Open AccessStress-strain model for grade 275 reinforcing steel with cyclic loading
Author(s) -
Kevin J. Thompson,
R. Park
Publication year - 1978
Publication title -
bulletin of the new zealand society for earthquake engineering/nzsee quarterly bulletin
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.917
H-Index - 36
eISSN - 2324-1543
pISSN - 1174-9857
DOI - 10.5459/bnzsee.11.2.101-109
Subject(s) - envelope (radar) , materials science , strain (injury) , monotonic function , stress (linguistics) , structural engineering , composite material , bar (unit) , cyclic stress , function (biology) , stress–strain curve , range (aeronautics) , mathematics , deformation (meteorology) , mathematical analysis , physics , engineering , medicine , telecommunications , radar , linguistics , philosophy , evolutionary biology , meteorology , biology
The stress-strain relationship of Grade 275 steel reinforcing bar under cyclic (reversed) loading is examined using experimental results obtained previously from eleven test specimens to which a variety of axial loading cycles has been applied. A Ramberg-Osgood function is fitted to the experimental stress-strain curves to follow the cyclic stress-strain behaviour after the first load run in the plastic range. The empirical constants in the function are determined by regression analysis and are found to depend mainly on the plastic strain imposed
in the previous loading run. The monotonic stress-strain curve for the steel, with origin of strains suitably adjusted, is assumed to be the envelope curve giving the upper limit of stress. The resulting Ramberg-Osgood expression and envelope is found to give good agreement with the experimentally measured cyclic stress-strain curves.