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ZJUS-A
Journal of Zhejiang University-SCIENCE A (Applied Physics & Engineering)  2012, Vol. 13 Issue (2): 91-104    DOI: 10.1631/jzus.A1100177
Mechanics and Mechanical Engineering     
Digital simulation of 3D turbulence wind field of Sutong Bridge based on measured wind spectra
Hao Wang, Zhou-hong Zong, Ai-qun Li, Teng Tong, Jie Niu, Wen-ping Deng
Key Laboratory of Concrete and Prestressed Concrete Structures of Ministry of Education, Southeast University, Nanjing 210096, China; Key Laboratory of Environmental Impact and Structural Safety in Engineering, China University of Mining & Technology, Xuzhou 221116, China
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Abstract  Time domain analysis is an essential implement to study the buffeting behavior of long-span bridges for it can consider the non-linear effect which is significant in long-span bridges. The prerequisite of time domain analysis is the accurate description of 3D turbulence winds. In this paper, some hypotheses for simplifying the 3D turbulence simulation of long-span cable-stayed bridges are conducted, considering the structural characteristics. The turbulence wind which is a 3D multivariate stochastic vector process is converted into four independent 1D univariate stochastic processes. Based on recorded wind data from structural health monitoring system (SHMS) of the Sutong Bridge, China, the measured spectra expressions are then presented using the nonlinear least-squares fitting method. Turbulence winds at the Sutong Bridge site are simulated based on the spectral representation method and the Fast Fourier transform (FFT) technique, and the relevant results derived from target spectra including measured spectra and recommended spectra are compared. The reliability and accuracy of the presented turbulence simulation method are validated through comparisons between simulated and target spectra (measured and recommended spectra). The obtained turbulence simulations can not only serve further analysis of the buffeting behavior of the Sutong Bridge, but references for structural anti-wind design in adjacent regions.

Key words： Turbulence simulation      Spectral representation method      Fast Fourier transform (FFT)      Cable-stayed bridges      Structural health monitoring system (SHMS)      Power spectral density     
Received: 07 July 2011      Published: 18 January 2012
CLC:  U448.27  
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Hao Wang
Zhou-hong Zong
Ai-qun Li
Teng Tong
Jie Niu
Wen-ping Deng
Cite this article:

Hao Wang, Zhou-hong Zong, Ai-qun Li, Teng Tong, Jie Niu, Wen-ping Deng. Digital simulation of 3D turbulence wind field of Sutong Bridge based on measured wind spectra. Journal of Zhejiang University-SCIENCE A (Applied Physics & Engineering), 2012, 13(2): 91-104.

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http://www.zjujournals.com/xueshu/zjus-a/10.1631/jzus.A1100177     OR     http://www.zjujournals.com/xueshu/zjus-a/Y2012/V13/I2/91

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