摘要
球形屋面网壳结构是常用的大跨结构屋面形式.在同济大学TJ-3大气边界层风洞中,通过1∶200比例的刚性测压模型,研究了A,B两类风场下半球形屋面结构表面的平均以及脉动风压分布特征.试验结果表明风场类型对平均风压分布影响较小,但对脉动风压分布会有相对较大的影响.同时通过研究子午线上平均及脉动风压分布,表明结构顶部的突出圆顶(采光顶)将增大结构局部风荷载,设计时需特别考虑.最后给出了适合工程应用的分块体型系数,以供结构工程师设计参考.
The spherically-reticulated shells are frequently used for the large-span roof structures.By applying the TJ-3 terrain wind tunnel located in Tongji University,the A-and B-type terrains are primarily investigated based on a rigid pressure-testing model with a 1∶200 scale.In this process,the mean and pulsation wind pressure distributions are detected for the structural surface of a hemispherical dome.Subsequently,it is indicated from experimental results that the terrain type does not impact much on the wind pressure distribution but the pulsation pressure distribution.With regard to the mean and pulsation pressure distributions along the dome centerline,it is revealed that the day-lighting ceiling,which increases the local wind loads,should be particularly taken into account for structural design.Consequently,the block-shape coefficients are practically provided for the references of structure engineers.
出处
《中国工程机械学报》
2009年第3期351-355,378,共6页
Chinese Journal of Construction Machinery
基金
国家自然科学基金资助项目(50708082)
国家自然科学基金创新研究群体计划资助项目(50621062)
关键词
半球形屋面结构
风洞试验
体型系数
hemispherical dome wind tunnel testing shape coefficient