Structural Design of Cold-formed Steel face-to-face Connected Built-up beams using Direct Strength Method

Selvaraj, Sivaganesh; Madhavan, Mahendrakumar

doi:10.1016/j.jcsr.2019.05.053

Cited by 66 publications

(14 citation statements)

References 24 publications

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“…2 Figure 2. Built-up closed sections R beams [4], plain channels [8], lipped channels [9], C sections [2,14,15], I sections [7] and sigma sections [18] were connected by screws [2, 4, 7-9, 14, 15] and spot welding [18] to form a closed section and investigations were carried out. Laim et al [4] investigated R built-up close section and 2R connected together by U profile's web and concluded that the 2R beam showed the best specific strength.…”

Section: Closed Built-up Beamsmentioning

confidence: 99%

“…Ghannam [2] investigated a C section connected face to face in which DS and EW gave a conservative result for bending moment capacity also more experimental works are needed to fill the shortage of data in this field research. Selvaraj and Madhavan [18] tested built-up closed sigma sections with intermediate stiffeners interconnected by spot welding concluded that Modified design procedures and design equations are recommended. Yao et al [7] investigated I section connected face to face and concluded that good agreement among numerical and experimental results was achieved.…”

Section: Closed Built-up Beamsmentioning

confidence: 99%

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Assessment on the Behaviour of Cold-Formed Steel Built-up Beams

Vijayanand

Gowshika

Greevan

et al. 2021

Recent Advancements in Geotechnical Engineering

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Abstract. Cold-formed steel, thin-walled steel product finds a wide application in construction worldwide. It has many advantages such as flexibility, convenient handling and fabrication and so on. The CFS is commonly used in structures like bridges, railway coaches etc., as it is economical when compared with hot-rolled steel. It can be used as single or built-up flexural members. Generally, the open section beams are susceptible to failure by lateral- torsional buckling due to the position of its centre of shear and centroid of the cross-section. To overcome this issue, open doubly-symmetric built-up sections or built-up closed sections have been used by many researchers. The parametric studies were conducted by many researchers to find the accuracy of the design strength predictions of the built-up beams. In parametric study, Eurocode specifications, the direct strength method and effective width method based on the North American specifications were used. The study reveals that there are no proper design guidelines available in the current Eurocode and North American specifications. Therefore, the paper provides an outline of research works done on various CFS sections by the researchers and their proposed design recommendations to the codal specifications were also reviewed.

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Section: Closed Built-up Beamsmentioning

confidence: 99%

Section: Closed Built-up Beamsmentioning

confidence: 99%

Assessment on the Behaviour of Cold-Formed Steel Built-up Beams

Vijayanand

Gowshika

Greevan

et al. 2021

Recent Advancements in Geotechnical Engineering

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show abstract

“…Semakin besar rasio tinggi web-tebal penampang (h/t) dan rasio lebar sayap-tebal (w/t), kapasitas balok tersusun boks akan semakin berkurang, sedangkan jarak sambungan yang semakin rapat berdampak pada peningkatan kapasitas penampang tersusun. Selvaraj & Madhavan (2019) juga menyimpulkan bahwa jarak sambungan longitudinal yang lebih kecil pada balok yang disusun dari penampang sigma dapat meningkatkan kekompakan penampang tersusun boks. Xu et al (2009) melakukan studi parametrik pada balok tersusun boks yang dibebani secara konsentris maupun eksentris.…”

Section: Pendahuluanunclassified

“…Studi literatur terkait balok penampang tersusun boks menunjukkan bahwa metode "sum up" (asumsi AISI) merupakan metode yang umumnya dipakai untuk memperkirakan kekuatan lentur balok penampang tersusun boks. Anbarasu (2019), Selvaraj & Madhavan (2019), Abbasi et al (2018), Zhang & Young (2018), Haris et al (2018), Li et al (2016), serta Wang & Young (2016) menggunakan asumsi ketebalan ganda pada elemen penampang yang disambung (overlapping) atau komposit penuh dengan mengabaikan jarak sambungan. Hasil dari penelitian-penelitian tersebut menunjukkan bahwa kekuatan lentur penampang tersusun dengan asumsi komposit penuh memiliki nilai yang tidak konservatif.…”

