考虑土-结构动力相互作用效应的界限研究
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摘要
开展了土-结构动力相互作用的模型试验,探讨了框架结构的近似有效基本周期,并研究了考虑相互作用效应的界限。模型试验中分别进行了刚性地基和柔性地基条件下的结构基本周期测试,并通过与理论计算结果的比较,验证了FEMA450中建议的有效基本周期计算方法能够有效预测土-结构相互作用效应的影响。利用FEMA450中建议的刚性地基上普通钢筋混凝土框架结构基本周期近似值的计算式,分别建立了明置基础、埋置基础的框架结构有效基本周期近似值的计算式,并以此分析了框架结构考虑相互作用的界限问题,提出了考虑埋置深度影响的合理界限。
This paper includes an investigation on a model test for dynamic soil-structure interaction,the approximate effective fundamental period and the limit of considering the dynamic soil-structure interaction.A frame model test with fixed-base and flexible-base is presented,and the approaches proposed in FEMA450 can reliably predict the influence of soil-structure interaction on fundamental period by comparing the test results and the calculated results.By using the approximate fundamental period of frame structure with fixed-base proposed in FEMA450,the methods of the approximate effective fundamental period are developed for foundations supported at the surface and embedded foundations,respectively.Then the limit of considering the dynamic soil-structure interaction is discussed,the effect of the depth of embedment is taken into account,and the rational limits are proposed.
This paper includes an investigation on a model test for dynamic soil-structure interaction,the approximate effective fundamental period and the limit of considering the dynamic soil-structure interaction.A frame model test with fixed-base and flexible-base is presented,and the approaches proposed in FEMA450 can reliably predict the influence of soil-structure interaction on fundamental period by comparing the test results and the calculated results.By using the approximate fundamental period of frame structure with fixed-base proposed in FEMA450,the methods of the approximate effective fundamental period are developed for foundations supported at the surface and embedded foundations,respectively.Then the limit of considering the dynamic soil-structure interaction is discussed,the effect of the depth of embedment is taken into account,and the rational limits are proposed.
引文
[1]Mylonakis G,Gazetas G.Seismic soil-structure interaction:beneficial or detrimental?[J].Journal of Earthquake Engineering,2000,4(3):227-301.
[2]Veletsos A S,Meek J W.Dynamic behavior of building-foundation systems[J].Earthquake Engineering and Structural Dynamics,1974,3(2):121-138.
[3]Veletsos A S,Nair V V.Seismic interaction of structures on hysteretic foundations[J].Journal of Structural Engineering(ASCE),1975,101(1):109-129.
[4]Bielak J.Dynamic behavior of structures with embedded foundations[J].Earthquake Engineering and Structural Dynamics,1975,3(3):259-74.
[5]Setwart J P,Seed R B,and Fenves G L.Seismic soil-structure interaction in buildings II:empirical findings[J].Journal of Geotechnical andGeoenvironmental Engineering(ASCE),1999,125(1):38-48.
[6]Veletsos A S.Dynamics of structure-foundation systems[M]//W.J.Hall.Structural and Geotechnical Mechanics,Englewood Cliffs,NJ:Pren-tice-Hall Inc,1977.
[7]Khalil L,Sadek M,Shahrour I.Influence of the soil-structure interaction on the fundamental period of buildings[J].Earthquake Engineeringand Structural Dynamics,2007,36:2445-2453.
[8]周昌年,俞载道.高层建筑物与地基土共同作用体系的动力特性和地震响应[J].同济大学学报,1982(4):39-49.
[9]俞载道,傅公康.桩-土-高层框剪结构动力相互作用分析[J].同济大学学报,1984(1):66-79.
[10]Building Seismic Safety Council,Federal Emergency Management Agency,National Earthquake Hazards Reduction Program.NEHRP Recommen-ded Provisions for Seismic Regulations for New Buildings and Other Structures(FEMA450),Part 1:Provisions,(2003 ed)[S].Washington,D.C.:Building Seismic Safety Council,2004.
[11]Building Seismic Safety Council,Federal Emergency Management Agency,and National Earthquake Hazards Reduction Program.NEHRP Rec-ommended Provisions for Seismic Regulations for New Buildings and Other Structures(FEMA450),Part 2:Commentary,(2003 ed)[S].Washington,D.C.:Building Seismic Safety Council,2004.
[12]刘方成.土-结构动力相互作用非线性分析及基于SSI效应的结构隔震研究[D].长沙:湖南大学,2008.
[13]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.
[14]Javier A,Luis E.Evaluation of interaction effects on the system period and the system damping due to foundation embedment and layer depth[J].Soil Dynamics and Earthquake Engineering,1996,(15):11-27.
[2]Veletsos A S,Meek J W.Dynamic behavior of building-foundation systems[J].Earthquake Engineering and Structural Dynamics,1974,3(2):121-138.
[3]Veletsos A S,Nair V V.Seismic interaction of structures on hysteretic foundations[J].Journal of Structural Engineering(ASCE),1975,101(1):109-129.
[4]Bielak J.Dynamic behavior of structures with embedded foundations[J].Earthquake Engineering and Structural Dynamics,1975,3(3):259-74.
[5]Setwart J P,Seed R B,and Fenves G L.Seismic soil-structure interaction in buildings II:empirical findings[J].Journal of Geotechnical andGeoenvironmental Engineering(ASCE),1999,125(1):38-48.
[6]Veletsos A S.Dynamics of structure-foundation systems[M]//W.J.Hall.Structural and Geotechnical Mechanics,Englewood Cliffs,NJ:Pren-tice-Hall Inc,1977.
[7]Khalil L,Sadek M,Shahrour I.Influence of the soil-structure interaction on the fundamental period of buildings[J].Earthquake Engineeringand Structural Dynamics,2007,36:2445-2453.
[8]周昌年,俞载道.高层建筑物与地基土共同作用体系的动力特性和地震响应[J].同济大学学报,1982(4):39-49.
[9]俞载道,傅公康.桩-土-高层框剪结构动力相互作用分析[J].同济大学学报,1984(1):66-79.
[10]Building Seismic Safety Council,Federal Emergency Management Agency,National Earthquake Hazards Reduction Program.NEHRP Recommen-ded Provisions for Seismic Regulations for New Buildings and Other Structures(FEMA450),Part 1:Provisions,(2003 ed)[S].Washington,D.C.:Building Seismic Safety Council,2004.
[11]Building Seismic Safety Council,Federal Emergency Management Agency,and National Earthquake Hazards Reduction Program.NEHRP Rec-ommended Provisions for Seismic Regulations for New Buildings and Other Structures(FEMA450),Part 2:Commentary,(2003 ed)[S].Washington,D.C.:Building Seismic Safety Council,2004.
[12]刘方成.土-结构动力相互作用非线性分析及基于SSI效应的结构隔震研究[D].长沙:湖南大学,2008.
[13]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.
[14]Javier A,Luis E.Evaluation of interaction effects on the system period and the system damping due to foundation embedment and layer depth[J].Soil Dynamics and Earthquake Engineering,1996,(15):11-27.
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