一种基于高精度模态测试的

桥梁构件刚度识别方法

袁红茵    肖晓辉

    （广州市市政园林局，广东省广州市 510060）

摘要： 本文提出了一种利用高精度低阶测试模态对桥梁构件抗弯刚度通过导入最佳参数进行平差的最小二乘解识别方法。通过对一座3跨变截面连续箱梁实桥梁体抗弯刚度结合桥梁现场检测工作及数值模拟计算识别结果表明，此方法对于多种测试误差表现相当稳定，可较好地满足工程精度要求。

关键词： 高精度模态测试 最佳参数平差  构件刚度 识别方法

A Flexural Rigidity Modal Identification Method for Bridge Structural Members Based on High-accuracy Test and Parameter Adjustment

          YUAN Hong-yin,   XIAO Xiao-hui

(Guangzhou Municipal and Garden Bureau)

Abstract：In this paper, a least-squares adjustment method with finite power indirect and optimal parameter for mean error for flexural rigidity identification for bridge structural members is developed by using lower measured accurate modes. Also a numerical example of three-span continuous beam is analyzed in order to identify the flexural rigidity of structures and to verify the sensitivity of measured errors. The analyzed result shows that the method can be satisfied for engineering requirements.

keywords：high-accuracy modal test, optimal parameter for mean error, member rigidity, identification method