Techno Press

Steel and Composite Structures   Volume 20, Number 4, March20 2016, pages 749-776
Performance based design approach for multi-storey concentrically braced steel frames
Suhaib Salawdeh and Jamie Goggins

Abstract     [Full Text]
    In this paper, a Performance Based Design (PBD) approach is validated for multi-storey concentrically braced frame (CBF) systems. Direct Displacement Based Design (DDBD) procedure is used and validated by designing 4- and 12-storey CBF buildings. Nonlinear time history analysis (NLTHA) is used to check the performance of the design methodology by employing different accelerograms having displacement spectra matching the design displacement spectrum. Displacements and drifts obtained from NLTHA are found to fall within the design displacement limits used in the DDBD procedure. In NLTHA, both tension and compression members are found to be resisting the base shear, Fb, not only the tension members as assumed in the design methodology and suggested by Eurocode 8. This is the reason that the total Fb in NLTHA is found to be greater than the design shear forces. Furthermore, it is found that the average of the maximum ductility values recorded from the time history analyses for the 4-and 12-storey buildings are close to the design ductility obtained from the DDBD methodology and ductility expressions established by several researchers. Moreover, the DDBD is compared to the Forced Based Design (FBD) methodology for CBFs. The comparison is carried out by designing 4 and 12-storey CBF buildings using both DDBD and FBD methodologies. The performance for both methodologies is verified using NLTHA. It is found that the Fb from FBD is larger than Fb obtained from DDBD. This leads to the use of larger sections for the structure designed by FBD to resist the lateral forces.
Key Words
    codified approach; concentrically braced frames; design methodology; direct displacement based design; steel
(1) Suhaib Salawdeh, Jamie Goggins:
Civil Engineering, College of Engineering & Informatics, National University of Ireland, Galway, Ireland;
(2) Suhaib Salawdeh, Jamie Goggins:
Centre for Marine and Renewable Energy Ireland (MaREI), Galway, Ireland;
(3) Jamie Goggins:
Ryan Institute, Galway, Ireland.

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