既有圬工拱桥承载能力评估方法研究

发布时间：2018-01-14 03:08

  本文关键词：既有圬工拱桥承载能力评估方法研究　出处：《西南交通大学》2014年硕士论文　论文类型：学位论文

  更多相关文章： 圬工拱桥 承载能力评估 桥梁技术状况 荷载试验 校验系数

【摘要】：圬工拱桥尤其是石拱桥在我国乃至世界范围内都大量存在,由于其建设年代久远,承受的荷载已经远远超出当时的设计荷载等级,加上桥梁所处环境的变化,材料性能的退化以及结构自身病害或损伤的开展,大多数既有圬工拱桥存在承载能力不足的现象。如何准确、快速评估此类桥的承载能力是本文研究的方向。1、阐述针对圬工拱桥承载力的国内外研究现状,分析圬工拱桥的受力特点及破坏形态,介绍既有桥梁评估方法,分析比较各种方法的优缺点,建议采用综合评估方法提高评估的可靠度。2、研究圬工拱桥承载能力的影响因素,结合有限元模型提取关键截面的内力,分析对比各因素对主拱受力的影响；通过建立考虑拱上填料及侧墙的实体有限元模型,量化其对活载效应的折减程度；对杆系单元简化评估模型给出合理的处理方式。3、结合文成大桥工程实例,采用新旧标准对其技术状况进行评定,分析对比两种评定方法的优缺点,并对圬工拱桥的技术状况的评定提出合理建议。4、对承载能力检算公式进行合理的修正,结合多座圬工拱桥的荷载试验结果,讨论荷载校验系数的合理取值范围。5、结合文成大桥工程实例,研究讨论检算系数的合理取值,采用基于检测和荷载试验结果引入修正系数的综合评估方法,提高评估的可靠性。
[Abstract]:Masonry arch bridge, especially stone arch bridge, exists in China and even the world. Because of its long construction, the load has been far beyond the design load grade at that time, plus the change of the bridge environment. Due to the degradation of material properties and the development of structural diseases or damage, most existing masonry arch bridges have insufficient bearing capacity and how to be accurate. Rapid assessment of the bearing capacity of such bridges is the research direction of this paper. This paper describes the current situation of research on the bearing capacity of masonry arch bridges at home and abroad, and analyzes the mechanical characteristics and failure patterns of masonry arch bridges. This paper introduces the evaluation methods of existing bridges, analyzes and compares the advantages and disadvantages of various methods, and suggests that comprehensive evaluation methods should be adopted to improve the reliability of the evaluation, and to study the factors affecting the bearing capacity of masonry arch bridges. According to the finite element model, the internal force of key section is extracted, and the influence of various factors on the force of the main arch is analyzed and compared. By establishing the solid finite element model considering the arch packing and the side wall, the reduction degree of the live load effect is quantified. The simplified evaluation model of bar system elements is given a reasonable treatment method. Combining with the engineering example of Wencheng Bridge, the new and old standards are adopted to evaluate the technical status, and the advantages and disadvantages of the two evaluation methods are analyzed and compared. At the same time, the author puts forward reasonable suggestion. 4, and makes a reasonable correction to the formula of checking the bearing capacity of masonry arch bridge, combined with the load test results of many masonry arch bridges. The reasonable value range of load check coefficient is discussed. Combining with the engineering example of Wencheng Bridge, the reasonable value of check and calculation coefficient is studied, and the comprehensive evaluation method based on the test and load test results is introduced into the revised coefficient. Improve the reliability of the evaluation.
【学位授予单位】：西南交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U448.22
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本文编号：1421731