Power Plant No.2 Bridge Design Calculation And Monitoring

With the continuous development of society,the constant improvement of the civil engineering economy,technology,make to the long-span bridge structure,the development direction of new forms of.Which because of convenient construction,long span continuous rigid frame bridge expansion joint,driving comfort,have good seismic performance,and there is a big bridge to the bending stiffness and lateral torsional rigidity,can satisfy the requirement of the stress of the large span Bridges,etc are widely used.Continuous rigid frame bridge is more than the cantilever construction method is adopted in the construction.But there exist some problems in the continuous rigid frame bridge at the same time,is one of the main girder across middle scratched and box girder cracking problems.With increasing span length of continuous rigid frame bridge,the main girder across the middle and lower torsion problem also more and more get people’s attention.Cause of the main reasons for this problem is when the design on the influence of concrete creep and long-term estimate shortage,the second is effective prestress on the influence of concrete creep.Box girder crack mainly because of box section of torsion,warping,distortion in web shear stress increased,thereby increasing the principal tensile stress and cause the cracking of the inclined web.The continuous development of the bridge,also makes the durability of the bridge,we use load higher requirements are put forward.Is to ensure that in the construction of long span continuous rigid frame bridge monitoring using the security of the important measures in the process of operation.This paper on the structure characteristics of long span continuous rigid frame,the existing problems and development situation at home and abroad briefly,then based on the nanchuan district power plant no.2 bridge in chongqing as the backing,from the technical standards,bridge site area natural condition,hydrogeological condition and so on has carried on the bridge to the bridge design,and using the finite element software Midas Civil established the calculation model and calculation on to this bridge structure stress and deformation.Finally combining with the calculation results,the thermal power plant no.2 bridge construction monitoring analysis,to ensure the construction quality and safety,and security stress,linear to meet the requirements.