下承式钢管混凝土拱桥自振特性的有限元分析

Finite Element Analysis on Through Concrete-filled Steel-tabular Arch Bridge's Self-vibration Characteristics

利用ANSYS有限元通用软件,对一座下承式钢管混凝土拱桥进行了有限元模拟研究,求出了自振频率、振型等动力参数,对其振型特征进行了分析,并通过变换拱桥的主要结构参数分析了它们对自振特性的影响。桥梁实例分析说明采用有限元计算的自振特性数值和实测值较相近,能够基本反映结构的实际状况,还可为桥梁使用过程中的健康检测和维护提供基础性数据。

A through concrete-filled steel-tabular arch bridge was simulated by using ANSYS. Dynamic parameters such as self-vibration frequencies and modes were deduced, and the modes characteristics were analyzed. Furthermore, the influence of self-vibration characteristic when primary structural parameters changed was discussed. The analysis of bridge examples illuminated that self-vibration characteristic which was calculated by finite element is near to the experimental datum, and could reflect structural actual status basically. It could offer basic datum to health inspection and maintenance during the use of bridge.