œ CFP๋ง๋š์€ PHC๋ง๋š์„ ๊ธฐ๋ณธ์œผ๋กœ ํ•˜๊ณ  ์žˆ์œผ๋ฏ€๋กœ PHC๋ง๋š ์„ค๊ณ„์— ์ ์šฉ๋˜๋Š” ํ—ˆ์šฉ์‘๋ ฅ ์ˆ˜์ค€์„ ๊ณ ๋ คํ•œ 4๋ฐฐ์˜ ์•ˆ์ „์œจ์„ ๋„์ž…ํ•˜์—ฌ Fig. 7๊ณผ ๊ฐ™์ด ๊ฐ ์‹คํ—˜์ฒด๋ณ„ P-M์ƒ๊ด€๋„๋ฅผ ๋‚˜ํƒ€๋‚ด์—ˆ๋‹ค.

Fig. 7

P-M interaction curves of safety factor 4

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4. ์‹œํ—˜์ฒด ์ œ์ž‘ ๋ฐ ์‹คํ—˜

4.1 ์‹คํ—˜๊ณ„ํš

CFP๋ง๋š์˜ ์ œ์ž‘์€ PHC๋ง๋š ์ œ์ž‘๊ณต์ • ์ค‘ ํŽธ์„ฑ๋œ ์ฒ ๊ทผ ๋ง์— ํ•ฉ์„ฑ ์ „๋‹จ์—ฐ๊ฒฐ์žฌ์˜ ๋ฐฐ์น˜ํ•˜๊ณ , ํ•ฉ์„ฑ ์ „๋‹จ์—ฐ๊ฒฐ์žฌ ์ฒ ๊ทผ ํ™€์— ๋ง๋š ๋ณด๊ฐ•์ฒ ๊ทผ์„ ์‚ฝ์ž…ํ•œ ํ›„ ์›์‹ฌ์„ฑํ˜•์„ ํ†ตํ•ด ๋ณด๊ฐ• 1๋‹จ๊ณ„ ํ”„๋ฆฌ์บ์ŠคํŠธ ๊ณต์ •์„ ์™„๋ฃŒํ•˜์˜€์œผ๋ฉฐ, 2๋‹จ๊ณ„ ๋ณด๊ฐ• ๊ณต์ •์€ ๋ณด๊ฐ• 1๋‹จ๊ณ„๊ฐ€ ์™„๋ฃŒ๋œ ๋ง๋š์˜ ์ค‘๊ณต ๋‹จ๋ฉด์— Fig. 9์™€ ๊ฐ™์ด ๋‚ด๋ถ€ ๋ณด๊ฐ•์ฒ ๊ทผ์„ ๋ฐฐ์น˜ํ•˜๊ณ  ์ฝ˜ํฌ๋ฆฌํŠธ ์†์ฑ„์›€ํ•˜์—ฌ Fig. 10๊ณผ ๊ฐ™์ด ์‹œํ—˜์ฒด ์ œ์ž‘์„ ์™„๋ฃŒํ•˜์˜€๋‹ค. ์‹œํ—˜์ฒด๋Š” Table 5์™€ ๊ฐ™์ด CFP๋ง๋š์ด ๊ฐ–๋Š” ๊ฐ ๋‹จ๋ฉด๋ณ„ ๊ฐ๊ฐ 2๊ฐœ์˜ ์‹œํ—˜์ฒด๋ฅผ ์ œ์ž‘ํ•˜์—ฌ ์„ฑ๋Šฅํ‰๊ฐ€์‹œํ—˜์„ ์ˆ˜ํ–‰ํ•˜์˜€๋‹ค.

์‹œํ—˜์ฒด๋Š” KS ์ œํ’ˆ์ธ PHC๋ง๋š ร˜500, A type (Table 6)์„ ์‚ฌ์šฉํ•˜์˜€์œผ๋ฉฐ, ์†์ฑ„์›€ ์ฝ˜ํฌ๋ฆฌํŠธ์˜ ๊ธฐ์ค€ ์••์ถ•๊ฐ•๋„๋Š” 24MPa๋ฅผ ์ ์šฉํ•˜์˜€๋‹ค.

Table 5 Consist of specimens

/Resources/kci/JKCI.2017.29.4.353/images/Table_CONCRETE_29_04_03_T5.jpg

Table 6 Properties of PHC pile

/Resources/kci/JKCI.2017.29.4.353/images/Table_CONCRETE_29_04_03_T6.jpg

4.2 ์‹œํ—˜์ฒด ์ œ์ž‘

CFP๋ง๋š์˜ ์ œ์ž‘ ๋ฐ ํ˜„์žฅ์‹œ๊ณต์€ ๊ธฐ์กด PHC๋ง๋š๊ณผ ๊ฐ™์ด 1์ฐจ ํ”„๋ฆฌ์บ์ŠคํŠธ ๋ง๋š ์ œ์ž‘๊ณผ 2์ฐจ ํ˜„์žฅ ์‹œ๊ณต์œผ๋กœ ๋‚˜๋‰œ๋‹ค. ํ”„๋ฆฌ์บ์ŠคํŠธ ๋ง๋š ์ œ์ž‘์—์„œ๋Š” PHC๋ง๋š ์ œ์ž‘๊ณต์ •์— Fig. 8๊ณผ ๊ฐ™์ด (a) ํ•ฉ์„ฑ ์ „๋‹จ์—ฐ๊ฒฐ์žฌ ๋ฐฐ์น˜์™€ (b) ๋ง๋š ๋ณด๊ฐ•์ฒ ๊ทผ ์‚ฝ์ž… ๊ณต์ •์ด ์ถ”๊ฐ€๋œ๋‹ค.

