w w l v e p ƒ ü x mw sƒw. ü w v e p p ƒ w ƒ w š (½kz, 2005; ½xy, 2007). ù w l w gv ¾ y w ww.» w v e p p ƒ(½kz, 2008a; ½kz, 2008b) gv w x w x, w mw gv

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1 ª Œª Œ 30ƒ 5A Á œ pp. 475 ~ 484 gj p ª v e p p PSC ƒ gv : II. x w Precast Concrete Copings for Precast Segmental PSC Bridge Columns : II. Experiments and Analyses ½kzÁ½ Á zá x Kim, Tae-HoonÁKim, Young-JinÁLee, Jae-HoonÁShin, Hyun-Mock Abstract The purpose of this study is to investigate the inelastic behavior of precast concrete copings for precast segmental PSC bridge columns and to provide the details and reference data. Twelve one-fourth-scale precast concrete copings were tested under quasistatic monotonic loading. In this study, the computer program, named RCAHEST (Reinforced Concrete Analysis in Higher Evaluation System Technology), was used. A joint element is modified to predict the inelastic behaviors of segmental joints. This study documents the testing of precast concrete copings for precast segmental PSC bridge columns and presents conclusions based on the experimental and analytical findings. Keywords : inelastic behavior, precast concrete copings, precast segmental PSC bridge columns, computer program, joint element v e p p PSC ƒ gv k q wš w» œ w. 12 gv x ƒ w w q x ww. v gj p w w RCAHEST. w p w k dw. v e p p PSC ƒ gv x, w w. w : k, gv, v e p p PSC ƒ, v, w 1. (½kz, 2010) v e p p PSC ƒ gv w ü. gv ee q w p ¼ mw z w ¼ wš p w w w y w j w gv y j œ» jš œ w k. w v e p w x k w t w k» x k gv w. œ š w y k gv x x, w mw gv y w š w. v e p p ƒ y w ƒ w š. Billington (2004) s pl w» w Fiber gj p w v e p ƒ w p sƒw. Chou (2006) w w s pl gj p w v e p ƒ w w w ü sƒw. Wang (2008) w j» w p w w w x x ww sƒw. Yamashita (2009) w z Á Á( )» Áœw ( z Á( )» Áœw z Á û w m œw Áœw z Á ³ w zy lœw Áœw 30ƒ 5A œ 475

2 w w l v e p ƒ ü x mw sƒw. ü w v e p p ƒ w ƒ w š (½kz, 2005; ½xy, 2007). ù w l w gv ¾ y w ww.» w v e p p ƒ(½kz, 2008a; ½kz, 2008b) gv w x w x, w mw gv l sƒw. gv gv y» k x y š w w. 2 k w w ³ w gj p p txwš, w w y w» v (Kim, 2003; Kim, 2005; Kim, 2007) ¼ w š w l (Kim, 2008) p w p w w w (½kz, 2007) w w. 2. v e p p PSC ƒ gv x 2.1 x x œ š w [ s j ] y k (PC) gv 8» Á w x k v p p gj p(psc) gv 4» x x (½kz, 2010)» w. gv» v p p gj p g v v e p» ƒw gv m, { m, m, j m ww. xw» (2005), gj p» (2007), š AASHTO LRFD(2004) w s j w. ¼ 2,900 mm š 650 mm š s 675 mm e w gv x (½kz, 2010) w. 2.2 x x p r» w q x ww x 250 mm 2,000 kn ƒ»(actuator) 2 ƒ. ƒ x q w» w q ew x 1/2 e mw d š w ƒ w ü,, š x» w. gv x ü s x w. š w w w ƒ» e w dw, gv w w w s w d w. 2.3 x gv x w w - š 1~ 8 ùkü x (2V d ) w q wì t w š ƒ x w w t 1 ùkü. w z w x¾ ü w š sƒw» w x w y w. x l w gj p ƒ sƒ ƒ š w - š l w (Park, 1998) w. gv x» x k v p p gj p gv x w z w x¾ ü wš y. 1. x PC-S1HS0-1 w - š 2. x PC-S1HS0-2 w - š 476 ª Œª Œ

3 3. x PC-S0HS1-1 w - š 6. x PC-S0HS0-2 w - š 4. x PC-S0HS1-2 w - š 7. x PSC-HS0-1 w - š 5. x PC-S0HS0-1 w - š 8. x PSC-HS0-2 w - š 30ƒ 5A œ 477

