大跨公铁两用斜拉桥减震装置参数优化研究及抗震性能评估

发布时间：2018-08-22 15:51

【摘要】：大跨公铁两用斜拉桥因其可以使得公路和铁路共用桥位、节约资源而得到广泛应用。大跨公铁两用斜拉桥一般连接跨海通道或位于高速铁路的线路上。其一旦在地震下受到破坏,将会给人民的生命财产带来不可估量的损失。因此,对于大跨公铁两用斜拉桥的减震措施研究显得十分重要。大跨公铁两用斜拉桥的主梁布置形式主要有以下三种:公路和铁路分层布置,平层布置,错层布置。目前,国内外对主梁分层布置的减震措施做过一些研究,但是对于主梁平层和错层布置的减震措施研究较少,且大部分研究多停留在对大跨公铁两用斜拉桥地震作用下的反应上,对减震阻尼器参数优化的研究较少。因此,本文对大跨公铁两用斜拉桥的错层布置的减震措施研究和阻尼器参数优化研究显得十分重要。以某主跨522m大跨公铁两用斜拉桥为工程背景,参考其设计图纸,建立了该大跨公铁两用斜拉桥的空间动力有限元模型。研究主要内容包括:(1)建立了大跨公铁两用斜拉桥的空间弹性动力计算模型,比较分析了纵向四种约束体系下的动力特性、内力和位移,得到了纵向最适合的抗震体系。(2)根据设计图纸支座及桥墩布置方式,以纵向半漂浮体系为例,研究了结构在设计地震作用(50年超越概率10%)输入下的纵向地震响应随粘滞阻尼器参数变化的规律以及横向地震响应随E型钢阻尼器参数的变化规律。为同类大跨公铁两用斜拉桥阻尼器参数设置提供了参考。(3)采用模糊逻辑理论和MATLAB内置的模糊器对阻尼器的参数进行优化,优选出一组综合减震性能最高的阻尼器参数。找到了一种阻尼器优化快速有效的方法。(4)研究大跨公铁两用斜拉桥在阻尼器参数优化后的地震响应和抗震性能,检验阻尼器的工作效果。
[Abstract]:Long-span cable-stayed bridges are widely used because they can make highways and railways share bridge sites and save resources. Long-span cable-stayed bridges are usually connected to sea-crossing passages or located on high-speed railway lines. Once damaged under the earthquake, they will bring immeasurable losses to people's lives and property. The main girder layout of long-span cable-stayed bridges is mainly divided into three types: layered layout of highway and railway, layered layout, staggered layout. At present, some research has been done on the seismic mitigation measures of the layered layout of the main girder at home and abroad, but for the layered and staggered layout of the main girder. There are few studies on seismic mitigation measures and most of the researches are mainly on the response of long-span cable-stayed bridges under earthquake, and few on the optimization of damper parameters.Therefore, it is very important to study the seismic mitigation measures and the optimization of damper parameters for staggered layers of long-span cable-stayed bridges. Based on the design drawings of 522m long-span cable-stayed bridge, the spatial dynamic finite element model of the long-span cable-stayed bridge is established. (2) Based on the design drawings and the arrangement of the piers, taking the longitudinal semi-floating system as an example, the variation of the longitudinal seismic response with the parameters of viscous dampers and the transverse seismic response with the E-shape of the structure under the input of the design earthquake action (50-year probability of exceeding 10%) are studied. (3) The parameters of the damper are optimized by using the fuzzy logic theory and the built-in fuzzy controller in MATLAB, and a group of damper parameters with the highest comprehensive damping performance are selected. Methods. (4) The seismic response and seismic performance of long-span cable-stayed bridges with high-speed rail and highway are studied after the parameters of dampers are optimized.
【学位授予单位】：西南交通大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U442.55;U448.27

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