34 4 2014 8 EARTHQUAKE ENGINEERING AND ENGINEERING DYNAMICS Vol. 34 No. 4 Aug. 2014 1000-1301 2014 04-0154 - 08 DOI 10. 13197 /j. eeev. 2014. 04. 154. dangxl. 020 200092 TU375 P315. 92 A Experimental study and numerical simulation of self-centering shear walls with horizontal bottom slit DANG Xiangliang LU Xilin ZHOU Ying State Key Laboratory of Disaster Reduction in Civil Engineering Tongji University Shanghai 200092 China Abstract Horizontal slits are placed symmetrically at the wall ends between the wall-foundation interface of prestressed shear walls and the concrete in the middle of the wall remains connected. Furthermore unbonded prestressed tendon is introduced inside the wall to provide self-centering ability. Testing of pre-stressed self-centering shear walls with horizontal bottom slit under cyclic loading was conducted to study the mechanic characteristic of these shear walls. Failure pattern hysteretic curves skeleton curves and energy dissipating ability were obtained from the test and the contrast was made among the normal shear wall the traditional rocking shear wall and the selfcentering shear walls with horizontal bottom slit. Furthermore numerical simulation was made for the shear wall with bottom slit. The results indicate that the shear walls with bottom slit behave with excellent self-centering ability while remain lateral load capacity as normal shear wall. And the energy dissipating ability of the new type wall is better than traditional rocking shear wall. The number and size of the cracking in the walls were largely reduced and the shear walls were protected from being damaged. And the numerical simulation results fit well with the experimental results. Key words bottom slits pre-stressed self-centering shear wall experimental study numerical simulation 2014-04 - 24 2014-06 - 02 51261120377 1988 -. E-mail dangxiangliang@ gmail. com 1955 -. E-mail lxlst@ tongji. edu. cn
4 155 earthquake resilient structure 1 Yahya Kurama 2 Bulent Erkmen 3 Jose Restrepo 4 Brian Smith 5 6 7 1 8 C40 HRB400 1860 2 000 mm 1 000 mm 125 mm 2 2 300 mm 1 2 1 2 SW1-1 Fig. 1 Sketch of the self-centering shear wall Fig. 2 Reinforcement details of a typical specimen SW1-1 specimen with horizontal bottom slit
156 34 1. 1 1 SW0 SW1-3 1 Table 1 Parameters of specimens mm mm MPa SW0 2 SW1-3 420 2 450 SW1-1 180 420 2 450 SW1-2 360 420 2 450 SW2-1 180 220 2 450 SW2-2 180 420 & 220 4 450 SW3-1 180 420 2 150 SW3-2 180 420 2 750 14 6 0 3 3 Fig. 3 Sketch of steel bar shear keys 4 Fig. 4 Sketch of test setup 1. 2 4 SW2-2 370 kn SW2-2 240 kn 1 mm 0. 5 4 85% 8 SW0 SW0 8 mm
4 157 2 SW0 SW1-1 SW1-3 SW1-1 SW0 SW1-1 SW1-3 40 mm θ = 1 /58 5 6 5 40 mm θ = 1 /58 Fig. 5 Cracks of specimens at 40 mm displacement θ = 1 /58 6 Fig. 6 Failure pattern of specimens 3 3. 1 7
158 34 SW0 7 Fig. 7 Hysteretic curves SW0 2 9 SW1-3 3. 2-8 7 8 a SW1-1 SW0 SW1-1 3 SW1-2 SW1-3 SW1-1 8 b
4 159 SW2-2 SW1-1 SW2-2 8 c SW3-2 8 Fig. 8 Skeleton curves 3. 3 10 S BEDF h e = 1 2πS OAB + S OCD S BEDF 9 a S OAB S OCD 9 b c d Fig. 9 9 Equivalent viscous damping coefficient
160 34 9 b 9 c SW2-1 SW2-2 SW1-1 SW2-2 9 d 4 ABAQUS 7 7 Truss 7 Hard contact cohesive behavior 10 Fig. 10 10 The contrast of skeleton curves between experiment and simulation
4 161 5 1 2 3 4 5 1. J. 2011 39 7 941-948. LU Xilin CHEN Yun MAO Yuanjun. New concept of structural seismic design earthquake resilient structures J. Journal of Tongji University Natural Science 2011 39 7 941-948. in Chinese 2 Kurama Y C Sause R Pessiki S et al. Lateral load behavior and seismic design of unbonded post-tensioned precast concrete walls J. ACI Structural Journal 1999 96 4 622-633. 3 Erkmen B Schultz A E. Self-centering behavior of unbonded post-tensioned precast concrete shear walls J. Journal of Earthquake Engineering 2009 13 7 1047-1064. 4 Restrepo J I Rahman A. Seismic performance of self-centering structural walls incorporating energy dissipators J. Journal of Structural Engineering 2007 133 11 1560-1570. 5 Smith B J. Design analysis and experimental evaluation of hybrid precast concrete shear walls for seismic regions D. Indiana University of Notre Dame 2012. 6. J. 2010 30 6 631-636. CHEN Shicai YAN Weiming LI Zhenbao et al. Finite element study on mechanical behavior of the post-tensioned rocking shear walls with bottom slits J. Journal of Disaster Prevention and Mitigation Engineering 2010 30 6 631-636. in Chinese 7. J. 2013 33 5 182-189. DANG Xiangliang LU Xilin ZHOU Ying. Study on seismic performance of a rocking wall with bottom horizontal slits J. Journal of Earthquake Engineering and Engineering Vibration 2013 33 5 182-189. in Chinese 8 JGJ 101-1996 S. 1997. JGJ 101-1996 Specificating of Testing Methods for Earthquake Resistant Building S. Beijing China Building Industry Press 1997. in Chinese 9 Perez F J Sause R Pessiki S. Analytical and experimental lateral load behavior of unbonded posttensioned precast concrete walls J. Journal of Structural Engineering 2007 133 11 1531-1540. 10. M. 2004. LI Zhongxian. Theory and technique of engineering structure experiments M. Tianjin Tianjin University Press 2004. in Chinese