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Literature Review on Compatible Soil Structure Yielding

Literature Review on Compatible Soil Structure Yielding. by Weian Liu 2010-01-11. Literatures List. Seismic Response of base-isolated buildings including soil-structure interaction Sensitivity of Seismically isolated structures

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Literature Review on Compatible Soil Structure Yielding

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  1. Literature Review on Compatible Soil Structure Yielding by Weian Liu 2010-01-11

  2. Literatures List • Seismic Response of base-isolated buildings including soil-structure interaction • Sensitivity of Seismically isolated structures • Footing under seismic loading: Analysis and Design issues with emphasis on bridge foundations

  3. I. Seismic Response of base-isolated buildings including soil-structure interaction AUTHORS: C.C. Spyrakos , I.A.Koutromanos, Ch.A.Maniatakis AFFILIATION: Laboratory for Earthquake Engineering, School of Civil Engineering, National Technical University of Athens, Zografos, Athens 15700, Greece JOURNAL: Soil Dynamics and Earthquake Engineering (2009) vol. 29

  4. Objective • Investigates the effect of SSI on the response of base-isolated buildings • Performs parametric study involving the pertinent system parameters

  5. Main Content Soil Half-Space Fig. 1. Base-isolated structure found on soil half-space Fig. 2. Analytical model for base isolated structure including soil impedances. Note: All figures and images are adapted form its associated papers

  6. Main Content (cont’d) • Mathematical derivation of modal properties based on the equivalent 2-DOF system • Based on the derivations, perform parametric study

  7. Where, Vs is soil shear wave velocity; α is a characteristic length of the foundation; ρ is soil density is natural frequency of equivalent 2-DOF system Contribution: SSI effects are significant for relative stiff, squat structures with small mass ratio

  8. II. Sensitivity of Seismically Isolated Structures AUTHORS: IoannisPolitopoulos, and HoanKhac Pham AFFILIATION: Commissariat `a l’Energie Atomique/CEA Saclay, 91191 Gif-sur-Yvette, France JOURNAL: EARTHQUAKE ENGINEERING AND STRUCTURAL DYNAMICS (2009) vol. 38

  9. Objective • Study the sensitivity of seismically isolated structures to a small variability with respect to the probability of failure and floor spectra • The influence of superstructure nonlinearity is investigated by means of a series of Monte Carlo simulations of simple 2-DOF systems

  10. Main Content Nonlinear Behavior of isolation device and superstructure: Note: All figures and images are adapted form its associated papers

  11. Contribution: (Modeling)The precise cyclic behavior of the constitutive law is of no importance as far as the probability of failure is concerned. Failure probability for different constitutive laws of the superstructure

  12. Conclusion: The nonlinearity of the constitutive law of the superstructure does not have any significant impact on floor spectra of isolated structures

  13. III. Footings under seismic loading: Analysis and design issues with emphasis on bridge foundations AUTHORS: George Mylonakis, Sissy Nikolaou, George Gazetas AFFILIATION: University of Patras, Rio GR-26500, Greece Mueser Rutledge Consulting Engineers, USA National Technical University, Athens, Greece JOURNAL: Soil Dynamics and Earthquake Engineering (2006) vol. 26

  14. Objective Thoroughly present seismic analysis and design of spread footings supporting bridge piers: • Obtaining the dynamic stiffness of the foundation • To provide Simplified expressions for computing kinematic response (both in translation and rotation) • Determining the conditions under which foundation–soil compliance must be incorporated in dynamic structural analysis • Perform parametric studies on the seismic response of bridge bents on embedded footings

  15. Main Content Note: All figures and images are adapted form its associated papers

  16. Contributions • Procedure of how to obtain Foundation Input Motion (FIM) for a structural system • FIM will be smaller than the motion of free-field, resulting from rotational component. And significant for embedded foundations • Provide handy formulae and charts to refer dynamic impedances of foundation for a variety of soil conditions and foundation geometries • For shallow foundations, the coupling impedances are usually small and can be ignored

  17. REFERENCES • [1] C.C. Spyrakos , I.A.Koutromanos, Ch.A.Maniatakis. Seismic Response of base-isolated buildings including soil-structure interaction. Soil Dynamics and Earthquake Engineering (2009) vol. 29 • [2] IoannisPolitopoulos, and HoanKhac Pham. Sensitivity of Seismically isolated structures. EARTHQUAKE ENGINEERING AND STRUCTURAL DYNAMICS (2009) vol. 38 • [3] George Mylonakis, Sissy Nikolaou, George Gazetas. Footing under seismic loading: Analysis and Design issues with emphasis on bridge foundations. Soil Dynamics and Earthquake Engineering (2006) vol. 26

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