A new experimental-numerical approach to estimate peak wind loads on roof-mounted photovoltaic systems by incorporating inflow turbulence and dynamic effects
A new experimental-numerical approach to estimate peak wind loads on roof-mounted photovoltaic systems by incorporating inflow turbulence and dynamic effects
复制标题
一种新的实验数值方法，通过结合流入湍流和动态效应来估计屋顶光伏系统的峰值风荷载
DOI：
10.1016/j.engstruct.2021.113739
复制
发表时间：
2022
影响因子：
5.5
通讯作者：
Irwin, Peter
中科院分区：
文献类型：
--
作者：
Estephan, Johnny;Gan Chowdhury, Arindam;Irwin, Peter
屋顶光伏 (PV) 系统等建筑附属设施在极端风力事件中很容易受到损坏。为了获得更稳健的光伏系统设计，有必要改进对峰值风效应的估计。这项研究的总体目标是开发一种预测光伏电池板峰值风荷载的方法，包括动态效应。为了预测屋顶上的峰值压力，先前开发了部分湍流模拟（PTS）方法，通过基于准稳态空气动力学理论分析合并缺失的低频湍流的影响，可以进行大规模模型测试。本论文重点关注一种新的实验数值方法，通过改进 PTS 方法来解释屋顶光伏系统的动态放大效应。这是通过数学应用阵风传递函数和机械导纳函数来实现的。所提出的先进 PTS 方法通过对安装在具有不同倾斜角度的低层建筑屋顶的不同位置的光伏电池板进行全面和小规模风洞测试来演示。将光伏电池板实验测试获得的峰值净力系数与 ASCE 7-16 中发现的峰值净力系数进行了比较。结果表明，ASCE 7-16 值目前未考虑风致对屋顶光伏系统的动态影响，明显低于当前研究估计的峰值力系数。这项研究描述了一种预测动态敏感建筑附件峰值风荷载的方法，可用于告知标准中的风荷载规定。
Building appurtenances, such as rooftop photovoltaic (PV) systems, are vulnerable to damage during extreme wind events. To have more robust designs of PV systems, improved estimation of the peak wind effects is deemed necessary. The overall aim of this research is to develop a method for predicting peak wind loads on PV panels, including dynamic effects. For predicting peak pressures on roofs, the Partial Turbulence Simulation (PTS) method has been previously developed to allow for large-scale model testing by analytically incorporating the effects of the missing low-frequency turbulence based on the quasi-steady aerodynamic theory. The current paper focuses on a new experimental-numerical methodology by advancing the PTS approach to account for the dynamic amplification effects of rooftop PV systems. This is accomplished by mathematically applying a gust transfer function and a mechanical admittance function. The proposed advanced PTS approach is demonstrated using full- and small-scale wind tunnel testing of a PV panel mounted at different locations on the roof of a low-rise building with various tilt angles. The peak net force coefficients obtained from experimental testing of the PV panel were compared with those found in ASCE 7-16. Results showed that the ASCE 7-16 values, which currently do not take into consideration the wind-induced dynamic effects on rooftop PV systems, were significantly lower than the estimated peak force coefficients from the current study. This research describes a methodology for predicting peak wind loads on dynamically sensitive building appurtenances that can be used to inform wind load provisions in standards.
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DOI：
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