Experimental study on innovative sections for cold formed steel beams

Dar, M. Adil; Yusuf, Muhammad; Dar, A.R.; Raju, J.

doi:10.12989/scs.2015.19.6.1599

Cited by 31 publications

(7 citation statements)

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“…Composite CFS beams outperformed rolled steel sections in terms of strength-to-weight ratio. Material design strengths were greater when material and geometrical imperfections were present [34].…”

Section: Introductionmentioning

confidence: 97%

Composite Cold-Formed Steel Beams with Diagonal Rebars for Earthquake-Resistant Buildings

et al. 2023

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The construction industry is on the lookout for cost-effective structural members that are also environmentally friendly. Built-up cold-formed steel (CFS) sections with minimal thickness can be used to make beams at a lower cost. Plate buckling in CFS beams with thin webs can be avoided by using thick webs, adding stiffeners, or strengthening the web with diagonal rebars. When CFS beams are designed to carry heavy loads, their depth logically increases, resulting in an increase in building floor height. The experimental and numerical investigation of CFS composite beams reinforced with diagonal web rebars is presented in this paper. A total of twelve built-up CFS beams were used for testing, with the first six designed without web encasement and the remaining six designed with web encasement. The first six were constructed with diagonal rebars in the shear and flexure zones, while the other two with diagonal rebars in the shear zone, and the last two without diagonal rebars. The next set of six beams was constructed in the same manner, but with a concrete encasement of the web, and all the beams were then tested. Fly ash, a pozzolanic waste byproduct of thermal power plants, was used as a 40% replacement for cement in making the test specimens. CFS beam failure characteristics, load–deflection behavior, ductility, load–strain relationship, moment–curvature relationship, and lateral stiffness were all investigated. The results of the experimental tests and the nonlinear finite element analysis performed in ANSYS software were found to be in good agreement. It was discovered that CFS beams with fly ash concrete encased webs have twice the moment resisting capacity of plain CFS beams, resulting in a reduction in building floor height. The results also confirmed that the composite CFS beams have high ductility, making them a reliable choice for earthquake-resistant structures.

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Section: Introductionmentioning

confidence: 97%

Composite Cold-Formed Steel Beams with Diagonal Rebars for Earthquake-Resistant Buildings

et al. 2023

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“…The role of outstand and extended types of stiffener on the flexural capacity of CFS built-up beams is also explored (Muftah et al, 2019). The structural gains observed in these previous studies accounted for the different alterations made, like detailing of the intermediate stiffeners (Wang and Young, 2016a, 2016b), incorporation of cover plates at the top and bottom flanges (Anbarasu et al, 2021), adoption of lightweight boards packed in the buckling prone zone of the built-up section (Dar et al, 2018). Though, some recent investigations have displayed a superior flexural response in closed-section CFS built-up beams through the adoption of intermediate stiffening technique (Anbarasu, 2019; Selvaraj and Madhavan, 2019).…”

Section: Introductionmentioning

confidence: 99%

Reliable design rules for cold-formed ferritic stainless steel closed built-up beams

Karthik,

Anbarasu,

Dar

2024

Advances in Structural Engineering

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In the companion paper, test results were presented to explore the flexural performance of cold-formed ferritic stainless steel (FSS) closed built-up beams. Each specimen was fabricated by joining two lipped channels in a face-to-face configuration and securing them with spot welds at intermediate points along the beam span. Sectional aspect ratio, compression flange’s sectional slenderness and moment gradient were the key parameters varied to explore their influence on the flexural response of such members through tests. The current paper establishes a simplified finite element (FE) model of cold-formed FSS closed built-up beams and verifies it against the test results. Further, an extensive parametric study is carried out using the validated FE model to generate a large pool of data points. A wider database comprising of test results, numerical results obtained from this study and numerical results available in the companion paper were used to critically examine the adequacy of the current Australian Specifications (AS/NZ), American Standard (SEI/ASCE-8), European Code (EN 1993-1-4), Modified Eurocode approach suggested by Gardner and Theofanous, and Direct Strength Method (DSM) in North American Specification (AISI-S100: 2016), Modified DSM approach proposed by the authors in the literature and Continuous Strength Method (CSM) for cold-formed steel (CFS) flexural members. This makes the current study the first to extensively assess the accuracy of the various design guidelines available in the codes and other relevant literature, which explicitly highlighted their grave limitations. Accordingly, through suitable modifications and recommendations, new design rules are proposed to reliably and safely predict the flexural capacity of cold-formed FSS closed built-up beams.

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“…Siahaan et al (2016a) studied innovative rectangular hollow flanged channel beams to develop optimum sections which can delay the buckling failure in them. Dar et al (2015a) investigated various innovative CFS beam sectional profiles under flexure so as to find an ideal replacement for conventional hot-rolled steel sections. Wang and Young (2015) carried out an experimental and numerical investigation to study the local buckling and/or distortional buckling behaviour of the built-up open and closed sections under flexure.…”

Section: Introductionmentioning

confidence: 99%

Behaviour of partly stiffened cold-formed steel built-up beams: Experimental investigation and numerical validation

Dar

Subramanian²,

Dar

et al. 2018

Advances in Structural Engineering

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To address the various instability problems in cold-formed steel members, many researchers have mainly focused on developing innovative sectional profiles wherein geometry of the section plays a vital role in enhancing the inherent resistance of such sections against premature buckling. However, the process of forming such innovative shapes is not only complex and time-consuming but sometimes such sections fail to mobilize their complete reserve strength. Hence, a stiffening arrangement of weaker zones for mobilizing the untapped reserve strength is suggested. The contribution of this simple, effective and partly stiffening arrangements, aimed at eliminating/delaying the premature local buckling, is studied both experimentally and numerically and also compared with existing codes. Experimental study was carried out on different simply supported cold-formed steel beams with judiciously proposed stiffening arrangements under four-point loading. An equivalent hot-rolled steel beam was also tested to compare the efficiency of the cold-formed steel beams. The cold-formed steel beams investigated had different width-to-thickness ratio, different geometries and different stiffening arrangements. The test strengths, failure modes, deformed shapes, load versus mid-span displacements and geometric imperfections were measured and reported. The test strengths of the beam models are also compared with the design strength predicted by North American Standards and Eurocode for cold-formed steel structures. To validate the test results further, a numerical study was carried out on such stiffened cold-formed steel beams using finite element software ABAQUS. All these results show that the proposed strengthening system is efficient and economical and allow cold-formed steel beams to reach greater load carrying capacity.

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Experimental study on innovative sections for cold formed steel beams

Cited by 31 publications

References 0 publications

Composite Cold-Formed Steel Beams with Diagonal Rebars for Earthquake-Resistant Buildings

Composite Cold-Formed Steel Beams with Diagonal Rebars for Earthquake-Resistant Buildings

Reliable design rules for cold-formed ferritic stainless steel closed built-up beams

Behaviour of partly stiffened cold-formed steel built-up beams: Experimental investigation and numerical validation

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