基于结构多尺度模拟和分析的大跨斜拉桥应变监测-中国土木科技网.PDF

第 26 卷第 1 期 Vol.26 No.1 工 程 力 学 2009 年 1 月 Jan. 2009 ENGINEERING MECHANICS 142 文章编号：1000-4750(2009)01-0142-07 基于结构多尺度模拟和分析的 大跨斜拉桥应变监测传感器优化布置研究 * 张政华，毕 丹， 李兆霞 (东南大学工程力学系，南京 210096) 摘 要：该文以润扬大桥斜拉桥钢箱梁结构为研究对象，针对结构安全评估为目标的大跨桥梁结构健康监测系统 中应变传感器的优化布置问题，提出了一个基于桥梁结构多尺度模拟和结构响应分析结果进行应变传感器优化布 置的方法。通过斜拉桥脊骨梁模型来研究确定钢箱梁的关键截面，通过子模型方法实现钢箱梁结构的多尺度模拟 和从结构整体到主要局部构件中的应力状态分析，据此进一步分析和确定斜拉桥健康监测系统中钢箱梁结构应变 传感器的安装位置，并用在润扬斜拉桥上进行的静动载试验的测试结果验证了结构整体与局部响应分析结果，从 而间接验证了应变传感器优化布置结果的正确性。 关键词：斜拉桥；钢箱梁；多尺度模拟；优化布置；应变传感器；局部应力分析 中图分类号：TU317; U448.27 文献标识码：A RESEARCH ON OPTIMAL PLACEMENT OF STRAIN SENSORS IN DECK OF CABLE-STAYED BRIDGES BASED ON MULTI-SCALE MODELING AND ANALYSIS * ZHANG Zheng-hua , BI Dan , LI Zhao-xia (Department of Engineering Mechanics, Southeast University, Nanjing 210096, China) Abstract: The key issue on optimal placement of strain sensors inside the steel beam of cable-stayed bridge was studied for the purpose of the safety evaluation using the structural health monitoring system. A novel optimization method base on the analyses of global and local responses of the multi-scale model of the bridge was proposed, and the Runyang cable-stayed bridge was studied to illustrate the application of the optimization method. The simplified model of the bridge was first developed in order to obtain the key sections of the bridge deck; then, the stress distribution in the global structure and local components were presented by the sub-modeling and multi-scale sim