Flexural and Shear Behavior of Reinforced Concrete Beams Damaged by Alkali-Silica Reaction under Reversed Cyclic Loads
Susumu INOUE, Yasuhiro MIKATA, Kazuo KOBAYASHI and Tamotsu NIEDA
Abstract:Flexural and shear behavior of reinforced concrete beams damaged by alkali-silica reaction (ASR) was investigated under monotonous and reversed cyclic loads, mainly focused on the shear resistant mechanism after flexural yielding. In case under the monotonous loads, shear capacity of the beams damaged by ASR was rather increased by the introduced chemical prestress in spite of the strength reduction of concrete due to the existence of expansive cracks. In case under the reversed cyclic loads, the introduced chemical prestress also restrained the reduction of concrete shear capacity successfully within the deformation of 5ƒÂy . After that deformation level, however, the effect of chemical prestress almost disappeared and the ultimate deformation tended to become somewhat smaller compared with that of the beams without ASR damage. Key Words:Alkali-silica reaction, Reinforced concrete beams, Shear capacity, Expansive cracks, Chemical prestress, Reversed cyclic loads