Journal Paper

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Journal: سازه و فولاد
Year:1393 | Volume:10 | Issue:15
Start Page:66 | End Page:80

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Title

COMPARISON OF SEISMIC PERFORMANCE OF BRB FRAMES AND YIELDING BRACE SYSTEMS

Pages

 Start Page 66 | End Page 80

Abstract

 Concentrically braced frames are among economical lateral resisting systems. However, due to brace buckling in severe earthquakes, these systems present a poor ductility and do not show appropriate seismic performance. One approach is to use BUCKLING RESTRAINED BRACES instead of ordinary braces to preclude buckling in compressive load. These braces consist of a ductile steel core, confined by a steel sleeve or a combined of steel sleeve and concrete filler, that tolerates the entire axial load of the brace and provides flexural, and buckling resistance. Another approach that is introduced recently is to add a Cast Steel Yielding Connector to the end of the braces. In addition to replaceability, this connector can absorb almost all the seismic energy and prevent compressive buckling that ensures tensile yielding in braces. Therefore, the yielding bracing system presents a stable hysteresis behavior. Although these braces are successfully fabricated and investigated experimentally, their seismic performance requires further research. This research investigates seismic performance of BRB frames and Yielding brace systems. For this reason, two groups of BRB and YBS frames are designed including 3, 5, 7, 10 and 12 story frames with chevron bracing configuration. Static nonlinear (pushover) and incremental dynamic analyses are carried out. Nonlinear program “OpenSEES” is employed for analyses. Finally ductility and over strength factor of frames are obtained. Also, seismic FRAGILITY CURVES of frames in IMMEDIATE OCCUPANCY and global instability limit states are calculated and compared. According to the analysis results, BRB frames present higher ductility factor while YBS frames show larger values of over strength factor. Also, yielding brace system promotes the seismic performance of the buildings in IMMEDIATE OCCUPANCY (IO) limit state. Utilization of these frames also can prevent developing soft story effect in short to medium buildings.

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