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Sensitivity Analysis of the Lateral Damping of Bridges for Low Levels of Vibration

机译：低水平振动桥梁侧向阻尼的敏感性分析

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摘要

Damping is a dynamic property that has not been fully understood. In particular, damping in bridges requires further study in order to gain a better understanding of the parameters that define its value and variation. In practice a constant ratio of 5% of the critical damping is commonly used in seismic analysis and design. However, this may not be accurate for different levels of shaking. In addition, the experimental methods to estimate damping can provide different damping ratios for the same structure, which increases the uncertainties on the damping estimates. This paper presents a sensitivity analysis of the damping in bridges for different types of excitation and low levels of vibration. Data collected from different sources is used to conduct the assessment, namely, scaled model tests, ambient vibration tests, and seismic ground motions from instrumented bridges in California. A discussion of the results using several frequency and time domain methods for damping estimation is presented.
机译：阻尼是一种没有完全理解的动态特性。特别地，在桥梁中阻尼需要进一步研究，以便更好地理解定义其值和变化的参数。实际上，恒定比率的恒定比率通常用于地震分析和设计。然而，这可能不准确地用于不同的震动。另外，估计阻尼的实验方法可以为相同的结构提供不同的阻尼比，这增加了阻尼估计的不确定性。本文介绍了不同类型的激发和振动水平的桥梁中阻尼的灵敏度分析。从不同来源收集的数据用于进行评估，即缩放的模型测试，环境振动试验，以及来自加利福尼亚州仪器的桥梁的抗震地面运动。介绍了使用若干频率和时域方法进行阻尼估计的结果的讨论。

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