底层大空间带暗支撑剪力墙结构振动台试验研究

进行了2个1/8缩尺的底层大空间部分框支剪力墙结构模型(其中一个模型的两片落地剪力墙配有暗支撑)的振动台试验,试验结构经历了弹性阶段、开裂直至破坏全过程,研究了结构在各个阶段的动力特性变化及动力反应,比较了两个结构模型的破坏形态,进行了弹性和非线性有限元时程反应分析。试验及分析结果表明,在混凝土开裂前的弹性阶段,带暗支撑剪力墙结构的抗震性能与普通剪力墙结构基本相同;在混凝土开裂后的弹塑性阶段,带暗支撑剪力墙结构的结构抗力明显大于普通剪力墙结构的结构抗力,带暗支撑剪力墙结构模型的底层最大层间位移反应比普通剪力墙结构模型的底层最大层间位移反应显著减小,带暗支撑剪力墙与普通剪力墙的破坏形态不同,带暗支撑剪力墙底部塑性铰区的高度显著大于普通剪力墙底部塑性铰区的高度。

Earthquake simulation test of RC shear wall structure with concealed bracings and large space on ground floor

In this paper, two models of RC shear wall structures, including shear wall supported on frame, with and without concealed bracings were tested on the shaking table. The test procedures went through elastic, cracking and failure stage of structures. Dynamic characteristic and dynamic response of structures at different stages were studied, and comparison between failure patterns of 2 models was made. Elastic and nonlinear finite element time history response analyses were also carried out. The test and analysis results showed that: before concrete cracking, seismic performance of shear wall structure with concealed bracings is similar to that of shear wall structure without concealed bracings; after concrete cracking, the resistance of the former structure to earthquake is much better than the latter, and the maximum story drift response of the former is much smaller than the latter on the ground floor, the failure modes of both structures are different and the crack distribution height of shear wall with concealed bracings is higher than that of shear wall without concealed bracings.