双层高架连续梁桥抗震性能研究

发布时间：2018-05-01 17:10

本文选题：双层高架连续梁桥 + 自振特性　；参考：《哈尔滨工业大学》2017年硕士论文

【摘要】：大规模的城镇化建设和崎岖的山区环境,使得某些地区桥梁建设用地日益紧张。双层乃至多层高架桥能有效的解决桥梁建设用地不足的问题,故近些年来此种桥型的修建呈快速发展的趋势。在服务国民经济的同时,双层连续梁桥不可避免的修建于地震区,而现行抗震规范只是对单层桥梁的地震响应简化计算进行了规定,尚无关于双层连续梁桥的抗震计算规定,同时已有的双层连续梁桥相关研究也较为少见。鉴于双层连续梁桥在公路工程和市政工程中的“生命线”功能,有必要对其抗震性能进行系统的研究。本文主要采用仿真模拟方法,拟对典型双层连续梁桥的地震响应规律及其减隔震控制方法进行较系统全面的理论分析,包括桥墩强度和位移等抗震控制指标,以补充和完善现行桥梁抗震设计相关规范。本文的研究对于我国双层或多层连续梁桥的抗震设计,具有重要的理论意义、十分现实的工程背景和应用价值。本文的主要研究内容如下:首先对双层连续梁桥的自振动力特性进行了分析,找寻不同支座布置形式对振型及频率等影响,并进行纵向及横向反应谱分析,总结地震作用下双层连续梁桥的动力响应特点。然后介绍了梁桥地震激励时程分析等相关结构动力学理论,包括桥梁墩柱纤维单元截面的划分、双层连续梁桥模型的建立。为进一步发现其动力响应规律尤其是强震作用下的非线性行为,对双层连续梁桥输入人工生成地震波激励并进行时程分析,以研究其在罕遇地震下的动力响应特点及规律。最后研究了实际震害中可能发生的碰撞问题,与未考虑碰撞的响应结果进行对比,引入了几种成熟、可靠的减隔震措施,并对减隔震效果进行了对比,给出相应建议。
[Abstract]:Large-scale urbanization and rugged mountain environment make some areas of bridge construction land increasingly tight. Double-layer or even multi-story viaduct can effectively solve the problem of insufficient land for bridge construction, so in recent years, the construction of this type of bridge shows a trend of rapid development. While serving the national economy, the double-deck continuous beam bridge is inevitably built in the earthquake area, but the current seismic code only provides for the simplified calculation of the seismic response of the single-layer bridge, but there is no seismic calculation regulation for the double-deck continuous beam bridge. At the same time, the existing double-deck continuous beam bridge related research is also relatively rare. In view of the "lifeline" function of double-deck continuous beam bridge in highway and municipal engineering, it is necessary to study its seismic performance systematically. In this paper, the seismic response law and seismic isolation control method of typical double-deck continuous beam bridge are analyzed systematically and comprehensively, including seismic control indexes such as pier strength and displacement. In order to supplement and improve the current seismic design of bridges related to the code. The research in this paper is of great theoretical significance and practical engineering background and application value for the seismic design of double-deck or multi-story continuous beam bridges in China. The main contents of this paper are as follows: firstly, the characteristics of self-vibration force of double-deck continuous beam bridge are analyzed, and the effects of different bearing arrangement on vibration mode and frequency are found, and the longitudinal and transverse response spectra are analyzed. The dynamic response characteristics of double-deck continuous beam bridge under earthquake action are summarized. Then the structural dynamics theory such as seismic excitation time history analysis of beam bridge is introduced, including the partition of fiber element section of bridge pier and column, and the establishment of two-layer continuous beam bridge model. In order to find out the dynamic response law, especially the nonlinear behavior under strong earthquake, the dynamic response characteristics and law of the double-deck continuous beam bridge under rare earthquake are studied by means of time-history analysis and the excitation of artificially generated seismic wave in the input of double-deck continuous beam bridge. Finally, the possible collision problems in the actual earthquake damage are studied, and compared with the response results without considering the impact, several mature and reliable isolation measures are introduced, and the results of the isolation are compared, and the corresponding suggestions are given.
【学位授予单位】：哈尔滨工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U442.55

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