土-结构动力相互作用体系阻尼及地震反应分析
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摘要
通过全面考虑土-结构动力相互作用体系中上部结构阻尼、地基土黏滞材料阻尼以及地基基础平动与转动时的辐射阻尼,推导了土-结构相互作用体系的耦合阻尼比公式。结合国内外关于阻尼调整系数的研究成果,提出了基于加速度反应谱的阻尼影响因子概念,建立阻尼影响因子η与《规范》中地震影响系数α的关系式。通过耦合阻尼比公式以及提出的η与α的关系式,对土-结构相互作用体系地震作用加以研究。结果表明考虑土与上部结构的相互作用后能够增大体系的阻尼性能,并大大降低上部结构的地震作用,提高体系的整体抗震性能。其成果为未来抗震防灾研究与工程的抗震设计提供了理论依据。
Through investigating the property of structure damping, material viscous damping of soil and the radiation damping of foundation considering translation and rocking, the coupling damping ratio and the damping reduction factor of the soil-structure- interaction system are deduced. Based on studying of the relationship between damping reduction factorη and seismic influence coefficient α , it is shown that it will improve the damping property and earthquake-resistant capability, and reduce the earthquake action of the SSI system, so as to provide a theoretical basis for the aseismatic researches and aseismic designs.
Through investigating the property of structure damping, material viscous damping of soil and the radiation damping of foundation considering translation and rocking, the coupling damping ratio and the damping reduction factor of the soil-structure- interaction system are deduced. Based on studying of the relationship between damping reduction factorη and seismic influence coefficient α , it is shown that it will improve the damping property and earthquake-resistant capability, and reduce the earthquake action of the SSI system, so as to provide a theoretical basis for the aseismatic researches and aseismic designs.
引文
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[11]尚守平,朱志辉,吴方伯.土-箱基-框架结构动力相互作用大比例模型野外试验研究[J].工程力学,2006,23(10):118-124.SHANG Shou-ping,ZHU Zhi-hui,WU Fang-bo.Large-scale field model test on dynamic soil–box foundation-structure interaction[J].Engineering Mechanics,2006,23(10):118-124.
[12]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,2003,6(19):58-66.WANG Feng-xia,HE Zheng,OU Jin-ping.The elastic seismic response analysis of pile-soil-structure interaction system[J].World Earthquake Engineering,2003,6(19):58-66.
[2]LEE I K,HARRISON H B.A theoretical study of the interaction of structure and foundation[J].J.Struct.Div,Proc.ASCE,1970,96:177-197.
[3]HUMAR J L,BAGCHI A,XIA H.Frequency domain analysis of soil-structure interaction[J].Computers and Structures,1998,66(2-3):337-351.
[4]JAVIER AVILES,MARTHA SUAREZ.Effective periods and dampings of building-foundation systems including seismic wave effects[J].Engineering Structures,2002,24:553-562.
[5]赵明华,刘建华,段少华.考虑基桩差异性及桩土共同工作的桩基承台梁内力分析[J].岩土力学,2006,27(12):2149-2153.ZHAO Ming-hua,LIU Jian-hua,DUAN Shao-hua.Inner force analysis of pile capping beam considering stiffness variance of pile and pile-soil interaction[J].Rock and Soil Mechanics,2006,27(12):2149-2153.
[6]杨明辉,赵明华,姚琪阳.碎石桩复合地基桩土应力比计算[J].湖南大学学报(自然科学版),2006,33(5):6-9.YANG Ming-hui,ZHAO Ming-hua,YAO Qi-yang.Calculation for pile-soil stress ratio in crush stone pile composition[J].Journal of Hunan University(Natural Sciences),2006,33(5):6-9.
[7]中国建筑科学院.GB50011-2001建筑抗震设计规范[S].北京:中国建筑工业出版社,2001.
[8]STEWART J P,SEEK R B,FENVES G L.Empirical evaluation of inertial soil-structure interaction effects[R].Report No.PEER-98/07,PEER-ctr,USA:University of California,Berkeley,1998.
[9]LIN Y Y,CHANG K C.Effects of site classes on damping reduction factors[J].Journal of Engineering Mechanics,ASCE,2004,130(11):1667-1675.
[10]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.CHEN Yue-qing,LüXi-lin,LI Pei-zhen.Comparative study on the dynamic soil-structure interaction system with various soils by using shaking table model tests[J].China Civil Engineering Journal,2006,39(5):58-64.
[11]尚守平,朱志辉,吴方伯.土-箱基-框架结构动力相互作用大比例模型野外试验研究[J].工程力学,2006,23(10):118-124.SHANG Shou-ping,ZHU Zhi-hui,WU Fang-bo.Large-scale field model test on dynamic soil–box foundation-structure interaction[J].Engineering Mechanics,2006,23(10):118-124.
[12]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,2003,6(19):58-66.WANG Feng-xia,HE Zheng,OU Jin-ping.The elastic seismic response analysis of pile-soil-structure interaction system[J].World Earthquake Engineering,2003,6(19):58-66.
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