| Light wood structure is a light building structure composed of specification wood and wood-based structural board or gypsum board,which has the advantages of convenient construction and good seismic performance.The shear wall of light wood structure is the most important anti-lateral component in light wood structure buildings.Its anti-lateral performance mainly depends on the performance of panel materials and nail connection joints.Due to the differences in mechanical properties of nails at home and abroad,it also has a great influence on the bearing capacity of shear walls.The co-deformation force of wood frame and composite panel is the main form of light wood structure shear wall in resisting horizontal lateral force.As wood frame and composite panel are two kinds of materials with different properties,they have different stress modes and deformation characteristics,and the nail connector of shear wall is crucial to its mechanical performance.Therefore,this paper focuses on the single mechanical performance of each component of light wood structure shear wall,and the contribution of each component combination to the deformation performance of the shear wall and the lateral resistance of the shear wall.The specific research is as follows:Material properties are important parameters in theoretical analysis or finite element simulation.This paper introduces the water absorption,shear and three-point bending test of paper phosphogypsum board.The test shows that the shear strength of phosphogypsum composite panel meets the specification requirements,and the corresponding elastic modulus is obtained.Nail connection is the main connection mode of shear wall.According to the failure mode of shear wall,the bending resistance,shear resistance and uplift resistance of skeleton nail connection joints are experimentally studied,which provides data reference for the finite element simulation of theoretical analysis.In this paper,six groups of tests were carried out to analyze the shear wall of light wood structure.Taking the panel nail spacing,the number of anchors and the single and double deck as variables,the lateral stiffness,ductility,peak load,ultimate displacement,yield displacement of the shear wall and the connection slip relationship between the panel and the wood frame are analyzed.Failure of connection between wood frame and composite panel will cause shear wall failure.The lateral resistance of wood skeleton was deduced by the mechanical properties of the skeleton nail connection node and the deformation of wood skeleton specification material.Based on the mechanical properties of the panel nail connection node,the calculation formula of the shear wall bearing capacity with the failure of the panel nail connection was derived,that is,the contribution of the composite panel to the shear wall bearing capacity.The shear wall test results were compared and analyzed by combining the lateral resistance of the wood skeleton and the composite panel,and the theoretical value was consistent with the experimental value.Finally,ABAQUS finite element software is used to establish the panel nail connection node,skeleton nail connection node and light wood structure shear wall model.The simulation results are consistent with the experimental results. |
