摘要
超高层建筑的结构动力特性是影响结构风效应评估精度的重要因素,实测是获取实际结构动力特性参数的唯一方法并已有很多研究,但实测研究中出现较大振幅的情况仍极为少见。文章采用自主研发的无线加速度传感器,对高度280m的深圳卓越世纪中心北塔(ZCC)进行连续长期监测,得到10年来多次台风作用下ZCC结构顶部加速度响应时程信号。采用不同参数识别方法分别对ZCC在5次具有代表性的台风作用下的结构顶部加速度响应时程数据进行详细分析,并将台风"山竹"的实测结果和风洞试验的结果进行对比。结果显示:不同方法识别得到的结构模态频率一致性较好,模态阻尼比则存在一定差别;结构模态频率有随振幅增大而减少的趋势,顺风向的结构模态阻尼比随加速度的增大有增大的趋势,横风向的结构阻尼比则呈现较大的离散性,和加速度振幅的相关性不明显;现场实测得到的ZCC在台风"山竹"作用下的结构顶部峰值加速度和风洞试验结果具有较好的一致性,且在连续10年中测到的最大峰值加速度为23.91cm/s^2,表明该建筑能够满足舒适度要求。
The structural dynamic characteristics of super high-rise buildings are important factors affecting assessments on the accuracy of structural wind effect.Field measurement is the only way to obtain actual structural dynamic characteristic parameters, and many relevant studies can be found.However, the situations with large amplitudes are rarely observed in the field measurements.In this work, a self-developed wireless acceleration sensor was used for long-term monitoring of the north tower of the Shenzhen Zhuoyue Century Center(ZCC) with a height of 280 m, and the acceleration response signals at the top of the ZCC tower during multiple typhoons in the past 10 years were obtained.By using different parameter identification methods, the acceleration time-histories at the top of the ZCC tower during five representative typhoons were analyzed in detail.In addition, the measured results during typhoon Mangkhut were compared with the results of wind tunnel test.Results show that the structural modal frequencies obtained by using different methods are consistent, but the modal damping ratios differ to some extent.The structural modal frequencies tend to decrease with increasing amplitude.The structural modal damping ratios in the downwind direction tend to increase with increasing acceleration, but the structural damping ratios in the crosswind direction are scattered largely, and its correlation with the acceleration amplitude is not evident.The measured peak accelerations at the top of the ZCC tower during typhoon Mangkhut agree well with the results of wind tunnel test, and the measured maximum peak acceleration for the last 10 years is 23.9 cm/s^2, indicating that the building can meet the comfort criteria.
作者
刘春雷
石碧青
张乐乐
谢壮宁
Liu Chunlei;Shi Biqing;Zhang Lele;Xie Zhuangning(State Key Laboratory of Subtropical Building Science,South China University of Technology,Guangzhou 510641,China)
出处
《土木工程学报》
EI
CSCD
北大核心
2020年第9期22-30,共9页
China Civil Engineering Journal
基金
国家自然科学基金(51908226,51278204)。
关键词
超高层建筑
风致响应
原型实测
参数识别
风洞试验
super high-rise building
wind-induced response
field measurement
parameter identification
wind tunnel test
