填充墙对预制混凝土(PC)框架的抗连续倒塌性能有显著影响,而现阶段缺乏对应的设计方法.为了得到可靠的抗连续倒塌计算方法,针对带填充墙PC框架的抗连续倒塌特性进行数值与解析分析.根据去除中柱后的无填充墙PC框架和带填充墙PC框架3∶1缩尺试验,考虑填充墙不对称分布下的中柱偏移,引入不对称系数,建立基于填充墙等效压杆的力学模型.利用有限元法,建立填充墙不对称分布情况下的子框架数值模型,分析得到中柱位移-荷载曲线.在此基础上,将解析解与无填充墙、双填充墙PC框架结构试验以及单填充墙PC框架结构数值结果进行对比验证,结果吻合良好.通过与现有规范中的设计方法对比发现:在考虑填充墙情况下,PC框架在悬链线峰值荷载时的位移增大,现有规范中建议的中柱位移为跨度的0.2倍适用于无填充墙预制框架,对于带填充墙的预制框架则偏于保守.研究结果为填充墙PC框架抗连续倒塌计算提供依据.

The infill wall has a significant influence on the progressive collapse resistance of the precast concrete (PC) frame, and there is no corresponding design method at present. In order to obtain a reliable calculation method for progressive collapse, a numerical and analytical analysis of progressive collapse resistance of PC frames with infill walls was conducted. According to the 3∶1 scale test of PC frames with and without infill walls after removing middle column, and considering the displacement of middle column under the asymmetric distribution of infill walls, a mechanical model based on equivalent strut was established by introducing asymmetry coefficient. Based on the finite element (FE), numerical models of the sub frames with the asymmetric infill walls were established, and displacement-load curves of the middle column were obtained, based on which, the analytical solutions were compared with the test results of bare, double, and single infill wall PC frames, and the results were found in good agreement. A comparison of the calculation results with the recommended values in current codes indicates that the displacement of PC frames under the peak load of catenary is increased when considering the infill wall. The recommended value of the displacement, whose middle column is 0.2 times of the span, is suitable for the bare PC frames, but conservative for the PC frames with infill walls. The results provide a basis for the calculation of the progressive collapse resistance of PC frames with infill walls.