Section: Metode Desain Komponen Struktur Baja Canai Dingin Yang Tercantum Dalamunclassified

“…Perbandingan kapasitas lentur uji spesimen dan kapasitas desain dari penampang tersusun boks dengan asumsi kanal-lip dan komposit penuh disajikan dalam Gambar 12. Asumsi desain kapasitas lentur penampang tersusun boks berdasarkan AISI (2kl), kapasitas momen sama dengan kapasitas total penampang tunggal, menunjukkan hasil yang sangat konservatif baik pada metode EWM maupun DSM, sedangkan untuk asumsi penampang komposit penuh kedua metode memperlihatkan hasil yang tidak konservatif sama seperti pada penelitian Anbarasu (2019), Selvaraj & Madhavan (2019), Zhang & Young (2018), Haris et al (2018), Li et al (2016), serta Wang & Young (2016). Kombinasi tekuk lokal dan tekuk torsi lateral (LB + LT) teramati pada sampel B81-1,0-s328, B81-1,0-s300 dan B81-1,0-s250 (Gambar 14, 15 dan 16).…”

Section: Hasil Dan Pembahasanunclassified

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The Effects on Screw Fasteners Spacing on Flexural Behavior and Strength Capacity of Cold-Formed Steel Built-Up Box Sections

Making¹,

Awaludin

Supriyadi³

2021

MKTS

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The capacity and behaviour of cold-formed steel built-up sections are affected by the arrangement of the connections. This study aims to determine the effect of the screw spacing to the bending capacity and behaviour of the cold-formed steel built-up box section which made from lipped-channel (1.0 mm thick, 81 mm web height, 8.5 mm lip height, upper and lower wing width 38 mm and 40 mm). A total of 19 beams with a length of 1200 mm each are subjected to pure bending moments by applying two point loads spaced 600 mm in the midspan. The screw spacing variations in the moment span are 100 mm, 150 mm, 200 mm, 250 mm, 300 mm, 328 mm, and 350 mm. The test results show the average of bending capacity of the beam test is increasing with the reduction in screw spacing while the screw configuration also affects the beam capacity. Analysis of the bending capacity using the effective width method and the direct strength method based on AISI S100-16 gives very conservative results. The failure mode of the built-up box sections were observed in the form of local buckling, distortion, and lateral-torsional buckling.

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Numerical simulation of ultra‐lightweight concrete encased cold‐formed steel structures

Eid¹,

Joó²

2021

ce papers

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The use of thin‐walled structures has been increasingly spread in the last few decades due to their big advantages in both structural design and construction methods. Therefore, the recent researches have discussed a wide range of thin‐walled structures applications. However, the resistance of such structures will be decreased by buckling effect; hence, different ways of strengthening methods have been investigated. One of this method is the use of lightweight concrete as a filling of thin‐walled members. Previous experimental research at the Department of Structural Engineering at Budapest University of Technology and Economics, was carried out to investigate the axial behavior of polystyrene aggregate concrete (PAC) braced CFS elements [1]. The effect of PAC has led to increase the load‐bearing capacity and to restrain the global and distortional buckling modes of steel elements. The results revealed that the ultimate load was increased by 37‐94%. A simplified nonlinear finite element model was developed in ANSYS software to be able to predict the peak resistance of PAC filled thin‐walled members. GMNI analyses were carried out to validate the numerical model by the experimental tests. The concrete was modelled by using springs with adequate stiffness, where a parametric study was conducted to determine the proper imperfection amplitudes of different element lengths. The numerical model showed good agreement with test results.

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Structural Design of Cold-formed Steel face-to-face Connected Built-up beams using Direct Strength Method

Cited by 66 publications

References 24 publications

Assessment on the Behaviour of Cold-Formed Steel Built-up Beams

Assessment on the Behaviour of Cold-Formed Steel Built-up Beams

The Effects on Screw Fasteners Spacing on Flexural Behavior and Strength Capacity of Cold-Formed Steel Built-Up Box Sections

Numerical simulation of ultra‐lightweight concrete encased cold‐formed steel structures

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