Research On Shrinkage-Creep And The Prestress Loss For Long-Span Curve Continuous Rigid-Frame Bridges

In recent years, high-grade ways begin enter the South mountain areas under the backgroung of the rapid development of our counties’transport,so long-span curve continuous rigid-frame bridges arise at the historic moment. It is combines the mechanical properties of curved girder bridge and rigid ftame bridge, the structural analysis is more complicated than rigid ftame bridge because of the couping characteristics of bending moment,shear force and tourisonal moment.Taking LiangTaihe bridge on the Yichang to Badong section of YiBa speedway in Huibei province as the engineering background,establish finite element model with the FEM softwear of MIDAS/CIVIL2012,the main research work is summarized as follows:First,summarizes the history of the curve bridges’development and the actual state, introduction curve rigid frame bridge in our country’s development,describes the commonly used theory incurved rigid frame bridges.Second, Taking LiangTaihe bridge as the engineering background,apply the space straight beam element and considering the effects of the radius of curvature, establishment the finite element model of LiangTaihe river bridge and analysis the construction process.Third,comparative analysis of the measured value and theoretical value, shows that MIDAS/CIVIL can better simulation the process of bridge of cantilever construction,the theory and the method this paper based on about theoretical analysis and numerical method also can better reflect the actual situation,it may provide some references for construction of curve continuous rigid-frame bridges.Fourth,under the prerequisite condition of just changing curvature, establish several models of curved and straight continuous rigid flame bridge.Get the internal force and deformation influenced by shrinkage and creep with analysis the bridges with different radius of curvature.Last, by changing the radius of curvature,analysis the prestress loss of long-span curved continuous rigid-frame bridge, comparative analysis the partial prestressing loss of different radius of curvature of the curve continuous rigid-frame bridge.