阶梯墙框架结构振动台对比试验研究

Shaking table comparison tests of stepped wall-frame structures

针对汶川和玉树地震中RC框架结构广泛出现的底层薄弱现象,提出一种新的结构体系———阶梯墙框架结构体系。为研究该类结构的抗震性能,进行了一个1∶5的普通RC框架结构模型和一个1∶5的阶梯墙框架结构模型的振动台对比试验,得到结构在小震、中震、大震直至倒塌工况下的动力特性、动力反应和宏观破坏模式。试验现象和进一步分析表明,阶梯墙体系能够有效控制结构的变形和损伤模式,实现结构各层变形的平均化,抑制底层薄弱的层屈服机制的出现,并且经济实用,构造简单,适合大规模推广应用。

Wenchuan and Yushu earthquakes highlighted that the bottom yielding mode of RC frame created serious consequences. A new structure system named stepped wall-flame structure is proposed to solve this problem. Shaking table tests of a 1 ： 5 scaled ordinary RC frame model and a 1 ： 5 scaled stepped wall-frame model were conducted to study the seismic behavior of the new structure system. The dynamic characteristics, seismic responses and failure mechanism of the two models under a series of excitations with gradually increasing acceleration amplitudes are presented. The test results demonstrate that the proposed stepped wall-frame structures can effectively control the structural deformation and damage distribution, suppress emergence of the bottom yielding mechanism, and is easy to be applied due to its simple structure and good economic benefits.