底部框架上部砌体结构的非线性有限元分析模型及其应用

Nonlinear finite element analysis model of hybrid masonry-concrete structures and its application

为详细分析底部框架上部砌体结构的地震破坏机理和抗震性能,除了采用试验的手段进行分析,还需要建立有效的非线性地震分析反应模型,总结了现有的底框结构的有限元模型,并分别说明了其各自的优缺点;在此基础上,通过有限元分析软件ABAQUS实体单元建立了该结构的非线性分析模型;利用该模型对一栋底框结构进行7度设防下的小震、中震、大震、超大震作用下结构的反应分析,详细分析了各层的层间位移角,以及裂缝开展位置的变化情况。结果表明,该结构满足小震不坏,中震可修,大震不倒的抗震设防要求;模型所得到的结构的薄弱层为3层砌体层,与按《建筑抗震设计规范》(GB50011—2001)设计的实际底框结构的震害现象相吻合,验证了该分析模型的有效性和适用性。

In order to study the earthquake damage mechanism and seismic behavior of hybrid masonry-concrete structures,it necessary to establish an effective nonlinear seismic response analysis reaction model,in addition to the analysis of the experiment.The existing finite element model of hybrid masonry-concrete structures are summarized,and their advantages and disadvantages are illustrated respectively.On this basis by the finite element analysis software ABAQUS,the nonlinear analysis model the structure is established.Using this model,the response of a hybrid masonryconcrete structure under the condition of 7 degree seismic fortification is analyzed under the minor earthquakes,moderate earthquakes,major earthquake and great major earthquak.The inter-story displacement angle and the changes of crack position are analyzed.It is showed that the seismic fortification requirements of the structure is satisfied,which is no damage in minor earthquakes,mendable in moderate earthquakes,no collapsing in major earthquake.The weak story of structure is the third floors,which is similar with the earthquake damage of the real hybrid masonry-concrete structures designed by Code for seismic design of buildings(GB50011—2001).Which the validity and applicability of the analysis model are verified.