Research On Mechanical Properties Of Grid-shaped Steel Wall With Non-four-side Connections

The steel plate shear wall structure has high bearing capacity,initial stiffness,good ductility and energy dissipation capacity,and is widely used as lateral force resisting component.The grid-shaped steel wall proposed based on the simplified model of steel plate shear wall is a new type of steel plate shear wall,which can effectively improve the mechanical properties of steel plate shear wall and show rapid production and installation of steel structure.This paper presents a grid-shaped steel wall with non-four-side connections to avoid the effect on the column and arrange doors and windows conveniently.Test and finite element analysis were carried out to study the stress mechanisms and mechanical properties of the new structure under lateral force.The method for calculating bearing capacity was proposed.The design according to engineering was carried out.The main contents of the paper include:(1)The quasi-static tests on four specimens were conducted to investigate the bearing capacity,stiffness,energy dissipation capacity,ductility and other mechanical properties of the specimens with different steel grid arrangements and different connection methods with the frame columns.The stress mechanism and failure modes of the specimens under low cyclic loads were analysed.The structure has good seismic performance and has a reasonable failure mode.The experimental research provides a basis for the finite element and theoretical analysis.(2)The finite element analysis software ABAQUS was used to establish a refined finite element model,and the results of the load displacement curve,bearing capacity and member deformation obtained from the finite element analysis were compared with the test results to verify the accuracy of the analytical model.On this basis,the stress mechanism of the structure under monotonic loads were analysed.The parameters such as the opening space,boundary elements size and section steel size were changed for analysis.The influence of each parameter on the load-carrying capacity and initial stiffness of the structure was obtained.(3)The results of the test and finite element analysis were compared to summarise the stress mechanism of the grid-shaped steel wall with non-four-side connections under the monotonic load.A simplified calculation assumption of yield bearing capacity was proposed.The calculation formula for the load-carrying capacity was given by considering the effect of tensile field of grid-shaped steel wall and the contribution of lateral stiffness of boundary elements.The accuracy of the proposed laod-carrying capacity calculation method was verified by comparing the theoretical calculation results with the finite element calculation results.(4)The grid-shaped steel wall structure was applied to high-rise steel residential buildings and the trial design was carried out.The first-order elastic analysis and second-order elastic direct analysis were used to explore the analysis and design methods applicable to grid-shaped steel wall structure through MIDAS software.The overall structural modelling method,initial defect imposing method,load combination and non-linear analysis of the grid-shaped steel wall as a lateral force resisting member were studied to provide a reference for the engineering application of grid-shaped steel wall structure.