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 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

Example text

However, engineers working in design practice still feel puzzled when dealing with stability problems of reticulated shells. The theoretical method as discussed above seems to them too complicated for direct application. So it's desirable to propose some kind of design formulas, reflecting the recent advances of theoretical study but simple in form for the convenience of practical application. For this purpose a comprehensive parametric analysis of stability behaviors of different types of single-layer reticulated shells with varying geometric and structural parameters has been carried out based upon complete load-deflection analysis with consideration of the effects of initial geometric imperfections and unsymmetrical distribution of loads.

This method assumes the geometric imperfection of a reticulated shell to be distributed in consistence with the buckling mode of first order of the structure, which is supposed to be very likely the most unfavorable for the expected limit load of the reticulated shell. More than 2800 examples of reticulated shells of prototype were analyzed, and the plentiful results obtained were thoroughly studied. As a result, practical formulas for predicting limit loads, obtained by regression analysis respectively for different types of reticulated shells, rather simple for application but based upon accurate theoretical procedure as described, were proposed.

When a compartment fire occurs beneath the floor, the behaviour of the floor system is dominated by restraint to thermal expansion, with middle surface heating and through thickness gradients causing quite different effects. The restraint to thermal expansion can easily lead to buckling and large post-buckling displacements, which are both stable and beneficial. Runaway failures are not seen in these redundant structures because the large displacements permit compressive and tensile membrane action to carry the loads in place of bending.

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