大跨钢箱梁桥顶推施工安全控制研究

发布时间：2018-01-13 20:07

本文关键词：大跨钢箱梁桥顶推施工安全控制研究　出处：《长安大学》2014年硕士论文　论文类型：学位论文

【摘要】：随着经济的快速发展，桥梁跨径的不断增加，钢箱梁桥在桥梁建设中得到了快速发展。近年来，钢箱梁以其轻质、刚度大、安装便捷、结构新颖等优点在国内得到了广泛应用。钢箱梁一般采用等截面进行设计，适宜采用顶推法施工。然而由于钢箱梁顶推施工法的特殊性，顶推施工过程中存在大量的技术风险，同时顶推施工中钢箱梁受力体系在不断转换，结构受力复杂，加强施工风险控制和结构安全有助于桥梁保证顶推施工的顺利进行，因此本文主要开展顶推法施工大跨钢箱梁桥施工安全控制的研究工作。本文以沈阳后丁香大桥和联络左线特大桥为依托工程，对同类桥型开展大跨钢箱梁顶推施工安全控制研究工作，本文的工作主要如下： (1)对桥梁结构施工控制的内容、方法和结构分析方法进行了研究和总结； (2)利用有限元软件Midas/civil对大跨钢箱梁桥顶推施工过程中的结构整体受力性能进行了分析，，提供了可靠的监测依据，并通过现场调控结果对其安全性进行评定；利用整体分析结果，对钢箱梁在最不利工况下的局部受力情况进行了分析，并分析了局部加劲和增大局部受力面积两种措施对局部受力的影响；同时针对主梁在顶推施工过程中的受力问题，对顶推施工的结构设施进行优化设计； (3)采用现场调查法对大跨钢箱梁顶推施工过程的潜在风险进行识别，并建立风险评估体系，基于层次分析法(Analytic Hierarchy Process,AHP)和模糊综合评判法(FuzzyComprehensive Evaluation, FCE)对进行桥梁施工期的风险评价，根据评定结果和施工经验，对大跨钢箱梁顶推施工进行风险控制。
[Abstract]:With the rapid development of economy and the increasing span of the bridge, the steel box girder bridge has been developed rapidly in the bridge construction. In recent years, the steel box girder with its light weight, large stiffness, convenient installation. The advantages of novel structure have been widely used in China. Steel box girder is generally designed with equal section and suitable for construction by pushing method. However, due to the particularity of the method of steel box girder jacking construction. There are a lot of technical risks in the process of push-push construction. At the same time, the mechanical system of steel box girder is constantly changing, and the structure is complicated. Strengthening the construction risk control and structural safety is helpful to ensure the smooth construction of the jacking construction. Therefore, this paper mainly carries out the research work of safety control of large-span steel box girder bridge construction by pushing method. This paper is based on Shenyang Houlushan Bridge and the connection left Line Bridge. The main work of this paper is as follows: (1) for the similar bridge type, the safety control work of the large span steel box girder jacking construction is carried out. 1) the contents, methods and structural analysis methods of bridge structure construction control are studied and summarized. In this paper, finite element software Midas/civil is used to analyze the overall mechanical behavior of large span steel box girder bridge during jacking construction, which provides a reliable monitoring basis. The safety was evaluated by the results of field control. Based on the results of the whole analysis, the local stress of steel box girder under the most unfavorable working conditions is analyzed, and the influence of local stiffening and increasing the area of local stress on the local force is analyzed. At the same time, aiming at the stress problem of the main beam in the process of jacking construction, the optimization design of the structure and facilities of the jacking construction is carried out. (3) the potential risk of large span steel box girder jacking construction is identified by field investigation method, and the risk assessment system is established. Based on Analytic Hierarchy Process. AHP) and Fuzzy Comprehensive Evaluation (FCEE) are used to evaluate the risk of bridge construction. According to the evaluation results and construction experience, the risk control of long span steel box girder jacking construction is carried out.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U445.1;U448.213

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