行波效应对大跨连续刚构桥易损性影响分析

发布时间：2018-06-21 09:36

本文选题：高墩桥 + 增量动力分析　；参考：《西南交通大学学报》2017年01期

【摘要】：为了分析地震动的行波效应对山区大跨连续刚构桥易损性的影响,以西南地区某高墩大跨连续刚构桥为研究对象,采用谱兼容的方法选取了20条地震记录对桥梁结构进行了一致激励和多点激励下的增量动力分析,并得到其易损性曲线.研究结果表明:墩高越高,桥墩相对位移越大,最高墩的相对位移为矮墩的1.03~2.81倍,但矮墩发生损伤的概率要大于高墩,在抗震设计中应得到重视;与一致激励相比较,考虑行波效应时,矮墩发生轻微损伤和中等损伤的概率降低,高墩发生轻微损伤和中等损伤的概率增大,但行波效应会同时增加矮墩和高墩发生严重损伤的概率,因此在高墩桥的抗震设计中,特别是在高烈度地区,应考虑行波效应对桥梁结构的影响.
[Abstract]:In order to analyze the influence of traveling wave effect of ground motion on the vulnerability of long-span continuous rigid frame bridge in mountainous area, a long-span continuous rigid frame bridge with high piers in southwest China was studied. The incremental dynamic analysis of bridge structure under uniform excitation and multi-point excitation is carried out by using spectral compatible method and 20 seismic records are selected and their vulnerability curves are obtained. The results show that the higher the pier height, the greater the relative displacement of bridge pier. The relative displacement of the highest pier is 1.03or 2.81 times of that of the low pier, but the probability of damage of the pier is greater than that of the high pier. When considering the traveling wave effect, the probability of slight and moderate damage of short pier decreases, while that of high pier increases, but traveling wave effect increases the probability of serious damage of short pier and high pier at the same time. Therefore, the influence of traveling wave effect on bridge structure should be considered in the seismic design of high pier bridge, especially in high intensity area.
【作者单位】：西南交通大学土木工程学院;西南交通大学高速铁路线路工程教育部重点实验室;
【基金】：国家自然科学基金资助项目(51308465,51508473) 中央高校基本科研业务费专项资金科技创新资助项目(SWJTU2014CX037EM) 教育部春晖计划资助项目(Z2014032)
【分类号】：U442.55;U448.23

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