风洞随机风荷载的不确定性量化与模拟

IF 1.3 4区 工程技术 Q3 CONSTRUCTION & BUILDING TECHNOLOGY Wind and Structures Pub Date : 2023-09-13 DOI:10.3390/wind3030022
Thays G. A. Duarte, Srinivasan Arunachalam, Arthriya Subgranon, Seymour M. J. Spence
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引用次数: 0

摘要

随机风荷载的模拟是风工程中许多应用所必需的。基于适当正交分解(POD)的光谱表示方法由于其计算效率而被广泛用于此目的。对于一般风向和建筑结构,基于数据的pod随机模型是一种替代方案,它使用风洞平滑的自动和交叉谱密度作为输入,来校准目标荷载过程的特征值和特征向量。尽管与使用经验目标自动和交叉光谱密度相比,该方法简单且具有优势,但该模型的局限性和误差尚未得到研究。为此,在考虑多种风向和风向配置的矩形建筑模型上进行了广泛的实验研究,以量化与使用短时间风洞记录校准和验证基于数据的pod随机模型相关的不确定性。结果表明,数据告知模型可以有效地模拟随机风荷载,模型误差可以忽略不计,而与短持续时间风洞数据校准相关的误差可能很重要。
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Uncertainty Quantification and Simulation of Wind-Tunnel-Informed Stochastic Wind Loads
The simulation of stochastic wind loads is necessary for many applications in wind engineering. The proper-orthogonal-decomposition-(POD)-based spectral representation method is a popular approach used for this purpose, due to its computational efficiency. For general wind directions and building configurations, the data-informed POD-based stochastic model is an alternative that uses wind-tunnel-smoothed auto- and cross-spectral density as input, to calibrate the eigenvalues and eigenvectors of the target load process. Even though this method is straightforward and presents advantages, compared to using empirical target auto- and cross-spectral density, the limitations and errors associated with this model have not been investigated. To this end, an extensive experimental study on a rectangular building model considering multiple wind directions and configurations was conducted, to allow the quantification of uncertainty related to the use of short-duration wind tunnel records for calibration and validation of the data-informed POD-based stochastic model. The results demonstrate that the data-informed model can efficiently simulate stochastic wind loads with negligible model errors, while the errors associated with calibration to short-duration wind tunnel data can be important.
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来源期刊
Wind and Structures
Wind and Structures 工程技术-工程:土木
CiteScore
2.70
自引率
18.80%
发文量
0
审稿时长
>12 weeks
期刊介绍: The WIND AND STRUCTURES, An International Journal, aims at: - Major publication channel for research in the general area of wind and structural engineering, - Wider distribution at more affordable subscription rates; - Faster reviewing and publication for manuscripts submitted. The main theme of the Journal is the wind effects on structures. Areas covered by the journal include: Wind loads and structural response, Bluff-body aerodynamics, Computational method, Wind tunnel modeling, Local wind environment, Codes and regulations, Wind effects on large scale structures.
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