|Table of Contents|

Analysis and simulation of non-stationary typhoon field on long-span bridge(PDF)

长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]

Issue:
2022年6期
Page:
66-76
Research Field:
桥梁工程·交通基础设施智能化运维技术专栏
Publishing date:

Info

Title:
Analysis and simulation of non-stationary typhoon field on long-span bridge
Author(s):
HAO Jian-ming1;  FENG Yu1;  SU Quan-ke1; 2;  HAN Wan-shui1
(1. School of Highway, Chang’an University, Xi’an 710064, Shaanxi, China; 2. Hongkong Zhuhai Macao Bridge Authority, Zhuhai 519015, Guangdong, China)
Keywords:
bridge engineering;  typhoon simulation;  Hilbert transform;  wavelet packet transform;  non-stationary;  sea-crossing bridge
PACS:
U442
DOI:
10.19721/j.cnki.1671-8879.2022.06.007
Abstract:
To realize the non-stationary typhoon wind field simulation of sea-crossing bridge based on data, non-stationary wind speed model based on discrete wavelet transform(DWT)was used to extract time-varying mean wind, the characteristic of mean wind and fluctuating wind obtained from stationary model and non-stationary model were analyzed, with the non-stationary characteristics of typhoon emphasized. The wavelet packet transform(WPT)and the Hilbert transform was used to obtain instantaneous information of non-stationary signal, univariate non-stationary wind speed was simulated by inverse transformation. The spatial multiscale correlation coefficient matrix was established based on coherence-correlation function, correlated frequency-modulated subcomponents was generated from uncorrelated frequency-modulated subcomponents using Cholesky decomposition. Hence, multivariate non-stationary wind speed could be simulated, and it was applied to the non-stationary wind field simulation of a sea-crossing cable-stayed bridge. The results show that the significant difference between the turbulence characteristics of fluctuating wind obtained from stationary model and non-stationary model can be observed, which decreases with the decrease of averaging interval. Hilbert spectrum can intuitively show the time-frequency distribution characteristics of typhoon wind speed energy and describe the transient characteristics of non-stationary fluctuating wind. The non-stationary wind field simulation of a sea-crossing cable-stayed bridge are in good agreement with measurements in terms of Hilbert spectrum, Arias intensity, Rényi entropy, fractal dimension and the correlation coefficient, which means the simulation is valid.13 figs, 24 refs.

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Last Update: 2022-12-20