地下结构动力响应的复合参数识别研究
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摘要
在地下结构的动力分析中,通常将结构周围土体的约束简化为作用在结构上的弹簧和阻尼器,针对剪切型地下结构和一般多自由度地下结构分别提出了识别结构参数和周围土体附加参数的方法。通过建立系统的时域运动方程,剪切型模型结构的参数和其周围土体的附加参数可被同时识别;而对于一般的多节点有限元模型结构,则采用两阶段法识别。首先通过建立不含附加参数的运动方程来识别结构参数,然后把识别得到的结构参数代入到包含附加参数的运动方程来识别附加参数,最后通过数值算例说明了所提出的识别算法的可行性。
In the dynamic analysis of underground structure,the constraint to structures caused by the surrounding soil is often simulated by the virtual parameters,such as virtual mass,stiffness and damping parameters.Because of these virtual parameters,the model of underground structure is different from that of ground structure,which will cause traditional methods to fail in solving underground structure.Therefore,two approaches are presented— one method is applied to shear-type underground structure which can identify the structural parameters and virtual parameters at one step;and the other method which can be used to estimate common system with multi-degree freedoms by two step.In the first step,the structural parameters are identified;and in the second step,the virtual parameters can be estimated by using the structural parameters identified before.At last,a numerical example of shear-type building is applied;the results show the feasibility and efficiency of the method.
In the dynamic analysis of underground structure,the constraint to structures caused by the surrounding soil is often simulated by the virtual parameters,such as virtual mass,stiffness and damping parameters.Because of these virtual parameters,the model of underground structure is different from that of ground structure,which will cause traditional methods to fail in solving underground structure.Therefore,two approaches are presented— one method is applied to shear-type underground structure which can identify the structural parameters and virtual parameters at one step;and the other method which can be used to estimate common system with multi-degree freedoms by two step.In the first step,the structural parameters are identified;and in the second step,the virtual parameters can be estimated by using the structural parameters identified before.At last,a numerical example of shear-type building is applied;the results show the feasibility and efficiency of the method.
引文
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[2]陈健云,胡志强,林皋.大型地下结构三维地震响应特点研究[J].大连理工大学学报,2003,19(3):344–348.(Chen Jianyun,Hu Zhiqiang,Lin Gao.Study of 3D seismic response characteristics of large underground structures[J].Journal of Dalian University of Technology,2003,19(3):344–348.(in Chinese))
[3]陈隽,李杰.部分输入未知条件下的结构系统识别研究[J].地震工程与工程振动,1998,18(4):40–45.(Chen Jun,Li Jie.Study on structural system identification with incomplete input information[J].Earthquake Engineering and Engineering Vibration,1998,18(4):40–45.(in Chinese))
[4]李杰,陈隽.部分输入未知时求解动力复合反演问题的补偿算法[J].计算力学学报,2002,19(3):310–314.(Li Jie,Chen Jun.Compensation method for structural parameter identification with incomplete input information[J].Chinese Journal of Computational Mechanics,2002,19(3):310–314.(in Chinese))
[5]李杰,陈隽.输入未知条件下结构物理参数识别方法研究[J].计算力学学报,1999,16(1):32–40.(Li Jie,Chen Jun.Identification of structural parameters with unknown input[J].Chinese Journal of Computational Mechanics,1999,16(1):32–40.(in Chinese))
[6]李杰,陈隽.结构参数未知条件下的地震动反演研究[J].地震工程与工程振动,1999,17(3):27–32.(Li Jie,Chen Jun.Inversion of ground motion with unknown structural parameters[J].Earthquake Engineering and Engineering Vibration,1997,17(3):27–32.(in Chinese))
[7]Wang D,Halder A.Element-level system identification with unknown input[J].Journal of Engineering Mechanics,1994,120(1):159–176.
[8]Wang D,Halder A.System identification with limited observation and without input[J].Journal of Engineering Mechanics,1997,123(5):504–511.
[9]杨杰,耿遵敏,谭雪琴.基于复模态的结构有限元动态模型修正理论[J].振动与冲击,2002,12(1):30–32.(Yang Jie,Geng Zunmin,Tan Xueqin.A structure FEM dynamic modal modification based on complex mode theory[J].Journal of Vibration and Shock,2002,12(1):30–32.(in Chinese))
[10]姬亦工,王复明,栾茂田.粘弹性层状地基上板的动力响应及其参数识别方法[J].工程力学,2002,19(1):60–65.(Ji Yigong,Wang Fuming,Luan Maotian.Dynamic response analysis and parameter identification method of plates on layered viscoelastic half space foundation[J].Engineering Mechanics,2002,19(1):60–65.(in Chinese))
[11]刘增荣,邵江.集中剪切型系统的层间参数识别法[J].西北工业大学学报,2001,19(4):552–556.(Liu Zengrong,Shao Jiang.A building structure parameter identification method with less stringent requirements for initial parameters[J].Journal of Northwestern Polytechnical University,2001,19(4):552–556.(in Chinese))
[12]Yuna C B,Choia J S,Kimb J M.Identification of the Hualien soil-structure interaction system[J].Soil Dynamics and Earthquake Engineering,1999,18:395–408.
[13]Choi1J S,Lee J S,Yun C B.Input and system identification of the Hualien soil–structure interaction system using earthquake response data[J].Earthquake Engineering Structural Dynamics,2003,32:1 955–1 975.
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