4 Model 2V cr (kn) t 1. x 2V u (kn) δ cr (mm) δ u (mm) PC-S1HS PC-S1HS PC-S0HS PC-S0HS PC-S0HS PC-S0HS PSC-HS PSC-HS Note : s (HS), j(s) 2.4 x w - š s j w gv x w - š 9~ 13 wì ùkü. s gv x [PC- S1HS1, PC-S1HS0] s³ x ƒƒ kn kn. gv x [PC-S0HS1, PC-S0HS0] s³ x ƒƒ kn kn. š v p p gj p gv x [PSC-HS1, PSC-HS0] s³ x ƒƒ kn kn. j gv x [PC-S1HS1, PC-S0HS1] s³ x ƒƒ kn kn. gv x [PC-S1HS0, PC-S0HS0] s ³ x ƒƒ kn kn. s gv x [PC- S1HS1, PC-S1HS0] s³ w ƒƒ 21.9 mm 31.8 mm. gv x [PC-S0HS1, PC- S0HS0] s³ w ƒƒ 25.9 mm 20.7 mm. š v p p gj p gv x [PSC-HS1, PSC-HS0] s³ w ƒƒ 31.5 mm 35.6 mm. j gv x [PC-S1HS1, 10. w - š ( s ) 11. w - š ( s ) 9. w - š ( s ) w - š ( j ) ª Œª Œ

5 13. w - š ( j ) 15. x ( s ) 14. x ( s ) 16. x ( s ) PC-S0HS1] s³ w ƒƒ 21.9 mm 25.9 mm. gv x [PC-S1HS0, PC-S0HS0] s³ w ƒƒ 31.8 mm 20.7 mm. x m gv x s ƒ j j w eš j ƒ s j w eš x 14~ 16 x r s ƒw y w. š 17, 18 x r j w y w. œ š w y k x s j gv 17. x ( j ) 30ƒ 5A œ 479

6 19. x w w v RCAHEST 18. x ( j ) x ƒ w y d x ƒ ww q. 3. v e p p PSC ƒ gv x w 3.1 w g j p s, š l (Kim, 2003; Kim, 2005; Kim, 2007; Kim, 2008) j w Taylorƒ w w w v FEAP ver. 7.2(Taylor, 2000) w y x w w v RCAHEST (Reinforced Concrete Analysis in Higher Evaluation System Technology) (½kz, 2001) p w q w w w (½kz, 2007) w w ( 19). x p w. 2 ³ 1 ³ w w ww gj p sƒ š ³, w ƒ w w š ³ w g j p sƒw. ³ w» gj p w k w k q» w tx x ³ z x w ùkù. w x w gj p ƒ, ³ ƒ w gj pƒ w š w» w ³ w w š w» w ³ z š w» w ƒ ƒ w ( 20). gj p w w z p wì z š w. ³ w w ƒƒ ü 20. ³ z gj p 480 ª Œª Œ

7 23. PC gv x 21. l trilinear 24. PSC gv x 22. Coulomb q» ƒw s³ ƒw - x w š x ùkù. w s w w z w trilinear txw. l l (bare bar) - x š l - x x w. w trilinear l - x t xw ( 21). p w q» Coulomb q» ( 22) w š w w w w txw z y (softening parameter) q ¾ w ƒ w (½kz, 2007). w w w sww s w w w. 3.2 w 23~ 25 x w w ww» w ww. (PC) gv x 23 5 p 116 ww. 8 gj p s ƒ 92, p p 6 v e p w 16, ƒ x w w» w ³ w 25. RC gv x k 7, š l š w» w l 1 ƒ. v p p gj p(psc) gv x ww. 8 gj p s ƒ 92, ƒ x w w» w ³ w k 7, š l š w» w l 1 ƒ. gj p(rc) gv x ww. 8 gj p s ƒ 92, š ƒ x w w» w ³ w k 7 ƒ. p w p w ü ƒ» (½kz, 2005) s j ƒ ƒ 60, 30 o 2.0 MPa w. š w k w x(convergence test) x (aspect ratio) w w 1.0% gj p xw w ùkù k. 26~ 32 w w w w x w w - ùküš w ƒ x wš. š» x 30ƒ 5A œ 481

8 26. PC gv x w - š 29. w - š (PC gv x ) 27. PSC gv x w - š 30. w - š (PC gv x ) 28. RC gv x w - š 31. w - š (PC gv x ) 482 ª Œª Œ

