Mechanical Performance Analysis Of The Composite Structure With Steel Frame With Expanded Flange At Beam End And Shear Wall By Poplar LVL

Considering that the steel wood composite structure(STC)can better utilize the advantages of both steel and wood materials,this paper proposes a beam end expansion wing shaped high-strength steel frame Poplar LVL wood shear wall composite structure.This composite structure not only utilizes high-strength steel with superior seismic performance to form a steel frame structure system,but also allows for a warm and comfortable appearance to feel glued wood to form a wall structure.For this new type of composite structure,it is necessary to combine nonlinear theory and finite element method to study the modeling method of the nonlinear finite element model of the beam end expanded wing steel frame Poplar LVL shear wall composite structure,including the influence of the beam end expanded wing structure on the position of the plastic hinge at the beam end,the collaborative work performance between steel and wood,wall simplification in the finite element analysis model of mid to high rise structures,and the overall seismic performance of the composite structure.Through experimental research Conduct research using research methods such as numerical simulation and theoretical analysis.The main content and conclusions are as follows:(1)Research on Mechanical Properties of High Strength Steel Welded Joint Plate(Q690D-ER76)node:Firstly,material properties tests were conducted on high-strength steel and glued wood.Secondly,six sets of ER76 welding wire welded joint plate specimens with different thicknesses on both sides of the plates were designed for the mechanical properties of high-strength steel welded joint plate welds.Unidirectional tensile tests and tensile compression cyclic tests were conducted.Establish a finite element model of Q690D-ER76 welded joint plate.By comparing the experimental results with the finite element simulation results,the accuracy of finite element analysis parameters and the effectiveness of finite element nonlinear analysis are verified.The research results provide support for the finite element simulation of the subsequent beam end expansion wing steel Poplar LVL composite structure.(2)Research on the mechanical properties of steel wood high-strength bolt connection joints:Three sets of high-strength bolt connection specimens with different diameters(M12,M1 6,M20)were subjected to uniaxial tensile testing and finite element simulation.After calculation,it was found that the error between the experimental results and the numerical simulation was within ± 5%.By comparing the mechanical test data of high-strength bolt nodes with different diameters through experiments and simulations,it was found that the larger the bolt diameter,the smaller the average yield load and ultimate load at the node.(3)Analysis of the influence of glued wood shear wall structure on the mechanical performance of the beam end expanded wing steel frame Poplar LVL wood shear wall composite structure:By comparing the finite element analysis results of the single-layer single span beam end expanded wing steel frame Poplar LVL wood shear wall composite structure with pure steel frame under low circumferential displacement,the steel wood mixed frame can better play to the overall plasticity of the structure and have higher seismic performance compared to pure steel frame.Based on the above research results,a restoring force model is established to conduct elastic-plastic analysis of the Poplar LVL structure,a high-strength steel frame with a single span beam end expansion wing.(4)Analyze the impact of beam end expansion on the seismic performance of the double layer double span beam end expansion wing steel frame Poplar LVL shear wall composite structure,establish a finite element analysis model of the double layer double span beam end expansion wing high strength steel frame Poplar LVL shear wall composite structure and the double layer double span ordinary high strength steel frame Poplar LVL shear wall composite structure,and study the hysteresis performance of the beam end expansion wing type composite frame structure under low cyclic displacement loading,Analyzing the influence of beam end expansion on the mechanical performance of composite frames,the research results show that the force distribution of beam end expansion wing composite frames is more reasonable and has good seismic performance.Based on the above research results,a restoring force model is established to conduct elastic-plastic analysis of the Poplar LVL structure,a high-strength steel frame with double span beam end expansion wings.