摘要
在接近垂直迎风情况下对抚顺市内某小区的一矩形高层居民楼采用三维超声风速仪和低频麦克风对楼顶风场和楼房迎风面风压进行实际测量,同时采用加速度传感器对麦克风所在高度处建筑的振动情况进行同步监测。对顺风向脉动风速和脉动风压分析结果表明,建筑顺风向的脉动风速和脉动风压都不符合正态分布,两者偏离趋势、偏离程度并不一致,建筑顶部的顺风向风速谱与von Karman谱符合较好,并且对于高度为80 m左右的矩形建筑,风速不大时,在建筑物迎风面相对高度约0.8处的滞流区,迎风面的脉动风压与脉动风速仍旧符合准定常假设。通过对春季和秋季测得的两次数据进行对比分析发现,尽管两次测量时天气情况及风力级别接近,但秋季风的脉动强度要远大于春季风。楼房两个主轴方向的加速度响应显示楼房发生了扭转现象。
This paper presents some selected results obtained from the field measurements of wind effects with theoncoming flow perpendicular to the facade of a rectangular high- rise residential building located in Fushun. Synchronousdata of roof- top wind velocities, windward pressures, and acceleration responses are recorded by a three- dimensionalultrasonic anemometer, a low frequency microphone, and two accelerometers respectively. The measured data is analyzed toobtain the information of wind characteristics and wind-induced response of the structure. Statistical analysis of longitudinalfluctuating wind velocities and windward fluctuating pressures shows that they don't obey the normal distribution andexhibit different deviation trends and degrees. The windward fluctuating wind- velocity spectrum of the roof- top of thebuilding agrees well with the von Karman spectrum. For the 80-meter-high rectangular building in the condition of normalwind velocity, the quasi-steady assumption is still appropriate in the windward surface stagnation zone at the relative heightof 0.8 and in the analysis of the fluctuating wind pressure and wind velocity. In addition, by comparing the data measured inspring and autumn, it is also found that the wind turbulence is stronger in autumn than that in spring despite that the data inthe two seasons are obtained in similar weather conditions and wind force levels. Moreover, the acceleration response dataalong the two principal directions of the building reveals the torsional vibration phenomena of the building.
作者
朱艳英
孟令常
玉姣
ZHU Yan-ying;MENG Ling-chang;YU Jiao(College of Science, Liaoning Shihua University, Fushun 113001, Liaoning China)
出处
《噪声与振动控制》
CSCD
2016年第5期122-127,共6页
Noise and Vibration Control
基金
国家自然科学基金青年科学基金资助项目(11304137)
辽宁省高校杰出青年学者成长计划资助项目(LJQ2013042)
辽宁石油化工大学博士科研启动基金资助项目(80040169)
关键词
振动与波
脉动风速
脉动风压
功率谱
风致加速度响应
矩形高层建筑
vibration and wave
fluctuating wind velocities
fluctuating wind pressure
power spectrum
wind-induced acceleration response
rectangular high-rise building
