Chapter 8: Industrial and Non-residential Buildings

摘要

Cold-formed steel structures are non- or low-dissipative structures. They can be designed to resist seismic actions using an elastic design with a behaviour factor q equal to 1.5-2, as EN 1998-1 (2001) proposes. However, for special cases, and using an adequate design methodology (e.g. local plastic mechanism method, displacement based analysis or performance load criteria), a more optimistic design is possible. On this purpose, Eqn. 8 may be used.But, due to the fact the seismic performance of such a type of structures is primarily based on redundancy and overstrength, the structural design criteria for structure and detailing, as they are stated in EN 1998, must be applied. Therefore, due to the lightness of cold-formed steel structures, and if the conceptual design rules for seismic resistant structures are correctTy applied, they are generally designed from the combination of permanent and variable actions, and not from the accidental ones, like the seismic action is; exception can be for bracing system, for some structural connections and for supporting details (Dubina et. al., 2000, 2001).