Shear behaviour of RC beams externally prestressed with CFRP rods.

摘要

Shear failure in concrete beams is sudden and catastrophic. The main difficulty in predicting the concrete shear contribution is that concrete is a composite, nonhomogeneous, and nonisotropic material that cracks at a low tensile stress. Also, the shear-span-to-depth (a/d) ratio of a beam affects the shear transfer mechanism, which in turn, has a significant influence on the shear capacity. Most of the previous shear studies have focused on non-prestressed concrete members. Research on the effects of prestressing on the shear behaviour is scarce, especially for externally-prestressed concrete beams. To the author's knowledge, the shear behaviour of reinforced-concrete (RC) beams externally prestressed with carbon-fibre-reinforced polymer (CFRP) rods has never been studied before. (Abstract shortened by UMI.)