The Whole Stress Analysis On The Swivel Construction Of Rigid-framed Arch Bridge

Under certain conditions of construction is a kind of rapid construction technology,Construction to take into account the weight of the rotation system,Transferred out of the bridge is an opening box arch ring,construction of craft,After waiting for swivel complete closed,Reuse after closed arch ring,Erection of scaffold on arch ring,two pouring concrete,Has yet to reach the pouring of concrete strength standard,will be in the form of load on the arch ring,make the arch ring construction by large load,the most unfavorable conditions may appear in the construction process,so the complete phase ii concrete construction technology on swivel Bridges,the analysis of the construction process is particularly important.In design,general will only consider a bridge design should be carried out,and actually consider construction process into calculation results and without considering the construction process of bridge is a bridge calculation results vary,based on the rigid frame arch bridge as the engineering background of the heihe river bridge construction analysis compares the differences.Combined with the rigid frame arch bridge of a certain construction,a detailed analysis of the bridge construction and second stage concrete construction process,using large-scale finite element software Midas/FEA for simulation calculation of this bridge construction process,to analyze of the forced state of a typical construction conditions.Second bridge not consider construction process of a bridge into the force analysis,which is considering the construction process it into a bridge and does not consider the difference between a into the bridge construction process.As a bridge of through the construction process simulation analysis,and a carride out into a bridge calculation analysis results show that:1)Detailed analysis of the stress and deformation of each construction stage,especially a few important construction condition,Vertical displacement of bridge engineering of the working condition of each,normal stress,the first principal stress calculation and analysis,the third principal stress,And to calculate the working condition of each maximum displacement,maximum stress,put forward the construction scheme,for safe construction.And analyzes the working condition of each deflection of the bridge structure several control section and the upper and lower stress.2)Several control analysis of the working condition of each bridge cross section of the cumulative deflection and upper and lower stress,and analyzed the deflection of the control section and the upper and lower stress with the change trend of the construction process,through the analysis found that vault near the bridge structure under the influence of the construction process is one of the biggest,the most obvious change trend.3)Does not consider construction process of a bridge into modeling simulation analysis,the only considering the constant load,the concrete shrinkage and creep,and compressive strength,calculate the heihe river bridge is a small isolated hill reservoir into the state of the bridge,a into the displacement and stress of bridge are analyzed.4)Comparative analysis considering the construction process into a bridge and does not consider construction process of a bridge into differences of each control section displacement and stress,the results,the displacement and stress difference are within 20%.Results show that the rigid frame arch bridge construction process of a construction safe,reliable,analysis data can provide a reference for the construction of the similar Bridges.