Study On The Key Technology Of Curved Continuous Girder Bridges Monitoring

With the development of the high way construction,an increasing number of curved continuous girder bridges show up in our daily life,meanwhile,the span of them are more and more long.Long-span curved continuous girder bridges belongs to statically indeterminate structure,whose alignment and internal force are closely related to its construction steps.The alignment and internal force are easily influenced by the various construction methods and procedures.Because of its special structure line type,the torque of curved continuous girder bridge should not be ignored,which is overlooked in straight bridge.It just is torques,that force in these two bridges are entirely different.While designing those bridges,the basic parameters,such as,curvature radius,concrete elasticity modulus,shrinkage and creep of concrete,the loss of pre-stressing,construction loads,temperature facts,are set through the code and design experience.But,they are still cannot coincide with the actual states totally.To the bridges with medium and small span,the effects of deviation are not so obvious.But to those long-span curved continuous girder bridges,which mostly used cantilevered construction,the parameters are going to effect the alignment and inter force obviously with the increasing cantilever length of the bridges.Sometimes,they‘ll also lead to the difficulty of closure.Therefore,bridge monitoring is of great importance to the long-span curved continuous girder bridges.This thesis is based on an actual curved continuous girder bridge under construction.After analyzing the imitated FEA model,we have summarized the influence of temperature change to the alignment and the inter force,also the function of concrete shrinkage and creep.The paper lists how concrete density and concrete modulus of elasticity affects the alignment and inter force of the curved girder bridge.