桥塔是决定大跨度桥梁结构动力特性的重要部分之一,系统而深入地认识桥塔的动力特性是十分重要的。本文采用环境激励振动测试的方法对润扬桥塔的振动特性进行了测试,识别了其重要的模态参数。为了更深入地了解桥塔的力学性质,建立了桥塔的空间结构模型,依据最小秩方法(MROU),对结构模型进行了修正,识别出桥塔中重要的力学参数。修正后的模型为进一步模拟仿真分析大型桥塔在恶劣环境下的动态响应提供基础。 Pylons are one of the important parts that determine the dynamic characteristics of long-span bridges. It is very important to systematically and deeply understand the dynamic characteristics of Pylons. In this paper, the method of environmental excitation vibration test was used to test the vibration characteristics of Runyang Bridge Tower, and its important modal parameters were identified. In order to know more about the mechanical properties of pylons, a model of pylons’ space structure is established. Based on the minimum rank method (MROU), the structural model is modified to identify the important mechanical parameters of pylons. The revised model provides the foundation for further simulation analysis of the dynamic response of large bridge tower in harsh environment.