Fig. 8

Precast process of the CFP Pile

/Resources/kci/JKCI.2017.29.4.353/images/Figure_CONCRETE_29_04_03_F8.jpg
Fig. 9

Construction site reinforcing process

/Resources/kci/JKCI.2017.29.4.353/images/Figure_CONCRETE_29_04_03_F9.jpg
Fig. 10

CFP pile specimens

/Resources/kci/JKCI.2017.29.4.353/images/Figure_CONCRETE_29_04_03_F10.jpg

ํ˜„์žฅ์‹œ๊ณต์€ PHC๋ง๋š์˜ ๊ณต์ •๊ณผ ๊ฐ™์ด ๋ง๋š ์ปคํŒ…๊ณผ ๋‚ด๋ถ€ ๋ณด๊ฐ•์ฒ ๊ทผ์˜ ๋ฐฐ์น˜๋กœ ํ˜„์žฅ ์‹œ๊ณต๋ฐฉ๋ฒ•์ด ๋™์ผํ•˜๊ฒŒ ์ด๋ฃจ์–ด์ง„๋‹ค.

4.3 ์‹คํ—˜๋ฐฉ๋ฒ•

CFP๋ง๋š์˜ ํœจ ๊ฐ•๋„ ์‹คํ—˜์€ Fig. 11๊ณผ ๊ฐ™์ด ๋ง๋š ๊ธธ์ด์˜ 3/5์„ ์ง€๊ฐ„์œผ๋กœ ํ•˜์—ฌ ์ง€์ง€ํ•˜๊ณ  ์ง€๊ฐ„์˜ ์ค‘์•™์— ์—ฐ์ง ํ•˜์ค‘ P๋ฅผ ๊ฐ€๋ ฅํ•˜๋Š” ๋ฐฉ๋ฒ•์œผ๋กœ ์‹คํ—˜์„ ์ง„ํ–‰ํ•˜์˜€๋‹ค. ๋ง๋š ์‹œํ—˜๊ธฐ์˜ ์šฉ๋Ÿ‰์€ 1,500kN์ด๊ณ  ํ•˜์ค‘์ œ์–ด๋Š” ๋‹จ์กฐ๊ฐ€๋ ฅ๋ฐฉ์‹์œผ๋กœ ํ•˜์˜€์œผ๋ฉฐ, ์‹œํ—˜์ฒด ๋ณ€์œ„ ์ธก์ •์„ ์œ„ํ•ด ์‹œํ—˜์ฒด ์ค‘์•™๋ถ€์™€ ์–‘ ์ง€์ ๊ณผ ํ•˜์ค‘ ์žฌํ•˜์  1/2์ง€์ ์— ๊ฐ๊ฐ LVDT๋ฅผ ์„ค์น˜ํ•˜์˜€๋‹ค.

Fig. 11

Test specimen setup

/Resources/kci/JKCI.2017.29.4.353/images/Figure_CONCRETE_29_04_03_F11.jpg

PHC๋ง๋š์˜ ์ดˆ๊ธฐ๊ท ์—ด ๋ฐ ํœจ๋ชจ๋ฉ˜ํŠธ ๊ณ„์‚ฐ์‹ (8)์— ์˜ํ•ด CFP๋ง๋š์˜ ์ดˆ๊ธฐ๊ท ์—ด ๋ฐ ํœจ๋ชจ๋ฉ˜ํŠธ๋ฅผ ๊ณ„์‚ฐํ•˜์˜€๋‹ค.10)

/Resources/kci/JKCI.2017.29.4.353/images/PICE4EA.gif (8)

์—ฌ๊ธฐ์„œ, /Resources/kci/JKCI.2017.29.4.353/images/PICE4EB.gif๋Š” KS F 4306์— ๋ช…๊ธฐ๋œ PHC๋ง๋š์˜ ์ค‘๋Ÿ‰์ด๋ฉฐ, /Resources/kci/JKCI.2017.29.4.353/images/PICE4FB.gif๋Š” ์†์ฑ„์›€ ์ฝ˜ํฌ๋ฆฌํŠธ์˜ ์ค‘๋Ÿ‰, L์€ ๋ง๋š ๊ธธ์ด, P๋Š” ์žฌํ•˜ ํ•˜์ค‘์ด๋‹ค.

