既有桥墩动力特性分析及其状态评估  

Dynamic Characteristic Analysis and Performance Evaluation of the Existing Piers

作　　者：刘保东[1] 刘汉夫[2] 

机构地区：[1]北京交通大学土木建筑工程学院,北京100044 [2]铁道科学研究院铁道建筑研究所,北京100081

出　　处：《公路交通科技》2006年第6期95-97,共3页Journal of Highway and Transportation Research and Development

基　　金：交通部西部交通科技资助项目(200431800058)

摘　　要：桥墩在使用荷载和环境因素的综合影响下,其实际状态会随时间发生一定程度的改变,造成桥墩动力特性的变化。基于对实际既有桥墩现状的调查和分析,按照相关规范的规定,用有限元方法建模计算了桥墩基于现状的完整、健康状态下的自振频率,并应用自然脉动法现场实际测量了桥墩的自振频率。通过计算频率与实测频率的对比,应用健全度指标法对桥墩进行了状态评估。计算和分析结果表明,文章提出的计算和评估方法是合理的,评估结果反应既有桥墩的实际状态,可以为采取相应的措施提供有价值的参考。Under the influence of the load and the environment, the performance of the piers is varying during its service life. Thereby the dynamic characteristics of the piers are changed. Based on the investigation and analysis of the actual state of some existing piers, the Finite Element models are established according to the relative standards and the frequencies of the present undamaged piers are calculated. Comparing with the actual ~med data derived by the natural pulsating method, the performance of the existing piers is evaluated by Healthiness Index Method. The calculated and analytical results show that the proposed calculation and evaluation methods are rational and feasible. The evaluation results show the actual performance of the pier and can be a valuable reference for taking required measures.

关 键 词：桥墩 状态评估 振动 动力特性 脉动法 

分 类 号：U443.32[建筑科学—桥梁与隧道工程]