Experimental Research On Seismic Behavior Of New Connection Between Concrete-Filled Square Steel Tube And Steel Beam

As a type of Concrete-filled Steel Tube structure, Concrete-filled Square Steel Tube structure is widely applied in engineering, but the research on its connection is not enough.The purpose of this paper is to design a new type of connection between Concrete-filled Square Steel Tube colomn and H-type steel beam,the systematic research on it has been done through test and theory. This paper includes three parts as follow,firstly,a feasible type of connection is designed, the quasi-static test of connection between Concrete-filled Square Steel Tube colomn and steel beam with outer diaphragms is done,too. Ductility behavior, dissipation of seismic energy, degeneration of intensity and stiffness of the connection between Concrete-filled Squar Steel Tube colomn and steel beam under low-frequency, horizontal, repeat load are analysed. Hysteretic curves to this four connections specimens between displacement and repeat load, together with corresponding framework curve is shown, too. Secondly,theoretical analysis is based on nonlinear finite element method and elastic-plastic constitution relationships of steel and concrete are put forward. Computer simulation of the test with ANSYS is given. This process include seeting up the proper three-dimision model, setting the proper material parameters and effective meshing model.After this,the load-displacement curve under single load and hysteretic curves under low-frequency, horizontal, repeat load are given, together with comparision of coefficient on ductility and erengy dissipation.In the end, from the comparsion between the quasi-static test and computer simulation ,a conclusion is drawn that this type of connection between Concrete-filled Squar Steel Tube colomn and H-type steel beam has ideal sesimic behavior and available prospect.