Web Crippling Behaviour of Cold-formed Stainless Steel Beams with Non- Circular Web Opening (original) (raw)
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2017
Web holes are commonly used in beams of buildings to facilitate services. In this paper, a combination of tests and nonlinear finite element analyses is used to investigate the effect of such web holes on the web crippling strength of coldformed ferritic stainless steel unlipped channels under the end-two-flange (ETF) loading condition; the case of flanges fastened to the load and reaction plates is considered. The results of 27 web crippling tests are presented, with 9 tests conducted on unlipped channels without web holes and 18 tests conducted on unlipped channels with web holes. In the case of tests with web holes, the holes are located either centred or offset to the load and reaction plates. A quasi-static finite element model is then presented. Good agreement between the tests and finite element analyses is obtained in terms of failure load, failure modes and post-buckling behaviour.
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Shear behaviour of cold-formed stainless-steel beams with web openings: Numerical studies
Structures, 2021
A R T I C L E I N F O Keywords: Finite element modelling Cold-formed stainless steel Shear strength Lipped channel beam Circular web openings New design rules A B S T R A C T : Cold-formed stainless-steel (CFSS) sections are increasingly popular for architectural and structural applications, especially in the corrosive environment due to its resistance to corrosion and other various benefits. The combination of stainless-steel material properties and the lightweight section properties makes the CFSS section the right choice for offshore steel structures. The demand for the stainless-steel sections in the construction industry is limited to a certain extent due to the higher cost; thus, the optimal use of stainless steel is vital. Openings to the web of CFSS Lipped Channel Beams (LCB) are introduced to facilitate the building services to reduce the floor height. Subsequently, the shear capacity is reduced due to the reduction of the web area. However, only very limited researches have been conducted so far to predict the reduced shear capacity of CFSS LCBs with circular web opening. Hence, this paper addresses a numerical study to investigate the shear behaviour and strength of cold-formed austenitic grade 1.4301 and duplex grade 1.4462 stainless steel LCB sections with unreinforced circular web openings. A detailed parametric study was carried out by developing 180 Finite Element Analyses (FEA) models to establish a wide-ranging shear strength database following the validation process with available shear test results. The analysis of the numerical results showed that the currently available reduction factor equations are either conservative or unsafe to use for the CFSS LCBs with circular openings. Hence, three sets of equations with different approaches to predict the shear capacity of CFSS LCBs with circular web opening are developed and presented in this paper.
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2017
An extensive parametric study of cold-formed ferritic stainless steel unlipped channels with fastened flanges subjected to web crippling under end-two-flange (ETF) loading condition is undertaken, using quasi-static finite element analysis, to investigate the effects of web holes and cross-sections sizes. Both cases of unlipped channels with and without web holes are considered. The web holes are located either centred or offset to the load and reaction plates. It is noted that no cold-formed stainless steel standard provides capacity reduction factors for unlipped channels with fastened flanges subject to end-two-flange loading condition. The strengths obtained from reduction factor equations are first compared to strengths calculated from equations recently proposed for cold-formed stainless steel lipped channels. It is demonstrated that the strength reduction factor equations previously proposed for cold-formed stainless steel lipped channels can be unconservative for cold-formed...
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Finite Element Analyses of Cold-formed Stainless Steel Beam with Web Openings in Shear
ce/papers, 2019
In the recent years, an increase in the use of stainless steel in the construction industry has been witnessed, more specifically in exposed architectural applications and where total life economics, durability, improved resistance to aggressive environment etc. are prime deciding criteria. However, limited research has been undertaken on the shear behaviour and strength of cold-formed stainless steel beam with web openings. Hence a numerical study was undertaken to investigate the shear behaviour and strength of cold-formed stainless steel with web openings. Finite element models of simply supported cold-formed stainless steel Lipped Channel Beams with web openings were developed under a mid-span load. They were then validated with currently available shear test results and further used in a detailed parametric study. In this research, both stocky and slender cross-sections were considered. The ultimate shear capacities from finite element analyses confirmed that currently available design equations are inadequate to determine the shear capacities of stainless steel beams with web openings. Hence improved design equations were developed for the shear capacity of cold-formed stainless steel beams with web openings. This paper presents the details of this numerical study of cold-formed stainless steel beams with web openings, and the results..
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Shear Capacity of Cold-Formed Stainless Steel Beam with Elliptical Web Openings: Numerical Analyses
2019
Cold-formed stainless-steel sections are increasingly being used in the construction industry, for both architectural and structural applications. The excellent combination of mechan-ical properties and corrosion resistance makes stainless steel a very good material for structural applications. Due to the lack of design rules for stainless steel, the design rules for carbon steel have been generally adopted in the stainless-steel design. However, the prominent non-linear be-haviour of stainless steel, which is the main difference with carbon steel, makes the standards for carbon steel not always accurate in the stainless-steel design. The provision of web openings at appropriate locations in such sections is also important to avoid cutting holes at an inappropriate location during the implementation stage. The type of section and the shape of opening were primarily chosen based on the application. The scope of this study is however limited to stainless steel Lipped Channel Beams (LC...
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Buildings, 2021
This paper investigates the interior-one-flange web crippling strength of cold-formed steel channels at elevated temperatures. The stress-strain curves of G250 and G450 grade cold-formed steel (CFS) channels at ambient and elevated temperatures were taken from the literature and the temperatures were varied from 20 to 700 °C. A detailed parametric analysis comprising 3474 validated finite element models was undertaken to investigate the effects of web holes and bearing length on the web crippling behavior of these channels at elevated temperatures. From the parametric study results, it was found that the web crippling strength reduction factor is sensitive to the changes of the hole size, hole location, and the bearing length, with the parameters of hole size and hole location having the largest effect on the web crippling reduction factor. However, the web crippling strength reduction factor remains stable when the temperature is changed from 20 to 700 °C. Based on the parametric a...
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