Performance-based plastic design method for steel concentric braced frames

• Published in: International journal of advanced structural engineering Vol. 7; no. 3; pp. 281 - 293
• Main Authors: Banihashemi, M. R., Mirzagoltabar, A. R., Tavakoli, H. R.
• Format: Journal Article
• Language: English
• Published: Berlin/Heidelberg Springer Berlin Heidelberg 01.09.2015; Islamic Azad University, South Tehran Branch
• Subjects: Building Construction and Design; Civil Engineering; Control; Dynamical Systems; Engineering; Engineering Design; Original Research; Solid Mechanics; Vibration; Steel concentric brace frame; Performance based plastic design; Nonlinear dynamic analyses; Energy–work balance equation
• ISSN: 2008-3556; 2008-6695
• DOI: 10.1007/s40091-015-0099-0

This paper presents a performance-based plastic design (PBPD) methodology for the design of steel concentric braced frames. The design base shear is obtained based on energy–work balance equation using pre-selected target drift and yield mechanism. To achieve the intended yield mechanism and behavior, plastic design is applied to detail the frame members. For validity, three baseline frames (3, 6, 9-story) are designed according to AISC (Seismic Provisions for Structural Steel Buildings, American Institute of Steel Construction, Chicago, 2005) seismic provisions (baseline frames). Then, the frames are redesigned based on the PBPD method. These frames are subjected to extensive nonlinear dynamic time-history analyses. The results show that the PBPD frames meet all the intended performance objectives in terms of yield mechanisms and target drifts, whereas the baseline frames show very poor response due to premature brace fractures leading to unacceptably large drifts and instability.