基于实测数据的某高层建筑结构动力参数和气动阻尼识别

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振动与冲击 ›› 2017, Vol. 36 ›› Issue (10) : 31-37.

论文

黄铭枫1，吴承卉1，徐卿1，张凤亮2，楼文娟1

作者信息 +

Structural dynamic and aerodynamic parameter identification for a tall building with full-scale measurements

HUANG Ming-feng1, WU Cheng-hui1, XU Qing1, ZHANG Fengliang2, LOU Wen-juan1

Author information +

文章历史 +

摘要

根据在北冕台风及汶川远震作用下某270米高大楼顶层实测得到的加速度响应数据，对该高楼的结构动力参数和气动阻尼进行了识别。采用两种方法识别得到了该大楼的模态振动频率和阻尼比参数。一是经验模态分解(EMD)结合随机减量法(RDT)及希尔伯特黄变换法(简称EMD+RDT)，另外采用了基于贝叶斯理论和快速傅里叶变换的识别方法。利用EMD+RDT法，还得到了阻尼比随加速度幅值的变化规律。两种方法识别得到了非常一致的模态振动频率结果。而在台风作用和地震作用下所识别的大楼阻尼比特性却表现出明显不同的特性和规律。这种不同主要是由于在台风作用下的建筑物阻尼包含了气动阻尼成分。如果把地震作用下识别得到的该高楼阻尼比作为结构阻尼比，台风条件下识别得出的阻尼比为总阻尼比，则二者相减可以作为该楼气动阻尼比的估计。

Abstract

Full-scale measurements have been conducted for a 270-m tall building in Hong Kong. Acceleration response data of the tall building has been collected during Typhoon Kammuri and 512 Wenchuanearthquake in 2008. Based on two sets of acceleration data, dynamic modal properties of the tall building were identified by two methods. One is the traditional method of empirical mode decomposition (EMD) combined with the Random decrement Technique (RDT), the other is the recently proposed Fast Bayesian method using the fast Fourier transform (FFT). The natural frequency of each mode identified by these two different methods is very close to each other. Noticeable differences are observed for damping ratio results associated with each mode. The identified results can also be compared between two excitation events. As expected, wind-induced acceleration data suggests almost the same frequency values compared to the results identified from the acceleration data due to the long-distance earthquake. However, the damping ratios corresponding to Wenchuan earthquake were found to be larger than the damping results of the tall building under typhoon excitation. The difference of two sets of damping ratio results might be attributed to the the role of aerodynamic damping, which could be estimated from the two sets of damping ratio.

导出引用

黄铭枫1，吴承卉1，徐卿1，张凤亮2，楼文娟1. 基于实测数据的某高层建筑结构动力参数和气动阻尼识别[J]. 振动与冲击, 2017, 36(10): 31-37

HUANG Ming-feng1, WU Cheng-hui1, XU Qing1, ZHANG Fengliang2, LOU Wen-juan1. Structural dynamic and aerodynamic parameter identification for a tall building with full-scale measurements[J]. Journal of Vibration and Shock, 2017, 36(10): 31-37

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