Abstract
In this study, the methods of evaluation of deflection and minimum tension bar ratio of reinforced concrete member under bending moment, which are very important in limit state design, are examined analytically. That is, at first the evaluation method of crack spacing on the basis of the relationship of moment-curvature, mechanism of occurrence of crack and bond characteristic between reinforcing bar and concrete is proposed analytically. Then the evaluation method of load-deflection of RC beams under bending moment, in which the influence of tension zone of concrete is taken into consideration, is also proposed. Besides, the evaluation method of minimum reinforcing bar ratio which is able to apply for the different material strengths is proposed in order to prevent brittle failure of reinforced concrete beams.
