地震动非平稳特性对结构反应影响的试验研究
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摘要
根据基于美国NGA数据库统计分析得到的地震动频率成分随时间的变化规律,人工拟合强度和频率非平稳特性程度不同的3组地震加速度时程作为输入,利用多子台振动台台阵系统对国家体育馆双向张弦梁结构屋盖模型(平面尺寸11.4m×14.4m)进行单向和多向地震输入下的动力试验,用于研究地震动非平稳特性对结构响应的影响。试验结果表明,结构响应随着地震动稳态持续时间的加长有增大的趋势,并且地震输入能量的集中,将可导致结构响应增大;地震动频率非平稳特性对结构响应的影响和频率随时间的变化有直接关系,后段周期明显长于前段周期的地震输入,对结构响应的增大效应比较明显。此外,地震动强度和频率非平稳特性对结构响应的影响规律对于不同的约束条件基本是一致的。
In order to investigate the influence of non-stationary characteristics of ground motion on structural response,vibration table model test of the national gymnasium bi-directional beam string structure(plane size is 11.4 m×14.4 m) is performed under the one-directional and multiple-directional ground motion inputs by using a multiple vibration table array system,and the 3 groups of acceleration time histories are fitted with various non-stationary characteristics of intensity and frequency.The time-frequency characteristics of the ground motions are obtained through analyzing the acceleration records in the NGA database of USA.The results show that the structural response tends to be enforced along with steady-state duration of the ground motion,and that the structural response will be enhanced when the earthquake energy focuses.There is a direct correlation between the influence of non-stationary characteristics of frequency on structural response and the change of the frequency with time,with the period of the latter part being significantly longer than the former part,significantly enhancing the structural response.The influences of the intensities and frequencies of ground motion on structural response are consistent under various constraints.
In order to investigate the influence of non-stationary characteristics of ground motion on structural response,vibration table model test of the national gymnasium bi-directional beam string structure(plane size is 11.4 m×14.4 m) is performed under the one-directional and multiple-directional ground motion inputs by using a multiple vibration table array system,and the 3 groups of acceleration time histories are fitted with various non-stationary characteristics of intensity and frequency.The time-frequency characteristics of the ground motions are obtained through analyzing the acceleration records in the NGA database of USA.The results show that the structural response tends to be enforced along with steady-state duration of the ground motion,and that the structural response will be enhanced when the earthquake energy focuses.There is a direct correlation between the influence of non-stationary characteristics of frequency on structural response and the change of the frequency with time,with the period of the latter part being significantly longer than the former part,significantly enhancing the structural response.The influences of the intensities and frequencies of ground motion on structural response are consistent under various constraints.
引文
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[17]董娣,周锡元,徐国栋,等.强震记录频率非平稳特性的若干研究[J].地震工程与工程振动,2006,26(1):22-29(Dong Di,Zhou Xiyuan,Xu Guodong,et al.Somestudies on frequency non-stationarity of strong earthquakerecords[J].Earthquake Engineering and EngineeringVibration,2006,26(1):22-29(in Chinese))
[2]Yeh C H,Wen Y K.Modeling of nonstationary groundmotion and analysis of inelastic structural response[J].Structural Safety,1990,8(1/2/3/4):281-298
[3]Basu B,Gupta V K.Non-stationary seismic response ofMDOF systems by wavelet transform[J].EarthquakeEngineering and Structural Dynamics,1997,26(12):1243-1258
[4]曹晖,林学鹏.地震动非平稳特性对结构非线性响应影响的分析[J].工程力学,2006,23(12):30-35(CaoHui,Lin Xuepeng.The effect on nonstationary characte-ristic of earthquake ground motion on the structuralnonlinear responses[J].Engineering Mechanics,2006,23(12):30-35(in Chinese))
[5]胡聿贤,周锡元.弹性体系在平稳和非平稳化地面运动下的反应地震工程研究报告集:第1集[R].北京:科学出版社,1962:33-50
[6]Housner G W,Jennings P C.Generation of artificialearthquake[J].Journal of Engineering MechanicsDivision,1964,90(EM1):113-150
[7]Iyengar R N,Iyengar K T S R.A nonstationary randomprocess model for earthquake accelerograms[J].Bulletin ofthe Seismological Society of America,1969,59(3):1163-1188
[8]霍俊荣,胡聿贤,冯启民.地面运动时程强度包线函数的研究[J].地震工程与工程振动,1991,11(1):1-12(Huo Junrong,Hu Yuxian,Feng Qimin.Study onenvelope function of acceleration time history[J].Earthquake Engineering and Engineering Vibration,1991,11(1):1-12(in Chinese))
[9]金星,廖振鹏.地震动强度包线函数的理论研究[J].地震学报,1994,16(4):519-525
[10]屈铁军,王君杰,王前信.局部场地上地震动的强度包络线函数的特性研究[J].地震工程与工程振动,1994,14(3):68-80(Qu Tiejun,Wang Junjie,WangQianxin.Study on characteristics of envelope function ofground motion in local site[J].Earthquake Engineeringand Engineering Vibration,1994,14(3):68-80(inChinese))
[11]Zhou X Y,Yu R F.Mode superposition method of non-stationary seismic response for non-classically dampedsystem[J].Journal of Earthquake Engineering,2008,12(3):473-516
[12]Chiou B,Darragh R,Gregor N,et al.NGAproject strong-motion database[J].Earthquake Spectra,2008,24(1):23-44
[13]樊珂,李振宝,夏兵,等.国家体育馆屋盖模型模拟地震振动台试验研究[J].北京工业大学学报,2008,34(2):159-166(Fan Ke,Li Zhenbao,Xia Bing,et al.Shaking table study on the national gymnasium roof model[J].Journal of Beijing University of Technology,2008,34(2):159-166(in Chinese))
[14]张敏政,孟庆利,刘晓明.建筑结构的地震模拟试验研究[J].工程抗震,2003(4):31-35(Zhang Minzheng,Meng Qingli,Liu Xiaoming.Study on earthquake simulatetest of structures[J].Earthquake Resistant Engineering,2003(4):31-35(in Chinese))
[15]马永欣,郑山.结构试验[M].北京:科学出版社,2001
[16]袁美巧,俞瑞芳,俞言祥.满足时频统计特性的地震动时程调整[J].应用基础与工程科学学报,2010,18(增):1-11(Yuan Meiqiao,Yu Ruifang,Yu Yanxiang.A timehistory adjusting method meeting the statistical ground motiontime-frequency characteristics[J].Journal of Basic Scienceand Engineering,2010,18(S):1-11(in Chinese))
[17]董娣,周锡元,徐国栋,等.强震记录频率非平稳特性的若干研究[J].地震工程与工程振动,2006,26(1):22-29(Dong Di,Zhou Xiyuan,Xu Guodong,et al.Somestudies on frequency non-stationarity of strong earthquakerecords[J].Earthquake Engineering and EngineeringVibration,2006,26(1):22-29(in Chinese))
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