摘要
为保证北京冬奥会延庆赛区场馆建筑的抗风性能满足建筑设计要求,根据小海陀站、长虫沟站和西大庄科站等3个气象站的短期风速观测记录,采用超阈值的独立风暴法确定重现期风速;进行缩尺地形模型风洞试验,根据试验风速测量结果,建立气象站与场馆位置风速的空间变换关系,由气象站重现期风速,确定赛区场馆位置处的重现期基准风速、速压;结合风洞测压试验,以雪车雪橇赛道节段遮阳棚为例,分析围护构件外表面风压极值的分布情况。研究结果表明:超阈值的独立风暴法能够较好适用于短期风速观测记录的极值风速分析,且不同阈值的选取影响重现期风速的预测值;以高山滑雪场馆处的风速分析为例,场馆的出发区、结束区、集散区与相邻气象站的风速变换比值分别约为1.1、0.7、0.8;由雪车雪橇赛道节段遮阳棚的风压极值分析可知,遮阳棚围护构件外表面最大风压力分布较最大风吸力分布均匀,最大风压力系数为1.8,最大风吸力系数为2.8。
To ensure that the wind resistance performance of the venues in the Yanqing Area of the Beijing Winter Olympic Games meets the architectural design requirements, the wind speed during the return period was determined by using the independent storm method of exceeding the threshold based on the short-term wind speed observation records of Xiaohaitao station, Changzigou station and Xidazuangke station. A wind tunnel test of the scaled terrain model was conducted. According to the test wind speed measurement results, the spatial transformation relationship between the wind speed at the weather station and the venue location was established. The reference wind speed and velocity pressure at the venue location during the return period were determined by the wind speed at the weather station. Combined with the wind tunnel pressure test, the distribution of the wind pressure extremum on the outer surface of the enclosure members was analyzed by taking the section sunshade of the snowmobile sled track as an example. The results show that the independent storm method exceeding the threshold is suitable for analyzing the extreme wind speed recorded in the short-term wind speed observation, and the selection of different thresholds affects the predicted wind speed value in the return period. Taking the wind speed analysis at the alpine ski resort as an example, the wind speed transformation ratios of the starting area, the ending area, the distribution area and the adjacent meteorological station are about 1.1, 0.7 and 0.8, respectively. According to the analysis of the wind pressure extremum of the awning in the segment of the snowmobile sled track, the maximum wind pressure distribution on the outer surface of the awning envelope is more uniform than the maximum wind suction, and the maximum wind pressure coefficient is 1.8, and the maximum wind suction coefficient is 2.8.
作者
陈伟湖
田玉基
李波
刘文珽
周长东
CHEN Weihu;TIAN Yuji;LI Bo;LIU Wenting;ZHOU Changdong(School of Civil Engineering,Beijing Jiaotong University,Beijing 100044,China;Beijing’s Key Laboratory of Structural Wind Engineering and Urban Wind Environment,Beijing 100044,China;China Architecture Design&Research Group,Beijing 100044,China)
出处
《建筑结构学报》
EI
CAS
CSCD
北大核心
2023年第3期130-136,共7页
Journal of Building Structures
基金
国家自然科学基金项目(51878040,51720105005)。
关键词
山区风气候
独立风暴法
风洞试验
围护构件
风压极值
mountain wind climate
independent storm method
wind tunnel test
enclosure member
wind pressure extremum
