seismic retrofit of reinforced concrete frame buildings with hysteretic bracing systems: design procedure and behaviour factor

seismic retrofit of reinforced concrete frame buildings with hysteretic bracing systems: design procedure and behaviour factor

;Antonio Di Cesare;Felice Carlo Ponzo
Nano letters 2017 Vol. 2017 pp. -
101
cesare2017shockseismic

Abstract

This paper presents a design procedure to evaluate the mechanical characteristics of hysteretic Energy Dissipation Bracing (EDB) systems for seismic retrofitting of existing reinforced concrete framed buildings. The proposed procedure, aiming at controlling the maximum interstorey drifts, imposes a maximum top displacement as function of the seismic demand and, if needed, regularizes the stiffness and strength of the building along its elevation. In order to explain the application of the proposed procedure and its capacity to involve most of the devices in the energy dissipation with similar level of ductility demand, a simple benchmark structure has been studied and nonlinear dynamic analyses have been performed. A further goal of this work is to propose a simplified approach for designing dissipating systems based on linear analysis with the application of a suitable behaviour factor, in order to achieve a widespread adoption of the passive control techniques. At this goal, the increasing of the structural performances due to the addition of an EDB system designed with the above-mentioned procedure has been estimated considering one thousand case studies designed with different combinations of the main design parameters. An analytical formulation of the behaviour factor for braced buildings has been proposed.

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0x95644003c57E6F55A65596E3D9Eac6813e3566dA
Article ID:
146218
Unique Identifier:
10.1155/2017/2639361
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Scimatic Chain (ID: 481)
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