Nonlinear Finite Element Analysis On The Properties Of Multi-layer Wall Panel Structure

Compared with the traditional cast-in-place structure,the assembled concrete structure can shorten the construction cycle,save the construction materials,reduce the construction waste and improve the construction quality,which has been vigorously popularized and applied in the domestic construction market in recent years.This paper aims at a dry-connected multi-layer concrete wall panel structure system.Based on the finite element analysis and research,the simplified mechanical constitutive of its key joints is given.The corresponding joints’ shear performance is studied and the new joints are analyzed.The main research contents and results of the seismic performance of structural systems are as follows:(1)The shear constitutive relation of high-strength bolt joints is studied deeply,the stress mechanism of elastic,slip,strengthening and yielding is analyzed,and a simplified finite element analysis model of high-strength bolt joints is proposed.The simplified model uses the nonlinear spring element to simulate the shear performance of bolts and the truss element to simulate the tensile performance of connectors.The analysis shows that the results of the simplified model and the refined 3D solid element model are in good agreement,which verifies the validity and accuracy of the simplified model.(2)A simplified analysis model and a fine three-dimensional solid element model were used to carry out a finite element analysis of the mechanical properties of the concrete wall panel with horizontal joints.The key parameters such as the size and material strength of the two models remain the same.The analysis results of the load-displacement curve and ultimate bearing capacity of the two models agree well.The rationality and feasibility of the slab structure.Based on this,a parameter analysis is performed,and the effects of different parameters such as axial compression ratio,high-strength bolt specifications,and number of connectors on the mechanical properties of wall panels with joints are analyzed.(3)Theoretical analysis of the shearing mechanism of the joints between prefabricated wall panels is made.Based on the existing concrete technical specifications,a calculation formula for the shear bearing capacity of the joints for dry-joining concrete wall panel structures in this paper is proposed.Design method.Based on the results of finite element analysis of fine three-dimensional solids,theoretical calculation formulas for the horizontal shear capacity of wall panels are derived through theoretical analysis and calculation.(4)A macro finite element analysis model of a four-story dry-connected concrete wall panel structure was established using ETABS.In the example model,the simplified finite element model proposed in this paper is used to simulate the connection,and the layered shell element is used to simulate the concrete wall and floor.Using elastic analysis and nonlinear dynamic elastoplastic analysis methods,the overall seismic performance of dry-connected concrete wall structures is discussed.