In this paper,ABAQUS is used to establish the finite element model of cross-shaped thin-walled concrete-filled steel tube after fire.On the basis of model verification,the synergistic mechanism of steel tube and core concrete,the distribution law of normal contact force between steel tube and core concrete,and the distribution law of longitudinal stress of core concrete are studied.It can be seen that the compression process of the short column was divided into elastic stage,elastoplastic stage,hardening stage or softening stage.The proportion of load borne by steel tube increased with heating time.The interaction between steel tube and concrete decreased with the increase of heating time,width-thickness ratio and steel bar's spacing.
关键词
火灾后/十字形截面/薄壁钢管混凝土/加劲钢筋/轴压机理
Key words
after fire/cross section/thin-walled concrete-filled steel tube/stiffened steel bars/axial compression mechanism
维普
万方数据