龙卷风作用下双拱屋面风荷载特性研究  

STUDY ON WIND LOAD CHARACTERISTICS OF DOUBLE-ARCH ROOFS UNDER TORNADO CONDITIONS

作　　者：赵方锐 李方慧[1] 朱志峰 张舒涵 白宇 李灏文 ZHAO Fangrui;LI Fanghui;ZHU Zhifeng;ZHANG Shuhan;BAI Yu;LI Haowen(School of Civil Engineering,Heilongjiang University,Harbin 150086,China)

机构地区：[1]黑龙江大学建筑工程学院,哈尔滨150086

出　　处：《低温建筑技术》2024年第9期147-151,共5页Low Temperature Architecture Technology

摘　　要：为研究龙卷风对连续双拱屋面的风荷载影响,研究利用Ward型龙卷风模拟发生装置,并选用Realizable k-ε湍流模型,对龙卷风作用下的连续双拱屋面风荷载进行了详细的数值模拟分析。基于0.5的涡流比,针对三种不同的前跨矢跨比(1/4、1/5、1/6),分析连续双拱屋面的风压系数和周围迹线。结果表明当屋面位于龙卷风核心时,连续双拱屋面的风压系数呈现出负压特征,而且屋檐两侧的风压变化更加显著,而屋顶中部的风压则相对稳定。当矢跨比增加时,连续双拱屋面的最大负压会略微升高,由0.54增加至0.552,增大了2.2%。研究可为龙卷风对低矮建筑的数值模拟提供不同矢跨比模型的参考。To study the impact of tornadoes on wind loads for continuous double-arch roofs,this research employs a Ward-type tornado simulation device and the Realizable k-εturbulence model to conduct detailed numerical simulations of wind loads on continuous double-arch roofs under tornado conditions.Using a vortex ratio of 0.5 and three different span-to-rise ratios(1/4,1/5,and 1/6),the study analyzes the wind pressure coefficients and surrounding traces for the continuous double-arch roof.The results indicate that when the roof is located in the core of the tornado,the wind pressure coefficients for the continuous double-arch roof exhibit negative pressure characteristics.Additionally,wind pressure variations are more pronounced on the eaves,while the pressure in the middle of the roof remains relatively stable.As the span-to-rise ratio increases,the maximum negative pressure on the continuous double-arch roof slightly increases,from 0.54 to 0.552,a 2.2%increase.This research provides reference models with different span-to-rise ratios for numerical simulations of tornado impacts on low-rise buildings.

关 键 词：双拱屋面 涡流比 矢跨比 风压系数 

分 类 号：TU312[建筑科学—结构工程]