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Cyclic Performance of Cold‐formed Steel Moment Resisting Frames
Author(s) -
McCrum Daniel P.,
Wrzesien Andrzej M.,
Simon Jordan,
Grimes Michael,
Broderick Brian,
Lim James B.P.
Publication year - 2021
Publication title -
ce/papers
Language(s) - English
Resource type - Journals
ISSN - 2509-7075
DOI - 10.1002/cepa.1493
Subject(s) - structural engineering , dissipation , ductility (earth science) , moment (physics) , strain gauge , hysteresis , materials science , bending moment , portal frame , cold forming , frame (networking) , engineering , composite material , physics , classical mechanics , mechanical engineering , creep , quantum mechanics , thermodynamics
This paper investigates the seismic performance of a single storey moment resisting cold‐formed steel (CFS) portal frame through cyclic testing. Six monotonic and six cyclic tests were performed on three different section sizes of CFS portal frames. The portal frames were 3.2m long x 2.2m high and the CFS sections bolted with either perfect‐fit tolerance bolt holes (PTBH) or normal tolerance bolt holes (NTBH) connections. Connections with NTBH are standard in CFS, but connections with PTBH are often only used for short‐spanning frames. Results from the tests demonstrated that both PTBH and NTBH connections had stable hysteresis and good hysteretic energy dissipation capacity and ductility. On average, the NTBH connections performed better under cyclic loading in comparison to the PTBH connections (5.4% larger ductility and 22.3% increased energy dissipation). Strain gauge results show failure due to combined bending and bi‐moment stresses, of which the bi‐moment stress component accounted for 41% of the total longitudinal stresses at the section web. It should be noted that bi‐moment stresses are often incorrectly ignored by practitioners; the experimental test results thus show that by doing so the sections would fail at 59% of the design moment.