Static And Stability Analysis Of Continuous Steel Truss Tied Arch Bridge

Continuous steel truss tied arch bridge has a beautiful and smooth shape,and the members in this type of bridge are mainly axial force components,which can take advantage of the steel performance.This article is based on a continuous steel truss arch bridge under construction in Anhui.The work and results are as follows:(1)According to the actual bridge,ANSYS is used to establish the finite element model of the full-bridge.The finite model is analyzed to obtain the static characteristics of the bridge under dead load,moving load,wind load and temperature load.Results show that the bridge members are mainly subjected to axial forces and the maximum stress is within the allowable range.(2)According to the static analysis results,M7 integral joint are selected for local finite element analysis.The calculation results show that the stress level in most areas of the joint is less than 150 MPa.Although there are areas of stress concentration on the joint plate,but the maximum stress does not exceed the steel yield strength.After improving the design,the phenomenon of stress concentration can be alleviated.(3)The elastic stability of the whole bridge and the suspenders which are under pressure during construction is analyzed.The effects of the vector-span ratio,moving load arrangement form and the number of wind braces on the elastic stability of the bridge are discussed.(4)Under the conditions of geometric nonlinearity and material nonlinearity,the nonlinear stability of the bridge is analyzed,and the ultimate bearing capacity of the bridge is calculated.The influence of parameters such as meshing size,initial geometric defects,vector-span ratio,moving load arrangement form and number of wind braces on the ultimate bearing capacity of the bridge is discussed.