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

By SL Chan and JG Teng (Eds.)

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Additional info 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

Example text

Several examples are presented of the behaviour of quite simple structures which illustrate the roles of thermal expansion, loss of material strength, the relative stiffness of adjacent parts of the structure, the development of large deflections, post-buckling and temperature gradients. Although simple, the relevance of these examples to complete structures is clear. Several counter-intuitive phenomena are noted. From these discoveries, some significant implications are drawn for the philosophy of design to be used for large buildings under fire.

Ined againstaxial translation sagging neutral axis high ~-~ ~ b ~ ] hogging neutral axis low axially ~i }1 ~ i [ restrained: compression due to changing NA location Figure 10: Compressive membrane action Figure 11: Tensile membrane action at large deflections The worst scenario for a fire in a composite frame building structure is compartment breach. Structural fire design should define compartment breach as an "ultimate limit state" and ensure that it is prevented. The only structural member in a composite frame that acts as a compartment boundary is the composite floor slab.

Many conclusions concerning behaviour could be drawn directly from the tests (Martin, 1995; Newman, 1997), but those presented here are more difficult to extract from the experimental record. The paper is particularly concerned with the development of large displacements, since these permit the new load-carrying mechanism of tensile membrane action to come into play. EFFECTS OF IN-PLANE RESTRAINT IN C O M P A R T M E N T FIRES When a compartment fire occurs in a large building, the effects are felt on the floor system above the fire and the columns of the fire floor.

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