风和温度对地王大厦模态频率的影响研究
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摘要
通过强震动监测台阵对深圳地王大厦进行长期的环境振动监测,并结合风和温度等气象数据,研究了2014年1月~10月期间风、温度、结构加速度响应和各阶模态频率的变化及其相关性,分析了风和温度对模态频率监测的影响;分别采用多元线性回归和支持向量机技术两种方法进行建模,模拟风和温度对模态频率的共同影响,并分析比较不同模型的预测效果;基于风和温度数据预测模态频率的成功率,提出了一种简便的结构健康诊断方法。结果表明,地王大厦各阶模态频率多数与风速和温度呈负相关关系。两种拟合模型均能较好地反映各阶频率的变化特征。
Long-term ambient vibration monitoring of Diwang Plaza in Shenzhen has been conducted through a strong motion monitoring array. Combined with wind,temperature and other meteorological data,changes and correlations of wind,temperature,structural acceleration response and various order modal frequency during the period from January to October in 2014 were studied and the effects of wind and temperature on the modal frequency monitoring were studied; multiple linear regression and supporting vector machine method were used for modeling respectively to simulate the combined effects of wind and temperature on the modal frequencies and analyze and compare forecasting effects of different models; based on wind and temperature data to predict the success rate of modal frequency,a simple structural health diagnosis method was proposed. The results show that most of the modal frequencies of the Diwang Plaza are negatively correlated with the wind speed and temperature. Two kinds of fitting models can well reflect the variation characteristics of the frequency of each order.
Long-term ambient vibration monitoring of Diwang Plaza in Shenzhen has been conducted through a strong motion monitoring array. Combined with wind,temperature and other meteorological data,changes and correlations of wind,temperature,structural acceleration response and various order modal frequency during the period from January to October in 2014 were studied and the effects of wind and temperature on the modal frequency monitoring were studied; multiple linear regression and supporting vector machine method were used for modeling respectively to simulate the combined effects of wind and temperature on the modal frequencies and analyze and compare forecasting effects of different models; based on wind and temperature data to predict the success rate of modal frequency,a simple structural health diagnosis method was proposed. The results show that most of the modal frequencies of the Diwang Plaza are negatively correlated with the wind speed and temperature. Two kinds of fitting models can well reflect the variation characteristics of the frequency of each order.
引文
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[3]梁仁杰,吴京,何婧,等.P-Δ效应对结构动力特性的影响[J].土木工程学报,2013,46(S2):68-72.
[4]KANAZAWA K.Structural damage detection from natural frequency eliminated by temperature effect[C]//The24th International Modal Analysis Conference(IMAC).Saint Louis,USA,2006.
[5]徐枫,陈文礼,肖仪清,等.超高层建筑风致振动的现场实测与数值模拟[J].防灾减灾工程学报,2014,34(1):51-57.
[6]钱稼茹,过静珺,陈志朋.地王大厦动力特性及大风时楼顶位移和加速度实测研究[J].土木工程学报,1998,31(6):30-38.
[7]宫贞超.超高层建筑结构简化建模与风效应分析[D].哈尔滨:哈尔滨工业大学,2008.
[8]滕军,卢云军,朱焰煌.大跨空间钢结构模态频率的温度影响监测与分析[J].工程抗震与加固改造,2010,32(3):36-41.
[9]姚昌东,李亚东.大跨度桥梁健康监测过程中的温度影响研究[J].华东交通大学学报,2008,25(2):25-28.
[10]SAITTA S,KRIPAKARAN P,RAPHAEL B,et al.Feature selection using stochastic search:an application to system identification[J].Journal of Computing in Civil Engineering,2009,24(1):3-10.
[11]ZHENG L,WATSON D G,JOHNSTON B F,et al.A chemometric study of chromatograms of tea extracts by correlation optimization warping in conjunction with PCA,support vector machines and random forest data modeling[J].Analytica Chimica Acta,2009,642(1-2):257-265.
[12]LAORY I,TRINH T N,SMITH I F C,et al.Methodologies for predicting natural frequency variation of a suspension bridge[J].Engineering Structures,2014,80(22):211-221.