Research On Performance Of Space Steel Frame Brace System Based On Multi-scale Method

The steel frame brace system is an important structural form of the steel structure building and a structural form with good lateral resistance.For the steel frame brace system,the layout of the brace has an important impact on the overall lateral stiffness of the structure.At the same time,the steel frame beam-column joint is the focus of structural design,and it is customary in the project to simplify the beam-column joint to be rigid or hinged.In fact,the stiffness of the beam-column joint is between rigid and articulated,and is semi-rigid.Different types of joints have different connection stiffness,and their impact on the overall performance of the structure is also different.At present,domestic and foreign scholars have carried out some studies on the influence of the brace layout on the lateral rigidity of the steel frame,but most studies have not considered the spatial effect of the steel frame and the semi-rigidity of the beam-column joints.Brace system for in-depth research.This paper mainly analyzes the effect of the brace arrangement and the rotation stiffness of the beam-column connection on the performance of the space steel frame structure.A multi-scale finite element technique was used to establish a finite element model to explore the influence of the steel-frame brace system on the overall structural performance of its axial brace structure and beam-column joint types when subjected to space loads.main tasks as follows:(1)Introduce the connection principle and method of multi-scale finite element technology,and use the finite element analysis software ANSYS to establish its solid element model and multi-scale model,and verify the effectiveness of the multi-scale modeling method by comparing the calculation results of the two models.(2)Three different methods of pure beam element,pure solid element and multi-scale technology are used to establish the finite element model of the space steel frame brace system.By comparing and analyzing the calculation results of the three finite element models,it is known that the multi-scale frame model can effectively simulate the stress performance of the frame nodes and the semi-rigidity of the nodes.The calculation time is less than the pure solid element model,which can significantly improve the calculation efficiency.(3)Briefly introduce the experimental research of the space steel frame brace system made by the research group,establish the finite element model of the test steel frame brace system using the multi-scale finite element method,and compare and analyze the calculation results of the finite element model with the test results prove Scale model modeling method is feasible.(4)The multi-scale method is used to establish the finite element model of the three-story space steel frame brace system.The comparative analysis discusses the influence of the space steel frame brace system on the performance of the space steel frame under the spatial load.(5)Multi-scale technology is used to establish the finite element model of the space steel frame brace system with four weak axis beam-column connections,and the model is loaded separately to explore the strong and weak axis coupling effect and the beam-column connection of the space steel frame brace system.The effect of type on the overall performance of the space frame brace system.