5. ์‹คํ—˜ ๊ฒฐ๊ณผ ๋ฐ ๋น„๊ต ๋ถ„์„

5.1 ๊ท ์—ด ์–‘์ƒ

Fig. 12(a)โˆผ(f)๋Š” ์‹คํ—˜์—์„œ ๋‚˜ํƒ€๋‚œ ๊ท ์—ด์–‘์ƒ์„ ๋ณด์—ฌ์ฃผ๊ณ  ์žˆ์œผ๋ฉฐ, 3์ข…๋ฅ˜์˜ ์‹œํ—˜์ฒด๋ฅผ ๊ฐ๊ฐ 2๊ฐœ์”ฉ ์‹คํ—˜ํ•œ ๊ฒฐ๊ณผ ๊ฐ™์€ ์‹œํ—˜์ฒด๋Š” ๊ท ์—ด ์–‘์ƒ์ด ์œ ์‚ฌํ•˜๊ฒŒ ๋‚˜ํƒ€๋‚ฌ์œผ๋ฉฐ, ๋ณด๊ฐ• ์ฒ ๊ทผ๋Ÿ‰์ด ๋งŽ์„์ˆ˜๋ก ์ฝ˜ํฌ๋ฆฌํŠธ์˜ ๋ฏธ์„ธ ๊ท ์—ด์ด ๋งŽ์ด ๋ฐœ์ƒํ•˜๊ณ  ๊ท ์—ด๋ฐœ์ƒ ๊ตฌ๊ฐ„ ๋˜ํ•œ ๋„“์–ด์ง€๋Š” ํŒจํ„ด์„ ๋ณด์˜€๋‹ค.

(a)CFP-N-N (1) ์‹œํ—˜์ฒด์˜ ๊ท ์—ด์–‘์ƒ์€ Fig. 12(a)์™€ ๊ฐ™์ด ๊ฒฝ๊ฐ„์ค‘์•™๋ถ€์—์„œ ์ดˆ๊ธฐ ๊ท ์—ด์ด ๊ด€์ฐฐ๋˜์—ˆ๊ณ  ๊ฐ€๋ ฅํ•˜์ค‘์ด ์ฆ๊ฐ€ํ•จ์— ๋”ฐ๋ผ ํœจ ๊ตฌ๊ฐ„์—์„œ ์ถ”๊ฐ€ ๊ท ์—ด์ด ๋ฐœ์ƒ๋˜์—ˆ๋‹ค. ํœจ ๊ท ์—ด์ด ์•ˆ์ •ํ™” ์ƒํƒœ์— ๋Œ์ž…ํ•œ ํ›„ ํœจ ์ „๋‹จ ์ง€๊ฐ„์— ์œ„์น˜ํ•œ ํœจ ๊ท ์—ด์˜ ์ƒ๋‹จ์ด ํ•˜์ค‘์žฌํ•˜์ ์œผ๋กœ ํ–ฅํ•˜๋Š” ๊ฒฝ์‚ฌ ๊ท ์—ด๋กœ ๋ฐœ์ „ํ•˜๊ณ  ์‹œํ—˜์ฒด์˜ ์ฒ˜์ง์ด ์ฆ๊ฐ€ํ•˜๋ฉด์„œ ์ดˆ๊ธฐ๊ท ์—ด์ด ํ™•๋Œ€๋˜๋ฉฐ, ์ค‘๋ฆฝ์ถ• ๋ฐฉํ–ฅ์œผ๋กœ ๊นŠ๊ฒŒ ์—ฐ์žฅ๋˜๋ฉด์„œ ํœจ ํŒŒ๊ดด๊ฐ€ ๋ฐœ์ƒํ•˜์˜€๋‹ค.

Fig. 12

Crack patterns of the CFP pile

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(b)CFP-N-N (2) ์‹œํ—˜์ฒด์˜ ๊ท ์—ด์–‘์ƒ์€ ๊ฒฝ๊ฐ„์ค‘์•™๋ถ€์—์„œ ์ตœ์ดˆ ๊ท ์—ด์ด ๋ฐœ๊ฒฌ๋˜์—ˆ๊ณ  ๊ทธ ํ›„ ํ•˜์ค‘ ์žฌํ•˜์  2๊ณณ์—์„œ๋„ ๊ท ์—ด์ด ๋‚˜ํƒ€๋‚˜๋ฉฐ, ์žฌํ•˜์  ๋‚ด๋ถ€์— ์—ฌ๋Ÿฌ ๊ฐœ์˜ ์ถ”๊ฐ€ ๊ท ์—ด์ด ๊ด€์ฐฐ๋˜์—ˆ๋‹ค. ํŒŒ๊ดด ํŒจํ„ด์€ CFP-N-N (1)๊ณผ ๊ฐ™์ด ์ค‘์•™๋ถ€ ๋ฐœ์ƒ ๊ท ์—ด ํญ์˜ ํ™•๋Œ€์™€ ๊ท ์—ด ๊นŠ์ด๊ฐ€ ๊นŠ๊ฒŒ ์—ฐ์žฅ๋˜๋ฉด์„œ ํŒŒ๊ดด ๋˜์—ˆ์œผ๋‚˜, ํœจโ€ค์ „๋‹จ ๊ตฌ๊ฐ„์˜ ๊ท ์—ด์€ ํ•˜์ค‘์žฌํ•˜์  ๋ฐฉํ–ฅ์œผ๋กœ ๊ฒฝ์‚ฌ์ง€๋Š” ์–‘์ƒ์„ ๋ณด์ด์ง€ ์•Š์•˜์œผ๋ฉฐ, ์ด๋Š” CFP-N-N (1)์— ๋น„ํ•ด ๊ท ์—ด์ˆ˜๊ฐ€ ๋งŽ์•„์ ธ ์ค‘์‹ฌ์ถ•์ด์ƒ๊นŒ์ง€ ๊ท ์—ด์ด ํ™•๋Œ€๋˜์ง€ ๋ชปํ•˜๊ณ  ์ˆ˜์ง ๊ท ์—ด๋งŒ์„ ๋ณด์ด๋ฉฐ ํŒŒ๊ดด๋˜์—ˆ๊ธฐ ๋•Œ๋ฌธ์ด๋ผ ์ƒ๊ฐ๋œ๋‹ค.

