Experimental investigation on seismic behaviors of concrete shear #br#
wall with prefabricated composite shell-form system
Zhao Yong1 Wu Zhiwei1 Xie Zhuowen2 Wang Xiaofeng3
1. Tongji University, Shanghai 200092, China; 2. Shanghai Hengxu Energy Saving and Environmental Protection Technology Co., Ltd.,
Shanghai 202150, China; 3. Central Research Institute of Building and Construction Co., Ltd., MCC Group, Beijing 100088, China
Abstract：The concrete shear wall with prefabricated composite shell-form system is a new kind of cast-in-situ shear wall without the necessity of demoulding. The quasistatic tests of six shell-form shear wall specimens with shear-span ratio of 1.75 and 1.0 and axial compression ratio of 0.11, 0.25 and 0.38 respectively, were carried out. The seismic behaviors, including failure patterns, hysteretic curves, skeleton curves, rigidity, energy dissipation, displacement ductility and ultimate bearing capacity, were investigated. Compared with the cast-in-situ specimens, the influences of joint connecting details and shell-form on seismic behaviors of shell-form shear wall were analyzed. The results indicated that the shell-form specimens appeared to fail in bending, and when they failed, the cracks of the shell-form appeared at both corners of the root of the specimens, while the shell-form at the lower part of the specimens with axial compression ratio of 0.38 failed in spalling. The hysteretic curves of the shell-form specimens and the cast-in-situ specimens were similar, and both were plump. Before the peak load, the rigidity of the shell-form specimen was slightly larger than that of the cast-in-situ specimen, but both were basically same when they failed. The ductility coefficients and the limit drift angles of the shell-form specimens were 2.46-4.71 and 1/50-1/38, respectively, exhibiting their good ductility performance. The ultimate bearing capacity of the shell-form specimens was similar to that of the cast-in-situ specimens, and the average value of the two was 1.04. The configuration, in which longitudinal steel bars of boundary components were lapped one by one, longitudinal steel bars distributed vertically were lapped by double-row or single-row steel bars,longitudinal steel bars distributed horizontally were lapped by double-row steel bars, could ensure the effective of force transfer of the concrete shear wall with prefabricated composite shell-form system. Finally, the mechanical performance of the concrete shear wall with prefabricated composite shell-form system was analyzed, and the relevant design suggestions were proposed.
