顶推施工中临时墩位置对梁体制造误差的影响

根据连续梁桥顶推施工的特点和顶推过程中内力的变化规律，利用结构力学位移法建立简化的结构计算模型．采用该结构模型，分析了临时墩位置对梁体制造误差的影响，对临时墩位置与连续梁桥项推施工过程中梁段尾端转角之间的关系进行了推导和计算，得出了有利于减少梁体制造误差的理论上最优的临时墩位置，并以珠江大桥西桥为工程实例，验证了临时墩优化分析结果的正确性．

Effect of Location of Temporary Pier in Incremental Launching Construction on Manufacture Error of Girder

According to the characteristics of the incremental launching construction for continuous girder bridges and the variation of the internal force during the construction, a simplified structural calculation model was established by means of the displacement method. The proposed model was then used to analyze the effect of the location of temporary pier on the manufacture error of the girder and to reveal the relationship between the location and the corners at the ends of the incremental segments during the incremental launching construction of the continuous girder bridge. Consequently, the optimum position of the temporary pier propitious to the reduction of manufacture error was obtained. The proposed model was finally applied to the project of Zhujiang Western Bridge, the results verifying the correctness of the optimization results.