Seismic Performance Assessment of Concentrically Braced Steel Frame Buildings

Abstract eng:
Three-story tall, model building systems are analyzed using OpenSEES to improve understanding of the behavior of conventionally braced and buckling restrained braced frames, and to identify improved performance-based design and analysis procedures. The analyses demonstrate that statistically, the three-story model building designed following 1997 NEHRP and that following ASCE 7-05 have similar performance in terms of the damage concentration. If the R value is reduced from 6 to 3, the demands on the braces and framing components are reduced as well as the tendency to form a soft story. However, stronger structure results in higher floor level accelerations, possibly creating greater falling hazards or increasing the costs of protecting nonstructural components and hazards. For the three-story BRBF model the tendency to form a soft story is less than SCBF. Nonetheless, the BRBF model has the largest residual drifts. A preliminary examination of floor level accelerations shows that the peak accelerations appear to be limited by the strength of the structure. The testing protocols are evaluated based on the analytical results, but further experiments are needed to verify the results. Based on the parametric study, four large-scale two-story braced frames with different brace types and different bracing configurations are designed to be tested in the University of California at Berkeley. Test results will be used to refine the analytical models and validate the seismic performance of SCBF and BRBF.

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