大跨预应力混凝土连续刚构桥纵向预应力钢束优化研究

发布时间：2018-01-12 03:04

本文关键词：大跨预应力混凝土连续刚构桥纵向预应力钢束优化研究　出处：《昆明理工大学》2016年硕士论文　论文类型：学位论文

【摘要】：大跨预应力混凝土连续刚构桥是一种结构整体性好、跨越能力大、造型优美的常用桥型,它即包含了连续梁桥行车平顺的特点,又有T型刚构桥不设支座、施工方便的优点,同时,连续刚构桥在竖向荷载作用下,主梁在梁、墩连接处产生负弯矩有助于减小主梁跨中的正弯矩值。在长期的设计实践中,由于预应力混凝土连续刚构桥纵向预应力钢束配束主要依靠人们积累起来的经验,使得预应力混凝土连续刚构桥纵向预应力钢束的优化设计存在较大的复杂性,因此在大跨径预应力混凝土连续刚构桥设计中,对纵向预应力钢束配束进行优化研究是有必要的。本文以一个已建成的大跨连续刚构桥为工程实例,围绕大跨预应力混凝土连续刚构桥纵向预应力钢束的布置来展开研究,主要完成了以下工作：1、介绍了预应力混凝土连续刚构桥的结构特点,论述了国内外预应力连续刚构桥的发展现状与本文的研究意义。2、对优化分析中经常用到的优化理论与算法进行了简单的介绍,对比得出了不同优化理论之间的优缺点。3、阐述了预应力混凝土连续刚构桥中三向预应力的设计方法以及各种预应力筋锚固体系的选择,提出了连续刚构桥中预应力效应的分析计算方法。4、提出了以钢束类型作为设计优化变量的新想法,以MATLAB为优化计算平台,对比了在不同钢束配束形式下主梁的各个部位的应力值,得出了最合理的预应力钢束配束目标函数。
[Abstract]:Large span prestressed concrete continuous rigid frame bridge is a good overall structure, large span capacity, elegant type used, which contains the characteristics of continuous girder bridge, driving comfort, and has no bearing T type of bridge, the advantages of convenient construction, the continuous rigid frame bridge under vertical load, the girder in the beam. The pier at the junction caused negative moment helps reduce the positive moment across the value. In the long-term practice, the prestressed concrete continuous rigid frame bridge longitudinal prestressed steel beam with beam mainly depends on the people of accumulated experience, the optimization design of prestressed concrete continuous rigid frame bridge longitudinal prestressed steel beam is more complex, so in the design of prestressed concrete continuous rigid frame bridge, the longitudinal prestressed steel beam with beam optimization is necessary. This paper has built a large span continuous rigid frame Bridge as an example, focus on research on layout of concrete continuous rigid frame bridge longitudinal prestressed steel beam prestressed, mainly completed the following work: 1, introduces the structure characteristics of the prestressed concrete continuous rigid frame bridge, discusses the research significance and current status of the development of.2 at home and abroad this paper prestressed continuous rigid frame bridge, the optimization theory and algorithm of optimization often used in the analysis are introduced, comparing the advantages and disadvantages of.3 between different optimization theory, expounds the three design methods of prestressed and prestressed reinforcement anchorage system selection of prestressed concrete continuous rigid frame bridge, puts forward the calculation method of.4 effect analysis of prestressed continuous rigid frame bridge, put forward to the type of steel beam as the new idea of design optimization, MATLAB optimization computing platform, compared the different steel beam with beam form the main beam The most reasonable beam distribution target function of the prestressed steel beam is obtained by the stress value of the part.

【学位授予单位】：昆明理工大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：U448.23

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