用瞬态测压法研究高层建筑的等效设计风荷载

基于瞬态脉动测压方法 ,分析了典型断面高层建筑结构各层合力的相干特性 ,结果显示横风向脉动风荷载在漩涡脱落频率处存在和顺风向不同的显著相关性 ,相干函数值接近于 1。采用拟合方法提出了一个各层横风向脉动风荷载的相干函数公式 ,并给出了采用脉动测压技术分析高层建筑风振响应与等效荷载的简化方法。采用CAARC高层建筑标模做了风洞试验 ,将其结果与高频底座力天平方法的试验和规范方法的计算结果作了对比 ,结果较为满意。采用本文方法可以克服力天平方法要求结构的基阶模态必须线性且不能给出结构沿高度的荷载分布等缺点。最后结合一具体的工程实例 ,分析了深圳新万基国际大厦的风振响应和等效设计荷载

INVESTIGATION OF EQUIVALENT WIND LOAD ON TALL BUILDINGS USING INSTANTANEOUS PRESSURE MEASUREMENT METHOD

Coherence properties of wind load on typical tall build in g were analyzed and the results show that cross-wind loads at different heights have strong coherence at the vortex shedding frequency,and the coherence functio n here in is near to 1.On the basis of this property a new typ e of coherence function was proposed and a simplified method of analyzing struct ure's wind-induced response and equivalent load was presented.Wind tunn el experiments with the CAARC standard tall building model was executed to verif y the proposed method with the dynamic balance technique.The comparisons show a good agreement between the experimental results and the results obtained from th e proposed method on the basis of the linear mode shape assumption that is used in the balance technique.Finally,the proposed method was used to analyze the win d induced response and equivalent static load of Shenzhen Xinwanji Tower.