doi:10.3850/978-981-08-9247-0_rp022-icsas11

ABSTRACT

Thin-walled beams exhibit elastic-softening moment-rotation characteristics in bending, and hence are designed by the elastic method. A more economical design approach, the pseudo-plastic design method, has been proposed to allow for the development of the moment redistribution in the system. To implement this method, one of the keys is to determine the pseudo-plastic moment resistance (PPMR) at internal supports. This paper reports a numerical study on the pre-buckling, post-buckling and post-failure behaviours of continuous beams of cold-formed Sigma sections near internal supports, based on which the PPMR was derived. A semi-empirical approach was then developed to find the pseudo-plastic moment resistance of CFS Sigma beams at internal supports. This approach can be used to conduct a pseudo-plastic design for cold-formed Sigma beams.

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