Combined bending and shear behaviour of slotted perforated steel channels: Numerical studies

Abstract

Cold-formed steel studs and purlins with staggered slotted perforations in webs are used in building structures to produce a better thermal performance of the profiles and for the energy efficiency of structures. On the other hand, the slotted webs result in an unfavourable effect in terms of the structural performance of the element, prominently their shear, bending and combined bending and shear strengths. Relatively little research has been reported on this subject despite its importance. Many research studies have been undertaken to examine the behaviour of conventional cold-formed steel (CFS) channel sections subject to combined bending and shear. To date, however, no research has been carried out to investigate how CFS channels with staggered slotted perforations behave under combined bending and shear actions. An extensive study on this area is therefore essential. Finite element (FE) models of CFS channels with staggered slotted perforations were developed to investigate their combined bending and shear capacity. A parametric study was conducted in detail by developing FE models based on the validation process with available experimental data. This paper presents the FE analysis details of CFS channels with staggered slotted perforations subject to combined 2 bending and shear actions and the FE results. New design equations were also proposed to predict the combined bending and shear capacity of steel channels with staggered slotted perforations.

Development of affordable steel-framed modular buildings for emergency situations (Covid-19)

“…19 shows the staggered slotted perforated cold-formed steel channel. The structural performance of these channels, when it is used as a beam, was investigated by Degtyreva et al [25] , [26] , [27] and found that the reduction of the maximum reduction bending capacity is only 23% and 11% for distortional and local buckling failure. Moreover, Gatheeshgar et al [73] introduced these staggered slotted perforations to optimised CFS beams for modular building applications.…”

“…The objective of these optimisation studies was to maximise the structural capacity of CFS structural members for a given amount of material. Moreover, modifying CFS beams through providing staggered slotted perforations is efficient to enhance the thermal performance while the effect of staggered slotted perforations on flexural capacity is minimal [25] , [26] , [27] . These findings can be incorporated into steel-framed modular buildings to ensure more economical and efficient design solutions.…”

3D models of buildings of the future for use in construction printing

“…They are focused on meeting the physical, aesthetic and other needs of a person. These are retrofuturism and futurism [8], bio-tech [9], eco-architecture [10][11].…”

New distortional buckling design rules for slotted perforated cold-formed steel beams

“…However, the slotted perforated regions were provided with 1.5 mm × 5 mm mesh refinement, where 1.5 mm of maximum element size in the vertical direction and 5 mm maximum element size in the longitudinal direction in the perforated region. Similar mesh refinements were also used to study the shear [7] and combined bending and shear [8] behaviour of slotted perforated CFS channels. Fig.…”

“…The shear behaviour of slotted perforated CFS channels has been investigated through structural tests [6] and numerical modelling [7] and it was found that the ultimate shear capacity was reduced up to 70% due to the presence of slotted perforations in the web. Degtyreva et al [8] investigated the combined bending and shear behaviour of slotted perforated CFS channels through the numerical analysis and presented design proposals to predict the combined bending and shear capacity. Numerous experimental and numerical research studies have been performed to study the flexural behaviour of Csections, Z-sections, and hollow flange sections with solid webs [9][10][11][12][13][14][15][16].…”