组合支架在大跨径上承式拱式渡槽现浇施工的应用及优化设计

发布时间：2018-01-12 23:20

本文关键词：组合支架在大跨径上承式拱式渡槽现浇施工的应用及优化设计　出处：《重庆交通大学》2014年硕士论文　论文类型：学位论文

【摘要】：目前贝雷梁配合大直径钢管柱和碗扣钢管支架组成的组合支架在桥梁现浇施工中应用的越来越广泛。但由于对组合支架现在施工过程的研究还不够深入，尤其是类似于本文所研究的龙场渡槽高墩柱、大跨度、重荷载特点的一些工程，时常会产生工程质量问题和安全事故。为了确保施工安全以及工程质量，对组合支架现浇施工中各构件的受力和稳定性进行研究很有必要。论文开头部分主要论述了支架的分类以及组合支架的组成构件和在工程中的应用。然后介绍了支架结构强度、刚度及稳定的相关理论，，详细阐述了有限元方法在支架稳定性分析上的应用。结合龙场渡槽实际工程概况，提出两套组合支架方案，即拱架方案与平台方案，并经过比选，最终确定平台方案为最优方案。利用MIDAS/Civil有限元分析软件分别对平台桁梁、临时钢管支墩建立有限元空间模型，把不同施工阶段现浇拱圈箱梁荷载施加到组合支架上，验算组合支架各构件在施工阶段的受力情况。对临时钢管支墩进行特征值屈曲分析，得到特征值系数及对应的失稳模态。最后计算得到贝雷梁的预拱度。通过电算计算分析，本文所设计的组合支架不仅能很好的满足本工程的安全施工需要和质量保证，在其他同类型桥梁建设中或者在梁桥箱梁现浇建设中，都能很好的保证施工质量，保障施工安全。
[Abstract]:At present, the combined support composed of large diameter steel tube column and bowl buckle steel pipe support is more and more widely used in the construction of bridge cast-in-place, but the research on the construction process of the composite support is not deep enough. In particular, similar to the Longchang aqueduct high pier column, long span, heavy load characteristics of some projects, often cause engineering quality problems and safety accidents, in order to ensure construction safety and engineering quality. It is necessary to study the force and stability of each component in the construction of composite support. At the beginning of the paper, the classification of the bracket, the components of the composite bracket and its application in engineering are discussed. Then, the related theories of strength, stiffness and stability of the support structure are introduced. The application of finite element method in stability analysis of support is described in detail. Combined with the actual engineering situation of Longchang Aqueduct, two sets of combined support schemes, namely, arch frame scheme and platform scheme, are put forward, and compared with each other. MIDAS/Civil finite element analysis software is used to establish the finite element space model of platform truss and temporary steel pipe pier. The load of cast-in-place arch ring box girder is applied to the composite support in different construction stages, and the stress of each component of the composite support in construction stage is checked. The eigenvalue buckling analysis of temporary steel pipe pier is carried out. The eigenvalue coefficients and the corresponding instability modes are obtained. Finally, the precamber of the Beere beam is calculated. Through computer calculation and analysis, the combined support designed in this paper can not only meet the safety construction needs and quality assurance of the project, but also be used in the construction of other similar bridges or cast-in-situ construction of box girder of girder bridge. Can very good guarantee construction quality, guarantee construction safety.
【学位授予单位】：重庆交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U445.4

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