A numerical study on degradation of steel I-section beams

Date

2023-7-4

Author

Karagümüş, Anıl

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Local buckling is detrimental to seismic performance of steel I-beams in moment resisting frames (MRFs). Although limits of local buckling in these beams and the beams’ rotation capacities were investigated in previous studies, none of them had attempted to delay the degradation due to local buckling in steel MRFs. In this study, AISC 360-16 and AISC 341-16 flange and web slenderness limits for steel Ibeams were examined numerically and a method to delay the deterioration due to local buckling was proposed. After validating the modelling approach adopted in this study, beam sections with varying flange and web slenderness ratios were generated and analyzed under both monotonic and cyclic loading. Moreover, effectiveness of using a pair of vertical stiffeners in plastic hinge regions of MRF Ibeams was demonstrated through cyclic analysis results. Results showed that AISC 341-16 highly-ductile flange slenderness ratio limit is adequate to attain 80% of plastic moment capacity at 0.04 rad drift level, when the web slenderness ratio is considerably less than the AISC 341-16 highly-ductile web limit. It was also shown that the proposed stiffening method delayed degradation due to local bucking and improved rotation capacity of steel MRF I-beams. Stiffener distances measured from the beam end were given as a function of beam flange width.

Subject Keywords

Local buckling, Moment resisting frames, Steel beams, I-section beams, Vertical stiffeners

URI

https://hdl.handle.net/11511/104815

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Graduate School of Natural and Applied Sciences, Thesis