装配整体式剪力墙模型结构振动台试验研究

为了研究装配整体式剪力墙结构的抗震性能，设计并制作了1个12层1/5装配整体式剪力墙模型结构，选用3条地震波，通过振动台试验，研究了装配整体式剪力墙模型结构的动力特性、加速度放大系数、楼层剪力和位移及最大层间位移角等动力响应，并记录了裂缝形态。试验分析表明：模型结构的自振频率在完成第一阶段水准地震波输入后下降约20%；随峰值加速度增大，模型结构自振频率减小，加速度放大系数逐渐降低，楼层剪力逐渐增大；在塑性阶段，预制墙板顶部或底部与现浇楼板连接部位出现多条水平裂缝，且沿模型高度分布较为均匀，模型结构的非线性变形明显，层间位移角显著增大，自振频率显著降低；采用层间位移角对其进行抗震性能评价，在8度抗震设防时该结构具有良好的抗震性能，但应加强预制墙板与楼板的连接，增强其整体性，避免楼层通缝的出现。

Shaking table test on monolithic precast concrete shear wall model structure

In order to study the seismic behavior of monolithic precast concrete shear wall structure, a 12-story 1/5 scale monolithic precast concrete shear wall model structure was designed and constructed. The dynamic characteristics, acceleration magnification factor, floor shear and displacement, and the maximum inter-story drift were examined through a shaking table test considering three seismic waves. The cracking phenomenon was also studied in detail. The experimental study shows that after the first loading stage the natural frequency is reduced to 80% of the original frequency. With increase in PGA, the natural frequency and the acceleration magnification factor are reduced, and the floor shear is increased. In the inelastic performance stage, evenly distributed horizontal cracks are observed of the junctions between the prefabricated wall and the floor. In addition, the model structure shows evidently nonlinear behavior, where the inter-story drift ratios increase and the natural frequency decreases significantly. By examining the peak inter-story drift ratios response, it is concluded that the monolithic precast concrete shear wall structure could be used against seismic intensity 8. However, the connection performance of the prefabricated wall and the floor should be strengthened to avoid through cracks.