INFLUENCE OF SECONDARY MOMENT ON THE MECHANICAL PROPERTIES OF PPC CONTINUOUS BEAMS

Starting from the mechanism producing the secondary moment,it was analyzed the influences of the secondary moment on the ultimate load and the internal force redistribution of PPC continuous beams;and it was obtained the conclusions that the influence of the secondary moment may not be considered at lower reinforcement ratio,but can not be neglected at higer reinforcement ratio because of the poorer rotational capacity of plastic hinge.Secondary moment can improve the rotational capacity of plastic hinge in PPC continuous beams of straight rainforcement;and the moment redistribution can be improved.