(c)CFP-13-N (1)์˜ ์ดˆ๊ธฐ ๊ท ์—ด์€ ๊ฒฝ๊ฐ„์ค‘์•™๋ถ€์—์„œ ๋ฐœ์ƒํ•˜์—ฌ ํœจ ๊ท ์—ด์˜ ๋ถ„ํฌ๊ฐ€ ์ ์ฐจ์ ์œผ๋กœ ์ง€์ ๋ถ€๋กœ ๋ฐœ๋‹ฌํ•ด๊ฐ€๋ฉด์„œ ํœจ ๊ตฌ๊ฐ„ ๋ฐ ํœจ ์ „๋‹จ ๊ตฌ๊ฐ„์— ๊ฑธ์ณ ์•ฝ 3.5m ์ด๋‚ด์— ๊ท ์—ด๋ถ„ํฌ๋ฅผ ๋ณด์˜€์œผ๋ฉฐ, ์ตœ๋Œ€ ํ•˜์ค‘์žฌํ•˜ ์‹œ CFP๋ง๋š์˜ ์ตœ๊ณ  ๋ณ€์œ„๊ฐ€ ๋ฐœ์ƒํ•˜๋ฉด์„œ ์••์ถ•๋ถ€์—์„œ ์••์ถ• ์‘๋ ฅ์„ ๋ฐ›์•„ ์••๊ดด ๋ณ€ํ˜•์„ ์ผ์œผํ‚ค๋ฉฐ ํœจ ํŒŒ๊ดด๊ฐ€ ๋ฐœ์ƒํ•˜์˜€๋‹ค.

(d)CFP-13-N (2)์˜ ์ดˆ๊ธฐ ๊ท ์—ด์€ ๊ฒฝ๊ฐ„์ค‘์•™๋ถ€์—์„œ ๋ฐœ์ƒํ•˜๋ฉด์„œ CFP-13-N (1)๊ณผ ์œ ์‚ฌํ•œ ๊ท ์—ดํŒจํ„ด์„ ๋ณด์˜€์œผ๋ฉฐ, ์ตœ๋Œ€ ํ•˜์ค‘์žฌํ•˜ ์‹œ CFP-N-N ์‹œํ—˜์ฒด๋“ค์˜ ๊ท ์—ด ํŒจํ„ด๊ณผ ๋‹ฌ๋ฆฌ ์‹œํ—˜์ฒด ์ค‘์•™ ๊ฒฝ๊ฐ„์— ๋ฐœ์ƒํ•œ ๊ท ์—ด์˜ ํญ, ๊นŠ์ด๋กœ ํ™•๋Œ€๋˜๋Š” ์–‘์ƒ์€ ๋ณด์ด์ง€ ์•Š๊ณ  ๊ท ์—ด ๊ฐ„๊ฒฉ์ด ์ข์•„์ง€๋ฉฐ ๋งŽ์€ ๋ฏธ์„ธ ๊ท ์—ด์ด ๋ฐœ์ƒ๋˜์—ˆ๋‹ค. CFP-13-N (1) ์‹œํ—˜์ฒด์™€ ๊ฐ™์ด ์••์ถ•๋ถ€์˜ ์••๊ดด ๋ณ€ํ˜•์„ ์ผ์œผํ‚ค๋ฉฐ ์ตœ์ข… ํŒŒ๊ดด๊ฐ€ ๋ฐœ์ƒํ•˜์˜€์œผ๋ฉฐ, ์ด๋Š” 1์ฐจ ์ฒ ๊ทผ๋ณด๊ฐ•์œผ๋กœ CFP๋ง๋š์˜ ํœจ ์‘๋ ฅ ์ฆ๊ฐ€์— ๋”ฐ๋ฅธ ๊ฒƒ์œผ๋กœ ์—ฌ๊ฒจ์ง„๋‹ค.

