Improvement Technical Research On Structural Performance Of The High Fill And Large Cross Corrugated Steel Arch Bridge

Buried corrugated steel arch bridge has the characteristics of axial flexible,toroidal rigidity and good mechanical performance.They can be very good to adapt to the deformation of arch foot,such as foundation uneven settlement unfavorable situation.However,with the increasing of the filling height and the increasing of the cross-diameter,the conventional earth-wave plate arch bridge cannot meet the force requirement.Therefore,it is of great importance to put forward the improvement measures and carry out the stress performance analysis to make better use of this excellent structure.The main contents and results of this study are as follows:(1)According to the initial design of corrugated steel arch bridge in a highway,the detailed analysis about it is made by using ANSYS,and it is concluded that the corrugated steel will camber in the construction process.The initial change design cann’t meet the force requirements;In the course of construction,there is no soil arching effect;There is a corresponding relationship between soil pressure and soil deformation.(2)The improved measure of foam cement is able to meet the demand.In the construction process,the corrugated steel arch deflection phenomenon doesn’t appear.The foam cement light soil is arranged around the corrugated steel and it can absorb more external load and significantly reduce the stress and arch deflection of corrugated steel.(3)EPS flexible packing improvement measure meet the force requirements.In the process of construction,the corrugated steel will be anti-arching;EPS material caused the soil arch effect produced in advance,arch deflection and maximum equivalent stress increased with the increase of filling height has a reducing process,and in the late construction base reaction force increase slowed.(4)The maximum stress of ultra high performance concrete stiffening rib corrugated steel arch bridge is in the quarter span,and the stress is 216.36 MPa,which is less than the yield strength of steel plate.At the beginning of the earth fill,there is a reduction of vault downwarping,but there is no arch deflection phenomenon.(5)Vertical steel beam is very obvious to control the arch deflection of corrugated steel arch in the process of construction,and is only 23.14%of the initial design.It can be used as a prevention of the control of large-span corrugated steel arch bridge’s arch deflection in the process of construction.The horizontal steel beam has a certain effect of arch deflection at the end of construction process,which can be reduced by 9.92%.(6)The increase of the thickness of the foamed cement on the top of the corrugated steel plate is beneficial to the reduction of the arch deflection,and the increase of the thickness of the two sides is beneficial to the decrease of stress.EPS flexible packing thickness increases,its load shedding effect decreases gradually.The conventional form of corrugated steel arch bridge and EPS Flexible packing improvement measures corrugated steel arch bridge are influenced by Waveforms,backfill soil elastic modulus and cohesive force,and they are of litter influence to the foam cement lightweight soil corrugated steel arch bridge.