土-结构相互作用对结构监测与辨识结果的影响
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摘要
通过对一个现有建筑的结构动态参数的辨识讨论了土与结构的相互作用。目标建筑是建于1998年的8层的型钢混凝土结构。在此研究中,8自由度的模型被建立以分析微震观测数据,随即,非参数和参数技巧以辨识此结构的自然频率,阻尼率和层硬度等。在考虑土-结构相互作用和不考虑土-结构相互作用的两种情况下,分别辨识结构的参数并对比结果以证实其对辨识结果的影响。在文中非参数方法包括众所周知的传递函数和随机减量法,参数方法是非线性的系统辨识工具ARX(Auto-Regression with extra input)方法。
The authors attempt to consider the effect of soil-structure interaction by identifying the dynamic parameters of an existing building.Target building is an 8-story steel encased reinforced concrete building,which was constructed in 1998.In the study,an eight-degree-of-freedom analytical model is utilized to analyze the data from microtremor measurement.Then,nonparametric and parametric techniques are employed to determine natural frequency,damping ratio and story stiffness of the structure.For these two cases,one is without considering the effect of soil-structure interaction;the other is with considering the effect of soil-structure interaction.Comparing the results of these two cases,the effect of soil-structure interaction can be confirmed.Nonparametric methods include the well known transfer function and random decrement method.The parametric method employed herein is the off-line system identification method ARX(Auto-Regression with extra input).
The authors attempt to consider the effect of soil-structure interaction by identifying the dynamic parameters of an existing building.Target building is an 8-story steel encased reinforced concrete building,which was constructed in 1998.In the study,an eight-degree-of-freedom analytical model is utilized to analyze the data from microtremor measurement.Then,nonparametric and parametric techniques are employed to determine natural frequency,damping ratio and story stiffness of the structure.For these two cases,one is without considering the effect of soil-structure interaction;the other is with considering the effect of soil-structure interaction.Comparing the results of these two cases,the effect of soil-structure interaction can be confirmed.Nonparametric methods include the well known transfer function and random decrement method.The parametric method employed herein is the off-line system identification method ARX(Auto-Regression with extra input).
引文
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[14]陈跃庆,吕西林,李培振,等.不同土性的地基-结构动力相互作用振动台模型试验对比研究[J].土木工程学报,2006,39(5):58-64.
[15]尚守平,贺志文,王海东,等.上部结构与地基相对刚度比对土-结构体系基频影响试验研究[J].地震工程与工程振动,2008,28(5):94-101.
[16]王凤霞,何政,欧进萍.桩-土-结构动力相互作用的线弹性地震反应分析[J].世界地震工程,2003,19(2):58-66.
[2]Douglas E.Adams,Health monitoring of structural materials and components[M].New York,(USA):John Wiley&Sons,Ltd,2007.
[3]Ljung L.System identification-theory for the user[M].Upper Saddle River,(NJ):PTR Prentice Hall.,1999.
[4]Moore S M,Lai J C S,Shankar K.ARMAX modal parameter identification in the presence of unmeasured excitation-II:Numerical and experimen-tal verification[J].Mechanical Systems and Signal Processing,2007,21(4):1601-1615.
[5]Fassois S D.Mimo LMS-ARMAX identification of vibrating structures-Part I:The method[J].Mechanical Systems and Signal Processing2,001,15(4):723-735.
[6]Florakis A,Fassois S D,Hemez F M.MIMO LMS-ARMAX identification of vibrating structures PartⅡ:A critical assessment[J].Mechanical sys-tems and signal processing,20011,5(4):737-758.
[7]Penrose R.A generalized inverse for matrices proc[J].Cambridge Phil.Soc,1955,51:406-413.
[8]姜忻良,严宗达,李忠献.多点输入的相邻结构-地基-土地震反应分析[J].地震工程与工程振动1,997,17(4):65-71.
[9]姜忻良,严宗达,李忠献.考虑地面差动的相邻结构-地基-土相互作用[J].地震工程与工程振动1,997,17(2):67-73.
[10]任隽,朱元清,秦浩文.上海地震台阵标定及结果分析[J].西北地震学报2,002,24(4):325-329.
[11]任隽,陈运平,潘纪顺,等.海南岛及其近海中强地震前加卸载响应比的变化特征[J].西北地震学报,20052,7(1):71-74.
[12]任隽,朱元清,潘纪顺,等.上海地震台阵与台网的定位及视慢度研究[J].地震研究,20022,5(4):335-340.
[13]任隽,袁志祥,冯希杰,等.陕西石泉ML4.9级地震建筑物震害分析[J].灾害学,20041,9(s):53-56.
[14]陈跃庆,吕西林,李培振,等.不同土性的地基-结构动力相互作用振动台模型试验对比研究[J].土木工程学报,2006,39(5):58-64.
[15]尚守平,贺志文,王海东,等.上部结构与地基相对刚度比对土-结构体系基频影响试验研究[J].地震工程与工程振动,2008,28(5):94-101.
[16]王凤霞,何政,欧进萍.桩-土-结构动力相互作用的线弹性地震反应分析[J].世界地震工程,2003,19(2):58-66.
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