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Extra resources for Advances in steel structures: proceedings of the Second International Conference on Advances in Steel Structures 1, 15-17 December 1999, Hong Kong, China

Sample text

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. These fundamentally different effects of local buckling on the behaviour of pin-ended and fixed-ended channel sections lead to inconsistencies in traditional design approaches. The research program investigated these phenomena and compared the results with the design approach in AS/NZS 4600.

In Table 6, the errors 6 between tested and calculated frequencies are given as well. From Table 6 it can be seen that the frequencies of a damaged structure can be calculated by using the proposed simplified hysteresis model with sufficient accuracy. 509) . 60%) Cumulative Damage Model for the Analysis of Steel 21 The dynamic displacements Aland A3 of the model during the 10th loading are shown in Figure 6. The calculated results considering and not considering the cumulative damage effects are illustrated by Figure 7 and Figure 8, respectively.

Laterally unbraced flexural members may undergo lateral buckling with significant interaction with local and distortional modes. Clearly, more research is required in this area as the project described has found certain unconservative behaviour when compared with existing design standards for slender sections. Bearing failure may also be important in flexural members because the cold-formed sections have rounded comers and unstiffened webs. 3. Ductility was not found to be a problem in any of the members or connections tested even with high strength (G550) cold-reduced steel.

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