梁式桥防落梁加固技术研究

发布时间：2018-01-15 18:43

本文关键词：梁式桥防落梁加固技术研究　出处：《中国地震局工程力学研究所》2016年硕士论文　论文类型：学位论文

【摘要】：从国内外历次大地震来看,桥梁落梁都是一种非常严重震害。在我国的地震高烈度区——西南地区,大多是山区桥梁,其中梁式桥占有很大比重。近几次大地震可以看出,在强烈地震作用下梁式桥往往会出现落梁震害,不仅修复困难,更为严重的是山区桥梁往往是通往灾区陆路交通的咽喉,一旦遭到破坏,将直接切断交通线路,严重阻碍灾区救援。目前我国对桥梁防落梁技术研究还不够系统、全面,也没有相应的技术规范。本文对梁式桥顺桥向防落梁加固技术进行研究,对工程中的防落梁措施提出建议,以最大限度地减少桥梁落梁震害的发生,主要内容如下:1.论述了本文的选题背景和研究意义,介绍了防落梁系统及研究现状。2.以某一多跨简支梁桥为算例,进行midas建模;选用三条具有不同频谱特性的地震动,调整其峰值加速度,进行桥梁地震反应分析,使地震动输入桥梁结构后发生落梁。3.针对三种防落梁技术(梁间拉索措施、墩梁拉索措施、转连续梁措施)开展研究。通过地震反应分析,研究了三种加固技术对简支梁桥进行防落梁加固的效果,并对加固效果进行了对比。4.对墩梁拉索措施的参数开展了研究,分析拉索长度、缓冲间隙、拉索截面积对其防落梁效果的影响。对连续梁桥的墩梁拉索加固措施进行了初步研究。
[Abstract]:From the major earthquakes at home and abroad, the bridge beam fall is a very serious earthquake damage. In the high seismic intensity region of China-southwest region, most of them are mountain bridges. Beam bridges account for a large proportion of them. In recent years, it can be seen that under the action of strong earthquakes, beam bridges often appear the damage of falling beam, not only difficult to repair. What is more serious is the mountain area bridge often is the throat which leads to the disaster area land transportation, once destroyed, will directly cut off the traffic line. At present, the research on bridge anti-falling beam technology in our country is not systematic, comprehensive, and there is no corresponding technical specification. In this paper, the beam bridge down-bridge anti-falling beam reinforcement technology is studied. In order to reduce the earthquake damage of bridge beam fall to the maximum extent, the main contents are as follows: 1. The background and significance of this paper are discussed. This paper introduces the anti-drop beam system and its research status. (2) taking a multi-span simply supported beam bridge as an example, the midas modeling is carried out. Three seismic ground motions with different spectral characteristics are selected to adjust the peak acceleration and to analyze the seismic response of the bridge. After the ground motion is input into the bridge structure, the beam drop occurs. 3. The research is carried out on three kinds of anti-falling beam technology (cable between beams, cable piers and continuous beam). The seismic response analysis is carried out. This paper studies the effect of three kinds of reinforcement techniques on the anti-drop beam reinforcement of simply supported beam bridge, and compares the strengthening effect. 4. The parameters of the measures of the pier beam cable are studied, and the length of the cable and the buffer gap are analyzed. The effect of cable cross section area on the effect of anti-falling beam is studied. The reinforcement measures of pier and beam of continuous beam bridge are studied.
【学位授予单位】：中国地震局工程力学研究所
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：U445.72

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