【摘要】 对桥梁开展环境振动测试，可以获得桥梁的模态参数如固有振型、自振频率以及阻尼比。桥梁性能评定、损伤识别、健康检测和基准有限元模型建立以这些参数为主要依据。将实测的加速度数据进行模态分析，获得桥梁的自振频率和振型，并与有限元模型理论计算结果进行对比分析，结果表明：通过试验得到的桥梁实际自振特性与有限元模型理论计算结果吻合良好，为以后桥梁定期检测、状态评估和日常养护提供基准参数。文章内容可为同类型桥梁提供参考。更多还原

【Abstract】 The environmental vibration test of the bridge can obtain the dynamic(modal) parameters of the bridge structure such as natural vibration frequency, damping ratio and natural vibration mode.These parameters are the base of bridge damage identification, performance evaluation, health inspection and benchmark finite element construction.The measured acceleration signal is subjected to modal analysis to obtain the natural frequency and vibration mode of each step of the bridge structure.The test data is collated and analyzed, and the finite element calculation results are analyzed and compared to understand the actual dynamic characteristics of the structure, which can provide benchmark parameters for bridge maintenance, state assessment and health detection in the future.更多还原