Comparative seismic performance of steel frames retrofitted with buckling-restrained braces through the application of force-based and displacement-based …

A Terán-Gilmore, J Ruiz-García - Soil Dynamics and Earthquake …, 2011 - Elsevier
Soil Dynamics and Earthquake Engineering, 2011Elsevier
This paper presents an analytical study aimed at evaluating the feasibility of using buckling-
restrained braces as a retrofit scheme for existing multi-bay multi-story steel buildings. For
that purpose, the seismic response of four two-dimensional frame models representative of
typical steel buildings designed in a region of high seismicity was analyzed prior to and after
including buckling-restrained braces as a retrofit strategy. The braces were designed
following Force-Based and Displacement-Based approaches. The structural performance of …
This paper presents an analytical study aimed at evaluating the feasibility of using buckling-restrained braces as a retrofit scheme for existing multi-bay multi-story steel buildings. For that purpose, the seismic response of four two-dimensional frame models representative of typical steel buildings designed in a region of high seismicity was analyzed prior to and after including buckling-restrained braces as a retrofit strategy. The braces were designed following Force-Based and Displacement-Based approaches. The structural performance of the different versions of the frames was evaluated by subjecting each one to a set of twenty ground motions representative of the design earthquake with 10% exceedance probability in fifty years. It was observed that buckling-restrained braces allow for an efficient reduction in the peak drift demands in the retrofitted frames. However, since the beneficial effect of the braces cannot be fully controlled under a Force-Based design approach, it was concluded that a Displacement-Based design approach is the best option to achieve optimum structural performance.
Elsevier
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