Analyses On Static And Dynamic Performance And Ultimate Bearing Capacity For Highway Steel Truss Arch Bridge

First of all,the development of steel truss arch bridges at home and abroad was introduced,and the structural forms and characteristics of long-span steel truss arch bridges were summarized.The design and construction scheme of(108+288+108)m three-span continuous steel truss arch bridge was briefly introduced.The whole bridge spatial finite element model was established by finite element software MIDAS/CIVIL,and the simulation of steel truss,suspender,bridge deck,foundation and boundary conditions were introduced in detail,the construction stages of analysis were divided.The displacement,stress and stability of the bridge during construction were analyzed.The stress and deformation of the bridge under the action of dead load,vehicle load,temperature action and wind load were calculated and analyzed.The multi-vector Ritz method was used to calculate the static mode of the bridge.The seismic response of the bridge was analyzed by the response spectrum method and the time history analysis method.General finite element software Algor was used to establish a whole bridge intergrated element model based on beam element,solid element and plate element.The bridge floor system was simulated by plate element in detail,the stress and deformation of the bridge floor system under different wheel loading were analyzed.At last,the ideal elastoplastic steel model was used to establish a layer-by-layer yield model of the layered beam element.Considering the growth of constant load and live load and the growth of only live load,the ultimate bearing capacity of the bridge was analyzed.