抄録
In the previous papers, Part I, II, there were analysed on one-way load-deflection relationships and moment-curvature relationships of reinforced concrete members subjected to constant axial loads, and they were compared with test results in the elasto-plastic range. In Part III, moment-curvature hysteresis loops of reinforced concrete members under cyclic bending moments were calculated and their physical meanings were made clear. Here, in this paper, lateral load-deflection relationships with constant deflection amplitudes and axially accumulated strains of reinforced concrete members subjected to cyclic bending moments under constant axial loads are presented experimentally and analytically. Tests were carried out up to the fracture of reinforced concrete members namely, up to the time at which the constant axial loads became unable to be sustained, and then the test results reported cover the total fatigue characteristics of reinforced concrete members. Although calculations are concerned with an early few cycles of bending, the physical meanings of the load-deflection hysteresis loops and the mechanism of the cumulative axial strains of reinforced concrete members subjected to elasto-plastic cyclic bending moments under axial loads are made clear by comparing analytical results with test results.
