Earthquakes and Structures

Journal Information
ISSN : 2092-7614
Published by: Techno-Press (10.12989)
Total articles ≅ 563
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, , Christoph Butenweg, Valerio Alecci, Mario De Stefano
Published: 25 April 2017
Earthquakes and Structures, Volume 12, pp 409-423; https://doi.org/10.12989/eas.2017.12.4.409

A.R. Vijayanarayanan, Rupen Goswami, C.V.R. Murty
Published: 25 April 2017
Earthquakes and Structures, Volume 12, pp 437-448; https://doi.org/10.12989/eas.2017.12.4.437

Abstract:
Identifying stiffness irregularity in buildings using fundamental lateral mode shape modal analysis;mass participation;open storey;soft storey;storey stiffness; Soft or extreme soft storeys in multi-storied buildings cause localized damage (and even collapse) during strong earthquake shaking. The presence of such soft or extremely soft storey is identified through provisions of vertical stiffness irregularity in seismic design codes. Identification of the irregularity in a building requires estimation of lateral translational stiffness of each storey. Estimation of lateral translational stiffness can be an arduous task. A simple procedure is presented to estimate storey stiffness using only properties of fundamental lateral translational mode of oscillation (namely natural period and associated mode shape), which are readily available to designers at the end of analysis stage. In addition, simplified analytical expressions are provided towards identifying stiffness irregularity. Results of linear elastic time-history analyses indicate that the proposed procedure captures the irregularity in storey stiffness in both low- and mid-rise buildings.
Antonios K. Flogeras,
Published: 25 April 2017
Earthquakes and Structures, Volume 12, pp 469-478; https://doi.org/10.12989/eas.2017.12.4.469

Abstract:
On the seismic response of steel buckling-restrained braced structures including soil-structure interaction buckling-restrained braces;seismic response;soil-structure interaction;three-dimensional steel structures; 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.
Dumitru Beilic, Chiara Casotto, Roberto Nascimbene, Daniele Cicola, Daniela Rodrigues
Published: 25 March 2017
Earthquakes and Structures, Volume 12, pp 359-374; https://doi.org/10.12989/eas.2017.12.3.359

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