Abstract
An experimental program was arranged to investigate the relationship between shear deformation and pinching in lightweightaggregate reinforced concrete beams under cyclic loading. Lightweight-aggregate reinforced concrete beams and their connection to column were selected for the purpose of this study and their flexural and shear behaviors experimentally were investigated. Damaged part of the beams was determined after the test. Using the results, values of beam tip displacement, curvature, and shear distortion in the plastic hinge region of beam were measured and components of shear and flexural deformation of the beam were calculated. Investigations were also performed on the effect of damage extension at the beam-column connection joint as well as effect of shear deformation on pinching increase. It was concluded that, in the lightweight-aggregate reinforced concrete beams in which the damaged part was extended to the beam-column joint, pinching was higher and also shear deformation has a larger contribution of the total beam deformation.
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