李秋胜1,2,王云杰1,李建成1,时峰1.屋盖角部开孔的低矮房屋屋面风荷载特性研究[J].湖南大学学报:自然科学版,2014,41(6):1~8
屋盖角部开孔的低矮房屋屋面风荷载特性研究
Study of the Wind-induced Roof Pressure Characteristics of a Low-rise Building with Holes on Its Roof Corner
  
DOI:
中文关键词:  低矮房屋  风洞试验  风荷载  锥形涡  孔口
英文关键词:low-rise building  wind tunnel testing  wind loading  conical vortex  orifices
基金项目:
作者单位
李秋胜1,2,王云杰1,李建成1,时峰1 (1.湖南大学 教育部建筑安全与节能重点实验室湖南 长沙4100822. 香港城市大学香港100013) 
摘要点击次数: 482
全文下载次数: 455
中文摘要:
      基于实测房屋模型风洞试验,分析了屋盖角部不同开孔大小和开孔形状情况下低矮房屋的风荷载特性.内外压的叠加作用使屋盖上出现了很大的正风压,内压整体分布均匀,开孔面积越小,内压作用越强;内压的概率密度接近于高斯分布,净压的非高斯特性相比于外压有所减弱;内压在频域内也表现出很强的相关性,内压谱在Helmholtz频率和漩涡脱落频率处均出现了谱峰值,净压谱中漩涡脱落作用被抵消;内压的荷载特性间接反映出迎风前缘的长度有利于锥形涡的发展,成对出现的锥形涡并非同时同步达到最强.
英文摘要:
      Based on the wind tunnel testing of a low-rise building, the wind pressure characteristics of the low-rise building with holes of different sizes and shapes on its roof corner were analyzed. The superimposition of internal and external pressures makes the emergence of large positive pressure on the roof. The internal pressure shows an overall uniform distribution. With the opening area becoming smaller, the internal pressure gets stronger. The probability density function of the internal pressure is closer to the Gaussian distribution, and when compared with external pressure, the non-Gaussian characteristic of net pressure is weakened. The internal pressure also exhibits a strong correlation in frequency domain. There appear two humps in the internal pressure spectrum corresponding to Helmholtz frequency and vortex shedding frequency, and the peak of the vortex shedding frequency is offset for the case of net pressure. Furthermore, the internal pressure characteristics indirectly show that the length of the front edge enhances the development of the conical vortices and the conical vortices appearing in pairs do not become the strongest simultaneously.
查看全文  查看/发表评论  下载PDF阅读器
关闭