无粘结部分预应力高强混凝土梁延性试验研究

Experimental research on ductility of unbonded partially prestressed high strength concrete beams

通过 2 6根无粘结部分预应力高强混凝土梁 ,研究了影响其延性的主要因素 :非预应力筋配筋率、预应力筋配筋率、跨高比和荷载作用方式 .试验结果表明 ,随着受拉区非预应力筋配筋率和预应力筋配筋率的增大 ,梁的延性逐渐减小 ;随着受压区非预应力筋配筋率的增大 ,梁的延性逐渐增大 .荷载作用方式对梁的延性有一定影响 ,跨高比对延性的影响有待进一步研究 .

Based on the experimental results of 26 unbonded partially prestressed high strength concrete beams, this paper studies the effect of various factors on the ductility of the beams: non prestressed and prestressed reinforcement index, ratio of beams span to depth and the types of loading. The experimental results show that the ductility of the beams decreases gradually with the increasing of non prestressed and prestressed reinforcement index in the strained zone; the ductility of the beams increases with the increasing of non prestressed reinforcement index in the compression zone; the loading types also affect the ductility; and the influence of the ratio of span to depth on the ductility expects further study. Based on the experimental results, the related formula on the parameter of deformation ductility and integrated reinforcement index is established.