A NEW PLASTIC FLOW RULE FOR MOMENT-SHEAR INTERACTION IN STEEL BEAMS

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KAZEMI M.T.; SHARIFI M.

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Paper Information

Journal: Sharif Journal of Civil Engineering Year:2020 | Volume:36-2 | Issue:2/2 Page(s): 73-80

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Title

A NEW PLASTIC FLOW RULE FOR MOMENT-SHEAR INTERACTION IN STEEL BEAMS

Author(s)

KAZEMI M.T. | SHARIFI M. | Issue Writer Certificate

Keywords

Moment-Shear interaction

steel I-Sections

eccentrically braced frames

incremental analysis

mixed hinges

plastic ow rule

Abstract

The interaction of exural moment and shear force in the eccentrically braced frames with intermediate link length is a major concern of the structural analysis and design. In eccentrically braced frames, if the link length is long, the exural yielding dominates the inelastic response of the link. In case the link length is short, the shear yielding is dominant. For intermediate link length the inelastic response is controlled by the combination of exural and shear yielding. Steel frames with intermediate beam length behave Like the links of eccentrically braced frames. Therefore, the interaction of exural moment and shear force shall be considered in analysis of both intermediate link length and steel frames with intermediate beam length. For design of steel I-Sections with intermediate length, a yield surface considering Moment-Shear interaction is required for calculating the ultimate capacity. Nevertheless, for capturing the complete force-deformation curve by a nonlinear step-by-step analysis, a plastic ow rule is required in addition to the yield surface. In this paper, to investigate the plastic ow rule for the highly ductile steel I-Sections, a study is carried out using nonlinear nite element analysis. The nite element analysis is veri ed using some available experimental results in the literature. Then, shear and moment deformations are calculated by using Timoshenko beam theory. Investigating the results of nite element analyses, a simple and practical non-associated plastic ow rule is proposed for the highly ductile steel I-Sections. Finally, to show the applicability of the proposed plastic ow rule, an incremental (step-by-step) analysis is performed on a beam with intermediate length in which a mixed hinge is formed. This example is solved two times using both the associated and non-associated plastic ow rule. In this example, the load-de ection path resulting from the proposed ow rule is up to 7. 5 percent less than the case without interaction. Results of this example indicate that the proposed non-associated ow rule leads to a softer force-deformation path and a larger ultimate deformation prior to the collapse. In general, the effect of ow rule on load-de ection path on structures is di erent case to case and cannot be ignored in some cases.

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APA: Copy

KAZEMI, M.T., & SHARIFI, M.. (2020). A NEW PLASTIC FLOW RULE FOR MOMENT-SHEAR INTERACTION IN STEEL BEAMS. SHARIF: CIVIL ENINEERING, 36-2(2/2 ), 73-80. SID. https://sid.ir/paper/954475/en

Vancouver: Copy

KAZEMI M.T., SHARIFI M.. A NEW PLASTIC FLOW RULE FOR MOMENT-SHEAR INTERACTION IN STEEL BEAMS. SHARIF: CIVIL ENINEERING[Internet]. 2020;36-2(2/2 ):73-80. Available from: https://sid.ir/paper/954475/en

IEEE: Copy

M.T. KAZEMI, and M. SHARIFI, “A NEW PLASTIC FLOW RULE FOR MOMENT-SHEAR INTERACTION IN STEEL BEAMS,” SHARIF: CIVIL ENINEERING, vol. 36-2, no. 2/2 , pp. 73–80, 2020, [Online]. Available: https://sid.ir/paper/954475/en

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