Abstract
When exposed to elevated temperatures, steel structures undergo increasing permanent deformations with time even when the applied stress level is below that of yield stress, and this time-dependent deformation is referred to as creep. Thus, creep can be defined as an increase in strain in a solid material under constant stress over a period. The creep strain can be calculated by a creep model. As the creep models are highly phenomenological, without a consistent description, it is difficult to evaluate and extend the application of existing creep models to different structural steels. In addition, much of the available creep data in literature are for carbon steels. Therefore, for better understanding of creep effects in new type steels, which are widely used in structural engineering applications, relevant experimental creep data and the corresponding constitutive creep models are needed. This chapter deals with the creep strain of high strength steels, including Q460 steel, Q690 steel, and A572 steel, at elevated temperatures. Creep test data and creep model and creep buckling of high strength steel columns are also presented.
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