PERFORMANCE-BASED DESIGN OF MID-RISE BUCKLING-RESTRAINED KNEE BRACED TRUSS MOMENT FRAMES

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Publication Details

Author list: Wongpakdee, Nattapat;Leelataviwat, Sutat

Publication year: 2017

Journal: Suranaree Journal of Science and Technology (0858-849X)

Volume number: 24

Issue number: 4

Start page: 445

End page: 454

ISSN: 0858-849X

URL: http://ird.sut.ac.th/e-journal/Journal/pdf/180101176.pdf

Abstract

This paper presents an application of a newly developed seismic resistant bucklingrestrained knee braced truss moment frame (BRKB-TMF) structural system for mid-rise buildings. The design of this system is based on a design approach called the performancebased plastic design (PBPD) method modified to account for the characteristics of mid-rise frames. The design focuses on eliminating damage concentration, particularly in the first story. At the design state, the plastic strengths of the columns are carefully chosen to enhance 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 a suitable design approach for mid-rise frames. Nonlinear dynamic analyses were performed to investigate the response of the example frames. The analytical results illustrated that mid-rise BRKB-TMFs can be designed to provide excellent seismic behavior under both design basis earthquake and maximum considered earthquake intensities. The soft-story mechanism of the first story commonly found in mid-rise frames can be completely eliminated. Moreover, concentration of interstory drift in any 1 story can also be reduced.

Keywords

Buckling-restrained brace, mid-rise buildings, soft-story mechanism, Truss moment frames