Download Advances in Steel Structures (ICASS '99). Proceedings of The by SL Chan and JG Teng (Eds.) PDF

By SL Chan and JG Teng (Eds.)

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Extra resources for Advances in Steel Structures (ICASS '99). Proceedings of The Second International Conference on Advances in Steel Structures 15–17 December 1999, Hong Kong, China

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0 / NC /. 0 ~000 . 9 0 I 20 40 60 80 1O0 120 140 160 180 200 Le/r Fig. J. Hancock Lipped and Unlipped Channels in Compression A test program on unlipped (plain) and lipped channels in compression was performed where the channels were compressed between fixed ends and pinned ends (Young and Rasmussen, 1998a, 1998b). Whereas it is well-known that local buckling of pin-ended channel columns induces overall bending, this phenomenon does not occur in fixed-ended channel columns that remain straight after local buckling and only bend when overall buckling occurs.

The existing Class 1 section web slenderness limits, which are based on I-section members, are unconservative for RHS members. Revised design rules have been proposed. Care also needs to be taken when designing moment resisting connections in cold-formed tubular members to ensure they have adequate rotation capacity for plastic design. ACKNOWLEDGEMENTS This paper has been prepared based on the research of many people. Permission to use their test data and resulting graphs is appreciated. They were all supplied in electronic form from the original authors which explains the slight change in format between the different figures.

In a composite building, an expanding heated steel joist beneath a slab is restrained by the colder slab (a vertical thermal gradient) throughout the fire period and can become severely plastified in compression (Fig. 9) if large deflections do not occur. The slab is a major cause of thrust developing in the steel joist. The thermal expansion strains are absorbed as large compressive plastic strains, causing significant shortening of the joist. On cooling, this length reduction is not easily recovered, especially because the cooling steel gains stiffness and strength faster than the tensile stresses develop.

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