Hysteretic Behavior Of Assembled Steel Frame With Reinforced Concrete Infill Wall

The Assembled steel frame-reinforced concrete infill wall(ASRCW)is a new type of composite structural system.The traditional steel frame-reinforced concrete infill wall(SRCW)has the mechanical properties of large lateral stiffness,high bearing capacity,and multi-lateral resistance system under horizontal seismic loading[1-8]In China,there have been many studies on the SRCW system in recent years,and there are also certain depth researches on the transmission path and the destruction mechanism[9-12].In the last two years,China has strongly advocated the design and construction of prefabricated buildings.Currently,most of the products on the market are in the form of PC-assembled structures.However,in the steel structures,the wall-plate-type anti-side systems are rarely assembled or constructed.Therefore,in this paper,the Assembled steel frame infill precast concrete wall structure system(ASRCW).and study its mechanical properties,this paper uses a combination of experimental research,finite element simulation and mathematical model calculation of the ASRCW systematic research,mainly carried out the following work:Two pieces of single-span single-span 1/2 scale specimens were designed and fabricated with the same configuration and different axial compression ratios.They were subjected to low-cycle reciprocating loading tests.The ASRCW system,wallboards and frames have been experimentally studied for the force transfer mechanism,failure mode,hysteretic behavior,stiffness degradation,deformation and ductility,energy dissipation capacity,and distribution of shear moments.The ASRCW system was judged based on the experimental phenomena and results.Under the horizontal load,two lines of defense are present(ie,the wall panel breaks down first and then works,and the frame becomes the second line of defense);real-time strain analysis is performed on the surrounding shear connectors,and the wall panel under horizontal load is obtained.The law of interaction between frames.In the ABAQUS finite element software,the two specimens were subjected to low-cycle reciprocating load simulations,and the phenomena and data were compared with the tests.It was found that the test was close to the finite element simulation phenomenon.and the ultimate bearing capacity had certain accuracy,the error is 5.5%.The comparison of mathematical model,finite element model and experimental measurement data of the simplified model of the side truss against the wall truss was carried out.The width of the truss model and its real-time changes were analyzed and compared.According to the truss force characteristics and tension and compression The hypothesis of unit yielding at the same time puts forward the relevant parameters suitable for calculating the ultimate bearing capacity of the system.After comparison,the mathematical model and the experimental results show that the ultimate bearing capacity has a good agreement,and the maximum error is 2.2%.The theoretically calculated equivalent truss width is substituted into the SAP model to establish a frame model,and then a nonlinear model is used to build a concrete model.The stiffness of the two stages is compared and the results show that the stiffness values are close to each other.The error is 5.8%.Finally,according to the test results and finite element analysis,the relevant proposals for engineering design are proposed,which makes the engineering design results more reliable.