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Earthquakes and Structures
  Volume 12, Number 4, April 2017, pages 469-478

On the seismic response of steel buckling-restrained braced structures including soil-structure interaction
Antonios K. Flogeras and George A. Papagiannopoulos

    This paper summarizes estimated seismic response results from three-dimensional nonlinear inelastic time-history analyses of some steel buckling-restrained braced (BRB) structures taking into account soil-structure interaction (SSI). The response results involve mean values for peak interstorey drift ratios, peak interstorey residual drift ratios and peak floor accelerations. Moreover, mean seismic demands in terms of axial force and rotation in columns, of axial and shear forces and bending moment in BRB beams and of axial displacement in BRBs are also discussed. For comparison purposes, three separate configurations of the BRBs have been considered and the aforementioned seismic response and demands results have been obtained firstly by considering SSI effects and then by neglecting them. It is concluded that SSI, when considered, may lead to larger interstorey and residual interstorey drifts than when not. These drifts did not cause failure of columns and of the BRBs. However, the BRB beam may fail due to flexure.
Key Words
    buckling-restrained braces; seismic response; soil-structure interaction; three-dimensional steel structures
Antonios K. Flogeras: Engineer Consultant, Zakinthou 34, GR-26441 Patras, Greece

George A. Papagiannopoulos: Department of Civil Engineering, University of Patras, GR-26504 Patras, Greece

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