Experimental studies to examine the effects of opening on flexural strength and ultimate deformation using reinforced concrete column specimens with a holed sidewall failing in flexure were reported. The target of this test series was to get the limitation on location of openings to avoid their effects. In other words the locations of openings were examined so that holed sidewalls show the same flexural performance as un-holed sidewalls. Eight specimens were tested. Seven of them were specimens with one holed side wall. Main variables were the location of openings. Using these test results the proposed limitation lines on location of openings to avoid their effects for flexure was found to be effective for practical design.
