有关高层建筑结构风振荷载的比较分析

本文根据作者收集到的有关资料与研究成果,发现国外有关规范中根据风洞试验数据给出的横风向脉动风压谱与原型观测数据有一定的差异,文中通过对作用在结构上脉动风荷载进行对比分析,对横风向风振响应计算方法提出了一些改进意见,从而达到不低估设计基准期内最大风速的横风向风振反应值的效果。由于超高层的横风向振动可能大于顺风向振动,文中建议在风振反应分析中,应同时考虑顺、横两个方向引起的作用力。

Some Comparison Analysis for Wind Pressure Fluctuation Load Acting on High Rise Building

In view of existing literature materials,it is found that the across-wind fluctuation pressures getting from prototype observation and the evaluated values by foreign design codes which are based on wind tunnel test are somewhat different.Through comparative analysis some suggestions in aspect of wind induced vibration effect on high-rise building have been put forward in this paper.The modified wind induced vibration effect in across-wind direction will not be underestimated within non-resonant but fairly large wind velocity range,and then more accurate fluctuating wind load evaluation could be expected.Since the wind induced vibrations in across-wind direction in slender high rise buildings is probably larger than that in wind blowing direction.It is suggested that the effects in wind blowing direction and across-wind direction should be taken into account simultaneously in wind resisting design work.