杭州市民中心高空连廊动力特性分析与测试
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摘要
使用基于平均正则化功率谱密度的峰值法和模态置信因子对杭州市市民中心的关键子结构——高空钢结构连廊的动力特性进行数值模拟和现场实测比较研究。基于有限元理论建立三维有限元模型,并通过模态分析获得结构主要的频率和振型。在输入未知情况下对连廊进行动力检测。动力检测过程包括通过传感器网络和数据采集系统获得高空连廊在风荷载和地脉动等环境激励作用下的响应时程和基于实测响应时程的试验模态分析过程。在实测连廊响应时程的基础上,使用基于平均正则化功率谱密度的峰值法和半功率带宽法识别结构的主要频率、振型和阻尼比。引入模态置信因子,对计算模态信息和实测模态信息进行比较分析,以验证数值模型的准确性。研究结果可为全面了解高空钢结构连廊的动力性态、准确预测结构的动力响应提供重要依据。
Hangzhou civic center is a steel skybridge connected hexadic-tower high-rise reinforced concrete building. The 23th and 24th stories of the six reinforced concrete towers are connected through six steel skybridges at the height of about 90 meters. In order to capture the real structural behavior of the skybridges, numerical modeling and dynamic testing were conducted using Averaged Normalized Power Spectral Density (ANPSD) and Modal Assurance Criteria (MAC). A three dimensional finite element model was firstly created, and the several lower frequencies and modal shapes were obtained through modal analysis procedure. Based on the sensor network and data acquisition system, time response histories of the skybridge under the ambient excitation such as wind and unknown ground motion were recorded. The main frequencies, modal shapes and corresponding damping ratios of the skybridge were obtained by of the ANPSD and half-power bandwidth methods. MAC was employed to compare the calculated modal information with them extracted from the dynamic testing. The accuracy of the numerical model was evaluated. The results can be used to understand the dynamic behavior of the skybridge and to predict the dynamic response of the building in future studies.
Hangzhou civic center is a steel skybridge connected hexadic-tower high-rise reinforced concrete building. The 23th and 24th stories of the six reinforced concrete towers are connected through six steel skybridges at the height of about 90 meters. In order to capture the real structural behavior of the skybridges, numerical modeling and dynamic testing were conducted using Averaged Normalized Power Spectral Density (ANPSD) and Modal Assurance Criteria (MAC). A three dimensional finite element model was firstly created, and the several lower frequencies and modal shapes were obtained through modal analysis procedure. Based on the sensor network and data acquisition system, time response histories of the skybridge under the ambient excitation such as wind and unknown ground motion were recorded. The main frequencies, modal shapes and corresponding damping ratios of the skybridge were obtained by of the ANPSD and half-power bandwidth methods. MAC was employed to compare the calculated modal information with them extracted from the dynamic testing. The accuracy of the numerical model was evaluated. The results can be used to understand the dynamic behavior of the skybridge and to predict the dynamic response of the building in future studies.
引文
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[3]李国强,陈素文,李杰,等.上海金茂大厦结构动力特性测试[J].土木工程学报,2000,33(2):35-39(Li Guoqiang,Chen Suwen,Li Jie,et al.Measurements of dynamic properties of Shanghai Jinmao Mansion[J].China Civil Engineering Journal,2000,33(2):35-39(in Chinese))
[4]何敏娟,马人乐,黄征.336m高钢结构电视塔模态参数实测与分析[J].同济大学学报,2001,29(7):862-866(He Minjuan,Ma Renle,Huang Zheng.Measurements and analysis of modal parameter of broadcast and television steel tower[J].Journal of Tongji University,2001,29(7):862-866(in Chinese))
[5]任伟新,林友勤,彭雪林.大跨度斜拉桥环境振动试验与分析[J].实验力学,2006,21(4):418-426(Ren Weixin,Lin Youqin,Peng Xuelin.Ambient vibration tests and analysis of a large span cable stayed bridge[J].Journal of Experimental Mechanics,2006,21(4):418-426(in Chinese))
[6]吕西林,施卫星,沈剑昊,等.上海地区几幢超高层建筑振动特性实测[J].建筑科学,2001,17(2):36-39
[7]Abdel-Ghaffar A M,Housner G W.Ambient vibration tests of suspension bridge[J].Journal of the Engineering Mechanics Division,1978,104(5):983-999
[8]Felber A J.Development of a hybrid evaluation system[D].Vancouver:University of British Columbia,1993
[9]戴诗亮.随机振动实验技术[M].北京:清华大学出版社,1984
[10]王济,胡晓.MATLAB在振动信号处理中的应用[M].北京:中国水利水电出版社,2006
[11]Bendat J S,Piersol A G.Engineering Applications of Correlation and Spectral Analysis[M].2nd edition.New York:John Wiley&Sons,1993
[12]任伟新.环境振动系统识别方法的比较分析[J].福州大学学报:自然科学版,2006,29(6):80-86(Ren Weixin.Comparison of system identification methods using ambient vibration measurements[J].Journal of Fuzhou University:Natural Science Edition,2006,29(6):80-86(in Chinese))
[13]宝志雯,陈志鹏.从建筑物的脉动响应确定其动力特性[J].深圳大学学报:理工版,1986,(1):36-47(Bao Zhiwen,Chen Zhipeng.Experimentel determination of dynamic characteristics of a structure by means of its ambient response signals[J].Journal of Shenzhen University Science and Engineering,1986,(1):36-47(in Chinese))
[14]宝志雯,来晋炎,陈志鹏.建筑物的脉动试验及其数据处理的方法[J].振动与冲击,1987,(2):57-62(Bao Zhiwen,Lai Jinyan,Chen Zhipeng.Ambient vibration measure-ments and signal analyses for determination of dynamic characteristics of varied structures[J].Journal of Vibration and Shock,1987,(2):57-62(in Chinese))
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