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Analysis on Hysteretic Strain of Load-Carrying Strengthened RC Beams

Based on the reported experimental result of unchanged neutral axis position during loading and unloading, the theoretic formula of hysteretic strain after unloading is obtained for different loading condition. The reinforcement ratio is the most important factor influencing the hysteretic strain, relative unloading degree secondly, and strength of concrete and steel influencing weakly. The simplified formula of hysteretic strain is presented by a series of regression, which replacing linear interpolation between neighboring reinforcement ratios in the current code. The calculated value is close to that from the current code for the regular reinforcement ratio, but comparatively higher for short reinforcement ratio caused by steel corrosion.