铁路矮塔斜拉桥单箱多室截面横向受力研究

研究目的:津保铁路子牙河特大桥主桥采用(32.7+56+84)m矮塔斜拉桥结构体系,横向为单箱四室箱形截面。本桥桥面宽达23 m,为我国铁路矮塔斜拉桥之最,必须对其横向受力进行分析。研究结论:通过对横向框架的受力分析,确定了本桥横向预应力钢束的形状和数量。由于温度荷载的影响,本桥钢束采用小角度弯起的钢束形状。裸梁阶段,在日照荷载作用下,顶板下缘出现部分拉应力,施工过程中需采取措施避免日照荷载直接作用。本文单箱多室箱形截面的横向受力分析过程,可为铁路桥梁单箱多室结构横向分析计算提供一种合理的设计思路。

Research on the Transverse Force of Railway Low - pylon Cable - stayed Bridge with Section by Single Box and Multi- cell

Research purposes: The main bridge of Ziya River bridge in Jinbao Railway was chosen as low-pylon cable-stayed bridge,whose span is 32.7 m+56 m+84 m,with box section by one box and four rooms.The bridge has the most widest deck width of 23 m in China’s railway cable-stayed bridge,The transverse force performance is very necessary to be researched. Research conclusions:The shape and number of the transverse prestressing tendons were determined by the analysis.The prestressing tendons was bended with small angle because of temperature loads.Tensile press will appear in the construction process with temperature loads,so take measures to avoid direct sunshine load in Construction stage is essential.A reasonable design idea was proposed to the calculation and analysis of the transverse force of single box and multiple rooms structure for bridge of railway.