relation: http://eprints.science-line.com/id/eprint/1316/
title: Moment Gradient Factor Verification for Selected Monosymmetric Beams under Linear Moment Gradients
creator: Mudenda, Kenny
subject: TA Engineering (General). Civil engineering (General)
description: The reuse of doubly symmetric beams by converting them into monosymmetric section beams offers some promising outcomes and has potential for mitigating carbon footprint of structures. However, due to their complexity monosymmetric sections must be used in a configuration that allows the monosymmetry effects to act beneficially. Although the South African design standard for hot-rolled steel does not provide any guidance on the design of monosymmetric beams, the Southern African steel construction handbook provides a formula for determining the critical elastic buckling moment for monosymmetric beams. This guidance implies that the moment gradient factor used for doubly symmetric sections can be used on monosymmetric sections as well. The aim of the study was to verify the validity of this approach of extending the moment gradient factor used for doubly symmetric beams to monosymmetric beams for two specific types of monosymmetric sections. It was found that although this approach appears to be justified for monosymmetric members in single curvature bending it may produce unconservative values of the critical buckling load in double curvature bending between restraint points. The level of un-conservatism also varies for different spans of the same member. This makes it difficult to specify a single moment modification factor value for these cases. The sensitivity in terms of load reduction observed for double curvature bending case was different for the two members examined with this attributed to differences in how the shear centre moves relative to the centroid. It is recommended that the critical buckling load for monosymmetric sections be determined on a case specific basis for members in double curvature from linear moment gradients. Under single curvature bending the moment gradient factor for doubly symmetric members appears to give acceptable predictions of the critical load.
publisher: Scienceline Publication
date: 2024-09-15
type: Article
type: PeerReviewed
format: text
language: en
identifier: http://eprints.science-line.com/id/eprint/1316/1/JCEU14%283s%29164-171%2C2024.pdf
identifier:    (2024)     Moment Gradient Factor Verification for Selected Monosymmetric Beams under Linear Moment Gradients.   Journal of Civil Engineering and Urbanism.  164–171.  ISSN 2252-0430   
relation: http://dx.doi.org/10.54203/jceu.2024.16
relation: 10.54203/jceu.2024.16