基于IDA-PSDA的路堤震害易损性评价

发布时间：2018-01-26 13:42

本文关键词： 道路工程路堤增量动力分析震害易损性概率性地震需求分析挡土墙　出处：《中国公路学报》2017年05期 　论文类型：期刊论文

【摘要】：为了研究路堤在地震作用下的易损性特点和挡土墙对路堤震害易损性的影响,选取连云港—霍尔果斯高速公路西安—宝鸡段K1125+470处路堤进行理论性震害易损性评价。通过划分路堤震害等级,选取路堤震害损伤参数,建立了路堤震害等级与路堤震害损伤参数之间的对应关系;采用Flac软件建立了无挡土墙和有挡土墙路堤的有限差分模型,选取实际记录地震动进行了增量动力分析,明确了一定地震动峰值加速度作用下无挡土墙和有挡土墙路堤震害损伤参数的取值规律;采用概率性地震需求分析方法研究了路堤发生各等级震害的概率,绘制了路堤震害易损性曲线,并将无挡土墙和有挡土墙路堤的震害易损性评价结果进行对比。研究结果表明:地震动峰值加速度为1.2g时,无挡土墙和有挡土墙路堤发生毁坏的概率比地震动峰值加速度为1.0g时平均高16.854%和76.679%,比地震动峰值加速度为0.8g时平均高95.895%和88.008%,即无论有无挡土墙,地震动峰值加速度越大,路堤发生更严重等级震害的概率越大;超越概率为30%、50%和80%时,有挡土墙路堤发生毁坏时对应的地震动峰值加速度比无挡土墙路堤平均高17.93%、18.14%和18.34%,即在相同地震作用下,有挡土墙路堤的震害状况低于无挡土墙路堤,说明挡土墙对提高路堤抗震性能具有积极作用。
[Abstract]:In order to study the vulnerability characteristics of embankment under earthquake and the influence of retaining wall on the vulnerability of embankment to earthquake damage. Selecting the embankment of Xian-Baoji section of Lianyungang-Horgoz Expressway to evaluate the theoretical damage vulnerability of the embankment, and selecting the damage parameters of the embankment by dividing the grade of the damage. The corresponding relationship between the damage grade of embankment and the damage parameter of embankment is established. The finite difference model of unretaining wall and embankment with retaining wall is established by using Flac software, and the incremental dynamic analysis is carried out by selecting the actual recorded ground motion. The damage parameters of embankment without retaining wall and embankment with retaining wall under the action of peak acceleration of ground motion are determined. The probabilistic seismic demand analysis method is used to study the probability of earthquake damage of embankment, and the vulnerability curve of embankment earthquake damage is drawn. The results of seismic vulnerability evaluation of unretaining wall and embankment with retaining wall are compared. The results show that the peak acceleration of ground motion is 1.2 g. The probability of breakage of unretaining wall and embankment with retaining wall is 16.854% and 76.679% higher than that when peak acceleration of ground motion is 1.0 g. The average acceleration is 95.895% and 88.008 higher than the peak acceleration of ground motion when the peak acceleration is 0.8 g, that is, the higher the peak acceleration of ground motion is, whether there is a retaining wall or not. The more serious earthquake damage occurred in embankment, the greater the probability of earthquake damage. When the probability of surpassing is 30% and 80%, the peak acceleration of the ground motion corresponding to the breakage of the embankment with retaining wall is 17.93% higher than that of the embankment without retaining wall. The earthquake damage of embankment with retaining wall is lower than that of unretaining embankment under the same earthquake action, which indicates that retaining wall has positive effect on improving seismic performance of embankment.
【作者单位】：山东理工大学建筑工程学院;长安大学特殊地区公路工程教育部重点实验室;山东理工大学交通与车辆工程学院;
【基金】：山东省自然科学基金项目(2015ZRB019JS) 山东省中青年科学家奖励基金项目(BS2015SF016) 山东理工大学博士科研启动基金项目(415046)
【分类号】：U416.12
【正文快照】： 0引言地震是危及人民生命财产安全的突发式自然灾害。在中国唐山、汶川、玉树以及日本阪神、新o_等历次大地震中,路堤普遍遭受了不同程度的损害,严重影响了震区公路系统对抢险救灾的保障作用,甚至成为关系到抗震救灾工作全局的“死结”[1]。本文将路堤震害易损性定义为一定强

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