某多跨连续隔震坡桥的研究及振动台地震模拟试验

发布时间：2018-01-15 15:45

本文关键词：某多跨连续隔震坡桥的研究及振动台地震模拟试验　出处：《广州大学》2014年硕士论文　论文类型：学位论文

【摘要】：具有战略意义的大型桥梁作为交通枢纽工程同时还会被冠以“生命线工程”的称号。国民经济高速发展的今天伴随着各种大型桥梁工程的建设需求，一旦重要的桥梁在地震灾害中破坏，不仅是巨大的经济损失，更严重影响抗震救灾和灾后重建工作开展。传统的抗震设计对于某些具有战略意义的大型桥梁已不在是最优方案，合理的使用减震、隔震技术是解决这类问题的有效途径。国际上，减，隔震技术在连续桥梁上的运用正在快速推广，我国已建成或在建桥梁中也出现不少这种形式的隔震桥梁。大多数已建成的多跨连续梁隔震桥梁中，桥面与水平面的夹角小，，相邻桥墩高差不大，可视为是“平桥”，而桥面与水平面夹角较大，相邻桥墩高差大的“坡桥”相对较少。本文以某近海桥梁工程为实例，该桥梁工程的连续桥梁部分出现两种特征联，即桥墩高差不大的“平桥”联与桥墩高差较大的“坡桥”联，采用铅芯橡胶隔震支座进行隔震设计。本文对两种桥梁进行时程分析，并对桥墩高差较大的特征联进行振动台地震试验研究，主要研究内容为：（1）利用软件midas Civil建立三维空间有限元计算模型，对坡桥进行隔震设计，地震作用下的动力时程分析。（2）比较隔震与非隔震情况下的内力，加速度响应，分析隔震支座位移与耗能情况，对比隔震坡桥与隔震平桥的内力响应，确定隔震坡桥的内力分布趋势。（3）改变坡桥联相邻桥墩之间的高差和隔震支座的参数，进行罕遇地震下动力时程分析，寻求优化隔震效果方案。（4）对坡桥进行振动台地震模拟试验，研究其动力响应特点，并进行数值模拟验证试验的正确性。
[Abstract]:Large - scale bridges with strategic significance will be awarded the title of " lifeline engineering " as the transportation hub project . Today , the high - speed development of national economy is accompanied by the construction demands of large bridge projects . Once the important bridge is damaged in earthquake disasters , it is not only a huge economic loss , but also affects the earthquake relief and post - disaster reconstruction work . Traditional seismic design is not an optimal scheme for some large bridges with strategic significance , and the rational use of shock absorption and isolation technology is an effective way to solve such problems . In this paper , there are two characteristics of the bridge between the bridge deck and the horizontal plane and the high difference between the two adjacent piers . In this paper , two characteristics of the bridge are considered as " flat bridge " , and the bridge deck has a large included angle with the horizontal plane , and the height difference between the adjacent piers is relatively small . ( 1 ) Using the software midas Civil to establish a three - dimensional finite element calculation model , the dynamic time history analysis of the seismic design and the earthquake action is carried out on the slope bridge . ( 2 ) To compare the internal force and acceleration response of the isolated and non - isolated bridge , to analyze the displacement and energy consumption of the seismic isolation bearing , and to compare the internal force response between the seismic isolation slope bridge and the seismic isolation flat bridge , and to determine the internal force distribution trend of the seismic isolation slope bridge . ( 3 ) To change the height difference between the adjacent piers of the slope bridge and the parameters of the seismic isolation bearing , and to analyze the dynamic time history under the earthquake , and seek to optimize the seismic isolation effect scheme . ( 4 ) The dynamic response characteristics of the slope bridge are studied by shaking table seismic simulation test , and the correctness of the numerical simulation verification test is carried out .

【学位授予单位】：广州大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U442.55

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