不同激励模式下桥梁实测阻尼比差异

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振动与冲击 ›› 2016, Vol. 35 ›› Issue (3) : 62-67.

论文

不同激励模式下桥梁实测阻尼比差异

李湛 1 ，李鹏飞 1，姜震宇 1，韦韩 1

作者信息 +

Difference of Bridge Damping Ratio under Different Excitations

Li Zhan1 Li Pengfei 1 Jiang Zhenyu 1 Wei Han1

Author information +

文章历史 +

摘要

本文收集和分析了国内外学者对结构物阻尼比的实测结果，指出了当前桥梁阻尼比研究成果的局限性。为了弥补当前桥梁阻尼比实测结果匮乏的局限，本文针对三座典型桥梁进行了阻尼比测试，分析了影响桥梁阻尼比的主要因素。本文研究发现：桥梁的阻尼比不是定值，它与桥梁的类型、测试时的激励方式、阻尼比的处理方法、测试环境等有较大的相关性。激励强度越大，测试的阻尼比数值越大。车辆激励作用下的阻尼比数值明显大于环境激励下的阻尼比数值。相同激励模式下，不同的阻尼比处理方法所计算的阻尼比数值差距较大。半功率带宽法计算的阻尼比数值的离散性要大于利用自由衰减法计算的阻尼比。建议桥梁结构阻尼比的测试中需要保证激励的一致性，避免在采样过程中出现激励程度差距较大的激励模式。

Abstract

Data on the damping ratios of structure have been collected and analyzed. The limitations on the research of the bridge damping ratio have been pointed out. In order to make up the limitation of the lack of date on the damping ratios of bridges, three bridges damping ratios are tested. The damping ratios of bridges scatter with the influence of the bridge types, excitations, calculation methods of damping ratio and the test environment. With the increase in excitation intensity, the damping ratios of the bridges increase significantly. The damping ratio tested under vehicle excitation is larger than the value tested under ambient excitation. Under the same excitations, the damping ratio calculated by the half-power bandwidth method is more scattered than which calculated by the free decay method. The test of the bridge damping ratio should be carried out under the same excitations to ensure accuracy.

导出引用

李湛 1,李鹏飞 1，姜震宇 1，韦韩 1. 不同激励模式下桥梁实测阻尼比差异[J]. 振动与冲击, 2016, 35(3): 62-67

Li Zhan1 Li Pengfei 1 Jiang Zhenyu 1 Wei Han1. Difference of Bridge Damping Ratio under Different Excitations[J]. Journal of Vibration and Shock, 2016, 35(3): 62-67

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