(1 湖南科技大学结构抗风与振动控制湖南省重点实验室， 湘潭 411201；2 湖南科技大学土木工程学院， 湘潭 411201)

［摘要］采用缩尺比为1[DK]∶20风洞试验刚性模型，以风向角及坡角为变量，针对双坡低矮建筑屋面易损区极值风压特性展开风洞试验研究。基于风压时程概率密度、偏度及峰度，对低矮建筑屋面风压高斯区与非高斯区划分进行了研究。采用Wang法、Quan法及峰值因子法对比分析了屋面风压极值估计误差，并研究了低矮建筑屋面迎风屋檐、屋脊及角部局部区域的分区阵风系数变化规律。结果表明：屋面坡角影响屋面风压高斯与非高斯分布明显。Wang法较适用于低矮建筑屋面风压极值估计。风向角对45°坡角屋面局部风压阵风系数影响较明显。9-6°，30°坡角房屋局部区域阵风系数规范取值明显小于试验值。

［关键词］低矮建筑； 极值风压； 偏度； 峰度； 阵风系数

中图分类号：TU312-1文献标识码：A文章编号：1002-848X(2020)01-0122-08

Experimental study on extreme wind pressure characteristic on gable roof vulnerable zone of low-rise building

Gao Yang1,2, Dai Yimin1,2,  Song Siji1,2, Tao Lin1,2

(1 Hunan Key Laboratory of Wind Resistant and Vibration Control of Structures, Hunan University of Science and Technology, Xiangtan 411201, China; 2 School of Civil Engineering, Hunan University of Science and Technology, Xiangtan, 411201, China)

Abstract:A rigid wind tunnel test model with a scaling ratio of 1:20 was adopted, and the wind direction angle and slope angle were taken as variables to conduct a wind tunnel test study on the extreme wind pressure characteristics of the vulnerable zone of the gable roof of the low building. Based on the time-history probability density, skewness and kurtosis of wind pressure, the division of gaussian region and non-gaussian region of wind pressure on the roofs of low buildings were studied. The Wang method, Quan method and peak factor method were used to compare and analyze the estimation error of roof wind pressure extreme value, and the variation law of regional gust coefficient in local areas of windward eaves, ridges and corners of the low-rise building was studied. The results show that the roof slope angle obviously affects the gaussian and non-gaussian distribution of roof wind pressure. Wang method is more suitable for estimating the extreme wind pressure of the low-rise building roof. Wind direction angle has obvious influence on local wind pressure gust coefficient of 45° slope angle roof. The code values of the gust coefficients of the local area of the 9-6° and 30° slope angle roofs of the building are obviously smaller than the test values.

Keywords:low-rise building; extreme wind pressure; skewness; kurtosis; gust coefficient

*国家自然科学基金项目(51578237）。

通讯作者：戴益民，博士，教授，Email：617275190@qq.com。