Finite Element Analysis of Lateral Torsional Buckling Behaviour of Tapered Steel Section with Perforation

Naaim, Nurfarhah; De’nan, Fatimah; Choong, Kok Keong; Azar, Faiz

doi:10.1051/matecconf/20164702020

Cited by 3 publications

(3 citation statements)

References 9 publications

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“…The buckling moment of model 82 is 1013.08 kNm, and its structural efficiency is 481.26, which is 3.17% higher than the controlled model without opening at tapering ratio. The results from this study are identical with the finding from Naaim (2016) which stated the buckling moment capacity of a tapered steel section will increase with the decreasing number of web openings.…”

Section: Resultsmentioning

confidence: 99%

Lateral torsional buckling behaviour of tapered steel section with web opening – finite element analysis

De’nan

Hashim

Ting

2023

WJE

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Purpose Recently, this steel section has found increasing popularity in residential, industrial and commercial buildings with their high load-carrying capacity due to the nature of high strength to weight ratio properties. However, the rise on the price of steel section should be more emphasized; therefore, the optimization in steel section design is needed to overcome the issue of material cost. As such, tapered steel sections save on material use, while the introduction of web openings allows the placement of mechanical and electrical services, plumbing and also aesthetic design considerations. Design/methodology/approach The purpose of this study is to investigate the lateral torsional buckling behavior of a tapered steel section with an ellipse-shaped opening by analyzing its structural parameters. To achieve this, the finite element analysis (FEA) of the section is modeled using LUSAS software, which allows for a detailed analysis of the section's behavior under varying loads and conditions. It involves the variation in web opening size, opening layout, opening rotation angle and the tapering ratio. Eigenvalue buckling analysis is adopted to know the parametric effects of each 108 model. The size of opening varies from 0.2 to 0.5 d of the total depth where the opening located. There are three type of layouts applied in this study, which are the layouts A, B and C. There are three types of rotation angles for the ellipse-shaped opening, including the non-rotated vertical opening and two additional types formed by rotating the opening 45 degrees clockwise and counterclockwise around the center-point of the ellipse. A fixed-free boundary condition was applied, resulting in a simulation of a cantilever beam. The models are fixed at one end with a larger depth, and free at the other end with a smaller depth. Loading condition is an application of 10 kN/m uniform distributed load in the direction of gravity along the mid-span of the top flange. Findings It is observed that the model 82 with Layout A, tapering ratio 0.3, opening size 0.5 d and opening rotated in 45 degree anti-clockwise direction results in the highest structural efficiency among the 108 models. Therefore, the buckling moment of model 82 is 1,013.08 kNm with structural efficiency of 481.26, which shows an increase of 3.17% compared to the controlled model. Originality/value The FEA results shows a significant increase in ductility and stiffness of the tapered steel section with elipse shape opening and consequently changes in the behaviour of yield point.

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Section: Resultsmentioning

confidence: 99%

Lateral torsional buckling behaviour of tapered steel section with web opening – finite element analysis

De’nan

Hashim

Ting

2023

WJE

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“…High structural efficiency indicates that the structural element is strong and relatively light in analysis design. In the case of perforated steel section, the efficiency of the section and its percentage difference can be calculated by using equations (14) and (15) (De’nan et al , 2017; Naaim et al , 2016): …”

Section: Methodsmentioning

confidence: 99%

Development of efficiency analysis for I-beam steel section with web opening via numerical method

́nan

Hashim

Singh

2022

WJE

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Purpose Due to the enormous increase in economic development, structural steel material gives an advantage for the construction of stadiums, factories, bridges and cities building design. The purpose of this study is to investigate the behaviour of bending, buckling and torsion for I-beam steel section with and without web opening using non-linear finite element analysis. Design/methodology/approach The control model was simulated via LUSAS software with the four main parameters which included opening size, layout, shape and orientation. The analysis used a constant beam span which is 3.5 m while the edge distance from the centre of the opening to the edge of the beam is kept constant at 250 mm at each end. Findings The analysis results show that the optimum opening size obtained is 0.65 D while optimum layout of opening is Layout 1 with nine web openings. Under bending behaviour, steel section with octagon shapes of web opening shows the highest yield load, yield moment and thus highest structural efficiency as compared to other shapes of openings. Besides, square shape of web opening has the highest structural efficiency under buckling behaviour. The lower buckling load and buckling moment contribute to the higher structural efficiency. Originality/value Further, the square web opening with counter clockwise has the highest structural efficiency under torsion behaviour.

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“…He developed the 1D element and compared it to the 3D shell element model. Naaim et al [8] studied lateral torsional buckling behaviour of the web tapered section with perforation using the finite element method. Patil [9] studied lateral torsional buckling of web tapered cantilever beams using the finite element method.…”

Section: Introductionmentioning

confidence: 99%

An Analysis of elastic and inelastic lateral torsional buckling of web-tapered I beams using the finite element method

2019

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Elastic and inelastic lateral torsional buckling of simply web tapered I beam is studied using the finite element method. The length of the beams is 8000 mm for elastic lateral torsional buckling and 4000 mm for inelastic lateral torsional buckling. The depth of cross section at one end is 500 mm and at the other end it is varied. The thickness of the flange is 16 mm and the thickness of the web is 10 mm. The section of the beams is compact. The beams are loaded by end moments. The ratio of end moments at one end and the moments at the other end are varied. The beams are assumed to have geometric imperfection and the distribution of imperfection follows the shape of the first buckling mode of elastic lateral torsional buckling of the beam. The amplitude of the imperfection is taken one milimeter at the top flange in lateral direction. The load is increased until the beams collapse. The ultimate load is considered as the critical moments of the beams. The results of the analysis are compared to nominal lateral torsional buckling moments using the method presented in the AISC Design Guide 25 (Design Guide for web tapered members). It can be concluded that usually the critical moments of the collapse analysis are close to the critical moments of the design guide. But sometimes it is less than the design guide and it means design guide is sometimes is not on the safe side.

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Finite Element Analysis of Lateral Torsional Buckling Behaviour of Tapered Steel Section with Perforation

Cited by 3 publications

References 9 publications

Lateral torsional buckling behaviour of tapered steel section with web opening – finite element analysis

Lateral torsional buckling behaviour of tapered steel section with web opening – finite element analysis

Development of efficiency analysis for I-beam steel section with web opening via numerical method

An Analysis of elastic and inelastic lateral torsional buckling of web-tapered I beams using the finite element method

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