基于灵敏度分析与优化设计原理的大跨桥梁动力模型修正

Updating of Dynamic Model for Long-Span Bridges Based on Structural Sensitivity Analysis and Optimization Design Principle

建立一个满足工程精度要求、反映桥梁力学特性的有限元模型是进行结构健康监测研究的第一步。根据大跨桥梁现场实测的模态数据,采用基于特征灵敏度的优化设计方法对润扬长江大桥斜拉桥进行了模型修正,分析结果为大跨桥梁的结构损伤识别和安全监测工作提供了一定的依据。

The first step to carry out research of structure health monitoring is to set up a finite element model that can both meet the need of engineering precision and represent the mechanical properties of bridges. In accordance with the modal data obtained from field tests of long-span bridges, the original finite element model of the cable-stayed bridge of Runyang Changjiang River Bridge is updated, using the optimization design principle based on the structural sensitivity analysis. The results provide a basis for structural damage identification and safety monitoring of long-span bridges.