东海岛铁路立体交叉框架桥差异化设计与分析

摘要

以新建湛江东海岛铁路某框架中桥为工程背景,阐述小角度铁路立体交叉框架桥在不同土层上的总体布置,利用Midas civil软件对不同节段框架进行空间力学分析,优化结构配筋;结合特殊地形条件采用预应力管桩、水泥土搅拌桩、抗滑隼等地基加固措施确保基底承载力满足规范要求.结果表明,对于较长框架结构,考虑荷载作用、地质等因素进行差异化设计,不仅使结构受力得到较大改善,同时在工程投资方面也取得了较好的经济效益.%Based on a certain frame bridge in the newly-built East Island railway in Zhanjiang, this paper expounds the general layout of the small angle railway framed junction in different soil layers.With the use of Midas civil software, the space mechanics of different segments is analyzed to optimize the structure reinforcement;Considering the special terrain conditions, prestressed pipe pile, cement soil mixing pile and anti-slide pile are adopted to reinforce the bearing capacity of the base.The results show that the differential design for the long frame structure not only improves the structure stress, but also achieves good economic benefits in the engineering investment.