An improved and innovative formulation for calculating amplified elastic story drift induced by RBS connections in steel moment frames. (September 2019)

• Record Type: Journal Article
• Authors: Fanaie, Nader; Faegh, Shervin Safaei; Partovi, Fatemeh
• Is Part Of: Journal of constructional steel research. Volume 160(2019)
• Page Start: 510
• Page End: 527
• Publication Date: 2019-09
• Subjects: Reduced beam section -- Steel moment frames -- Amplification factor of elastic story drift -- Response surface method -- Virtual work; Steel, Structural -- Periodicals; Building, Iron and steel -- Periodicals; Acier de construction -- Périodiques; Construction métallique -- Périodiques; 624.1821
• DOI: 10.1016/j.jcsr.2019.06.003
• Languages: English
• ISSNs: 0143-974X

Abstract

Abstract: In recent years, the prequalified rigid connections of radius-cut reduced beam section (RBS) have been widely used in the design and construction of steel moment frames. Despite extensive investigations performed on the seismic performance of RBS connections, there is little research into the impact of these connections upon the elastic story drift in steel moment frames. In the current study, a precise formulation (partially based on a previous research) has been developed so as to evaluate the amount of stiffness variation or amplified elastic drift introduced by radius-cut RBS connections in a story of steel moment frames. Herein, by defining a novel and accurate method along with the method of virtual work, the amplified elastic drift of a 2-dimensional one-story single-span moment frame due to utilizing radius-cut RBS connections is calculated. The reliability and accuracy of the presented approach are validated using finite element modeling of the moment frame. Sensitivity analyses are also conducted upon the RBS connection parameters to derive the most effective parameters on the amount of elastic drift in steel moment frames. Then, by employing a statistical approach called response surface method (RSM) and combining findings of this study with some premises considered in a previous research, rigorous amplification factor of elastic drift formulas based on utilizing each of IPE and HEA beams in a story (from the first to the last one) with RBS connections are developed. Ultimately, two simple, linear, and functional amplification factor of elastic story drift formulas for each set of IPE and HEA story beams with RBS connections are proposed for designers. The scope of these formulas will be expanded to plate girders as well. Highlights: Developing novel formulas for calculating amplification factor of elastic story drift in MRF with RBS connections. Using a simple but rigorous approach based on mathematical procedures alongside virtual work method. Validating the reliability and accuracy of the presented approach using finite element modeling of the moment frame. Performing sensitivity analyses on the RBS connection parameters. Employing response surface method (RSM) and proposing two distinct linear formulas for IPE and HEA beams.