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This paper proposed a formula for calculating the residual crack width for RC column members. From experimental study for RC column members under bending and shear force, we modeled strain distribution of main reinforcement at maximum displacement and unloaded. Based on an assumption that crack width is the cumulative sum of the main reinforcement strain, the reduction of crack width in unloading is calculated from that model. The maximum residual crack width is determined by taking away that reduction from the crack width at maximum displacement. The crack width valued from this method gave close agreement with experimental result, so the calculation formula is developed by the method. The residual crack widths calculated by this formula underestimate the results in experimental studies.

CALCULATION FORMULA OF CRACK WIDTH ON RC COLUMNS UNDER BENDING AND SHEAR FORCE