CRACKING AND FRACTURE OF HSS BRACES UNDER CYCLIC LOADING

Abstract eng:
Concentric-braced steel frames often fracture at the mid-length of the braces during strong ground motions when the members and connections are properly designed and detailed. The paper describes a finite element model incorporating a damage accumulation model that is able to predict fracture of HSS braces under cyclic loading. Crack initiation is predicted through a refined fracture model. It is shown that the fracture life predicted from finite element analysis based on damage model agrees well with the experimental results and the refined fracture model results. Brace fracture performance is examined for an 8-storey inverted-V concentrically braced frame designed in accordance with the Canadian seismic provisions. Time history analysis of four selected ground motions is carried out on the CBF structure using the OpenSees program. Failure of the braces at the 7th storey is investigated with consideration of the deformation history demand.

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