防灾减灾工程学报2024，Vol.44Issue(6)：1418-1427,10.DOI:10.13409/j.cnki.jdpme.20230520001
龙卷风作用下大跨柱面煤棚风荷载特性研究
Research on the Wind Load Characteristics of Long-Span Cylindrical Coal Shed under Tornado
摘要
Abstract
To investigate the wind load characteristics of the long-span cylindrical coal shed structure under tornado action,a long-span cylindrical coal shed was taken as the engineering case.CFD numer-ical simulation methods were used to analyze the effect of tornado moving speed,angle path,and radi-al distance on the wind load of the long-span cylindrical coal shed.Based on the analysis results,wind pressure zoning on the coal shed surface under tornado load was conducted to provide recommenda-tions for engineering design.The results showed that,under tornado action,the wind load on the coal shed surface was primarily dominated by wind suction.The wind pressure coefficient on the coal shed surface exhibited a centrally symmetric distribution at the position d=0Rm.The maximum wind pres-sure coefficient difference occurred on the coal shed surface at d=1.0Rm,with the maximum wind pres-sure coefficient difference being about 1.88 times the extreme negative wind pressure value.The in-crease of tornado moving speed strengthened the flow separation phenomenon in the right-side edge zone,causing an increase in the absolute value of the wind pressure.However,once the tornado mov-ing speed reached a threshold,the wind pressure coefficient stopped increasing and began to decrease.Compared to the 0° path,at the 45° angle path,the maximum negative wind pressure coefficient on the coal shed surface was-1.8.At the 90° angle path,the flow separation phenomenon in the lower-right corner of the coal shed weakened,and the absolute value of the maximum negative wind pres-sure decreased.The tornado moving speed had a greater influence on zone A2 and zone D.Under the same angle path,when the tornado moving speed varied,the absolute value of the wind pressure coef-ficient in the A2 area changed by up to 28%,and the absolute value of the wind pressure coefficient in the D area changed by up to 46%.Compared to other paths,at the 90 ° angle path,the wind pressure coefficient differences in regions excluding the B2 zone were larger,with higher wind pressure ob-served in corner and edge areas.Engineering design should therefore focus on strengthening the design of the roof panels in the corner and edge areas of the structure.关键词
龙卷风荷载/数值模拟/移动速度/角度路径/风压系数Key words
tornado load/numerical simulation/moving speed/angle path/wind pressure coefficient分类
建筑与水利引用本文复制引用
李玉学,董阳,陈铁..龙卷风作用下大跨柱面煤棚风荷载特性研究[J].防灾减灾工程学报,2024,44(6):1418-1427,10.基金项目
国家自然科学基金资助项目(51278314)、河北省自然科学基金资助项目(E2019210031)、中央引导地方科技发展资金项目(206Z5401G)、北京交通大学"结构风工程与城市风环境北京市重点实验室"开放课题(2023-1)资助 （51278314）
