Vol. 11, No. 2, 2016

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ISSN: 1559-3959
Analytical estimates for the lateral thrust in bolted steel buckling-restrained braces

Guido Bregoli, Francesco Genna and Giovanni Metelli

Vol. 11 (2016), No. 2, 173–196
Abstract

Analytical expressions are developed for the lateral thrust exerted by the core of a buckling-restrained brace (BRB), when, upon a prescribed axial loading history, it buckles, coming into contact with the external retaining structure. Account is taken of (i) the elastic stiffness of the containment case; (ii) the possible flattened shape of each buckled wave in the zones of contact with the containment profiles; and (iii) the increase in the lateral thrust due to loading-unloading in the presence of linear kinematic hardening. Comparisons with both experimental and numerical results confirm the effectiveness of the analytical predictions. The proposed calculation techniques for the lateral thrust might be of help in the design procedures of BRBs.

Keywords
buckling-restrained braces, elastic-plastic buckling, unilateral contact, lateral thrust, restraining member design
Milestones
Received: 6 October 2015
Revised: 17 November 2015
Accepted: 24 November 2015
Published: 23 February 2016
Authors
Guido Bregoli
Department of Civil Engineering
University of Brescia
Via Branze, 43
I-25123 Brescia
Italy
Francesco Genna
Department of Civil Engineering
University of Brescia
Via Branze 43
I-25123 Brescia
Italy
Giovanni Metelli
Department of Civil Engineering
University of Brescia
Via Branze, 43
I-25123 Brescia
Italy