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Reliability analysis of damping estimation by random decrement technique for high-rise buildings

机译：高层建筑随机减量技术阻尼估计可靠性分析

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摘要

Damping ratio is one of the most important parameters in the dynamic analysis of high-rise buildings for structural design. As a practical damping estimation method, the random decrement technique (RDT) has been widely applied to civil structures in the past decades. The inherent limitation of the RDT is that it can only provide a single optimal damping result, while the reliability of its estimated result is unavailable. By combining the RDT with the bootstrap method, this paper presents a reliability analysis scheme for damping estimation. Based on the bootstrap-based scheme, the reliability of damping results estimated by the RDT using four commonly used triggering conditions is systemically investigated through numerical simulations. The results show that the reliability of damping estimates can be effectively evaluated by providing the confidence interval. Moreover, based on free vibration test results and field measurements of acceleration responses of a 600-m high skyscraper during a typhoon, the bootstrap-based scheme is further verified to be applicable and effective for evaluating the reliability of damping results of high-rise buildings in field measurements. This paper aims to provide useful implications for evaluating the reliability of damping estimates and thereby improve the accuracy of damping evaluation of high-rise buildings.
机译：阻尼比是结构设计高层建筑动力学分析中最重要的参数之一。作为一种实用的阻尼估计方法，随机减量技术（RDT）在过去几十年中已被广泛应用于民用结构。 RDT的固有限制是它只能提供单个最佳阻尼结果，而其估计结果的可靠性是不可用的。通过将RDT与引导方法组合来，本文介绍了用于阻尼估计的可靠性分析方案。基于基于引导的方案，通过数值模拟系统地研究了RDT的阻尼结果的可靠性，通过数值模拟来系统地研究了常用的触发条件。结果表明，通过提供置信区间，可以有效地评估阻尼估计的可靠性。此外，在台风期间，基于自由振动试验结果和励磁响应的励磁响应的现场测量，进一步验证了基于自由的方案，以适用于评估高层建筑的阻尼结果的可靠性在现场测量中。本文旨在为评估阻尼估计的可靠性提供有用的影响，从而提高了高层建筑的阻尼评估的准确性。

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