Journal of Structural and Construction Engineering

Journal of Structural and Construction Engineering

Performance Evaluation of Bolted Moment Frame with Reduced Beam Section

Document Type : Original Article

Authors
Mohammad-Amin Jalali 1
Amin Rafiee 2
1 Master of Science in Civil-Structural Engineering, Faculty of Engineering, University of Maragheh, Maragheh, Iran
2 Assistant Professor of Civil-Structural Engineering, Faculty of Engineering, University of Maragheh, Maragheh, Iran
10.22065/jsce.2023.393962.3098
Abstract
The lateral-torsional buckling of beam is a disadvantage for connections with reduced beam section (RBS). One effective method for preventing such buckling is to reduce web section (RWS) instead of flange. This, not only eliminates the disadvantage of RBS, but also, provides better behavior and more ductility. This paper investigates the effect of longitudinal and transverse web/flange slits on the behavior of bolted steel moment frames. The investigated frames include: frame with full beam section and frames with beams reduced by: radial cut in flange, longitudinal slits in flange, transverse slits in flange, longitudinal slits in web, transverse slits in web, mixed web slits, and, cruciform web slits. These one-story one-bay frames are analyzed using nonlinear finite-elements method with shell elements of type S4R and solid elements of type C3D8R in ABAQUS. The quasi-static cyclic loading according to Supplemental Access Control protocol is applied to the frames. The results show that by using RWS beams, the location of plastic hinge can move from column face to an appropriate distance at the reduction region. According to the results, the maximum rupture index (RI) occurs in frame with full (not reduced) section; while, the minimum RI belongs to RWS frame with longitudinal web slits. The larger the RI, the greater is the probability of rupture at low drifts. The hysteresis curves of frames show that the strength of frames with longitudinal or transverse flange slits decreases at final step of loading, i.e. at the last two cycles with greatest rotation angles. The frame with longitudinal web slits with 31.8% more load-carrying capacity and 30.9% more energy dissipation, shows better performance compared to the other RWS or RBS frames.
Keywords
Bolted moment frame
Reduced beam section
Cyclic loading
Nonlinear finite-elements
Ductility

Subjects

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  • Receive Date 28 April 2023
  • Revise Date 13 August 2023
  • Accept Date 03 September 2023