(e)CFP-13-19 (1) ์‹œํ—˜์ฒด๋„ ์ดˆ๊ธฐ ๊ท ์—ดํŒจํ„ด์€ CFP-13- N ์‹œํ—˜์ฒด๋“ค๊ณผ ์œ ์‚ฌํ•œ ์–‘์ƒ์„ ๋ณด์˜€๊ณ  ํ•˜์ค‘์ด ์ฆ๊ฐ€ํ•จ์— ๋”ฐ๋ผ ํœจ ๊ท ์—ด์ด ์‹œํ—˜์ฒด ์••์ถ•๋ถ€๋กœ ํ™•๋Œ€๋˜๋ฉด์„œ ๊ฒฝ์‚ฌ๊ท ์—ด๋กœ ์ด์–ด์ง€๋Š” ํœจ ์ „๋‹จ ๊ท ์—ด์ด ๋ฐœ์ƒ๋˜๋ฉฐ, ์‹œํ—˜์ฒด ์••์ถ•๋ถ€์—์„œ ์••๊ดด ๋ณ€ํ˜•์„ ์ผ์œผํ‚ค๋ฉฐ ํŒŒ๊ดด๋˜์—ˆ๋‹ค.

(f)CFP-13-19 (2) ์‹œํ—˜์ฒด ๋˜ํ•œ ๊ฒฝ๊ฐ„ ์ค‘์•™ ์ธ์žฅ๋ถ€์—์„œ ์ดˆ๊ธฐ ๊ท ์—ด์ด ๋ฐœ์ƒํ•˜์˜€๊ณ  ์•ฝ 4m ์ด๋‚ด์—์„œ ๋ชจ๋“  ๊ท ์—ด์ด ๋ฐœ์ƒํ•˜์˜€์œผ๋ฉฐ, ์ˆ˜์ง ํ•˜์ค‘์— ๋Œ€ํ•œ ๊ท ์—ด์ด ์••์ถ•๋ถ€๋กœ ํ™•๋Œ€๋˜๋ฉด์„œ ์••์ถ•๋ถ€์—์„œ ์••๊ดด ๋ณ€ํ˜•์„ ์ผ์œผํ‚ค๋ฉฐ ํŒŒ๊ดด๋˜์—ˆ๋‹ค. ๋ณธ ์‹œํ—˜์ฒด๋Š” CFP-13-19 (1) ์‹œํ—˜์ฒด์™€ ๊ฐ™์ด 2์ฐจ ๋ณด๊ฐ•์ฒ ๊ทผ์˜ ๋ฐฐ์น˜๋กœ ์ดˆ๊ธฐ ๊ท ์—ด ๋ฐœ์ƒ ํ›„ ๋ณ€ํ˜•์„ฑ๋Šฅ์ด ๊ธฐ์กด ์‹œํ—˜์ฒด๋“ค์— ๋น„ํ•ด ๊ฐ€์žฅ ์šฐ์ˆ˜ํ•˜๊ฒŒ ๋‚˜ํƒ€๋‚ฌ๋‹ค.

5.2 ํ•˜์ค‘-์ฒ˜์ง ๊ด€๊ณ„

์‹œํ—˜์ฒด ํŒŒ๊ดด ์–‘์ƒ๊ณผ ์ตœ๋Œ€ ํ•˜์ค‘์€ Fig. 13๊ณผ ๊ฐ™์ด ๋™์ผ ์‹œํ—˜์ฒด๋ณ„๋กœ ์œ ์‚ฌํ•œ ํ•˜์ค‘-๋ณ€์œ„ ๊ณก์„  ๋ถ„ํฌ๋ฅผ ๋‚˜ํƒ€๋ƒˆ์œผ๋ฉฐ, Fig. 13์˜ ๊ฐ ์‹œํ—˜์ฒด๋ณ„ ๊ณก์„ ์—์„œ ๋‚˜ํƒ€๋‚œ ๋ณ€๊ณก์ ๊ณผ ์ตœ์ข… ํŒŒ๊ดดํ•˜์ค‘์€ Table 7๊ณผ ๊ฐ™๋‹ค.

Fig. 13

Loadโ€“Deflection curves

/Resources/kci/JKCI.2017.29.4.353/images/Figure_CONCRETE_29_04_03_F13.jpg

Table 7 Specimen inflection point load

/Resources/kci/JKCI.2017.29.4.353/images/Table_CONCRETE_29_04_03_T7.jpg

ํ•˜์ค‘-์ฒ˜์ง ๊ณก์„ ์˜ ์ฒซ ๋ฒˆ์งธ ๋ณ€๊ณก์ ์€ ์ดˆ๊ธฐ ๊ท ์—ด ๋ฐœ์ƒ์— ๋”ฐ๋ฅธ ์ฒ˜์ง๋Ÿ‰ ์ฆ๊ฐ€์— ๋”ฐ๋ฅธ ๊ฒƒ์ด๋ฉฐ, ๋‘ ๋ฒˆ์งธ ๋ณ€๊ณก์ ์€ ์ดํ˜• ๊ฐ•์—ฐ์„ , ๋ณด๊ฐ•์ฒ ๊ทผ๊ณผ ์ฝ˜ํฌ๋ฆฌํŠธ์˜ ์Šฌ๋ฆฝ์— ์˜ํ•œ ์ฒ˜์ง ์ฆ๊ฐ€๋กœ ๋‚˜ํƒ€๋‚œ ๊ณก์„  ๊ธฐ์šธ๊ธฐ์˜ ๋ณ€ํ™”๋กœ ์ƒ๊ฐ๋œ๋‹ค.

