摘要
采用自主研发的LAC-I无线加速度传感器,对高度441.8 m的深圳京基100（KK100）的加速度响应进行了为期5年的连续监测。选取了2011年至2015年间的4次主要台风（纳沙、杜苏芮、维森特和天兔）经过时的加速度观测数据以及常态弱风和环境激励下的加速度数据,进行结构动力参数识别以及验证与风洞试验结果的一致性。结果表明：各工况下自振频率的识别结果具有很好的一致性,与其在设计阶段对结构进行有限元分析得到的相应结果约大21%;阻尼比的识别结果表现出一定的离散性,x、y两个方向的阻尼比分别在0.6%～0.9%和0.33%～0.71%之间变化,但阻尼比与振幅并不存在明显的相关性;在风场条件基本一致的情况下,实测结果与风洞试验结果具有良好的一致性;在振幅较大的横风向,实测和风洞试验得到的结构顶部峰值加速度响应相差4.2%,说明了风洞试验的可靠性。同时近5年来的连续观测遇到了与深圳地区10年重现期风压相当的最大风速,测得的瞬时峰值加速度仅为0.123 m/s2,表明该建筑的舒适度能够满足要求。
With the wireless accelerometers of model LAC-I, which were developed by the authors especially for full- scale measurements of wind-induced response of tall buildings, the acceleration of a super-tall building of 441.8 m, Shenzhen Kingkey 100 （KK100） , was monitored continuously for over five years. The recorded data during four major typhoons from 2011 to 2015, including Nesat, Doksuri, Vicente and Usagi, combined with other data measured under normal weak wind and ambient excitation, were used to identify the dynamic parameter of KK100. Then the field measured data was compared with the results of wind tunnel test to verify the reliability of the wind tunnel test. It is found that the identified natural frequencies of the structure are almost the same for all cases, and the identified result is about 21% larger than the computational result based on the finite element modeling analysis provided by the structural design consultant at the design stage, whereas the identified damping ratios are relatively discrete, distributing at the range of 0.6% -0.9% in x-direction and 0.33% -0.71% in y-direction. Moreover, the identified damping ratios have no obvious relationship with the vibration amplitudes. It is also found that under nearly the same wind circumstance, the results of full-scale measurements and wind tunnel test can match well. In the dominant across- wind direction, the peak acceleration response of wind tunnel test is 4.2% larger than that of full-scale measurements, which shows the reliability of wind tunnel test. Meanwhile, the maximum wind speed that is close to the 10-year return period wind speed in Shenzhen, has been observed in the past five years, however, the recorded maximum instantaneous acceleration of KK100 is just 0. 123 m/s2. The field measurement results show that the occupancy comfort requirement of the building can be well satisfied.
出处
《建筑结构学报》
EI
CAS
CSCD
北大核心
2016年第6期93-100,共8页
Journal of Building Structures
基金
国家自然科学基金项目(51278204
51478130)
关键词
超高层建筑
原型实测
风致响应
阻尼比
舒适度
tall building
full-scale measurement
wind-induced response
damping ratio
occupancy comfort
