Abstract

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Title:: Modal Parameter Identification of Ping’an Financial Center in Shenzhen Under Ambient Wind Excitation

Author(s):: LI Qiu-sheng; HAN Xu-liang; HE Yun-cheng; HE Ying-hou; ZHOU Kang; College of Civil Engineering, Hunan University

Keywords:: super high-0rise building; wind-induced response; field measurement; empirical mode decomposition; random decrement technique; modal parameter

Abstract:: The 600 m height super high-rise building of Ping’an Financial Center (PAFC) in Shenzhen was field measured under external ambient wind excitation. The wind-induced acceleration responses of the structure were measured by the two groups of acceleration sensors installed on the 118th floor. The natural frequency and damping ratio of the structure were calculated by combining empirical mode decomposition (EMD) and random decrement technique (RDT). The three-dimensional finite element model of Ping’an Financial Center in Shenzhen was established, and the natural frequency of the structure was obtained by finite element analysis. The results show that using EMD and RDT combination method, the first-order transverse natural vibration frequency is about 0.12 Hz, the damping ratio is 0.3%-0.6%; the first-order torsional natural vibration frequency is about 0.28 Hz, the damping ratio is 0.8%-1.0%. The measuring natural vibration frequency and damping ratio of Ping’an Financial Center in Shenzhen are close to other similar high-rise structures, and the measured results are in good agreement with the finite element analysis results, which verifies the effectiveness of EMD and RDT combination method to analyze high-rise building modal parameters.The measured results can provide the basis for the design of super high-rise building and related research.