Hysteretic Property Research On Prefabricated Structure Of Steel Frame With Energy-saving Composite Panel

In recent years, with the development of housing industrialization, steel structure has been widely used in residential buildings as a good kind of prefabricated structure. And the selection of wall assorted with the steel structure has become a key in the application of steel structure residence. Under the guidance of promoting green building policy, new energy-saving composite walls emerge as the times requires. These walls have high strength and good insulation property. They can meet people’s need for safety, comfort, environmental protection, energy saving and other functional requirements. They are ideal energy-saving building materials. A large number of domestic and foreign studies found that connected in a certain way, the wall and steel frame resist the horizontal force as a whole when the system is under horizontal earthquake. The panels not only play the role of enclosing and separating, but also involve in resisting the horizontal loads. The panels strengthen the constraint of steel frame beam and column in deformation. They form a kind of mutual restraint structure system, effectively improving the lateral bearing capacity and stiffness.The research on the seismic behavior of steel frame with energy-saving composite panels has just started. With diverse types of composite panel and different connections between steel frame and the panel, results are far from mature. This paper puts forward the prefabricated energy-saving structure "semi-rigid steel frame with composite panel structure", which combines the core idea of housing industrialization and building energy efficiency. The main structure adopts steel frame, beam-column connection adopts semi-rigid end-plate form. Composite panel adopts prefabricated concrete sandwich panel with steel truss. Connection between panel and steel frame adopts point hanging connection.In this paper, the hysteretic properties of the structure were studied through the low cyclic loading test and numerical simulation analysis using the finite element analysis software ABAQUS. Finally, combined with the results of experiment and finite element analysis, the hysteretic performance parameters and design suggestions are provided in this paper. The main work and research conclusions are as follows:(1)This paper designed6single layer, single span reduced-scale specimens. The cyclic loading tests were carried out on them. The failure modes of the structure, the hysteretic behavior, stiffness degradation, deformation and ductility and energy dissipation capacity were studied through the experiment.(2) On the basis of experiments. finite models were built and calculations were carried out using ABAQUS. Thus the finite element structure model was put forward as follows. Steel frame and panel adopt three-dimensional shell elements; Panel supporting part with steel diagonal bracing was simulated by composite layer. The end-plate connections between beam and column, the panel and the steel frame were both adopted the spring unit.(3) Experimental results show that the structure has good lateral resistant performance and seismic performance. The failure mode of "wall first and then frame" is safe for the structure seismic and the overall performance of panel is good. Panel with steel diagonal bracing can obviously improve the bearing capacity and ultimate displacement of structure and its ductility and the energy dissipation capacity is better. Ceramsite concrete panel facilitate the structural seismic performance with lightweight and strong strength. The beam-column connection between the panel and steel frame makes the seismic performance more superior. The initial stiffness of this system is2.2-2.9times of the empty frame structure. The ductility coefficient is in the range of3.23-4.54. The structure has good performance of energy dissipation. Its energy dissipation coefficient E is about0.65.(4) The finite element results show that the stress and strain nephograms and deformation of numerical simulation are consistent with the experimental results. The panel reaches its material ultimate strength earlier than the steel frame. The hysteretic curves got from numerical simulation are similar with the curves got from the experiment. The skeleton curve are also in good agreement with each other and the error is only about10%.Effects of wall thickness is smaller for the lateral stiffness of the overall structure. The relative flexible connection mode between the panel and steel frame not only increases the lateral stiffness of the structure but also ensures the wall panels’effective carrying capacity when the structure has a large horizontal displacement.