山区混凝土梁桥延性抗震性能评估

发布时间：2018-03-04 12:11

本文选题：桥梁工程　切入点：延性　出处：《长安大学》2014年硕士论文　论文类型：学位论文

【摘要】：山区混凝土梁桥作为一种最常采用的结构形式，在我国桥梁工程中占有重要作用。其在地震灾害发生后的破坏程度将直接影响到道路的顺畅以及灾后的重建工作。因此，准确评估山区混凝土梁桥的延性能力，定性的对山区梁桥的抗震性能有个全面的认识和把握，对于保证桥梁结构在地震作用后的安全性具有重要意义。鉴于此，本文在对山区混凝土桥梁进行充分调研的基础上，对山区混凝土梁桥的延性抗震性能做了以下几个方面的工作：（1）根据相关文献资料调查，介绍了桥梁延性抗震设计的方法，归纳总结了基于性能设计的Pushover分析方法的适应性及主要应用研究成果。（2）根据既有桥梁的设计资料，应用有限元程序SAP2000截面分析模块，，对不同跨径、不同截面形式以及不同设计参数下，山区混凝土梁桥墩柱截面的弯矩-曲率关系进行计算与分析，得到不同设计参数下墩柱的弯矩-曲率曲线，计算其延性系数。通过对截面不同设计参数的分析，研究了钢筋的配置对桥墩延性能力的影响。（3）在结合Pushover分析方法的概念、原理以及实现方法的基础上，给出了一种基于Pushover分析的桥梁延性抗震能力评估方法。介绍了该方法中地震损伤模型的选择、损伤指数的确定以及具体的实施步骤。（4）结合山区混凝土梁桥的特点，结合实际桥梁结构，根据前述理论进行分析，对其延性抗震能力进行评估。
[Abstract]:As one of the most commonly used structural forms, concrete beam bridges in mountainous areas play an important role in bridge engineering in China. The damage degree of concrete beam bridges after earthquake disaster will directly affect the smooth road and reconstruction work after the disaster. It is of great significance to evaluate the ductility of concrete beam bridges in mountainous areas accurately and qualitatively to understand and grasp the seismic behavior of girder bridges in mountainous areas, which is of great significance to ensure the safety of bridge structures after earthquake. Based on the investigation of concrete bridges in mountainous areas, the ductile seismic behavior of concrete beam bridges in mountainous areas is studied in this paper as follows:. 1) based on the investigation of relevant literature, this paper introduces the methods of ductile seismic design of bridges, and summarizes the adaptability and main application research results of Pushover analysis method based on performance design. According to the design data of existing bridges and using the finite element program SAP2000 section analysis module, this paper calculates and analyzes the moment curvature relation of the section of concrete bridge pier and column in mountainous area under different span, different section form and different design parameters. The moment curvature curve of pier column under different design parameters is obtained and its ductility coefficient is calculated. The influence of reinforcement configuration on ductility capacity of pier is studied by analyzing different design parameters of section. On the basis of the concept, principle and implementation of Pushover analysis method, a method for evaluating the ductility seismic capacity of bridges based on Pushover analysis is presented. The selection of seismic damage model in this method is introduced. The determination of damage index and the specific implementation steps. Combined with the characteristics of concrete beam bridge in mountainous area and the actual bridge structure, the ductile seismic capacity of the bridge is evaluated according to the theory mentioned above.
【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】：U442.55;U448.33

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