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206 results on '"Gunalan, Shanmuganathan"'

25. Web crippling behaviour of cold-formed high-strength steel unlipped channel beams under End-One-Flange load case

Author

Elilarasi Kanthasamy, Dinesh Lakshmanan Chandramohan, Gunalan Shanmuganathan, Keerthan Poologanathan, Perampalam Gatheeshgar, Marco Corradi, and Alex Mcintosh

Subjects
High-strength cold-formed steel, Unlipped channel section, Web crippling, End-One-Flange (EOF) load case, Finite element analysis, Direct strength method, Materials of engineering and construction. Mechanics of materials, TA401-492
Abstract

High-strength Cold-Formed Steel (CFS) members are widely adopted as structural members in building structures due to its higher ultimate capacity. The flexural members are often subjected to concentrated transverse loads which may leads to buckling instabilities including web crippling. However, there is no appropriate design rules and studies are available to estimate the web crippling strength of high-strength CFS members. Hence, this paper presents a detailed numerical investigation on high-strength CFS unlipped channel sections subjected to End-One-Flange (EOF) loading condition with nominal yield strengths of 700 MPa, 900 MPa and 1000 MPa. For numerical simulation study, non-linear Finite Element (FE) models were developed and validated with the experimental results followed by an extensive parametric study using ABAQUS. In total, 243 FE models were developed with different geometric and material parameters including section thickness, material strength, web slenderness ratio, inside bent radius to thickness ratio and bearing length to thickness ratio. The ultimate web crippling strength results were compared with the available design guidelines to check their suitability and accuracy in terms of strength prediction. Then, new design rules to predict the web crippling capacity of high-strength CFS unlipped channel section under EOF condition based on unified and Direct Strength Method (DSM) approaches were proposed.

Published
2022
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50. Structural Behaviour and Design of Aluminium Lipped Channel Beams Under Combined Actions

Author

Gunalan, Shanmuganathan, Guan, Hong, Nguyen, Anh Vy, Gunalan, Shanmuganathan, Guan, Hong, and Nguyen, Anh Vy

Abstract

Full Text, Thesis (PhD Doctorate), Doctor of Philosophy (PhD), School of Eng & Built Env, Science, Environment, Engineering and Technology, During recent decades, the use of aluminium lipped channel (ALC) beams as purlins, and floor joists in roof and floor systems in the construction industry has significantly increased due to their superior mechanical characteristics compared to steel, such as durability, light weight, high strength to weight ratio, and being weatherproof. However, despite these advantages, the elastic modulus of aluminium is only one-third that of steel. Hence ALC beams with shorter span lengths are vulnerable to buckling failures under concentrated load, such as shear and web crippling. On the other hand, ALC beams with longer span lengths can fail due to combined actions such as bending and shear actions, and bending and web crippling actions. In the past, the structural response of ALC beams has been investigated, but only under single actions of shear, web crippling, and bending. However, the behaviour of ALC beams subjected to combined bending and shear actions, and bending and web crippling actions needs to be investigated for real-world engineering applications. To address this research gap, experimental and numerical investigations on the strength and behaviour of ALC beams subjected to two scenarios of combined bending and shear actions, and combined bending and web crippling actions were conducted, and are presented in this thesis. The first step of the research focused on experimental investigation. Subsequently, numerical investigations including validation and parametric studies were carried out. Finally, the current available design rules were assessed and new design rules were proposed where needed. The experimental study comprised four test series of pure bending, web crippling, combined bending and shear actions, and combined bending and web crippling actions, using 12 different ALC sections. All ALC beams chosen for the experimental test program were supplied by BlueScope Permalite, Australia. The test specimens were fabricated by roll-forming method using aluminium

Published
2022

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