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Constantine C. Spyrakos - One of the best experts on this subject based on the ideXlab platform.

  • Seismically isolated bridge piers on shallow soil stratum with soil–structure Interaction
    Computers & Structures, 2001
    Co-Authors: A. G. Vlassis, Constantine C. Spyrakos
    Abstract:

    Abstract The objective of this study is to assess the effects of soil–structure Interaction on the response of seismically isolated bridge piers founded on a shallow soil stratum overlying a rigid bedrock and to develop a method that considers soil–structure Interaction and can be easily applied to the preliminary design of bridges. The relative importance of several parameters of the bridge-isolators-soil system is examined. Cases in which soil–structure Interaction needs to be incorporated in seismically isolated bridge design are identified and ways to take advantage of soil–structure Interaction in order to enhance the safety level and reduce design costs are recommended.

Reza Rahgozar - One of the best experts on this subject based on the ideXlab platform.

  • Seismic performance of outrigger–belt truss system considering soil–structure Interaction
    International Journal of Advanced Structural Engineering, 2019
    Co-Authors: Reihaneh Tavakoli, Reza Kamgar, Reza Rahgozar
    Abstract:

    The focus of this study is to investigate the seismic behavior of outrigger-braced building considering the soil–structure Interaction based on finding the best location of outrigger and belt truss system. For this purpose, a central outrigger-braced frame of a steel tall building is considered. A layered soil deposit underlied this frame and the resulting soil–structure system is subjected to seismic excitation. To analyze this system, direct method is employed in OpenSees. Also, elastic and in-elastic analyses are both considered and a comparison is made between current results and the results related to the system with fixed base. The best location of outrigger–belt truss system is determined by considering the maximum roof displacement, base moment and base shear with and without soil–structure Interaction. It is shown that considering SSI affects the location of outrigger–belt truss system. Elastic analysis of both systems, namely with fixed base and with soil–structure Interaction, showed that locating the belt truss at higher stories caused lower amounts of roof displacement.

  • seismic performance of outrigger belt truss system considering soil structure Interaction
    International Journal of Advanced Structural Engineering, 2019
    Co-Authors: Reihaneh Tavakoli, Reza Kamgar, Reza Rahgozar
    Abstract:

    The focus of this study is to investigate the seismic behavior of outrigger-braced building considering the soil–structure Interaction based on finding the best location of outrigger and belt truss system. For this purpose, a central outrigger-braced frame of a steel tall building is considered. A layered soil deposit underlied this frame and the resulting soil–structure system is subjected to seismic excitation. To analyze this system, direct method is employed in OpenSees. Also, elastic and in-elastic analyses are both considered and a comparison is made between current results and the results related to the system with fixed base. The best location of outrigger–belt truss system is determined by considering the maximum roof displacement, base moment and base shear with and without soil–structure Interaction. It is shown that considering SSI affects the location of outrigger–belt truss system. Elastic analysis of both systems, namely with fixed base and with soil–structure Interaction, showed that locating the belt truss at higher stories caused lower amounts of roof displacement.

Nikos D. Lagaros - One of the best experts on this subject based on the ideXlab platform.

  • Influence of Soil-Structure Interaction on fragility assessment of building structures
    Structures, 2016
    Co-Authors: Chara Ch. Mitropoulou, Christos Kostopanagiotis, Markos Kopanos, Dennis Ioakim, Nikos D. Lagaros
    Abstract:

    Abstract In this work, 3D reinforced concrete (RC) and steel building structures have been considered for studying the effect of soil–structure Interaction modelling on the structural fragility assessment of such structures. In particular, three foundation models were considered: fixed model where soil–structure Interaction is neglected, spring model with single-node Winkler springs and pile foundation model where soil–structure Interaction is simulated using beam and quadrilateral finite elements for the pile and soil numerical simulation, respectively. For the assessment of the structural performance and the influence of the various soil–structure Interaction numerical simulation models, fragility analysis is applied by considering four limit-states. For the purpose of the current study 3D, low-, mid- and high-rise RC and steel buildings are studied. The test examples employed in this study were designed first according to Eurocodes 2, 3 and 8 using the SCADA Pro analysis and design software and then nonlinear static analyses were performed for developing the fragility curves. Comparing the outcome of fragility analysis it was observed that for the case of the low- and mid-rise buildings, the structural performance was not affected significantly by the foundation system. However, it was observed that the foundation system contributes considerably to the overall structural performance of the high-rise structures examined.

J. Enrique Luco - One of the best experts on this subject based on the ideXlab platform.

  • Effects of soil–structure Interaction on seismic base isolation
    Soil Dynamics and Earthquake Engineering, 2014
    Co-Authors: J. Enrique Luco
    Abstract:

    Abstract The effects of soil–structure Interaction on the performance of a nonlinear seismic base isolation system for a simple elastic structure are examined. The steady-state response of the system to harmonic excitation is obtained by use of the equivalent linearization method. Simple analytical expressions for the deformation of the base isolation system and of the superstructure at resonance are obtained in terms of an effective replacement oscillator characterized by amplitude-dependent frequency, damping ratio, and excitation. Numerical results suggest that the seismic response of a structure resting on an inelastic base isolation system may be larger when the flexibility of the soil is considered than the corresponding response obtained by ignoring the effects of soil–structure Interaction. It is shown that, in the undamped case and in the absence of soil–structure Interaction effects, a critical harmonic excitation exists beyond which the steady-state resonant response of the isolators and structure become unbounded.

  • A simple model for structural control including soil–structure Interaction effects
    Earthquake Engineering & Structural Dynamics, 1998
    Co-Authors: J. Enrique Luco
    Abstract:

    A simple model for the seismic response of a one-storey structure subjected to active control in the presence of soil–structure Interaction effects is presented. The approach is based on the successive use of equivalent 1-DOF oscillators which account for the effects of control and soil–structure Interaction. Simple expressions for these oscillators based on exact analytical solutions of the control equations and approximate solutions of the Interaction equations are presented. The study includes an evaluation of the effects of soil–structure Interaction on the seismic response of actively controlled structures in which the control gains have been determined with and without inclusion of soil–structure Interaction effects. A simple procedure to include the Interaction effects on the control gains is also presented. © 1998 John Wiley & Sons, Ltd.

A. G. Vlassis - One of the best experts on this subject based on the ideXlab platform.

  • Seismically isolated bridge piers on shallow soil stratum with soil–structure Interaction
    Computers & Structures, 2001
    Co-Authors: A. G. Vlassis, Constantine C. Spyrakos
    Abstract:

    Abstract The objective of this study is to assess the effects of soil–structure Interaction on the response of seismically isolated bridge piers founded on a shallow soil stratum overlying a rigid bedrock and to develop a method that considers soil–structure Interaction and can be easily applied to the preliminary design of bridges. The relative importance of several parameters of the bridge-isolators-soil system is examined. Cases in which soil–structure Interaction needs to be incorporated in seismically isolated bridge design are identified and ways to take advantage of soil–structure Interaction in order to enhance the safety level and reduce design costs are recommended.