铁道标准设计2017，Vol.61Issue(5)：109-113,148,6.DOI:10.13238/j.issn.1004-2954.2017.05.024
呼准铁路黄河特大桥刚构连续梁设计关键技术研究
Research on Key Technologies in the Design of Yellow River Rigid Frame Continuous Beam Bridge on Hohhot-Zhunge'er Railway
杨欣然1
作者信息
- 1. 铁道第三勘察设计院集团有限公司,天津 300142
- 折叠
摘要
Abstract
The extra-long bridge over the Yellow River on Hohhot-Zhunge'er Railway uses rigid frame continuous beam structure with high pier, long span and long unit.Some key technical problems must be settled such as the selection of closure sequences, the determination of closure jacking force, the reduction of creep deflection and the horizontal displacement at the beam end and the bearing.The finite element program is employed in the design to analyze the integral static force of the main bridge, calculate the box girder transverse ring frame, analyze the ductility of the pier in case of rare earthquake and conduct vehicle/bridge interaction.Study results suggest two rigid piers for the main bridge.The first closure is the second middle span followed by the second side span and the side span, and the last is the middle span.By adjusting the tension sequence of the steel beam, the time of the two phase dead load and the external pre-stressed tendon, the creep deflection of the long-span beam is solved.Large horizontal displacement of the beam is accommodated by installing large displacement expansion device and large displacement movable bearing.The results show that the stress and deformation of the rigid frame continuous beam structure meet the specification.关键词
铁路桥/刚构连续梁/合龙顺序/合龙顶力/设计Key words
Railway bridge/Rigid frame continuous beam/Closure sequences/Jacking force of closure/Design分类
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杨欣然..呼准铁路黄河特大桥刚构连续梁设计关键技术研究[J].铁道标准设计,2017,61(5):109-113,148,6.
