Based on the current situation where some existing building structures cannot meet the usage requirements,the purpose of prolonging the structural natural vibration period and controlling the damage is realized by integrating the mass adjustment and deformation mode control.The method is to propose a story-adding frame-rocking wall system,analyze the structure theoretically,and study the influence mechanism of story-adding on the seismic effect of the overall structure.Five finite element models are established by using SAP2000 platform.Based on the standard response spectrum,the parameter sensitivity analysis,static and dynamic elastoplasticity analysis are carried out.On this basis,a simplified mechanical model of rocking wall is constructed.The results show that the quality and height of the added layer have a significant effect on the seismic action of the whole structure.Compared with the original frame,the maximum natural vibration period of the structure is extended by 31.7％,the maximum elastic-plastic ultimate displacement response is reduced by 11.5％,the maximum displacement angle response is reduced by 20.2％,and the structural inhomogeneity is reduced by 22.0％.Compared with the frame-rocking wall,the bending moment of the rocking wall is reduced by 33.9％in the elastic-plastic limit state.It is concluded that the reasonable addition of additional story-rocking wall can slightly reduce the overall seismic action of the structure,reduce the seismic response of the structure,and effectively control the structural deformation mode.The simplified mechanical model of rocking wall can reasonably reflect the bending moment distribution of wall under earthquake and make the design safer.
关键词
增层框架/框架-摇摆墙/抗震性能/动力学模型/有限元分析
Key words
seismic performance/adding story frame/frame-rocking wall/dynamic model/finite element analysis
维普
万方数据