【摘要】 某拟建文化艺术中心是一个具有大空间、大悬挑等特点的混凝土框架-剪力墙结构,结构一端为多层大悬挑结构,最大悬挑长度为22 m,并且在顶层中庭有30 m的大跨度区域,属平面和立面均不规则的结构。采用NOSACAD和ABAQUS有限元程序建立整体结构分析模型,进行7度罕遇烈度下的弹塑性时程分析,研究了该结构在大震作用下的变形情况、塑性铰的分布以及受力机理等。计算结果表明:结构的悬挑端在竖向地震作用下的动力响应显著,剪力墙受拉损伤在结构底部和悬挑楼层处较为明显;但在大震下层间位移角满足规范要求;并对结构裙房截断后的模型进行了1/30的大缩尺模拟地震振动台试验,验证了截断模型方法在本试验中的合理性,最后根据构件的受力或损坏情况给出了设计改进建议。更多还原

【Abstract】 A culture and art center discussed here was a RC frame-wall structure characterized with a large cantilevered length and a large space,the maximum cantilevered length was 22 m and the maximum span of the large space was 30 m. It was irregular both in plan and elevation. Using Nosacad and Abaqus,the structural analysis model was established in order to simulate the nonlinear behavior and study deformations,distribution of plastic hinges,and forcebearing mechanism of the structure under the rare earthquake of magnitude of 7. The analysis results showed that the cantilevered end of the structure is sensitive to vertical earthquake; tension damage mainly occurs at the bottom of the shear wall and the cantilevered stories; the maximum inter-story drifts are less than the seismic design requirement of Chinese code. A 1 /30 scale model was tested on a shaking table to study the seismic behavior of this kind structure after cutting the podium of the structure,the comparison between the results before and after cutting was conducted to verify the reasonability of this design method. The test results agreed well with those of the finite element analysis. Finally,according to the response and damage results of the structure,suggestions for structure design improvment were given.更多还原