低层双面叠合夹心保温剪力墙结构抗震设计数值模拟方法研究

Research on seismic design numerical simulation method of low-rise double-faced superimposed sandwich insulation shear wall structure

以足尺低层双面叠合夹心保温剪力墙试验楼为研究对象,基于ABAQUS研究双面叠合夹心保温剪力墙结构的数值模拟方法,并建立有限元模型,通过对比计算自振频率和实测自振频率验证数值模拟方法的可行性。另外,建立有、无外叶墙模型,分别进行模态分析和推覆分析,研究外叶墙对双面叠合夹心保温剪力墙结构动力特性、抗侧刚度和抗震承载力影响,结果表明,外叶墙和桁架筋连接件对结构动力特性影响有限,可提高结构抗震承载力;对有、无外叶墙模型分别进行弹性时程分析,结果表明,两个模型的基底剪力最大差值为9.4%,有外叶墙模型基底剪力不一定比无外叶墙模型大。综上分析,建议低层双面叠合夹心保温剪力墙结构进行抗震设计时,可简化为无外叶墙结构进行地震内力计算。

Taking the full-scale low-rise double-faced superimposed sandwich insulation shear wall test building as the research object,the numerical simulation method of double-faced superimposed sandwich insulation shear wall structure was studied based on ABAQUS,and the finite element model was established.The numerical simulation method was verified to be feasible by comparing the calculated natural frequency with the measured natural frequency.The model with and without outer prefabricated wall was established.Modal analysis and pushover calculation were carried out respectively.The influence of outer prefabricated wall on the dynamic characteristics,lateral stiffness and seismic bearing capacity of double-faced superimposed sandwich insulation shear wall structure was studied.The results show that the outer prefabricated wall and truss reinforcement connectors have limited influence on the dynamic characteristics of the structure and can improve the seismic bearing capacity of the structure.The elastic time history analysis was carried out for the model with and without outer prefabricated wall respectively.The results show that the maximum difference percentage of the base shear of the two models is 9.4%.The base shear of the model with outer prefabricated wall is not necessarily greater than that of the model without outer prefabricated wall.So,it is suggested that the low-rise double-faced superimposed sandwich insulation shear wall structure can be simplified as a structure without outer prefabricated wall for seismic internal force calculation.