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Experimental studies of the shear behaviour and strength of lipped channel beams with web openings
Abstract Cold-formed steel members are increasingly used as primary structural elements in the building industries around the world due to the availability of thin and high strength steels and advanced cold-forming technologies. Cold-formed lipped channel beams (LCB) are commonly used as flexural members such as floor joists and bearers. However, their shear capacities are determined based on conservative design rules. Current practice in flooring systems is to include openings in the web element of floor joists or bearers so that building services can be located within them. Shear behaviour of LCBs with web openings is more complicated while their shear strengths are considerably reduced by the presence of web openings. However, limited research has been undertaken on the shear behaviour and strength of LCBs with web openings. Hence a detailed experimental study involving 40 shear tests was undertaken to investigate the shear behaviour and strength of LCBs with web openings. Simply supported test specimens of LCBs with aspect ratios of 1.0 and 1.5 were loaded at mid-span until failure. This paper presents the details of this experimental study and the results of their shear capacities and behavioural characteristics. Experimental results showed that the current design rules in cold-formed steel structures design codes are very conservative for the shear design of LCBs with web openings. Improved design equations have been proposed for the shear strength of LCBs with web openings based on the experimental results from this study.
Highlights Shear behaviour of lipped channel sections with web openings is investigated. Forty shear tests were conducted to determine the ultimate shear strengths. Shear buckling and post-buckling strength characteristics are studied. Current shear design rules in cold-formed steel structures design codes are very conservative. Improved shear strength design rules are proposed within the cold-formed steel code guidelines.
Experimental studies of the shear behaviour and strength of lipped channel beams with web openings
Abstract Cold-formed steel members are increasingly used as primary structural elements in the building industries around the world due to the availability of thin and high strength steels and advanced cold-forming technologies. Cold-formed lipped channel beams (LCB) are commonly used as flexural members such as floor joists and bearers. However, their shear capacities are determined based on conservative design rules. Current practice in flooring systems is to include openings in the web element of floor joists or bearers so that building services can be located within them. Shear behaviour of LCBs with web openings is more complicated while their shear strengths are considerably reduced by the presence of web openings. However, limited research has been undertaken on the shear behaviour and strength of LCBs with web openings. Hence a detailed experimental study involving 40 shear tests was undertaken to investigate the shear behaviour and strength of LCBs with web openings. Simply supported test specimens of LCBs with aspect ratios of 1.0 and 1.5 were loaded at mid-span until failure. This paper presents the details of this experimental study and the results of their shear capacities and behavioural characteristics. Experimental results showed that the current design rules in cold-formed steel structures design codes are very conservative for the shear design of LCBs with web openings. Improved design equations have been proposed for the shear strength of LCBs with web openings based on the experimental results from this study.
Highlights Shear behaviour of lipped channel sections with web openings is investigated. Forty shear tests were conducted to determine the ultimate shear strengths. Shear buckling and post-buckling strength characteristics are studied. Current shear design rules in cold-formed steel structures design codes are very conservative. Improved shear strength design rules are proposed within the cold-formed steel code guidelines.
Experimental studies of the shear behaviour and strength of lipped channel beams with web openings
Keerthan, Poologanathan (author) / Mahendran, Mahen (author)
Thin-Walled Structures ; 73 ; 131-144
2013-06-25
14 pages
Article (Journal)
Electronic Resource
English
Experimental studies of the shear behaviour and strength of lipped channel beams with web openings
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Improved shear design rules for lipped channel beams with web openings
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