์‹œํ—˜์ฒด CFP-N-N (1), CFP-N-N (2)๋Š” ์ดˆ๊ธฐ ๊ท ์—ด ํ•˜์ค‘ ํ‰๊ท ์€ 111.3kN์ด๊ณ , ๊ฐ•์žฌ์˜ ์Šฌ๋ฆฝ ๋ฐœ์ƒ ํ•˜์ค‘์˜ ํ‰๊ท ์€ 178.5kN, ์ตœ์ข… ํŒŒ๊ดดํ•˜์ค‘ ํ‰๊ท ์€ 234.4kN์œผ๋กœ ๋‚˜ํƒ€๋‚ฌ๋‹ค.

CFP-13-N (1), CFP-13-N (2) ์‹œํ—˜์ฒด๋Š” ์ดˆ๊ธฐ ๊ท ์—ด ํ‰๊ท  ํ•˜์ค‘์ด 129.4kN, ๊ฐ•์žฌ ์Šฌ๋ฆฝ ๋ฐœ์ƒ ํ‰๊ท  ํ•˜์ค‘์€ 272.2kN, ์ตœ์ข… ํŒŒ๊ดด ํ‰๊ท  ํ•˜์ค‘์€ 343.2kN์œผ๋กœ CFP-N-N ์‹œํ—˜์ฒด๋ณด๋‹ค ์•ฝ 16.2%, 52.5%, 46.4% ๋กœ ๋†’๊ฒŒ ๋‚˜ํƒ€๋‚ฌ๋‹ค.

CFP-13-N (1), CFP-13-N (2) ์‹œํ—˜์ฒด๋Š” ์ดˆ๊ธฐ ๊ท ์—ด ํ‰๊ท  ํ•˜์ค‘์ด 129.4kN, ๊ฐ•์žฌ ์Šฌ๋ฆฝ ๋ฐœ์ƒ ํ‰๊ท  ํ•˜์ค‘์€ 272.2kN, ์ตœ์ข… ํŒŒ๊ดด ํ‰๊ท  ํ•˜์ค‘์€ 343.2kN์œผ๋กœ CFP-N-N ์‹œํ—˜์ฒด๋ณด๋‹ค ์•ฝ 16.2%, 52.5%, 46.4% ๋กœ ๋†’๊ฒŒ ๋‚˜ํƒ€๋‚ฌ๋‹ค.

CFP-13-19 (1), CFP-13-19 (2)์˜ ์ดˆ๊ธฐ ๊ท ์—ด ํ‰๊ท  ํ•˜์ค‘์€ 151.2kN, ๊ฐ•์žฌ ์Šฌ๋ฆฝ ๋ฐœ์ƒ ํ‰๊ท  ํ•˜์ค‘์€ 409.6kN, ์ตœ์ข… ํŒŒ๊ดดํ•˜์ค‘ ํ‰๊ท ์€ 478.0kN์œผ๋กœ CFP-N-N ์‹œํ—˜์ฒด๋ณด๋‹ค ์•ฝ 35.9%, 129.4%, 103.9%๋กœ ๋†’๊ฒŒ ๋‚˜ํƒ€๋‚ฌ๋‹ค.

5.3 ์„ค๊ณ„์™€ ์‹คํ—˜ ๊ฒฐ๊ณผ ๋น„๊ต

ํœจ ์‹คํ—˜์„ ํ†ตํ•ด ์–ป์–ด์ง„ ์‹œํ—˜์ฒด๋ณ„ ํœจ๋ชจ๋ฉ˜ํŠธ์™€ CFP๋ง๋š์˜ P-M ๊ณ„์‚ฐ๋ฒ•์œผ๋กœ ์‚ฐ์ถœ๋œ ํœจ๋ชจ๋ฉ˜ํŠธ๋Š” Table 8๊ณผ ๊ฐ™๋‹ค. PHC๋ง๋š(D500)์˜ ๊ท ์—ด ํœจ๋ชจ๋ฉ˜ํŠธ์™€ ๊ธฐ์ค€ ํœจ๋ชจ๋ฉ˜ํŠธ๋Š” ๊ฐ๊ฐ 103.0kNยทm, 155.0kNยทm๋กœ CFP๋ง๋š์˜ ๊ฐ ์‹œํ—˜์ฒด๊ฐ€ ๊ฐ–๋Š” ํœจ๋ชจ๋ฉ˜ํŠธ๊ฐ€ KS ๋ง๋š ๊ธฐ์ค€ ๋Œ€๋น„ ๊ท ์—ด ํœจ ๋ชจ๋ฉ˜ํŠธ๋Š” 1.08โˆผ1.51๋ฐฐ ๊ทธ๋ฆฌ๊ณ  ํŒŒ๊ดด ํœจ๋ชจ๋ฉ˜ํŠธ๋Š” 1.43โˆผ2.99๋ฐฐ ๋†’๊ฒŒ ๋‚˜ํƒ€๋‚˜ ๋ณด๊ฐ•์ฒ ๊ทผ ๋ฐฐ์น˜๋ฅผ ํ†ตํ•ด ํœจ ์„ฑ๋Šฅ์ด ํ–ฅ์ƒ๋œ ๊ฒƒ์„ ๋ณผ ์ˆ˜ ์žˆ๋‹ค. ๋˜ํ•œ, ์‹คํ—˜์„ ํ†ตํ•ด ์–ป์€ ๊ท ์—ด ํœจ ๋ชจ๋ฉ˜ํŠธ์™€ PHC๋ง๋š๊ณผ ๋™์ผํ•œ ์•ˆ์ „์œจ์„ ์ ์šฉํ•œ CFP๋ง๋š์˜ P-M์ƒ๊ด€๋„์˜ ํœจ๋ชจ๋ฉ˜ํŠธ ๋น„๋Š” 1.55โˆผ2.47๋ฐฐ๋กœ ๋‚˜ํƒ€๋‚ฌ๋‹ค.

