摘要
通过理论分析及风洞试验研究大跨屋盖结构风洞试验的模型设计问题。以气承刚度理论为主线阐述了内压传播方程及赫姆霍兹频率、四周封闭屋盖结构及墙面开孔屋盖结构的频移特性和气承刚度的相似性模拟准则,考虑了墙体柔度在理论分析中的关键作用。设计制作了大跨平屋盖刚性模型和气弹模型进行墙面开孔前后的风洞试验,试验结果与理论分析较为吻合。研究结果证明了气承刚度相似性模拟在大跨屋盖结构风洞试验中的基础性作用,并指出在模型设计中调整结构内部容积是模拟气承刚度最有效的措施,而保证刚度比的一致性则是试验成功的关键。
The problem about model design for wind tunnel test of long-span roof structures was discussed through theoretical studies and wind tunnel tests. Tracked with pneumatic stiffness, transfer equation of external pressure to internal and Helmholtz frequence, frequence-shift characteristics for roof structures with idealized closed wall and with wall having opening, and similarity criterion theory for pneumatic stiffness are discussed, the key action of wall flexibility in theoretical study is considered. Flat-roof rigid and aerodynamic models were designed and wind-tunnel tests in the case of structure with round closed wall and with wall opening were conducted. Test results agree well with the theoretical ones, which confirms the fundamental effect of pneumatic stiffness simulation in wind tunnel test for long-span roof structures. It is shown that adjusting internal volume is the most effective way for simulating pneumatic stiffness and the conformity of pneumatic stiffness and structure stiffness is the key point in model design for long-span roof structures.
出处
《建筑结构学报》
EI
CAS
CSCD
北大核心
2005年第4期92-98,共7页
Journal of Building Structures
基金
国家自然科学基金资助项目(50378085)。
关键词
大跨屋盖结构
风洞试验
模型设计
气承刚度
赫姆霍兹频率
long-span roof structure
wind tunnel test
model design
pneumatic stiffness
Helmholtz frequence
