Study On Structure Mechanical Properties Influenced By Corrugated Steel Webs’ Incline By Box Girder Bridge With Corrugated Steel Webs

In recent years,corrugated steel webs PC composite box girder,which is a box girder bridge with corrugated steel web instead of traditional prestressed concrete box girder,is catching peoples’ eyes as a new kind of bridge structure,It has a good development prospects for the lighter deadweight,clearly force-bearing and strong seismic resistance.However,due to the few applications of such bridges,a further study of theoretical researches about that is asked.In order to study the effect of the rotation or inclination of the corrugated steel web on the mechanical properties of the steel web,the paper uses the Midas Civil program software to analyze the influence of the rotation of the corrugated steel web on the mechanical properties of the steel web making the background bridge as an example,the finite element model of vertical and inclined 4° of corrugated steel webs was established.Because Midas/Civil is established when the corrugated steel web box girder bridge is established,it can only be modeled by the whole modeling method,and the simulation of the tilt state of the web can not be realized.In this paper,The simulation results show that the stability of the web and the ultimate bearing capacity of the model are analyzed when the web is rotated.The main workout is as follows:First,the development process of PC composite box girder with corrugated steel web is reviewed,and the theoretical knowledge and calculation formula of corrugated steel web stability and ultimate bearing capacity are summarized.Second,the anti-overturning stability test of the bridge is obtained by the theoretical formula,and the anti-overturning stability coefficient is obtained.The stability of the model is analyzed by Midas/Civil program software.The stability of the model is analyzed under different load conditions of the maximum cantilever stage and the bridge stage.Modal and first order stability coefficients.The results show that the first-order stability coefficient of the maximum bridge cantilever is reduced by about 5.5%after the web is tilted,and the first-order stability coefficient is reduced by about 5%.Third,the buckling safety of the corrugated steel webs is evaluated before and after the slanting of the corrugated steel webs,and the results of the buckling,local buckling and synthetic buckling of the corrugated steel web are obtained.The results show that the background bridge after the tilt,the local buckling,the total buckling and the value of the synthetic buckling of the structure decrease,and the variation range is 0.49%.Fourth,the ultimate bearing capacity of the corrugated steel webs of the background bridge is analyzed,and the ultimate bearing capacity of the bridge is analyzed,and the normal section of the bridge is obtained.The results show that the ultimate bearing capacity of the bridge has no obvious change after the web is tilted,and the bearing capacity of the bridge carrying capacity limit is about 1.5% lower than that of the normal bridge.The limit state is almost unchanged.