Hysteretic behavior of moment-resisting frames considering slab restraint and framing action
Hysteretic behavior of moment-resisting frames considering slab restraint and framing action
This paper examines the influence of framing action and slab continuity on the hysteretic behavior of composite steel momentresisting frames (MRFs) by means of high-fidelity continuum finite-element (CFE) analyses of two-bay subsystems and typical cruciform subassemblies. The CFE model, which is made publicly available, was thoroughly validated with available full-scale experiments and considers variations in the beam depth and the imposed loading history. The simulation results suggest that beams in subsystems may experience up to 25% less flexural strength degradation than those in typical subassemblies. This is because of local buckling straightening from the slab continuity and framing action evident in subsystems. For the same reason, beam axial shortening attributable to local buckling progression is up to five times lower in subsystems than in subassemblies, which is consistent with field observations. While the hysteretic behavior of interior panel zone joints is symmetric, exterior joint panel zones in subsystems experience large asymmetric shear distortions regardless of the employed lateral loading history. From a design standpoint, it is found that the probable maximum moment in deep and slender beams (db ≥ 700 mm) may be up to 25% higher than that predicted by current design provisions with direct implications to capacity design of steel MRFs. The 25% reduction in the shear stud capacity as proposed by current seismic provisions is not imperative for MRFs comprising intermediate to shallow beams and/or featuring a high degree of composite action (η > 80%) as long as ductile shear connectors are
employed.
Composite steel moment-resisting frames, Continuum finite-element analysis, Cyclic deterioration, Frame continuity, Lateral load protocol, Panel zone shear distortion, Shear stud behavior, Slab restraint
El Jisr, Hammad
63bbff5a-a762-4185-baf1-8e548141c955
Elkady, Ahmed
8e55de89-dff4-4f84-90ed-6af476e328a8
Lignos, Dimitros G.
b8901aaa-40cf-4737-a81c-1d079cad22ab
1 August 2020
El Jisr, Hammad
63bbff5a-a762-4185-baf1-8e548141c955
Elkady, Ahmed
8e55de89-dff4-4f84-90ed-6af476e328a8
Lignos, Dimitros G.
b8901aaa-40cf-4737-a81c-1d079cad22ab
El Jisr, Hammad, Elkady, Ahmed and Lignos, Dimitros G.
(2020)
Hysteretic behavior of moment-resisting frames considering slab restraint and framing action.
Journal of Structural Engineering, 146 (8), [04020145].
(doi:10.1061/(ASCE)ST.1943-541X.0002696).
Abstract
This paper examines the influence of framing action and slab continuity on the hysteretic behavior of composite steel momentresisting frames (MRFs) by means of high-fidelity continuum finite-element (CFE) analyses of two-bay subsystems and typical cruciform subassemblies. The CFE model, which is made publicly available, was thoroughly validated with available full-scale experiments and considers variations in the beam depth and the imposed loading history. The simulation results suggest that beams in subsystems may experience up to 25% less flexural strength degradation than those in typical subassemblies. This is because of local buckling straightening from the slab continuity and framing action evident in subsystems. For the same reason, beam axial shortening attributable to local buckling progression is up to five times lower in subsystems than in subassemblies, which is consistent with field observations. While the hysteretic behavior of interior panel zone joints is symmetric, exterior joint panel zones in subsystems experience large asymmetric shear distortions regardless of the employed lateral loading history. From a design standpoint, it is found that the probable maximum moment in deep and slender beams (db ≥ 700 mm) may be up to 25% higher than that predicted by current design provisions with direct implications to capacity design of steel MRFs. The 25% reduction in the shear stud capacity as proposed by current seismic provisions is not imperative for MRFs comprising intermediate to shallow beams and/or featuring a high degree of composite action (η > 80%) as long as ductile shear connectors are
employed.
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preprint
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More information
Accepted/In Press date: 6 February 2020
e-pub ahead of print date: 21 May 2020
Published date: 1 August 2020
Additional Information:
Funding Information:
This study is based on work supported by the Swiss National Science Foundation (Project No. 200021_169248). The financial support is gratefully acknowledged. Any opinions expressed in the paper are those of the authors and do not necessarily reflect the views of sponsors.
Publisher Copyright:
© 2020 American Society of Civil Engineers.
Keywords:
Composite steel moment-resisting frames, Continuum finite-element analysis, Cyclic deterioration, Frame continuity, Lateral load protocol, Panel zone shear distortion, Shear stud behavior, Slab restraint
Identifiers
Local EPrints ID: 441079
URI: http://eprints.soton.ac.uk/id/eprint/441079
ISSN: 0733-9445
PURE UUID: 40c18c3e-28bf-414c-abb9-eafd2f54b2d4
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Date deposited: 29 May 2020 16:30
Last modified: 17 Mar 2024 03:57
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Author:
Hammad El Jisr
Author:
Dimitros G. Lignos
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