Comparison of Seismic Performance of Buckling Restrained Braced Frames in Usa and Chile

Abstract eng:
Buckling restrained braced frames (BRBFs) are slowly being introduced in Chile, considering their advantages over conventional concentrically braced frames (CBFs). However, they are not included in Chilean seismic design codes yet. The seismic performance of a buckling restrained braced frame is studied for a 9-story office prototype building structure designed under Chilean standards. The structure is located in the central coast zone of the country, a seismic region dominated by large subduction earthquakes. The resulting building is modeled considering the relevant nonlinearities of the problem and the model is subjected to nonlinear static pushover and dynamic time-history analyses, using several ground motion records from the last ten years. The performance of the prototype is studied in terms of base shear, story drift, importance of second order effects, and likelihood of collapse. An analogous procedure is followed for a buckling restrained braced frame for the same prototype building located in the United States, in an area with similar seismic conditions. This structure is designed under provisions in the U.S. and it is subjected to static pushover analysis as a simple point of comparison. Pushover results show a high ductility response of the structure, but with limited overstrength. Time-history analysis results for the Chilean prototype indicate that with the current seismic code, the structure exhibits an adequate performance and it has significant reserve capacity.

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