| 随机地震激励下高墩桥梁碰撞可靠度分析 |
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| 引用本文： | 贾宏宇,杜修力,罗楠,张金,郑史雄,张克跃.随机地震激励下高墩桥梁碰撞可靠度分析[J].西南交通大学学报,2018,53(1):88-94. |
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| 作者姓名： | 贾宏宇 杜修力 罗楠 张金 郑史雄 张克跃 |
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| 作者单位： | 北京工业大学城市与工程安全减灾教育部重点实验室;西南交通大学土木工程学院; |
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| 基金项目： | 中国博士后基金资助项目2015M580031国家自然科学基金资助项目51308465 |
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| 摘 要： | 为了研究不同地震动强度作用下高墩桥梁的碰撞可靠度的不同，在频域范围内提出了一种以虚拟激励法为基础的动力可靠度计算方法，依托某高墩大跨度桥梁为工程背景，分析了高墩桥梁在不同地震强度下的碰撞可靠度.选择反应谱的水平加速度作为地震强度衡量指标，且将不同强度指标的反应谱转化为相应的功率谱；利用虚拟激励法求解随机振动方程，得到结构响应的均值与均方差值，再基于Davenport理论获得结构峰值响应的期望和标准差；根据首次超越理论计算梁体碰撞可靠度.研究表明:地震动加速度小于0.22g时，梁体之间不发生碰撞，动力可靠度为1.0；加速度大于0.22g时，梁体碰撞动力可靠度下降明显，即在强震作用下，梁体发生碰撞.
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| 关 键 词： | 高墩桥梁 动力可靠度 碰撞间隙 随机地震激励 虚拟激励法 |
| 收稿时间： | 2016-05-03 |
Dynamic Reliability Analysis on Pounding of High-Pier Bridges Subjected to Stochastic Seismic Excitations |
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| JIA Hongyu,DU Xiuli,LUO Nan,ZHANG Jin,ZHENG Shixiong,ZHANG Keyue.Dynamic Reliability Analysis on Pounding of High-Pier Bridges Subjected to Stochastic Seismic Excitations[J].Journal of Southwest Jiaotong University,2018,53(1):88-94. |
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| Authors: | JIA Hongyu DU Xiuli LUO Nan ZHANG Jin ZHENG Shixiong ZHANG Keyue |
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| Abstract: | A dynamic reliability analysis based on the pseudo-excitation method in the frequency domain was proposed to investigate the pounding reliability of high-pier bridges subjected to seismic excitations with different ground motion intensity levels. A high-pier bridge was selected as the numerical example and the pounding reliability of the high-pier bridge was computed for each ground motion intensity level. The horizontal acceleration response spectrum was chosen as the seismic intensity measure and the response spectra for different intensity measures were converted into the corresponding power spectra. Next, the stochastic vibration equation was solved using the pseudo-excitation method to determine the mean and mean square deviation of the structural dynamic responses. The expected values and standard deviation of the structural peak responses were obtained using Davenport's theory. Finally, the pounding reliability between the adjacent beams of the high-pier bridge was determined using the first passage theory. The results indicate that pounding will not occur between the adjacent decks and the pounding reliability is 1.0 when the ground acceleration is less than 0.22g. In addition, there is an obvious decrease in the pounding reliability such that the structure collides under the strong ground motions when the ground acceleration is more than 0.22g. |
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