Analysis the Prestress Loss of Prestressd Concrete Continuous Girder Bridges in Cantilever Construction Stage

Pengtao JIA, Tingjie ZHANG

Department of Civil Engineering & Architecture, Chongqing Jiaotong University, Chongqing 400074, CHINA

Abstract: By using the finite element software Midas civil and the engineering of Bai La Zai first four-wire bridge to establishment of 3D entity model of prestressed concrete continuous girder bridges in cantilever construction stage. To find out the relationship between “the effective prestress loss” and “disease of beam body” on the cantilever construction stage of continuous girder bridge. From the aspects of “friction loss, loss of anchorage, loss of stress by the elastic of concrete and loss of stress caused by shrinkage and creep of concrete“ to explore the loss of prestress on the cantilever construction stage. Provide suggestion for the design of prestressed concrete continuous beam bridge, the construction stage and prevention and treatment the disease at the stage of operation. What’s more, the theoretical achievements not only give a way to control the extent of cracking and deflection but also to offer theoretical foundations for further research.

Keywords: Cantilever Construction; Elastic Compression; Prestress Loss