于家堡火车站穹顶网壳双铰支座设计

发布时间：2018-03-02 11:21

本文选题：单层网壳　切入点：螺旋型网格　出处：《铁道工程学报》2014年12期 　论文类型：期刊论文

【摘要】：研究目的:于家堡火车站是新建京津城际延伸线终点站,穹顶是由36根正反螺旋型网格相互编织而成的单层网壳结构。网壳网格形式特殊新颖且跨度达143 m,整个结构受力非常复杂。本文旨在根据网壳结构的整体受力特点和边界条件,确定网壳合适的支座方案。研究结论:(1)支座是网壳结构与下部支承结构连接的关键构件,支座方案的优劣直接关系到网壳边界条件假定是否成立;(2)在确定支座的反力时,既要考虑支座的转动中心与计算模型转动中心不重合引起的附加弯矩的影响,也要考虑罕遇地震工况组合下的反力;(3)穹顶的双铰支座由沿底环梁形心联合转动的底面球型钢支座和侧面球型支座组成,两个支座的中间球面板具有相同的曲率半径,其满足计算假定的边界条件,是一种新型的支座方案;(4)对双支座进行有限元分析和缩尺的加载及转动试验,结果均验证了支座各组成部件的应力和转动性能满足设计要求;(5)双铰支座方案的研究成果可供类似单层网壳结构参考。
[Abstract]:Objective: To study the Jiabao train station is the new Beijing Tianjin Intercity extension line end point station, the dome reticulated shell structure is composed of 36 positive and negative spiral grid mutual woven shell. Grid form special novel and a span of 143 m, the structure of the force is very complex. This paper according to the overall net shell structure stress characteristics and the boundary conditions, determine the shell support schemes suitable. The conclusion of the study: (1) bearing is a key component of connecting shell structure and supporting structure, the support scheme is directly related to the shell boundary condition assumption is true; (2) in determining the bearing reaction force, it is necessary to consider the influence of the rotation center and calculation model bearing rotation center does not coincide with the additional bending moment caused by, should also consider the rare earthquake reaction conditions; (3) double hinged support dome by ring beam joint rotation center along the bottom on the bottom surface of the steel ball bearing and side Spherical bearing, ball bearing two middle panel has the same radius of curvature, the calculation to meet the assumed boundary conditions, is a new type of support schemes; (4) the finite element analysis and scale of double bearing loading and rotation tests results show the support of the components should be force and rotating performance meet the design requirements; (5) research of double hinged support for the similar project of reticulated shell structures.

【作者单位】：铁道第三勘察设计院集团有限公司;
【分类号】：TU399

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