Advances in Steel Structures (ICASS '02). Proceedings of the by S.L. Chan, J.G. Teng and K.F. Chung (Eds.)

By S.L. Chan, J.G. Teng and K.F. Chung (Eds.)

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Additional info for Advances in Steel Structures (ICASS '02). Proceedings of the Third International Conference on Advances in Steel Structures 9–11 December 2002, Hong Kong, China

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INTRODUCTION In many applications, a shell structure offers the most efficient usage of structural material, and produces very lightweight structures of considerable strength. In addition, shells are often seen as aesthetically pleasing, and they may be more widely used in architectural applications if difficulties of construction or fabrication can be overcome. However, shell structures display many complex responses: they are susceptible to sudden buckling failures, and are much affected by minor changes in geometry caused either by accident or as a result of loading conditions in service.

6). This analysis may be used to explore bifurcation into non-symmetric modes, but the values so obtained are not very useful. The reason is that these values do not include imperfections, so they are only reference values for the perfect structure. ^ is based on the linear eigenvalue critical load, so the GNA analysis, which includes non-linear prebuckling stress redistributions, actually does not give the required result. Thus, on this occasion, the more "accurate" analysis is of less value. In geometrically hardening structures, the appropriate load cannot be found from this analysis.

It would be very useful if new criteria could be developed that would permit a better identification of conditions under which snap-though may become critical. Secondly, most of the literature on imperfection sensitivity relates to bifurcation buckling. The literature on imperfection sensitivity in snap-though buckling is much less extensive, and it is not yet clear whether the imperfection-sensitivity factors a developed from fundamental load cases for bifurcation buckling should be applied in these cases too.

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