| The semi-rigid steel frame is easy to be installed in the field.It can clearly reflect the characteristics of semi-rigid connection and has good seismic performance.Steel plate shear walls have the advantages of high strength,high initial rigidity,and good ductility,and are an efficient and widely used lateral load resistance system.The thin steel plate shear wall is a typical lateral load-resisting system.It dissipates seismic energy through the tension field formed by the steel plate,but its buckling strength is low.The corrugated steel plate shear wall is a new type of seismic and shear resistant component.Compared with the flat steel plate shear wall,the corrugated steel plate has greater out-of-plane stiffness,and it is not easy to buckling under horizontal load,thereby improving hysteretic performance.The semi-rigid steel frame has relatively low lateral stiffness and high ductility.The shear wall is used to improve its lateral performance.A new type of lightweight steel structural system(namely,the semi-rigid steel frame with corrugated steel plate shear wall)was proposed.In this study,the seismic behavior of the structure under horizontal low cyclic load was investigated through numerical simulation and theoretical analysis.To determine the section type of the shear wall,the hysteretic behavior of three types of walls with sinusoidal,triangular and trapezoidal corrugated steel plates under horizontal low cyclic load was simulated.The results show that the trapezoidal corrugated steel plate has moderate bearing capacity,low stiffness degradation and optimal energy dissipation capacity.The variation of corrugation angle has a significant impact on the energy dissipation capacity of the trapezoidal corrugated plate.The energy dissipation capacity of the structure increases first and then decreases with the increase of corrugation angle.Considering the energy dissipation capacity of the corrugated plate and the structural form of the wall,a trapezoidal corrugated steel plate with 90° corrugation angle is selected as the core unit of the shear wall.The semi-rigid steel frame is reinforced with corrugated steel plate shear wall,which can effectively improve the hysteretic behavior and energy dissipation capacity of the structure.The yield strength,initial stiffness and energy dissipation coefficient of the structure with infill panels are 1963.57%,851.28% and 73.89% higher than those of the semi-rigid frame without infill panels,respectively,but the hysteresis curve has obvious pinching phenomenon.When the corrugated steel plate shear wall is filled with foam concrete,the ultimate bearing capacity and stiffness of the structure are increased by 40.25% and 55.03% respectively,and the “pinch”phenomenon of the hysteretic curve can be effectively avoided.Increasing the strength and thickness of the corrugated panel and the stiffness of the semi-rigid joint has effectively improved the bearing capacity and stiffness of the structure,but its energy consumption capacity is decreased.By reducing the depth-width ratio of the shear wall,the failure model of the wall gradually changes from bending failure to shear failure,and the energy dissipation capacity of the structure is significantly increased,but the stiffness degradation is more obvious.Increasing the density of foam concrete has no obvious effect on the hysteretic behavior of the structure.As the height of reinforcement at the end of the shear wall increases,the hysteretic behavior of the structure is improved,and the location of the wall damage is changed.In addition,as the stiffness of the wall increases,the proportion of its shear force in the structure gradually rises.However,increasing the stiffness of the semi-rigid joints reduces the proportion of the shear force borne by the wall.Based on the principle of virtual work,the calculation method of the initial stiffness of the structure is deduced.The failure mode of the shear wall is analyzed according to the results of the numerical simulation.Based on the superposition principle,a method for calculating the ultimate shear and flexural bearing capacity of the structure is proposed,and the rationality of the model is verified. |
