Probability characteristics and extreme POT estimation of wind pressure coefficient of high-rise building envelope
LI Shouke1, MAO Dan1, LIU Min1, GUO Fan1, SUN Hongxin1, CHEN Yuankun2, DENG Shengxiang3
1. School of Civil Engineering, Hunan University of Science and Technology, Xiangtan 411201, China;
2. Central-South Architectural Design Institute Co., Ltd., Wuhan 430071, China;
3. Jiangxi Provincial Architectural Design and Research Institute Group Co., Ltd., Nanchang 330046, China
摘要为获得高层建筑围护结构设计风荷载，通常需要考虑其表面风压系数的概率特征，进而进行极值估计。针对当前基于超越阈值模型的风压系数极值估计方法存在阈值选取困难，需要较大样本的不足，基于高层建筑标准模型进行风洞试验，首先研究其表面风压系数的概率特征，结果表明迎风区测点接近高斯分布，分离区测点风压系数母体接近Gamma分布，风压系数极小值接近GEV(General Extreme Value)分布；提出一种改进的POT(Peak Over Threshold)极值估计方法进行表面风压系数极值估计，进而与几种传统极值估计方法进行对比，结果表明改进POT极值估计方法可实现小样本的风压系数极值估计，其估计结果与大样本容量的标准极值偏差小于5%，且稳定性较好；最后给出了标准高层建筑模型表面极值风压系数。
Abstract：As determining the design wind loads of facades of high-rise buildings, the probability characteristics of pressure coefficients should be taken account into the estimation of extreme pressure coefficients. For overcome the deficiency of hardness for determining the threshold in the POT (Peak over threshold) method for extreme estimation, the wind tunnel tests of CAARC building were conducted in wind tunnel. Firstly, the probability characteristics of pressure coefficients are specially studied, and it is shown that Gaussian distribution is good for the pressure coefficient in the upwind region, as well as the Gamma distribution is good for the pressure coefficient in the leeward region, the GEV (Generalized Extreme Value) distribution is good for the minimum pressure coefficient in the upwind region. Secondly, a modified POT method is proposed to estimate the extreme of pressure coefficients, it is indicated that the modified POT method is more accurate and more stable than the other extreme method. The bias between modified POT method and standard extreme is lower than 5% with 5 time-history samples. At last, the distributions of extreme pressure coefficients are given out for designing.
收稿日期: 2021-09-15
出版日期: 2023-01-15
引用本文:
李寿科1，毛丹1，刘敏1，郭凡1，孙洪鑫1，陈元坤2，邓声祥3. 高层建筑围护结构风压系数的概率特征及其极值POT估计[J]. 振动与冲击, 2023, 42(1): 224-231.
LI Shouke1, MAO Dan1, LIU Min1, GUO Fan1, SUN Hongxin1, CHEN Yuankun2, DENG Shengxiang3. Probability characteristics and extreme POT estimation of wind pressure coefficient of high-rise building envelope. JOURNAL OF VIBRATION AND SHOCK, 2023, 42(1): 224-231.
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