Deflections of partially previously strained reinforced concrete constructions at repeated loadings

Abstract

Abstract The behavior of partially prestressed structures under repeated loads is considered. The effect of repeated loads on the deflections of partially prestressed structures is studied. The analysis of the deflections after the influence of the cycles of reloading on the deflections of partially prestressed structures at various levels of reloading carried out. It revealed that after the formation of cracks, the stiffness of the cross sections of the beams significantly decreases, because of which an acceleration of the increment of deflections observed. The linearity of the graphs of the dependence of the deflection on the moment violated: a characteristic break point appears, the deflection lines become convex in the direction of the load axis. In contrast to specimens without prestressing or fully prestressing, in the partially prestressed elements, three characteristic break points of deflection curves corresponding to crack formation, yield stress of tensile and non-tensile reinforcement can be distinguish.