9 , š ƒ w x Áw mw p ³ w v ƒ w - š (PSC gv x ) Specimen t 2. x w Experiment 2V max (kn) (1) Analysis 2V max (kn) (3) (1)/(3) PC-S1HS PC-S1HS PC-S1HS PC-S1HS PC-S0HS PC-S0HS PC-S0HS PC-S0HS PSC-HS1-1 NA NA NA PSC-HS PSC-HS PSC-HS RC-HS RC-HS Mean 0.96 COV 0.06 w ƒ. p x w x q ƒ w q. w w w x wì w t 2 w. w w w w x /w s³ ƒ ƒƒ , w s ³ x j sƒwš ù x yw sƒwš ƒ 0.06 w gv x k p sƒwš q. gv w p w ùkü, wz w, x w l w v e p p PSC ƒ gv l k y w. 1. x w l gv x wš w š y. 2. w x w w w w x /w s³ , x wš y. mw w w» gv p txwš wz v e p p ƒ w ƒ w q. 3. gv œ w j» w s j x w wš w y w. 4. v e p p ƒ gv l x p sƒw v e p p ƒ l sƒ m y. š x ½kz, ½, ½, x (2008a) w v e p p ƒ sƒ, wm wz, wm wz, 28«Ay, pp ½kz, ½,, x (2007) Numerical Study on the Joints between Precast Post-Tensioned Segments, w gj pwz, w gj pwz, 19«1Ey, pp ½kz,, ½ (2010) v e p p PSC ƒ gv : I. l, wm wz, wm wz, 30«5Ay, pp ½kz,, ½, x (2008b) P-delta w š w v e p p PSC ƒ sƒ, w œwz, w œwz, 12«4y, pp ½kz, x (2001) Analytical Approach to Evaluate the Inelastic Behaviors of Reinforced Concrete Structures under Seismic Loads, w œwz, w œwz, 5«2y, pp ½kz,, ½, x (2005) v p p g j p ƒ k w w. w œ wz, w œwz, 9«5y, pp ½xy,, x, ½ y(2007) x ƒ ü sƒ. w œwz, w œwz, 11«3y, pp w mxz(2005)». w gj pwz(2007) gj p». AASHTO (2004) AASHTO LRFD Bridge Design Specifications, 3rd Edition. Billington, S.L. and Yoon, J.K. (2004) Cyclic response of unbonded posttensioned precast columns with ductile fiber-reinforced concrete. Journal of Bridge Engineering, ASCE, Vol. 9, No. 4, 30ƒ 5A œ 483

10 pp Chou, C.C. and Chen, Y.C. (2006) Cyclic tests of post-tensioned precast cft segmental bridge columns with unbonded strands. Earthquake Engineering and Structural Dynamics, Vol. 35, pp Kim, T.H., Kim, Y.J., Kang, H.T., and Shin, H.M. (2007) Performance assessment of reinforced concrete bridge columns using a damage index. Canadian Journal of Civil Engineering, V. 34, No. 7, pp Kim, T.H., Lee, K.M., Chung, Y.S., and Shin, H.M. (2005) Seismic damage assessment of reinforced concrete bridge columns. Engineering Structures, Vol. 27, No. 4, pp Kim, T.H., Lee, K.M., Yoon, C.Y., and Shin, H.M. (2003) Inelastic behavior and ductility capacity of reinforced concrete bridge piers under earthquake. I: Theory and Formulation. Journal of Structural Engineering, ASCE, Vol. 129, No. 9, pp Kim, T.H., Park, J.G., Kim, Y.J., and Shin, H.M. (2008) A Computational platform for seismic performance assessment of reinforced concrete bridge piers with unbonded reinforcing or prestressing bars. Computers & Concrete, Vol. 5, No. 2, pp Park, R. (1998) Ductility evaluation from laboratory and analytical testing. proc. of the ninth world conference on earthquake engineering, Tokyo-Kyoto, Japan, Vol. VII, Balkema, Rotterdam, pp Taylor, R.L. (2000) FEAP - A Finite Element Analysis Program, Version 7.2 Users Manual, Vol. 1 and Vol. 2. Wang, J.C., Ou, Y.C., Chang, K.C., and Lee, G.C. (2008) Largescale seismic tests of tall concrete bridge columns with precast segmental construction. Earthquake Engineering and Structural Dynamics, Vol. 37, pp Yamashita, R. and Sanders, D. (2009). Seismic performance of precast unbonded prestressed concrete columns. ACI Structural Journal, Vol. 106, No. 6, pp ( : / : / : ) 484 ª Œª Œ

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