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Field measurement and validation of structural dynamic parameters of skyscrapers under super typhoon excitation
Journal of Civil Structural Health Monitoring ( IF 3.6 ) Pub Date : 2021-02-02 , DOI: 10.1007/s13349-021-00470-3
Xiao Li , Xiaoye Yu , Q. S. Li , Andrew Allsop

This paper analyzes the field measurement data of wind-excited vibration responses of two skyscrapers (393 and 432 m in height) during Super Typhoon Mangkhut (1822), and utilizes such measurement data to validate the design parameters adopted in both buildings. In this paper, the structural accelerations of the two monitored skyscrapers measured during Mangkhut are presented. Based on the measured acceleration data, building modal parameters, including natural frequencies and damping ratio, are identified and they generally agree with the predicted values by the finite element modelling (FEM) or are within the expectation of their assumed values at the design stage. Furthermore, the amplitude dependencies of the parameters are estimated by the random decrement technique, and the results show that the fundamental frequencies slightly decrease with the vibration amplitude, which may be attributed to the P-Delta effect according to the similar trend revealed by the FEM results, whereas no evident varying trend of damping ratios is demonstrated. The study also identifies the beating effect existing in the monitored building response signals, investigates its impact on modal parameter identification and discusses the correlation between the beating effect and the structural modal characteristics. Finally, the root-mean-square structural accelerations of one of the two buildings are re-calculated based on the wind tunnel test data and the measured building modal parameters, and their comparison with the in situ measurements demonstrates a reasonable agreement.



中文翻译:

超强台风激励下摩天大楼结构动力参数的实测与验证。

本文分析了超级台风山竹(1822)期间两座摩天大楼(高393和432 m)的风振响应现场测量数据,并利用这些测量数据验证了两座建筑物采用的设计参数。在本文中,介绍了在Mangkhut期间测量的两个受监视摩天大楼的结构加速度。基于测得的加速度数据,可以识别出建筑模态参数,包括固有频率和阻尼比,并且通常与有限元建模(FEM)的预测值相符,或者在设计阶段就位于其假定值的预期范围内。此外,参数的幅度相关性是通过随机减量技术估算的,结果表明,基频随振动幅度的增加而略有下降,这可能是由于有限元分析结果所揭示的相似趋势,而归因于P-Delta效应,而阻尼比没有明显的变化趋势。该研究还确定了所监视的建筑物响应信号中存在的跳动效果,研究了其对模态参数识别的影响,并讨论了跳动效果与结构模态特征之间的相关性。最后,根据风洞试验数据和测得的建筑物模态参数,重新计算了两座建筑物之一的均方根结构加速度,并将它们与现场测量结果进行比较表明了合理的一致性。根据有限元分析结果揭示的相似趋势,这可能归因于P-Delta效应,而阻尼比没有明显变化的趋势。该研究还确定了所监视的建筑物响应信号中存在的跳动效果,研究了其对模态参数识别的影响,并讨论了跳动效果与结构模态特征之间的相关性。最后,根据风洞试验数据和测得的建筑物模态参数,重新计算了两座建筑物之一的均方根结构加速度,并将它们与现场测量结果进行比较表明了合理的一致性。根据有限元分析结果揭示的相似趋势,这可能归因于P-Delta效应,而阻尼比没有明显变化的趋势。该研究还确定了所监视的建筑物响应信号中存在的跳动效果,研究了其对模态参数识别的影响,并讨论了跳动效果与结构模态特征之间的相关性。最后,根据风洞试验数据和测得的建筑物模态参数,重新计算了两座建筑物之一的均方根结构加速度,并将它们与现场测量结果进行比较表明了合理的一致性。该研究还确定了所监视的建筑物响应信号中存在的跳动效果,研究了其对模态参数识别的影响,并讨论了跳动效果与结构模态特征之间的相关性。最后,根据风洞试验数据和测得的建筑物模态参数,重新计算了两座建筑物之一的均方根结构加速度,并将它们与现场测量结果进行比较表明了合理的一致性。该研究还确定了所监视的建筑物响应信号中存在的跳动效果,研究了其对模态参数识别的影响,并讨论了跳动效果与结构模态特征之间的相关性。最后,根据风洞试验数据和测得的建筑物模态参数,重新计算了两座建筑物之一的均方根结构加速度,并将它们与现场测量结果进行比较表明了合理的一致性。

更新日期:2021-02-02
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