预应力节段拼装墩拟静力试验和分析研究

发布时间：2018-02-28 23:26

本文关键词： 节段拼装桥墩拟静力试验抗震性能和破坏机理非线性纤维梁柱单元参数分析　出处：《重庆交通大学》2015年硕士论文　论文类型：学位论文

【摘要】：随着国家发展的需要,为了进一步推进国家建设,我国正在积极规划着跨海海峡桥、高铁高架桥、高速立交桥、城市立交等建设项目。但是,目前桥梁结构设计面临两方面的难题挑战,一是满足桥梁结构的安全性和耐久性;二是利用新的技术手段来缩短工期,以此减少交通的阻塞、生态坏境的冲击、施工中噪音的产生。这些难题的提出,不仅要求施工技术手段的提高,更需要引进或创新出新结构设计理念并利用大量有效的试验来实现突破。我国节段拼装墩已有实际工程应用,但试验研究仍在继续。但我们理应看到,预制拼装结构体系在灾害抢险、大型跨海(跨江)工程等领域具有较好的应用前景,其缺点可以通过合理设计节段尺寸和接缝连接构造来克服。综合起来,本文主要进行了以下几部分的工作:①基于对大量国内外文献的查阅,总结了国内、国外研究者针对节段拼装桥墩所做的试验研究和理论研究,清晰化了该类桥墩体系的发展历史和发展方向。同时,总结了国内外该项技术的工程实用状况。②为研究预应力节段拼装桥墩的抗震性能和破坏机理,制定了一套可行的拟静力试验方案。该方案包括五组试件,其中已完成全部试件的预制,三组试件的试验已经完成。③通过已完成拟静力试验,对比分析三组试件的破坏形态、易损部位、滞回特性、骨架曲线、刚度、延性性能、残余变形、预应力钢筋应力变化、曲率等。④结构分析软件OpenSees作为计算平台,通过三维有限元模型的建立,采用非线性纤维梁柱单元对节段拼装桥墩的抗震性能进行数值模拟分析。主要对第三组试件的数值模拟分析结果和试验结构进行对比,验证了其有限元方法数值模拟的可靠性。⑤后三组试件无剪力键设置。通过不同的张拉预应力形成预应力连接的接缝形式,通过所建立的有限元数值模型进行不同张拉预应力模拟试件的计算分析。对比各试件的滞回曲线和骨架曲线,初步分析张拉预应力大小对有限元数值模型的抗震性能的影响。
[Abstract]:With the needs of national development, in order to further promote national construction, China is actively planning projects such as cross-sea straits bridge, high-speed rail viaduct, high-speed interchange, urban interchange and other construction projects. At present, bridge structure design is faced with two difficult challenges, one is to meet the safety and durability of bridge structure, the other is to use new technical means to shorten the construction period so as to reduce the impact of traffic congestion and ecological environment. The noise generation in construction. These difficult problems not only require the improvement of construction technology, It is more necessary to introduce or innovate new structural design concepts and make use of a large number of effective tests to achieve the breakthrough. The practical engineering application of segmental assembly piers in China is already in use, but the experimental research is still continuing. But we should see that, The prefabricated structure system has a good application prospect in the field of disaster rescue and large-scale cross-sea (cross-river) engineering, and its shortcomings can be overcome by reasonable design of segment size and joint structure. In this paper, the following parts of the work: 1 based on a large number of domestic and foreign literature review, summarized the domestic and foreign researchers for segmental assembly of piers experimental research and theoretical research, The development history and development direction of this kind of pier system are clearly clarified. At the same time, the practical engineering situation of this technology at home and abroad is summarized to study the seismic behavior and failure mechanism of prestressed segment assembled pier. A set of feasible pseudostatic test schemes was developed. The scheme includes five groups of specimens, in which all the specimens have been prefabricated, and the three groups of specimens have completed the 3. 3 completed pseudostatic tests, and the failure patterns of the three groups of specimens have been compared and analyzed. The software OpenSees of vulnerability, hysteretic property, skeleton curve, stiffness, ductility, residual deformation, stress change of prestressed steel bar, curvature and so on, is used as the calculation platform, and the three-dimensional finite element model is established. Nonlinear fiber Liang Zhu element is used to simulate and analyze the seismic behavior of segmented piers, and the results of numerical simulation analysis of the third group of specimens are compared with the experimental structures. The reliability of the finite element method for numerical simulation is verified. The three groups of specimens have no shear bond setting after 5. The joint forms of prestressed connections are formed by different tensioning prestressing forces. The finite element numerical model is used to calculate and analyze the simulated specimen of different tensioning prestress, and the hysteretic curve and skeleton curve of each specimen are compared, and the influence of tensioning prestress on the seismic behavior of finite element numerical model is preliminarily analyzed.
【学位授予单位】：重庆交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U446;U445.57

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