呼准铁路黄河特大桥刚构连续梁设计关键技术研究

发布时间：2018-05-06 14:51

本文选题：铁路桥 + 刚构连续梁　；参考：《铁道标准设计》2017年05期

【摘要】：呼准铁路黄河特大桥主桥采用高墩、长联、大跨刚构连续梁的结构形式,为了确保结构设计安全,需要解决以下关键技术问题:选择合龙顺序、确定合龙顶力、减小梁体徐变下挠、解决梁端和支座处较大的水平位移等。结构设计时运用有限元程序对主桥进行了整体静力分析、箱梁横向环框计算、桥墩罕遇地震延性分析以及车桥耦合动力仿真分析等详细计算,确定主桥为2个固结墩;采用先合龙次中跨、再次边跨、然后边跨、最后中跨的合龙顺序;在设计条件下采用9 000 kN的跨中合龙顶力;通过调整钢束张拉顺序、二期恒载上桥时间以及预留体外预应力束等措施解决大跨梁的徐变下挠;通过设置梁端大位移伸缩装置及大位移活动支座适应梁体较大的水平位移。结果证明刚构连续梁的结构受力和变形均满足规范要求。
[Abstract]:The main bridge of Huzheng Railway Yellow River Bridge adopts the structural form of high pier, long connection and long span rigid frame continuous beam. In order to ensure the safety of structure design, the following key technical problems need to be solved: selecting the closing sequence and determining the closing top force. Reduce the creep deflection of beam and solve the large horizontal displacement at the end of beam and support. The whole static analysis of the main bridge, the calculation of the transverse ring frame of the box girder, the ductility analysis of the bridge pier under rare earthquake and the dynamic simulation analysis of the vehicle-bridge coupling are carried out by using the finite element program when the structure is designed. The main bridge is determined to be two consolidation piers. Adopt the closure sequence of first closing middle span, second edge span, then edge span, and final middle span; under the design condition, adopt 9 000 kN roof force of middle span; by adjusting the tension sequence of steel bundle, The second stage dead load bridge time and the reserved external prestressing beam are used to solve the creep deflection of long span beam, and the large displacement telescopic device at the end of the beam and the long displacement active support are set up to adapt to the larger horizontal displacement of the beam body. The results show that the structural force and deformation of rigid frame continuous beam meet the requirements of the code.
【作者单位】：铁道第三勘察设计院集团有限公司;
【分类号】：U445.4

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