Study On Seismic Behavior Of Column Composed Of Concrete-filled Steel Tubes Frame Shear Wall Structure With Different Height

In this paper,the seismic performances of concrete filled steel tube composite column frame-shear wall structures at different heights were analyzed,by changing variables such as the size of structures or cross section forms to compare the influences of different height changes on the seismic performances of structures.Structure models was established by using SAP2000 finite element analysis software at the height of 60 m,81m and 99 m for the concrete filled steel tube composite column frame-shear wall structures.For the 60m-model,six groups of variable model has been set up by changing the periphery of concrete filled steel tube composite column section form,frame beam,concrete shear wall connection form and slab thickness;For the 81m-model,the cross-section form of the periphery concrete filled steel tube composite column structure,Y to the steel beam height,and the layout of eccentrically braced position were changed to set up six models;For 99m-height,the cross-section form of the periphery concrete filled steel tube composite column structure,Y to the steel beam height,column section form and shear wall thickness varied to establish a model of five groups of variables.First,the analyzed results of three different height models show that increasing the thickness of the floor,frame beam and concrete shear wall with hinged connection and change the thickness of the shear wall had the biggest influence on dynamic response of structure;increasing the thickness of the floor and adopting the hinged connection structure cycle increased the cycle of the whole structure;increasing the thickness of the shear wall made the stiffness of the whole structure bigger and enhanced its ability to resist torsion.By modal analysis to understand the dynamic response of structure,and then analyzed the structure of the model for vibration mode decomposition response spectrum and elastic time history.The response spectrum and time history analysis results showed that although response spectrum and time history analysis resulted on numerical differences,but the overall trend was basically the same.Through all the variables,the heights of steel beam and thickness of the shear wall had the most effective control on the angle of interlayer displacement.The section form of concrete filled steel tube composite column can make the displacement angle reduced between different layers,but the effect was not obvious.