This paper reports on the results of basic tests intended for the development of a method of shear reinforcement of reinforced concrete structures from one side using post-reinforcing bars, while preventing shear sliding failure along joints between new and old…
This paper reports on the results of basic tests intended for the development of a method of shear reinforcement of reinforced concrete structures from one side using post-reinforcing bars, while preventing shear sliding failure along joints between new and old concretes. Loading tests were conducted by using three types of beam specimens. The following were the main findings about shear reinforcement effects: (1) Post-reinforcement using straight bars with no hook or bars having hooks at one side is an effective method of shear reinforcement. It is necessary to allow for loss of their load-bearing capacity when compared with standard stirrups because of insufficient anchorage at the ends of the bars. (2) The load-bearing capacity of post-shear-reinforcement tends to be affected by the bending stress state at construction joints. The shear strength of post-reinforcement was stronger when the stress state at construction joints was tensile than when it was compressive. (3) The use of a SHCC (strain-hardening cement composites) for an added layer with post- reinforcing bars is an effective method for strengthening when compared with the use of normal concrete, as SHCCs not only increase the durability of members but also increase their toughness by 2 to 3 times.