连续梁桥悬臂施工临时固结措施及其影响研究

发布时间：2018-08-26 20:36

【摘要】：临时固结作为保证连续梁桥悬臂施工安全性和稳定性的重要措施之一,如何使临时固结的设置对悬臂施工中桥梁结构的内力、挠度和稳定性有利,这是工程设计、施工控制中的重要问题。本文结合实际工程,就临时固结各种现行做法对桥梁内力、挠度、稳定性的影响进行研究,探究合理的临时固结形式和结构参数,以保证桥梁悬臂施工的可靠性、合理性和经济性。本文具体研究了以下几个要点：(1)论文对连续梁桥临时固结常见构造的具体形式进行分析,并按照临时固结受力特点对其归纳分类,探索各类临时固结的适用条件和优缺点,并总结临时固结在设计和施工中的注意事项。(2)论文介绍了工程中常见的临时固结模拟方法,并结合实际工程探究临时固结模拟方法及临时固结支承刚度对计算结果的影响,总结各模拟方法的优缺点和适用范围,为工程中临时固结的模拟分析提供参考。(3)论文通过对连续梁桥临时固结进行受力分析,得到桥梁内力、挠度与临时固结参数的关系,总结临时固结结构性能的主要影响因素。再通过建立桥梁有限元模型,分析不同临时固结形式及结构参数对桥梁结构应力和挠度的影响,得出临时固结结构参数的设计范围和对桥梁的影响规律。论文还就临时支座的设置对桥梁的影响进行研究分析,得到临时支座的设置原则。最后论文对临时固结形式及结构参数对主梁长期挠度的影响进行分析,得到临时固结对主梁长期挠度的影响规律,对临时固结的设计和施工提供一定的参考。(4)论文简要介绍连续梁桥悬臂施工的稳定性理论,并基于特征值屈曲理论就临时固结对最大悬臂状态下连续梁桥施工稳定性的影响进行分析并得出影响规律。同时还分析了临时支墩系梁设置对高墩连续梁桥施工稳定性的影响,得到系梁的设置原则,为工程中合理设置系梁提供参考。(5)论文概括总结了优化设计的一般数学模型和基本方法,并采用罚函数法(SUMT)编写优化程序对三类临时固结进行参数优化分析,得到临时固结参数的优化设计结果,为工程中临时固结的选择和设计提供参考。
[Abstract]:Temporary consolidation is one of the important measures to guarantee the safety and stability of cantilever construction of continuous beam bridge. How to make the temporary consolidation of bridge structure favorable to the internal force, deflection and stability of the bridge structure in cantilever construction is the engineering design. Important problems in construction control. Combined with practical engineering, this paper studies the influence of various current methods of temporary consolidation on bridge internal force, deflection and stability, and probes into reasonable temporary consolidation form and structural parameters to ensure the reliability of bridge cantilever construction. Rationality and economy. The main points of this paper are as follows: (1) the paper analyzes the concrete forms of the common structures of temporary consolidation of continuous girder bridges, and induces and classifies them according to the characteristics of temporary consolidation forces, and explores the applicable conditions, advantages and disadvantages of all kinds of temporary consolidation. And summarizes the matters needing attention in the design and construction of temporary consolidation. (2) the paper introduces the common methods of temporary consolidation simulation in engineering, and probes into the influence of temporary consolidation simulation method and the stiffness of temporary consolidation support on the calculation results. The advantages and disadvantages and applicable scope of each simulation method are summarized, which provides a reference for the simulation analysis of temporary consolidation in engineering. (3) by analyzing the force of temporary consolidation of continuous beam bridge, the relationship between bridge internal force, deflection and temporary consolidation parameters is obtained. The main factors affecting the properties of temporary consolidation structures are summarized. By establishing the finite element model of the bridge, the influence of different temporary consolidation forms and structural parameters on the stress and deflection of the bridge structure is analyzed, and the design range of the parameters of the temporary consolidation structure and the influence law on the bridge are obtained. The paper also analyzes the influence of temporary support on bridge, and obtains the setting principle of temporary support. Finally, the effect of temporary consolidation form and structural parameters on the long-term deflection of the main beam is analyzed, and the effect of the temporary consolidation on the long-term deflection of the main beam is obtained. It provides a certain reference for the design and construction of temporary consolidation. (4) the stability theory of cantilever construction of continuous beam bridge is briefly introduced in this paper. Based on the eigenvalue buckling theory, the influence of temporary consolidation on the construction stability of continuous beam bridges under the maximum cantilever state is analyzed and the influence law is obtained. At the same time, it also analyzes the influence of the temporary supporting piers on the construction stability of the continuous beam bridge with high piers, and obtains the setting principle of the tie beam. (5) the paper summarizes the general mathematical model and basic methods of optimal design, and uses penalty function method (SUMT) to compile optimization program to optimize the parameters of three kinds of temporary consolidation. The optimal design results of the temporary consolidation parameters are obtained, which provides a reference for the selection and design of the temporary consolidation in engineering.
【学位授予单位】：东南大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U445.4

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