All-welded Joint Aluminum Alloy Single Spherical Study Of The Dynamic Performance Of The Mesh Shell

In China,the Mesh shell structure,as one of the space structure forms,is more widely used,and its materials are mainly composed of wood,steel,and aluminum alloy.Since people invented welding technology in the 1880 s,with the increasing maturity of steel welding technology,a large number of all-welded steel mesh and shell structures have appeared.In contrast,aluminium alloy mesh and shell structures are rarely welded,and mechanical connections such as plate node connections are mainly used between their components.At present,scholars at home and abroad mainly focus on the impact of node welding on aluminium alloy rods,but most studies do not consider the impact of welded nodes on the overall performance of aluminium alloy mesh and shell structures.The purpose of this paper is to investigate the dynamic characteristics of an aluminum alloy single-layer spherical mesh shell under all-welded nodes and its response under seismic action through shaking table test research and to observe the damage condition of its nodes and rods to obtain more accurate results.All-welded connection of aluminum alloy single spherical mesh shell shaking table test is rare in China,but it can provide a reference for the development of aluminum alloy node welding.Based on the experimental validation,a further multi-parameter study of the all-welded aluminium alloy mesh shell was carried out using finite element numerical simulation techniques.(1)Introduction of the stiffness equivalence principle and Quantitative analysis method.Based on the lecture hall in the military-civil integration innovation park A of Xi’an space base,this study adopts the similarity relationship is applied to establish a single-layer spherical mesh shell test model of aluminum alloy with a scaling ratio of 1:25,determines the structural scale of the model by the length scale,determines the load state by the dynamic scale,and determines the basic parameters of the finite element simulation by the materiality test.(2)Shake table test of the mesh shell scaled model is carried out.The dynamic response data of the mesh shell scaled model under the action of the earthquake were recorded,the data were compiled and the corresponding comparison curves were drawn to analyze the dynamic characteristics of the model under different working conditions.(3)Finite element modal analysis and dynamic time course analysis were performed.The numerical simulation results are compared with each other with the experimental data results,and it is found that the finite element modeling can accurately simulate the real vibration response,which proves the reliability and accuracy of the finite element simulation analysis.(4)Establishing mesh shell models with different vector-to-span ratios and nodal constraints.Expand the study of aluminum alloy single-layer spherical mesh shell in different conditions of all-welded dynamic performance.