朝阳市东大桥动力特性分析

Dynamic Characteristics of the East Bridge in Chaoyang City,Liaoning Province

通过对朝阳市东大桥建立有限元模型和试验模态分析来获得钢管混凝土拱桥的计算和实测自振特性参数。将实桥测试结果和计算分析结果进行了比较,并且获得了大桥的固有频率、模态、阻尼比和冲击系数。了解该桥在动力荷载下的实际工作状态,判断该桥整体结构的安全承载能力和使用条件。

The natural vibration parameters for the concrete-filled steel tubular arch bridge of the East Bridge in Chaoyang City were obtained by means of the finite element model and the experimental modal analysis. The inherent frequency, mode, damp ratio and impact coefficient of the bridge were achieved by comparing the actual test results with the calculation resuits. The safety load-carrying ability and the using conditions of the whole structure of the bridge could be estimated according to its actual working conditions under dynamic load.