Research On Anti-overturning Of Curved Concrete Box Girder Bridge Supported By Single Column Pier

In recent years,reinforced concrete box girder Bridges supported by single column piers have many overturned and collapsed accidents.In this paper,the anti-overturning stability of reinforced concrete curved box girder bridge supported by single column pier is analyzed.Firstly,according to the provisions of anti-overturning check calculation in the code,the anti-overturning check analysis of the actual bridge is carried out,and then a comprehensive consideration of the local stability of the pier,the horizontal stability of the main girder and the overall stability of the main girder is put forward.And calculate the stirrups constrained reinforced concrete compressive constitutive model,with the help of finite element software analysis of Shangyu City,Zhejiang Province,Chunhui ramp bridge overturning collapse accident,check the pier bearing capacity,it is found that the horizontal force generated by the partial load of the main beam is the main factor of the accident.With the method of numerical simulation,in order to Ganzhou city of Jiangxi province in Wuling avenue Rong jiang three road overpass bridge as the engineering background,the curve of single column pier abutment reinforced concrete box girder bridge resistive overturning stability is analyzed,through the bottom of the bridge piers of axial force and influence line girder bending bearing capacity limit curve to calculate the local stability of bridge pier,find the most unfavorable load position on the deck and the load size.The horizontal stability of main girder is analyzed by the horizontal coefficient of support reaction force.In determining the level of the local stability of the bridge pier,girder after stability,the description of the main girder integral stability index,the resistive overturning stability of the bridge as the target variable,the linear,support layout,loading location,girder pedestal and girder bottom interface properties of these variables,parametric analysis and sensitivity analysis,find sensitive factors,Suggestions on the position of support for curved bridge under the engineering background are put forward.