Analysis Of Shrinkage And Creep For Rigid Frame Bridge's Deflections And For The Course Of Diagonal Cracks In Box Girder

Shrinkage and creep are the inherent time-dependent characters of concrete which belongs to a viscoelastic material. It is important to accurately estimate and predicate the deformation and long-term deflection of long-span bridges with high piers which arise from the effect of shrinkage and creep for engineering design, quality control and construction process.Long--span continuous rigid frame bridges are sensitive to shrinkage and creep. Error with respect to the predication of shrinkage and creep would lead to some difficulty of connection for segmental, cast-in-place concrete cantliver bridges and lead to deterioration of serviceability problems, aesthetics and eventually early reconstruction of the bridges.With the Huluding Bridge as the engineering background, Using a finite element software--MIDAS/Civil to analyze the effect of shrinkage and creep to lon--span bridges with cantilever construction. This thesis discuss the rule of rigid frame bridge's deflections by means of creating a finite element model and combining with the deflections in construction surveillance and control, meanwhile to furnish some effective data for construction and lon--term tim--dependent deformation monitoring.According to the problem of diagonal cracks existing on box girder webs, Author creates a finite element model to analyze the cracking causes primary from prestressed loss and other aspects and summarizes the causes of diagonal cracks and presents some measure to prevent cracks.This thesis provides reference for the following construction surveillance and control of Huluding Bridge and accumulates some scientific research experience. It provides a reference for the similar projects.