- 摘 要
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（1 福州大學(xué)土木工程學(xué)院， 福州 350108； 2 比利時魯汶大學(xué)土木工程系， 魯汶B 3001）
［摘要］針對一座高23m的特種鋼結(jié)構(gòu)與一座高300m的鋼筋混凝土電視塔，采用RSV-150超遠工作距離激光測振儀，開展了結(jié)構(gòu)在環(huán)境激勵下的振動實測與模態(tài)參數(shù)識別。作為一種非接觸式的測量方式，激光測振儀具有操作簡單、測量便捷等優(yōu)點。采用了基于隨機子空間方法的結(jié)構(gòu)模態(tài)識別算法，對實測到的結(jié)構(gòu)速度響應(yīng)進行了模態(tài)分析。分析結(jié)果表明，該算法具有精度高、穩(wěn)定性好的優(yōu)點，可以有效地獲取結(jié)構(gòu)的自振頻率與阻尼。選擇結(jié)構(gòu)的不同部位作為激光測振的反射點，對實測的自振頻率影響不大，結(jié)果離散性較小。進行了結(jié)構(gòu)的簡化有限元分析，數(shù)值模擬獲得的模態(tài)信息與實測結(jié)果之間有較好的對應(yīng)性，驗證了試驗方法的可靠性。
［關(guān)鍵詞］高聳結(jié)構(gòu)； 環(huán)境振動實測； 非接觸式測量； 隨機子空間模態(tài)識別； 可靠性
中圖分類號：TU317+.2文獻標識碼：A文章編號：1002-848X(2019)22-0130-05
Ambient vibration tests and modal identification of environmental vibration of two high-rise structures based on RSV-150 laser sensing vibrometer
He Leqia 1, Huang Jizhuo 1, Edwin Reynders2
(1 College of Civil Engineering, Fuzhou University, Fuzhou 350108, China; 2 Department of Civil Engineering, University of Leuven, Leuven B 3001, Belgium)
Abstract:For a 23m high special steel structure and a 300m high reinforced concrete TV tower, the RSV-150 sensing vibrometer with ultra-long working distance was used to carry out the ambient vibration tests and modal identification. As a non-contact measurement technique, the laser sensing vibrometer has the advantages of simple operation and convenient measurement. The stochastic subspace identification method was adopted for modal analysis of the measured velocity responses. The experimental results show that the algorithm has the advantages of high precision and good stability, which can effectively extract the natural frequencies and damping ratios of the structure. Especially, selecting different parts of the structure as the reflection points has little effect on the measured natural frequencies, and variations of the experimental result are relatively small. Finite element analysis of the structures was carried out based on simplified models. The numerical modal results have a good correspondence with the measured ones, which verifies the reliability of the experimental technique.
Keywords:high-rise structure; ambient vibration test; non-contact measurement; stochastic subspace identification; reliability
*福州大學(xué)引進人才科研啟動項目（XRC-1675）和福州市科技局市校（院所）科技合作項目（2017-G-67）。
作者簡介：何樂洽，博士，助理研究員，Email：Leqia.He@fzu.edu.cn。
