混凝土模型梁模态试验方法
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摘要
为有效测定混凝土模型梁的动力特性,选择一种适合于混凝土模型梁弯曲固有振动频率振型的测试方法,通过采用不同边界支承条件、激振点位置、激励大小和使用不同的激励力锤顶帽分别进行测试,发现不同边界支承条件和激励力锤顶帽对测试精度的影响很大,在不同激振点激励对频率的数值大小影响不大,但对频率的采集有影响,不同激励大小直接影响频率的采集。测试结果表明:对混凝土模型梁弯曲固有振动频率振型的测试,边界支承条件宜选择橡胶支座;激振点宜选在1/4跨点或1/6跨点处;激励力锤顶帽宜选择橡胶顶帽;激力的大小应根据不同模型梁通过试敲确定。
In order to effectively assess the dynamic feature of the concrete beam model,an experiment testing method that is suitable for the natural frequency and mode shape of the concrete beam model was proposed.In this method,the bearing condition,the excitation position,the excitation force and the hammer cap is taken into account.The results show that the bearing condition and the hammer cap have a considerable relationship with the test,and the excitation position has a little influence on the natural frequency,but it effects the collection of frequency.The research also indicate that using rubber excitation cap can obtain good modal parameters of the concrete sited on the rubber bearings,the excitation position should be selected on the sites of 1/4 or 1/6 of the span,and the excitation force should be determined according to the different model.3 tabs,4 figs,10 refs.
In order to effectively assess the dynamic feature of the concrete beam model,an experiment testing method that is suitable for the natural frequency and mode shape of the concrete beam model was proposed.In this method,the bearing condition,the excitation position,the excitation force and the hammer cap is taken into account.The results show that the bearing condition and the hammer cap have a considerable relationship with the test,and the excitation position has a little influence on the natural frequency,but it effects the collection of frequency.The research also indicate that using rubber excitation cap can obtain good modal parameters of the concrete sited on the rubber bearings,the excitation position should be selected on the sites of 1/4 or 1/6 of the span,and the excitation force should be determined according to the different model.3 tabs,4 figs,10 refs.
引文
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[6]翟振东,赵均海.试验模态分析应用于建筑结构动力计算[J].武汉城市建设学院学报,1997,14(2):37-41.ZHAI Zhen-dong,ZHAO Jun-hai.Application ofexperimental model analysis into architecturalengineering[J].Journal of Wuhan Urban ConstructionInstitute,1997,14(2):37-41.
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[8]张建仁,王磊.既有钢筋混凝土桥梁构件承载力估算方法[J].中国公路学报,2006,19(2):49-55.ZHANG Jian-ren,WANG Lei.Estimated approachto carrying capacity of existing reinforced concretebridge member[J].China Journal of Highway andTransport,2006,19(2):49-55.
[9]Allbright K,Parekh K,Miller R,et al.Modal verificationof a destructive test of a damaged prestressed concretebeam[J].Experimental Mechanics,1994,34(4):389-396.
[10]周敉,贺检海,袁万城.RC梁桥承载力的振动测试评估方法[J].交通运输工程学报,2006,6(3):62-67.ZHOU Mi,HE Shuan-hai,YUAN Wan-cheng.Capacity evaluation of RC girder bridge with vibrationtesting technique[J].Journal of Traffic andTransportation Engineering,2006,6(3):62-67.
[2]林超.钢筋混凝土桥梁的振动测量[J].华南地震,2003,23(1):82-86.LIN Chao.Vibration measurement of reinforcedconcreted bridges[J].South China Journal ofSeismology,2003,23(1):82-86.
[3]谢红霞,宿健,易宏,等.冲击荷载进行桥梁模态试验的研究[J].公路交通科技,2005,22(8):86-89.XIE Hong-xia,SU Jian,YI Hong,et al.Research onbridge modal identification by impulse load[J].Journal of Highway and Transportation Research andDevelopment,2005,22(8):86-89.
[4]姜海波,赵人达.带边界条件损伤简支梁振动模态分析[J].振动与冲击,2004,23(2):72-74.JIANG Hai-bo,ZHAO Ren-da.Vibration modeanalysis of simply supported beam with damageboundary condition[J].Journal of Vibration andShock,2004,23(2):72-74.
[5]罗晓健,于国友.几种模态分析方法在结构无损检测中的应用[J].中国海洋平台,2006,21(5):44-49.LUO Xiao-jian,YU Guo-you.Application of modalanalysis methods in non-destructive damageevaluations[J].China Offshore Platform,2006,21(5):44-49.
[6]翟振东,赵均海.试验模态分析应用于建筑结构动力计算[J].武汉城市建设学院学报,1997,14(2):37-41.ZHAI Zhen-dong,ZHAO Jun-hai.Application ofexperimental model analysis into architecturalengineering[J].Journal of Wuhan Urban ConstructionInstitute,1997,14(2):37-41.
[7]刘龄嘉,贺拴海,赵小星.在役混凝土简支梁有效预应力计算[J].交通运输工程学报,2005,5(3):47-51.LIU Ling-jia,HE Shuan-hai,ZHAO Xiao-xing.Effective prestress computation of existing PCsimply-supported beam[J].Journal of Traffic andTransportation Engineering,2005,5(3):47-51.
[8]张建仁,王磊.既有钢筋混凝土桥梁构件承载力估算方法[J].中国公路学报,2006,19(2):49-55.ZHANG Jian-ren,WANG Lei.Estimated approachto carrying capacity of existing reinforced concretebridge member[J].China Journal of Highway andTransport,2006,19(2):49-55.
[9]Allbright K,Parekh K,Miller R,et al.Modal verificationof a destructive test of a damaged prestressed concretebeam[J].Experimental Mechanics,1994,34(4):389-396.
[10]周敉,贺检海,袁万城.RC梁桥承载力的振动测试评估方法[J].交通运输工程学报,2006,6(3):62-67.ZHOU Mi,HE Shuan-hai,YUAN Wan-cheng.Capacity evaluation of RC girder bridge with vibrationtesting technique[J].Journal of Traffic andTransportation Engineering,2006,6(3):62-67.
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