Table 8 Comparison between measured and predicted flexural strengths

/Resources/kci/JKCI.2017.29.4.353/images/Table_CONCRETE_29_04_03_T8.jpg

์‚ฌ์šฉํ•œ๊ณ„์ƒํƒœ์—์„œ CFP-N-N, CFP-13-N, CFP-13-19 ์‹œํ—˜์ฒด๋ณ„ ํœจ๋ชจ๋ฉ˜ํŠธ ์•ˆ์ „์œจ์€ ๊ฐ๊ฐ 1.12, 1.23, 1.15๋กœ ๋‚˜ํƒ€๋‚˜ ํ•œ๊ณ„์ƒํƒœ์„ค๊ณ„๋ฒ•์˜ ํœจ ๋ชจ๋ฉ˜ํŠธ ์˜ˆ์ธก๊ฐ’์ด ์‹คํ—˜๊ฐ’๊ณผ ์œ ์‚ฌํ•˜๊ฒŒ ๋‚˜ํƒ€๋‚˜ ํ•ฉ๋ฆฌ์ ์ธ ์˜ˆ์ธก์ด ๊ฐ€๋Šฅํ•  ๊ฒƒ์œผ๋กœ ํŒ๋‹จ๋œ๋‹ค. ๋˜ํ•œ ๊ทน๋‹จ์ƒํ™ฉํ•œ๊ณ„์ƒํƒœ์—์„œ์˜ ์‹œํ—˜์ฒด๋ณ„ ์•ˆ์ „์œจ์€ 1.14, 1.27, 1.20๋กœ ๋‚˜ํƒ€๋‚ฌ์œผ๋ฉฐ, ๊ทนํ•œํ•œ๊ณ„์ƒํƒœ์—์„œ ์•ˆ์ „์œจ์€ 1.24, 1.39, 1.33์œผ๋กœ ๋‚˜ํƒ€๋‚˜ ์„ค๊ณ„์ ์šฉ์— ๋”ฐ๋ฅธ ์ถฉ๋ถ„ํ•œ ์•ˆ์ „์œจ์„ ํ™•๋ณดํ•˜๊ณ  ์žˆ๋Š” ๊ฒƒ์œผ๋กœ ์ƒ๊ฐ๋œ๋‹ค.

6. ๊ฒฐ    ๋ก 

๋ณธ ์—ฐ๊ตฌ์—์„œ๋Š” PHC๋ง๋š์„ ๋ณด๊ฐ•ํ•œ CFP๋ง๋š์ด ๊ฐ–๋Š” ๋ณด๊ฐ• ๋‹จ๊ณ„๋ณ„ ํœจ ์„ฑ๋Šฅ ํ‰๊ฐ€๋ฅผ ์ˆ˜ํ–‰ํ•˜๊ณ , P-M ์„ค๊ณ„๋ฒ•์— ์˜ํ•œ ํœจ๋ชจ๋ฉ˜ํŠธ ์˜ˆ์ธก๊ณผ ์‹คํ—˜๊ฐ’๊ณผ์˜ ๋น„๊ต ํ‰๊ฐ€๋ฅผ ์ˆ˜ํ–‰ํ•˜์˜€๋‹ค.

1)์‹คํ—˜๊ฒฐ๊ณผ ๋ชจ๋“  ์‹คํ—˜์ฒด๋Š” ์ดˆ๊ธฐ๊ท ์—ด ๋ฐœ์ƒ ํ›„ ๊ท ์—ด์˜ ์ฆ๊ฐ€์™€ ๊ท ์—ด ํญ์ด ํ™•๋Œ€๋˜๊ณ , ์ค‘๋ฆฝ์ถ• ๋ฐฉํ–ฅ์œผ๋กœ ๊นŠ๊ฒŒ ์—ฐ์žฅ๋˜๋ฉด์„œ ํœจ ํŒŒ๊ดด๊ฐ€ ๋ฐœ์ƒํ•˜๋Š” ์–‘์ƒ์„ ๋ณด์˜€๋‹ค.

