深圳京基100风致响应实测研究

发布时间：2018-04-15 02:09

本文选题：超高层建筑 + 原型实测　；参考：《建筑结构学报》2016年06期

【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。
[Abstract]:The acceleration response of Shenzhen Jingji 100KK100 at a height of 441.8 m was monitored continuously for 5 years using LAC-I wireless accelerometer.The acceleration data of four major typhoons (Nasha, DuSuri, Vicente and Bunny) passing between 2011 and 2015, as well as acceleration data under normal weak winds and ambient excitation were selected.The dynamic parameters of the structure are identified and verified in accordance with the results of the wind tunnel test.The results show that the identification results of natural frequencies are consistent with each other.The results obtained from finite element analysis of the structure in the design stage are about 21 and the damping ratio identification results show that the damping ratio of the two directions varies between 0.690% and 0.330.71%, respectively.However, there is no obvious correlation between damping ratio and amplitude, when the wind field conditions are basically consistent, the measured results are in good agreement with the wind tunnel test results.The difference of peak acceleration response between the measured and the wind tunnel test shows the reliability of the wind tunnel test.At the same time, the continuous observation in the past five years has encountered the maximum wind speed equivalent to the wind pressure in the 10-year recurrence period in Shenzhen, and the measured instantaneous peak acceleration is only 0.123 m / s ~ (2), which indicates that the comfort of the building can meet the requirements.
【作者单位】：华南理工大学亚热带建筑科学国家重点实验室;广州大学广东省工程结构抗风与健康监测工程技术研究开发中心;深圳市力鹏建筑结构设计事务所;同济大学土木工程防灾国家重点实验室;
【基金】：国家自然科学基金项目(51278204,51478130)
【分类号】：TU973.213

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