摘要
对体型比为1.5∶1∶1的双坡屋面低矮房屋表面风压进行了数值模拟,模拟结果与同体型比的低矮建筑风洞试验结果对比的表明:所提数值模拟方法能较好地反映低矮建筑表面风压的分布,由其得到的表面风压与风洞试验结果吻合较好。以风向角为变量,深入研究了墙面开洞面积及位置对低矮房屋屋面局部风压的影响规律。结果表明,房屋墙面开洞对屋面外风压影响较小;不同墙面开洞工况对屋面风压的影响与来流风向密切相关,迎风墙面存在单一洞口时,内压与外压联合作用会显著放大其屋面风荷载。我国荷载规范在规定存在洞口的低矮房屋抗风设计时,尚需考虑风致内压的影响。
A numerical study on wind pressures of a gable- roofed low- rise building with a 1. 5∶ 1∶ 1 body type ratio was performed,compared with wind tunnel test data,the results obtained from the simulation match well; the numerical simulations can accurately reflect wind pressures distribution on low- rise buildings. The effect of wall opening area and position on local wind pressures was intensively studied considering the wind direction angle as variable. The results show that the external local pressures on roofs are less affected by the openings on building walls;the effects of different wall openings on roof wind pressures is closely related with the direction of wind flow,the combined effect of internal and external pressure can significantly enlarge the roof wind load in the case of only a single opening on the windward wall. The load code of China for wind- resistant design of low- rise buildings with openings is need to consider the effects of wind- induced internal pressure.
出处
《自然灾害学报》
CSCD
北大核心
2015年第3期244-254,共11页
Journal of Natural Disasters
基金
交通运输部重大科技项目(2011318824140)
广西防灾减灾与结构安全重点实验室开放课题(2013ZDK 06)
湖南省教育厅(13K088)
关键词
低矮房屋
数值模拟
风致内压
Helmholtz效应
low-rise building
numerical simulation
wind-induced internal pressure
Helmholtz effect
