On the European Norms of Design of Buckling Restrained Braced Frames

Abstract

Abstract:The application of buckling restrained braced frames is hindered in Europe by the absence of a standardized design procedure in Eurocode 8, the European seismic design standard. The presented research aims to develop a robust design procedure for buckling restrained braced frames. A design procedure is proposed by the authors. Its performance has been evaluated for buckling restrained braced frames with two-bay X-brace type brace configurations using a state-of-the-art methodology based on the recommendations in the FEMA P695 document. A special numerical material model was developed within the scope of this research to represent the behavior of buckling restrained braces more appropriately in a numerical environment. A total of 24 archetype designs were prepared and their nonlinear dynamic response was calculated using real ground motion records in incremental dynamic analyses. Evaluation of archetype collapse probabilities confirms that the proposed design procedure can utilize the advantageous behavior of buckling restrained braces. Resulting reliability indices suggest a need for additional regulations in the Eurocodes that introduce reasonable structural reliability index limits for seismic design.

Eurocode‐8‐conforming seismic design and behaviour factor of high‐post‐yield stiffness concentrically‐braced steel frames

“…Buckling-restrained braced frames (BRBFs) were introduced to dissipate energy through ductile yielding of both tensile and compressive braces to overcome the degradation drawback of conventional braces, [7][8][9][10][11][12] while they can be used for retrofitting purposes. [13][14][15] Buckling-restrained braces (BRBs) are characterised by nearly symmetric "full" hysteretic response and high energy dissipation capacity.…”

Nonlinear Behaviour, Design and Analysis of Steel Structures: Recent Findings and New Trends for the Next Generation of European Design Standards

“…In line with former studies carried out by those authors [25,26], the actual benefit of using high strength steel is quite limited for medium rise buildings. A very interesting paper on buckling restrained braces (BRBs) was presented by Zsarnóczay et al [27], which completes this thematic issue. Nowadays, BRBs are not yet codified in Europe.…”

Life cycle cost‐based optimization framework for seismic design and target safety quantification of dual steel buildings with buckling‐restrained braces

“…BRBs are modeled using the approach developed by Zsarnóczay and Vigh 130–132 . Although the cross‐section area of the BRB steel core varies along its length, each BRB is modeled by a single prismatic CorotTruss element connected to the working points in this approach.…”