2)๊ฐ ์‹œํ—˜์ฒด๋ณ„ ์ฒซ ๋ฒˆ์งธ ๋ณด๊ฐ•๋‹จ๊ณ„์™€ ๋‘ ๋ฒˆ์งธ ๋ณด๊ฐ•๋‹จ๊ณ„์— ๋”ฐ๋ฅธ ํ•˜์ค‘ ์ฆ๊ฐ€์œจ์€ ์ดˆ๊ธฐ๊ท ์—ดํ•˜์ค‘์— ๋Œ€ํ•ด์„œ 16.2%, 16.9%, ๊ฐ•์žฌ ์Šฌ๋ฆฝ ํ•˜์ค‘์— ๋Œ€ํ•ด์„œ 52.5%, 50.5% ๊ทธ๋ฆฌ๊ณ  ์ตœ๊ณ  ํ•˜์ค‘์— ๋Œ€ํ•ด์„œ๋Š” 46.4%, 39.3%๋กœ์˜ ์ฆ๊ฐ€์œจ์„ ๋ณด์˜€์œผ๋ฉฐ, ์žฌํ•˜ ํ•˜์ค‘์— ๋”ฐ๋ฅธ ๋ณด๊ฐ• ์ฒ ๊ทผ๋Ÿ‰์˜ ์ตœ์  ๋ฐฐ์น˜๊ฐ€ ๊ฐ€๋Šฅํ•  ๊ฒƒ์œผ๋กœ ์ƒ๊ฐ๋œ๋‹ค.

3)CFP๋ง๋š์˜ ํœจ ์„ฑ๋Šฅ ํ‰๊ฐ€ ์‹คํ—˜๊ฒฐ๊ณผ ๋ชจ๋“  ์‹œํ—˜์ฒด์—์„œ ๋ณด๊ฐ•์ฒ ๊ทผ๋Ÿ‰์— ๋”ฐ๋ฅธ ์—ฐ์„ฑ๋Šฅ๋ ฅ ์ฆ๋Œ€์™€ ์ „ํ˜•์ ์ธ ํœจ ๊ท ์—ด ํŒจํ„ด์„ ๋ณด์ด๋ฉฐ ์‹œํ—˜์ฒด๊ฐ€ ํŒŒ๊ดด๋˜์—ˆ๋‹ค.

4)PHC๋ง๋š์˜ ๊ธฐ์ค€ ํœจ๋ชจ๋ฉ˜ํŠธ๋Š” 155.0kNยทm๋กœ CFP๋ง๋š์ด ๊ฐ–๋Š” ํœจ๋ชจ๋ฉ˜ํŠธ๊ฐ€ KS ๋ง๋š ๊ธฐ์ค€ ๋Œ€๋น„ 1.43โˆผ2.99๋ฐฐ ํ–ฅ์ƒ๋œ ๊ฒƒ์„ ๋ณผ ์ˆ˜ ์žˆ๋‹ค.

5)CFP๋ง๋š์˜ ์ตœ๋Œ€ ํœจ๋ชจ๋ฉ˜ํŠธ ์˜ˆ์ธก๊ฐ’์„ ํœจ ์‹คํ—˜์— ์˜ํ•ด ๊ตฌํ•œ ์ตœ๋Œ€ ํœจ๋ชจ๋ฉ˜ํŠธ์™€ ๋น„๊ตํ•ด ๋ณผ ๋•Œ, ๊ฐ ๋ณด๊ฐ• ๋‹จ๊ณ„๋ณ„ 1.23โˆผ1.40๋ฐฐ์˜ ์•ˆ์ „์œจ์„ ๊ฐ–๋Š” ๊ฒƒ์œผ๋กœ ๋‚˜ํƒ€๋‚˜, ๋ณธ ์—ฐ๊ตฌ์—์„œ ์ œ์‹œํ•œ ์„ค๊ณ„๋ฒ•์— ์˜ํ•ด CFP๋ง๋š์˜ P-M ๊ณ„์‚ฐ๋ฒ•์€ ํ•ฉ๋ฆฌ์ ์ธ ๊ฒƒ์œผ๋กœ ํŒ๋‹จ๋˜๋ฉฐ, CFP๋ง๋š์— ํ•„์š”ํ•œ ํœจ ๋‚ด๋ ฅ ์‚ฐ์ •์‹œ ๋ณด๊ฐ•์ฒ ๊ทผ๋Ÿ‰์˜ ๋ณ€ํ™”๋ฅผ ํ†ตํ•œ ์ตœ์  ์„ค๊ณ„๋กœ ๊ฒฝ์ œ์„ฑ ํ™•๋ณด๊ฐ€ ๊ฐ€๋Šฅํ•  ๊ฒƒ์œผ๋กœ ์ƒ๊ฐ๋œ๋‹ค.

6)CFP๋ง๋š์˜ ์‹œํ—˜์ฒด์˜ ๊ท ์—ด ํœจ ๋ชจ๋ฉ˜ํŠธ(/Resources/kci/JKCI.2017.29.4.353/images/PICE4FC.gif)์™€ ํ—ˆ์šฉ์‘๋ ฅ์„ค๊ณ„๋ฒ•์„ ์ ์šฉํ•˜๋Š” PHC๋ง๋š๊ณผ ๋™์ผํ•œ ์•ˆ์ „์œจ์„ ๊ฐ–๋„๋ก ํ•œ CFP๋ง๋š์˜ P-M์ƒ๊ด€๋„์˜ ํœจ๋ชจ๋ฉ˜ํŠธ ๋น„๋Š” 1.55โˆผ2.47๋ฐฐ๋กœ ๋‚˜ํƒ€๋‚ฌ๋‹ค.

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