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润扬大桥悬索桥动力特性分析与实测变异性研究

ISSN号：1000-131X
期刊名称：土木工程学报
时间：0
页码：92-98
分类：U448.25[建筑科学—桥梁与隧道工程;交通运输工程—道路与铁道工程]
作者机构：[1]东南大学土木工程学院,江苏南京210096, [2]东南大学混凝土与预应力混凝土结构教育部重点实验室,江苏南京210096
相关基金：国家杰出青年基金（50725828）、国家科技支撑计划重点项目（2006BAJ03805）、国家自然科学基金项目（50978056）、东南大学优秀博士学位论文基金
相关项目：大跨度斜拉桥风致灾变过程的多尺度分析与预测研究

关键词：悬索桥, 动力特性, 中央扣, 边界敏感性, 伸缩缝, 环境振动测试, 结构健康监测系统, suspension bridge , dynamic characteristisc , central nodes , boundary sensitivity , expansion joints , ambient vibration test, structural health monitoring system

中文摘要：

对我国首座采用刚性中央扣代替短吊索设计的润扬大桥悬索桥进行了动力特性分析与实测变异性研究。首先，通过建立三维空间有限元模型，计算了30种不同伸缩缝刚度下的动力特性参数，研究了悬索桥动力特性的边界敏感性；其次，对基于环境激励的桥面模态试验分析结果以及结构健康监测系统获取的不同时期动力特性参数进行了分析，重点研究了通车前后动力特性参数的变异性，指出了部分振型白振频率发生较大变化的原因。研究结果表明：悬索桥动力特性具有较强的边界敏感性，伸缩缝刚度的变化能够引起部分动力特性参数发生较大的变化。设置中央扣后悬索桥一阶反对称振型自振频率边界敏感性增大。在对悬索桥的动力特性进行精确分析时，主梁两端边界条件不容忽视。研究成果对同类大跨度悬索桥的设计和安全评估具有重要的参考价值。

英文摘要：

The Runyang suspension bride is the first suspension bridge with central nodes instead of short cables in China. The behaviors of the bridge were analyzed by using theoretical and experimental methods. A three-dimensional finite element model considering different stiffness of expansion joints at the deck end was presented. Modal parameters under 30 different cases were obtained by using the three-dimensional element model, with the focus on the boundary sensitivity. The dynamic parameters of the bridge at different times obtained by ambient vibration tests and structural health monitoring system were compared. More attention was given to the measured modal parameters before and after the bridge opened to traffic. The results show that some of the modal frequencies changed significantly. The boundary conditions, such as the stiffness of the expansion joints, were found to have a significant influence on the dynamic behaviors of the suspension bridge. The first asymmetric modal frequency of the suspension bridge with central nodes was more sensitive to boundary condition than the bridge without central nodes.

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