Abstract
Literature of Steel Beams with a thin-walled trapezoidal Corrugated Web (SBCWs) shows that the capacity of SBCWs is affected by both the fatigue cracks initiated along the inclined folds (IFs) and the maximal additional stress located in the middle of the IFs. An experimental investigation on the behaviour of hybrid SBCWs under flexure is presented in this paper. This study focuses on the effect of the welding IF between the web and flanges (IFs welded or non-welded), the horizontal-fold length (200, 260, and 350 mm), and transversal flange stiffeners on the failure mechanism of the SBCW under three line load. Accordingly, six hybrid specimens were fabricated, instrumented, and tested (five SBCW specimens and one specimen with a flat web). The test setup was designed to generate shear and a moment in the testing zone via three-point bending. The results indicated that non-welded IFs specimens with or without flange stiffeners failed owing to web tearing after web and flange local buckling. The failure mode of the specimen with continuous welding between the web and flanges was local flange buckling. Finally, the paper presents a comparison between the experimental results and the European Code to predict the capacity of the flange towards local buckling. It was concluded that the non-welding the IFs affected the inelastic behaviour and the capacity of the SBCWs. In addition, the bending resistance equations presented by EN 1993-1-5 can safely predict the test results of the non-welded inclined fold and yield a high safe variation.
Highlights
Using high-strength steels in building construction is essential, as it reduces the carbon dioxide emissions in the steel industry and the total steel consumption compared with the use of conventional steel
This paper presents the results of laboratory tests of a series of trapezoidal corrugatedweb steel beams for investigating the effects of the horizontal folds (HFs) length, welding the inclined folds (IFs) between the web and flanges, and transversal flange stiffeners on their behaviour under threepoint loading
The following remarks are presented. (i) The observed failure modes indicated that specimens without welded IFs failed in compression because of web and flange local buckling followed by web tearing
Summary
Using high-strength steels in building construction is essential, as it reduces the carbon dioxide emissions in the steel industry and the total steel consumption compared with the use of conventional steel. It is well known that the failure mechanism of steel beams with trapezoidal corrugated webs (SBCW) develops in two stages: web buckling (controlled by the shear stress) and flange buckling (controlled by the yield stress). The standards and theories presume that the shear buckling stress ranges from 55% to 60% of the material yield strength. The hybrid SBCW is a special type of beam with different web and flange yield stresses. A hybrid section with a web yield stress higher than the flange yield stress is appropriate for achieving web and flange buckling at approximately the same time. A study conducted by Kengo Anami et al [2] revealed that the fatigue cracks were initiated along the inclined folds (IFs) and spread perpendicular to the principal stress direction, affecting the beam capacity. A few previous studies focused on hybrid SBCWs or non-welded IFs; general background information regarding the behaviour of SBCWs (shear and bending)—including the hybrid section and welding—is presented below
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