Experiment on axial compressive properties of high2strength concrete column wrapped w ith CFRP

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1 Vol129 No11 GLOBAL GEOLOGY Mar : (2010) CFRP 1, 1, 2, 3 1., ; 2., ; 3., : 19 CFRP, : 1 3 CFRP 11% 21% 42%, 23% 271% 330% CFRP : CFRP; ; ; : TU528 : A do i: / j1issn Abstract: Experiment on axial compressive properties of high2strength concrete column wrapped w ith CFRP HU Zhong2jun 1, N IE Lei 1, CHEN Hui2jie 2, CHEN Zhong 3 1. College of Construction Engineering, J ilin U niversity, Changchun , China; 2. Heilongjiang B ranch of China M obile Group D esign Institute Co., L td., Harbin , China; 3. B aoding Geoengineering Investigation Institute of Hebei Province, B aoding , Hebei, China Through the axial comp ression test on 19 high2strength concrete colum ns w rapped w ith carbon fiber reinforced p lastics (CFRP), the influence of section shape and different confinement content on the strength and ductility of w rapped high2strength concrete column has been studied. The experim ental results indicate that the bearing capacity of circular specimens wrapped with 1 3 CFRP cloths was increased 11%, 21% and 42% com2 pared w ith the circular specim ens w ithout CFRP, and vertical deform ation was increased 23%, 271% and 330%, respectively. made based on this results. Key words: The calculation model of strength and ultimate strain of high2strength concrete w rapped w ith CFRP is CFRP; high2strength concrete column; axial comp ression; ductility 0 20,, C50 C60,,,,, (CFRP) CFRP,, [ 1 ] CFRP, : ; :

1 : CFRP 145 [ 2, 3 ] Lam & Teng [ 4 ] [ 5 ] CFRP,,, 19 CFRP, CFRP, CFRP, 1 CFRP, ( ), 19 CFRP 0 ( ) 1 2 3, 1 450 mm, C70, CFRP ( TORAY2 CA) 12K, CFRP 3 650 MPa, 191, 150 mm 133 mm,, [ 6 ],, 10 mm,,,

2 1 : CFRP 145 [ 2, 3 ] Lam & Teng [ 4 ] [ 5 ] CFRP,,, 19 CFRP, CFRP, CFRP, 1 CFRP, ( ), 19 CFRP 0 ( ) 1 2 3, mm, C70, CFRP ( TORAY2 CA) 12K, CFRP MPa, 191, 150 mm 133 mm,, [ 6 ],, 10 mm,,, 1 /20, 615 mm ( 1), 50 mm CFRP kn,, 222Z 20 1 F ig11 Section shapes of spec im en s 2 F ig12 Fa ilure m ode of ellipse section column 2 211, CFRP 018,, ,,,, ( 2 2Z 29) CFRP,, CFRP,,, CFRP CFRP,,,,, CFRP,,,, 2 2 Z 211 Z 214 Z 217

3 , CFRP,, 2% 55%, 14% 333% 1 3 CFRP Z223 Z 25 Z227, 11% 21% 42%, 23% 271% 330%, CFRP, Z 25 Z 214, Z225 21%, 271% ; Z %, 269%, CFRP, CFRP 213 CFRP, 3 1 /2, CFRP Z 21, 2 000, 700 ( 3), CFRP , , CFRP,, ( 3) CFRP 1 Table 1 Exper im en ta l results of concrete short column s under ax ia l com pression /kn /10-6 /10-6 Z Z Z Z Z Z Z Z Z Z Z Z Z Z Z Z Z Z Z : CFRP ; CFRP

4 1 : CFRP 147 C 2 ; cc 22 ; r 22 3 F ig13 Com par ison of spec im en s stra in s 3 CFRP, cc cc f l [ 4, 5, 7, 8 ], : cc co cc co = 1 + k 1 f 1 co = 1 + k 2 f 1 f 1 = 2f fu t f D co (1) (2) (3) : cc ; co ; f l, ( 3) ; k 1 ; cc ; co ; ; ; k 2 f fu CFRP t CFRP ; D [ 6 ] > 0107,, ,, 2,,,, k 1 k 2 ( 4) k 1 k , k 1 k

5 (1) k 1 ; (2) k 1 ; (3) k 2 ; (4) k 2 4 k 1 k 2 F ig14 Regression curves of k 1 and k 2 4 (1) CFRP, : 1 3 CFRP 11% 21% 42%, 23% 271% 330%, (2) CFRP,, ;, CFRP, (3) CFRP, CFRP, : [ 1 ] Samaan M, M irm iran A. Model of concrete confined by fiber composites [ J ]. Journal of Structural Engineering, 1998, 124 ( 9) : [ 2 ]. [ J ]., 2005, 183 (1) WANG Zhen2yu. Trend of research on high strength con2 crete column enwrapped by continuous carbon fiber sheet [ J ]. Concrete, 2005, 183 (1) [ 3 ],,,. [ J ]., 2001, 31 (3) : ZHAO Tong, X IE J ian, L IU M ing2guo, et al. Research on new method of imp roving p roperties of high strength concrete by using continuous carbon fiber sheet [ J ]. In2 dustrial Construction, 2001, 31 (3) : [ 4 ] Lam L, Teng J G. Design2oriented stress2strain model for FRP2confined concrete [ J ]. Construction and Building Materials, 2003, 17 ( 6) : [ 5 ],. FRP 2 [ J ]., 2003, 24 (5) : 129. WU Gang, LΒ Zhi2tao. Study on the stress2strain relation ship of FRP2confined concrete circular column without a strain2softening response [ J ]. Journal of Building Struc2 tures, 2003, 24 ( 5) : 129. ( 174 )

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