STRESS-STRAIN MODEL FOR GRADE 275 REINFORCING STEEL WITH CYCLIC LOADING
暂无分享,去创建一个
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 RambergOsgood expression and envelope is found to give good agreement with the experimentally measured cyclic stress-strain curves.
[1] Robert Park,et al. REINFORCED CONCRETE MEMBERS WITH CYCLIC LOADING , 1972 .
[2] N. Draper,et al. Applied Regression Analysis , 1966 .
[3] P D Leslie. DUCTILITY OF REINFORCED CONCRETE BRIDGE PIERS , 1974 .
[4] R. Park,et al. Cyclic load behaviour of reinforcing steel , 1973 .
[5] Sozen,et al. STRESS-STRAIN RELATIONSHIPS OF REINFORCING BARS SUBJECTED TO LARGE STRAIN REVERSALS , 1973 .