Analysis of Influencing Factors on Pre-camber of Long-span Continuous Beam Bridge under Cantilever Construction
In order to systematically analyze the influence of the deformation of the hanging basket system on the pre-camber of the construction of the high-speed railway long-span continuous beam bridge,taking the deformation of the hanging basket system of the long-span continuous beam bridge as the single influencing factor,the influence factors of pre-camber were analyzed numerically.By the means of theoretical analysis and finite element model,the construction process of the hanging basket system was analyzed to ensure that the elastic and inelastic deformation of the hanging basket system caused by construction load and dead weight are within the design scope.And the method was applied in the project of Lijiahe prestressed concrete continuous beam-arch bridge of Xuyan high-speed railway.The engineering practice shows that the inelastic deformation at the maximum cantilever can be effectively eliminated and the influence of the pre-camber can be reduced by adopting the pre-pressure construction measure in the process of pouring concrete with the hanging basket.The deflection at the top of the pier is 0 and gradually increases in both directions towards the top of the pier.According to the influence factors of the pre-camber,the control method of the pre-camber is put forward,which can avoid the cracking of the long-span continuous beam bridge and further reduce the deflection.The research results can provide reference for the design and construction of long-span continuous beam of high-speed railway.
cantilever constructiondegree of cambercontinuous beam bridgehigh-speed railway
万方数据
维普
