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Modal Parameter Identification under Ambient Excitation and Their Effects on Wind-induced Response of Tall Buildings

Author: YangXiong
Tutor: WuJiuRong
School: Guangzhou University
Course: Structural Engineering
Keywords: Modal parameter identification Prototype measured Typhoon characteristics Wind effect Time history analysis
CLC: TU973.2
Type: Master's thesis
Year: 2011
Downloads: 50
Quote: 0
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Abstract


With the development of science and technology and construction technology, the city began to emerge of a group of ultra-high-rise buildings, such as Guangzhou West Tower (432 m), Taipei 101 (508 m), Shanghai Center Building (632 m). This paper mainly before two high-rise buildings as the engineering background, according to the Guangzhou West Tower high-rise buildings typhoon wind field characteristics and wind-induced structural vibration measured data and the Taipei 101 wind induced structural vibration and seismic vibration measured data, its wind field characteristics of the Guangzhou West Tower, structure modal parameter identification of wind-induced vibration and Taipei 101 analysis and research, the main contents include the following aspects: (1) Taipei 101 engineering background, according to the structural vibration field measurement data, including the role of several typhoons and earthquakes measured data under stochastic subspace identification method (SSI) and the strengthening of the frequency domain decomposition method (EFDD) modal parameter identification of the Taipei 101 building in different load cases, identify the Taipei 101 building in different load first six natural frequencies, mode shapes, structural damping ratio, analysis SSI three different projection matrix weighted algorithm (SSI-UPC, SSI-PC and SSI-CVA) similarities and differences. The results show that: SSI three algorithms results very close to the PC algorithm to identify the highest accuracy. Discussed the application of the SSI identification methods, the projection channel technology, the stability diagram state space dimension, typhoon strength, load types modal recognition accuracy. Modal identification in application EFDD identification method to analyze the frequency resolution of recognition accuracy. The results show that: the above-mentioned factors have a greater impact on modal identification accuracy. (2) Guangzhou West Tower, for example, under the influence of the typhoon \The results verify the turbulence intensity with the average wind speed decreases with the turbulence intensity, gust factor increases law and measured downwind to cross wind pulsating wind speed spectrum are in line with the Von Karman spectrum. Under Typhoon floors at the top of the acceleration data analysis, results show that the modal parameters of the structure of the test results and finite element analysis anastomosis. Also analyzed the relationship between the the roof mean wind speed and the acceleration rms responding. Its dynamic characteristics (frequency and damping ratio) were identified by random decrement method to obtain the structure of the two spindle direction modes corresponding damping ratio and the amplitude of the non-linear relationship, and results show that the damping ratio characteristic increases with the amplitude increases. The measured results for the high-rise building design and research reference. (3) is still Guangzhou West Tower, for example, through its three-dimensional finite element model of simplified lumped mass \wind-induced power analysis, preparation of its program with the Matlab7.0. Japan and Europe and the United States on the statistical results of the existing large building measured damping nonlinear damping model discussed the different inherent damping model structure (the ordinary damping and nonlinear damping model) and aerodynamic damping model of its wind-induced power schedule Analysis of the impact. The results show that: the different damping model conditions, wind-induced power analysis to obtain the results were different, but still belongs to the acceptable range. Integration method results comparable with the results of wind tunnel tests, the wind-tunnel tests and theoretical analysis results with high reliability.

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CLC: > Industrial Technology > Building Science > High-rise buildings > Tall Building Structures > Structural Analysis and Calculation
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