基于有限元分析的空斗墙砌体结构抗震性能研究

Study on the seismic performance of cavity wall masonry basing on the finite element analysis

通过对广大南方乡村地区存在的空斗墙砌体结构进行相关动力检测,建立了不同工况的空斗墙砌体结构有限元模型,采用模态分析法对其结构响应进行定性判断,并运用反应谱分析法对其结构抗震性能进行评估分析。结果表明,相同烈度下空斗墙所受的平均剪应力约为同尺寸实砌墙的55%;空斗墙房屋的门窗洞口、纵横墙交接、楼板和墙体搭接、突出的楼梯间等部位是其抗震薄弱部位;虽然空斗墙结构形式较为复杂,但是采用圈梁构造柱的传统构造措施仍然可以提高其抗震性能。

On the base of the dynamic detection on the cavity wall in the large rural areas of South China,the different conditions of the cavity wall finite element model for masonry structures were established.The qualitative structural response was judged by the modal response analysis,and the seismic performance was researched by the response spectrum analysis.The results show that the average shear stress suffered by the empty bucket is 55% of solid walls with the same size under the same intensity.The door and window openings,the vertical and horizontal transfer of the wall,the floor and wall overlap and the projecting stairwell are the weak parts of empty bucket against the earthquake,while the traditional structural measures,such as,beam,pillar,are useful to improve the seismic performance though the cavity wall structure is complicated.