Pre-stressed Continuous Rigid Frame Research Articles

Time-History Analysis of Pre-Stress Loss of Four-Spans Pre-Stressed Continuous Rigid Frame Bridge

Taking Guizhou Hezhang Bridge as the engineering background, this paper used Midas/Civil FEM platform to study the pre-stress loss and deformation of main girder in bridge construction stage and completion stage on the basis of concrete creep and shrinkage formulas provided by “Highway reinforced concrete and pre-stressed concrete bridge design code (JTG D62-2004)” and the US bridge standard – AASHTO LRFD – published in 2005. The results showed that the pre-stress pipeline friction losses calculated according to the two standards are basically the same. The loss of the anchor deformation, elastic compression and tendon relaxation obtained by AASHTO LRFD is slightly greater than that obtained by JTG D62-2004. However, due to the different computing models, both pre-stress loss and the main beam deflection caused by concrete creep and shrinkage obtained by AASHTO LRFD are larger than that by JTG D60-2004.

Design and Test Analysis of Mid-and-Long Term Monitoring System for External Prestressed Continuous Rigid Frame Bridge

Study and design a set of economical and practical mid-and-long term monitoring system for long-span prestressed concrete continuous rigid frame bridge relying on the engineering of Xintan Qijiang Bridge in Chongqing. Master the static characteristics of such parameters as displacement, stress and external cable force during operation process of bridge through finite element model and make a comparative analysis of the relevant data after running for two years to test the feasibility and practicability of mid-and-long term monitoring system for continuous rigid frame bridge suggested in the paper.

Research on Space Simulation Methods for High-Pier Long–Span Pre-Stressed Continuous Rigid Frame Bridges

Along with the fact that more and more high-pier long-span bridges have been constructed in China, especially in western regions of China, the issues relevant to construction safety, load capacity have attracted duly attention of many bridge engineers. Taking Xushuihe Super Bridge of Yumenkou - Yanliang Expressway in Shaanxi Province as an example, the limited space element models including phase construction,concrete box beams, thin - wall hollow piers, pre-stressed main beam tendon, high piers, and regular reinforcement are proposed to be established in this paper. Thoughts and methods are developed for analysis of the space simulation during overall-process construction and operation, and references are given for further research on this kind of bridges.