地震作用下简支梁桥防落梁装置分析

发布时间：2018-01-31 07:33

本文关键词： 防落梁装置缓冲材料相对位移动力时程分析　出处：《重庆交通大学》2014年硕士论文　论文类型：学位论文

【摘要】：近几十年，地震频繁发生，对建筑结构尤其是桥梁结构的破坏极大，因此针对地震作用下的桥梁采用合理保护措施就变得十分必要。一般情况下，桥梁结构在地震作用下的破坏形式有：上部结构的震害、支撑连接件的震害、落梁震害、下部结构和基础震害，其中最为常见的是落梁震害。在地震作用下，防落梁装置是防止桥梁上部结构落梁破坏的最终保护措施。本文主要研究的是：结合国内外已有防落梁系统的相关规定，选用合适的防落梁装置，并分析地震作用下防落梁装置对桥梁结构地震响应的影响。本文选择一座非规则的七跨简支梁桥，采用不同场地条件下的三条地震波，通过动力时程分析，计算比较了该桥在不同地震波作用下，，墩梁之间相对位移、梁与梁相对位移随着墩高的变化情况；通过对横向挡块与主梁之间无间隙、有间隙、间隙之间设置弹性缓冲材料等三种不同情况下的动力时程计算结果的比较，得到了横向挡块在地震作用下的受力大小，发现横向挡块对限制墩梁之间的横向相对位移有良好的效果，主梁与横向挡块之间设置缓冲材料时，可以显著减小挡块的受力；对常见的纵向连梁装置，采用不同刚度的弹簧阻尼单元模拟其在地震时的作用，通过动力时程分析，计算比较了设置连梁装置后桥梁地震响应的变化，得到了不同刚度的连梁装置在地震作用下的受力特点。本论文的研究成果将对防落梁装置的设计、工程应用具有一定的参考价值。
[Abstract]:In recent decades, earthquakes occur frequently, and the damage to the building structure, especially the bridge structure, is great. Therefore, it is very necessary to adopt reasonable protection measures for the bridge under earthquake. The damage forms of bridge structure under earthquake are as follows: the damage of superstructure, the damage of supporting connection, the damage of falling beam, the damage of substructure and foundation, the most common of which is the damage of falling beam. The anti-falling beam device is the ultimate protection measure to prevent the bridge superstructure from falling beam damage. The main research in this paper is: combined with the relevant provisions of the existing anti-falling beam system at home and abroad, select the appropriate anti-falling beam device. The effect of anti-falling beam device on the seismic response of bridge structure is analyzed. In this paper, a non-regular seven-span simply supported beam bridge is selected and three seismic waves under different site conditions are used to calculate and compare the relative displacement between pier and beam under different seismic waves through dynamic time-history analysis. The relative displacement of beam to beam varies with the height of pier; The dynamic time history calculation results under three different conditions, such as no clearance, gap between transverse block and main beam, and elastic buffer material between clearance, are compared. The force size of the transverse block under earthquake action is obtained. It is found that the transverse block has a good effect on limiting the lateral relative displacement between the pier beams and the main beam and the transverse block when the buffer material is set. The force of the block can be significantly reduced; The spring damping element with different stiffness is used to simulate the action of the common longitudinal connecting beam device during the earthquake. The dynamic time history analysis is used to calculate and compare the changes of the bridge seismic response after the installation of the connecting beam device. The stress characteristics of the connecting beam device with different stiffness under earthquake action are obtained. The research results of this paper will have some reference value for the design and engineering application of the anti-falling beam device.
【学位授予单位】：重庆交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U441.3

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