PERFORMANCE-BASED DESIGN OF MID-RISE BUCKLING-RESTRAINED KNEE BRACED TRUSS MOMENT FRAMES
Keywords:
Performance-based plastic design, buckling-restrained brace, mid-rise buildings, soft-story mechanism, truss moment framesAbstract
This paper presents an application of a newly developed seismic resistant bucklingrestrainedknee braced truss moment frame (BRKB-TMF) structural system for mid-risebuildings. The design of this system is based on a design approach called the performancebasedplastic design (PBPD) method modified to account for the characteristics of mid-riseframes. The design focuses on eliminating damage concentration, particularly in the firststory. At the design state, the plastic strengths of the columns are carefully chosen toenhance the seismic behavior of a mid-rise building and to prevent a soft-story mechanism.The concept of the BRKB-TMF system is first described. The design and analysis of example mid-rise frames are then presented. A parametric study was carried out to find asuitable design approach for mid-rise frames. Nonlinear dynamic analyses were performed to investigate the response of the example frames. The analytical results illustrated thatmid-rise BRKB-TMFs can be designed to provide excellent seismic behavior under bothdesign basis earthquake and maximum considered earthquake intensities. The soft-storymechanism of the first story commonly found in mid-rise frames can be completelyeliminated. Moreover, concentration of interstory drift in any 1 story can also be reduced.
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