Experimental study on seismic behavior of self-centering shear wall reinforced #br# with shape memory alloy bars and engineered cementitious composites
Qian Hui1 Kang Liping1 Guo Yuancheng1 Li Zongao1 Shamim A Sheikh1，2
1. Zhengzhou University, Zhengzhou 450001,China；2. Unirersity of Toronto,Toronto M5S 2E8,Canada
Abstract：As a widely used structural member of bearing lateral shear force in high-rise buildings, the shear wall undertakes most of the horizontal seismic action of the structure. Therefore, the mechanical behavior of shear wall may significantly affect the seismic performance of the whole building structure. To improve the deformability and self-repairing ability, reduce the damage and residual deformation and realize rapid recovery of the structure after earthquake, an innovative shear wall with self-centering capability was proposed in this study. In the plastic hinge zone of the self-centering shear wall, the longitudinal reinforcements were replaced by shape memory alloys (SMA) bars and ordinary concrete was replaced by engineered cementitious composites (ECC). Hence, the selfcentering ability of the shear wall can be achieved through SMA and the problem of brittle damage of concrete can be resolved by ECC. To inspect the seismic performance of the new type shear wall, four specimens, namely ordinary reinforced concrete shear wall, ECC reinforced shear wall with high ductility, superelastic SMA reinforced shear wall and shear wall reinforced by integrated SMA and ECC, were designed and manufactured. Based on the low cyclic loading test, the failure characteristics, bearing capacity, self-centering ability, ductility and energy dissipation ability-of the shear wall specimens were comparatively analyzed. The research results indicated that compared with the ordinary specimen, SMA-ECC shear wall was less damaged and with the rapid recovery function. Particularly, the self-centering capability was remarkable and probably more than 85%. In addition, it also possessed good ductility.
