Seismic behavior of SCFT column-H section steel beam plane frame

In this paper, SCFT column-H section steel beam plane frame is analyzed through establishing nonlinear finite element models by ANSYS. Seven sets of models were built under low cyclic loading conditions. The mechanical characteristics of these frame models were simulated. The axial compression ratio was set to be the control variable, and the influence of infilled wall on the frame was studied as well. The result shows that all the seven sets of models present symmetrical and smooth plumped hysteretic curves under low cyclic loadings, and the decending segment of the skeleton curve is slightly inclined;after mono-steel tube column reaches its yield strength in the compression section, the entire SCFT can still take more load as an integrated member, and therefore it delays the plastic deformation of the frame, showing its preferred earthquake resistant capacity;no promising evidence shows that the axial compression ratio has a strong influence on the frame's stiffness degradation, however, as the ratio increases, the ultimate bearing-capacity and displacement ductility both decrease, and the strength decreases obviously after it has reached ultimate bearing-capacity;the infilled wall bears a considerable amount of lateral load at the early stage of loading, increasing the bearing-capacity and elastic stiffness of the plane frame obviously. Considering that the rigid connection to infilled wall results in early crash of the wall, it is suggested that flexible connections or extension joints between the frame and infilled wall should be adopted in practical constructions to reduce the damage. ©, 2015, Tianjin University. All right reserved.