大跨径钢管混凝土拱桥自振特性分析与动载试验

Self-vibration Characteristic Analysis and Dynamic Load Test of Long-Span Steel-Tube Concrete Arched Bridge

桥梁结构的自振特性是结构动力分析和抗震分析的重要参数。本文通过建立有限元模型进行模态分析和动载试验,以获得大跨径钢管混凝土拱桥的计算和实测自振特性,测得了桥梁的自振频率、振型和阻尼比,并对实桥测试结果和计算结果进行分析比较,得到横塘港大桥主桥在动力荷载下的实际工作状态,以此判断该桥整体结构的安全承载能力和使用条件。

The self-vibration characteristic of bridge structure is the important parameter for the structural dynamic analysis and the anti-earthquake analysis.The article achieves the calculation and measured self-vibration characteristic of Long-Span Steel-Tube concrete arched bridge by setting up the finite element model to carry out the modal analysis and the dynamic load test analysis,and the self-vibration frequency,the vibration type and relative damping ratio are measured.The article analyzes and compares the test result and the calculating result of the bridge to get the practical working status of this bridge under the dynamic load for finding out the safe bearing capacity and using condition of the whole bridge structure.