摘要
通过风洞试验研究了煤棚山墙疏透率对大跨度煤棚单体建筑与并列布置双煤棚整体风力系数、风荷载体型系数及极值风压系数的影响规律。研究结果表明,增加煤棚山墙疏透率有利于煤棚内外气流交换,可有效降低分离流在山墙、屋盖边缘及天窗上的风吸力。与此同时,由于山墙通风,在煤棚内部形成负压使屋盖迎风面正压体型系数和极大值风压增大。并列布置煤棚改变两煤棚相邻半跨的风压分布,屋盖整体最不利合力系数不超过单煤棚在全风向的包络值,但极值风压系数向正值方向移动。结合试验结果总结了山墙疏透煤棚的分区体型系数和分区极值风压系数,供工程设计参考。
Wind tunnel tests on single-stand and parallel-arranged large-span coal sheds with porous gables were carried out to investigate the effects of gable porosity on the overall wind load coefficients,wind load shape coefficients,and peak wind pressure coefficients of the coal sheds.The results show that,with the increment of gable porosity,the flow exchange through the porous gables can effectively alleviate the significant wind suction on the gables,roof edges and top ventilators induced by the separation flows.Moreover,negative pressure inner the coal shed is formed due to the gable ventilation,which leads to the increment of positive wind pressure on the upwind area of the roof and the amplification of positive peak wind pressure coefficients.Influenced by the neighbor coal shed,the wind pressure distribution patterns of parallel-arranged double coal sheds are different from those of single-stand coal sheds particularly on the neighboring half-span.The most unfavorable overall wind load coefficients of the roof of parallel-arranged double coal sheds can be enveloped by those of single-stand cases.However,the peak wind pressure coefficients move towards the positive direction.As a conclusion,the zone wind load shape coefficients and peak wind pressure coefficients were summarized from the wind tunnel data,providing a reference for engineering application.
作者
苏宁
彭士涛
洪宁宁
SU Ning;PENG Shitao;HONG Ningning(Tianjin Research Institute for Water Transport Engineering,China Ministry of Transport,Tianjin 300456,China)
出处
《振动与冲击》
EI
CSCD
北大核心
2021年第22期275-282,共8页
Journal of Vibration and Shock
基金
国家重点研发计划项目(2017YFE0130700)
天津市交通运输科技发展计划项目(2019-B09)
中央级公益性科院院所基本科研业务费专项(TKS190204
TKS20200106)。
关键词
煤棚
风荷载
风洞试验
疏透率
干扰效应
coal shed
wind load
wind tunnel test
porosity
interference effect
