SUSTAINED AND CYCLIC LOADING OF CONCRETE BEAMS.

A general analytical procedure for predicting the behavior of reinforced concrete beams subjected to variable repeated loading which includes the effect of the strain-hardening of the steel and creep behavior of the concrete is verified with a test program consisting of eight simply supported beams and six two-span continuous beams. the instantaneous moment-curvature relationship is developed using the stress-strain relations obtained from standard axial tests for the steel and concrete represent the stresses in each of the materials at any point in the cross section.