Experimental Analysis And Theoretical Studies Of Double Web-angle Connection Steel Frame-Unstiffened Thin Steel Plate Sheer Wall

Semi Rigid Connection Steel Frame-Unstiffened Thin Steel Plate Sheer Wall (SRSW) is considered as a new type of aseismatic structure showing merits such as multi-defence system of earthquake-resistant, fast construction, substantial ductility and high-efficiency utilization of materials, which combines advantages of semi rigid connection steel frame and steel plate sheer wall. Since the research of SRSW is still in the initial stage, this paper has carried out the test which was taken by using a one-third scale, one-bay, two-story experimental specimen of semi rigid double web-angle connection steel frame with steel plate shear walls loading the low-cyclic reversed to determine general behavior and local response, in order to study seismic behavior and force distribution in the SRSW structural system of different coupling initial rotational stiffness of simi-rigid connection steel frame, showing great theoretical and realistic significants.For using traditional design program, the paper discussed the influence factors and applicability of various equivalent analysis method of unstiffened thin steel plate sheer wall. Based on the above research, the paper applies a simplified analysis method of new system. Therefore, the non-linear finite element analysis model was built by equivalent mode, and then the finite-element analysis model was validated by the results of experiments. The actual properties of semi-rigid connections was simulated by the rigid panel method, which also exploring the behavior and internal force distribution mechanism. The finite element calculation results are more consistent with the test results. Finally, The influences of different coupling initial rotational stiffness of simi-rigid connection steel frame, different infill wall slenderness ratios and column flexibility on the structural horizontal ultimate bearing capacity and bearing load proportion of SRSW were investigated and evaluated by using the ANSYS software.In conclusion, the results shows that the steel plane shear wall could improve the lateral bearing capacity, lateral stiffness and high safety factor of the simi-rigid composite steel frame; the structure has favorable lateral initial stiffness, but the stiffness degradation reaches 78%; the damage mode expresses local tearing of the infill plate, the tension-field action obviously, forming plastic hinges at the bottom of column and PR connection, flexural at the in-plane of the specimen. The mode has desirable ductility and energy dissipation capacity. The simi-rigid composite steel framework undertakes 80%～90% of the whole overturning moment and the infill wall takes 55%～85% of overall lateral load.In the end, the research on hysteretie behavior of SRSW struetural system under cyclic loading is relatively comprehensive and systematic, which might be useful for revising design code, guiding building design and forming foundation for further seismic behavior study of SRSW.