Study On The Equivalent Model Of The Steel Frame With Recycled Concrete Infill Wall

Recycled concrete wall and frame as a whole to resist lateral loads,our research group carry out pseudo static experiment on it with three forms,infilled structure system,fabricated structure system and external structure system and analyze the impact from connection type and knot rigidity change on damage mode,load-bearing capacity,ductility and energy consumption of steel structure with recycled concrete infill wall.The effects of degradation of beam column joints of rigid and mechanical properties of recycled concrete,the equivalent model of the existing difficult to accurately simulate the wall stress performance in the frame structure,need to be modified.This paper makes recycled concrete wall equal to single lever model,three strut model and diagonal strip model based on experiment and take numerical simulation.Then propose equal analysis model for steel structure with recycled concrete infill wall by comparing the results of experiment and finite element simulation and combined with the structure system failure mode and the force mechanism,put forward the lateral structure stiffness and bearing capacity formula.The main work as follows:1.Within the steel frame infilled with ordinary concrete and steel frame infilled with recycled concrete in two specimens cyclic loading test,described its experimental phenomena and failure modes,and comparative analysis of hysteresis curve and the curve of both the bearing capacity,the results of the research indicate:comparative made of 100%substitution rate of the wall and ordinary concrete wall,the peak load of the structure,the hysteresis curve surrounded the area and shape were relatively close to each other;recycled concrete wall cracking load was reduced by 27%,yield load is reduced by about 10%,but the ultimate bearing force is similar,shows excellent recycled concrete wall panel.Recycled concrete wall combined with steel frame,the structure of the yield layer between the angular displacement between the 1/253～1/270,limit layer between angular displacement between the 1/37～1/46,that structure has good deformation ability.2.By finite element analysis,the existing equivalent model that is based on the single equivalent strut model,the equivalent of three diagonal strut model and equivalent strip model,compared to the bearing capacity curve for each equivalent model,found the bearing force curve of three diagonal strut model is closest to SPE-2’s,the error at the maximum bearing capacity of SPE-2 is only 6.5%;and compared three strut model and SPE-2 results and the deformation of the lag back curve,further validation of the three strut model suitable for the steel frame infilled with recycled concrete wall structure.3.Based on the experimental and theoretical calculation and analysis,according to the acceptance mechanism and failure mode of structural system,proposed architecture of lateral stiffness and bearing capacity formula and test data to verify the calculation formula reliability.