SSI体系阻尼特性振动台模型试验研究
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摘要
土与结构由于材性上的差异,其相互作用体系通常被认为是非经典阻尼体系。在振动台模型试验的基础上,研究软弱地基基础上的土-结构相互作用体系的阻尼特性问题。在递增的振动台模拟地震作用下,通过对模型体系不同部位测点的传递函数、自振频率、模态阻尼比等实测数据的对比,考察SSI体系合成模态、合成模态阻尼比的存在性及其动力非线性产生后的变化规律。结果表明,土-结构相互作用体系具有十分明显的经典阻尼特性,在SSI体系抗震设计方法中可以按经典阻尼体系考虑。
A system involving soil-structure interaction is often considered as a non-classical damping system due to distinctive differences between the material properties of soil and structure. An experimental investigation based on shaking table test is conducted to explore the actual damping behavior of soft soil-structure interaction system. Measurements of the transfer functions,the natural frequencies and the modal damping ratios of different parts of the system reveal the existence of composite mode and modal damping ratio along with nonlinear dynamic behavior of the soil-structure system under gradually increasing earthquake action. The experimental results indicate that the classical damping behavior is pronounced in soil-structure interaction system and seismic analysis can be performed by using classical damping theory.
A system involving soil-structure interaction is often considered as a non-classical damping system due to distinctive differences between the material properties of soil and structure. An experimental investigation based on shaking table test is conducted to explore the actual damping behavior of soft soil-structure interaction system. Measurements of the transfer functions,the natural frequencies and the modal damping ratios of different parts of the system reveal the existence of composite mode and modal damping ratio along with nonlinear dynamic behavior of the soil-structure system under gradually increasing earthquake action. The experimental results indicate that the classical damping behavior is pronounced in soil-structure interaction system and seismic analysis can be performed by using classical damping theory.
引文
[1]Sun C T,Bai J M.Vibration of multi-degree-of-freedom systems with non-proportional viscous damping[J].International Journal of Mechanical Sciences,1995,37(4):441-455
[2]Adhikari S,Woodhouse J.Identification of damping:part1,viscous damping[J].Journal of Sound and Vibration,2001,243(1):43-61
[3]李忠献,何玉敖.非经典阻尼结构动力分析模态综合法综述[J].工程力学,1992,9(1):51-59(Li Zhongxian,He Yuao.A summary of modal superposition methods of dynamic analysis for nonclassically damped structures[J].Engineering Mechanics,1992,9(1):51-59(in Chinese))
[4]徐涛,程飞,于澜,等.非经典阻尼系统的求解[J].吉林大学学报:工学版,2006,36(3):49-52(Xu Tao,Cheng Fei,Yu Lan,et al.Solution of non-classical damped system[J].Journal of Jilin University:Engineering and Technology Edition,2006,36(3):49-52(in Chinese))
[5]秦金旗,唐驾时.非经典阻尼系统的精确解[J].动力学与控制学报,2006,4(2):136-144(Qin Jinqi,Tang Jiashi.Exact solution of non-classical damping systems[J].Journal of Dynamics and Control,2006,4(2):136-144(in Chinese))
[6]桂国庆,何玉敖.非比例阻尼结构体系的动力分析方法[J].同济大学学报:自然科学版,1994,22(4):505-510(Gui Guoqing,He Yuao.Study on dynamic analysis methods for non-proportionally damped structural systems[J].Journal of Tongji University:Natural Science,1994,22(4):505-510(in Chinese))
[7]张国栋.非经典阻尼结构体系的动力分析方法[J].三峡大学学报:自然科学版,2004,26(2):144-146(Zhang Guodong.Dynamic analysis methods for nonclassical damping structural systems[J].Journal of China Three Gorges University:Natural Science,2004,26(2):144-146(in Chinese))
[8]黄东梅,李创第,陈俊忠,等.结构-土相互作用体系的地震作用取值———基于规范地震动模型的复模态时域法[J].振动工程学报,2006,19(4):571-577(Huang Dongmei,Li Chuangdi,Chen Junzhong,et al.Earthquake action calculation of structure-soil interaction system———according to complex mode method in time domain based on the earthquake model about seismic code[J].Journal of Vibration Engineering,2006,19(4):571-577(in Chinese))
[9]Aprile A,Benedetti A,Trombetti T.On non-linear dynamic analysis in the frequency domain:algorithms and applications[J].Earthquake Engineering and Structural Dynamics,1994,23(4):363-388
[10]Cortes F,Elejabarrieta M J.Computational methods for complex eigenproblems in finite element analysis of structural systems with viscoelastic damping treatments[J].Computer methods in applied mechanics and engineering,2006,195(44):6448-6462
[11]Caughey T K,O′Kelly M E J.Classical normal modes in damped linear dynamic system[J].Journal of Applied Mechanics,1965,32:583-588
[2]Adhikari S,Woodhouse J.Identification of damping:part1,viscous damping[J].Journal of Sound and Vibration,2001,243(1):43-61
[3]李忠献,何玉敖.非经典阻尼结构动力分析模态综合法综述[J].工程力学,1992,9(1):51-59(Li Zhongxian,He Yuao.A summary of modal superposition methods of dynamic analysis for nonclassically damped structures[J].Engineering Mechanics,1992,9(1):51-59(in Chinese))
[4]徐涛,程飞,于澜,等.非经典阻尼系统的求解[J].吉林大学学报:工学版,2006,36(3):49-52(Xu Tao,Cheng Fei,Yu Lan,et al.Solution of non-classical damped system[J].Journal of Jilin University:Engineering and Technology Edition,2006,36(3):49-52(in Chinese))
[5]秦金旗,唐驾时.非经典阻尼系统的精确解[J].动力学与控制学报,2006,4(2):136-144(Qin Jinqi,Tang Jiashi.Exact solution of non-classical damping systems[J].Journal of Dynamics and Control,2006,4(2):136-144(in Chinese))
[6]桂国庆,何玉敖.非比例阻尼结构体系的动力分析方法[J].同济大学学报:自然科学版,1994,22(4):505-510(Gui Guoqing,He Yuao.Study on dynamic analysis methods for non-proportionally damped structural systems[J].Journal of Tongji University:Natural Science,1994,22(4):505-510(in Chinese))
[7]张国栋.非经典阻尼结构体系的动力分析方法[J].三峡大学学报:自然科学版,2004,26(2):144-146(Zhang Guodong.Dynamic analysis methods for nonclassical damping structural systems[J].Journal of China Three Gorges University:Natural Science,2004,26(2):144-146(in Chinese))
[8]黄东梅,李创第,陈俊忠,等.结构-土相互作用体系的地震作用取值———基于规范地震动模型的复模态时域法[J].振动工程学报,2006,19(4):571-577(Huang Dongmei,Li Chuangdi,Chen Junzhong,et al.Earthquake action calculation of structure-soil interaction system———according to complex mode method in time domain based on the earthquake model about seismic code[J].Journal of Vibration Engineering,2006,19(4):571-577(in Chinese))
[9]Aprile A,Benedetti A,Trombetti T.On non-linear dynamic analysis in the frequency domain:algorithms and applications[J].Earthquake Engineering and Structural Dynamics,1994,23(4):363-388
[10]Cortes F,Elejabarrieta M J.Computational methods for complex eigenproblems in finite element analysis of structural systems with viscoelastic damping treatments[J].Computer methods in applied mechanics and engineering,2006,195(44):6448-6462
[11]Caughey T K,O′Kelly M E J.Classical normal modes in damped linear dynamic system[J].Journal of Applied Mechanics,1965,32:583-588
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