Comparative parametric study on normal and buckling restrained steel braces

Student: Edison Ochoa Escudero
Supervisors: Prof. M. Nakashima



This study presents the results of parametric analyses performed on various frame models, characterizing the behavior and response of steel frames with braces under seismic action.

The focus of this study is the analysis of the deformation response of two different frames, using conventional braces with various slenderness ratios, and buckling restrained braces. The response of the frames is obtained by numerical simulation under the action of six strong ground motions, normalized to have the same levels of peak ground velocity. P-delta effects are taken into account during the simulation.

Statistical analyses are performed to characterize the responses, obtaining comparable results that allow the determination of the incidence of the various brace types and the additional parameters in the global behavior of the frame and its elements.

In the study, a review of the research conducted in Japan during the last 30 years is presented. Analytical and experimental results regarding the most significant papers on buckling restrained braces are exposed in the study. The analytical formulation corresponding to normal and buckling restrained braces is described in an simple manner, with a set of equations used for analysis and design. Conclusions on the frame response are presented in the final chapter of this study.

You may download a digital version of this MSc dissertation here.