Characteristics of flexural cracks of large-scale pre-stressed reinforced concrete beams

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Evaluation of crack widths is one of important key points for performance design of pre-stressed reinforced concrete(PRC) beams and reinforced concrete(RC) beans. Owing to investigate characteristics and equations for estimating flexural crack spacing and strains of confining concrete, tests are carried out using large scale PRC and RC beams. Following main results are obtained. (1) Spacing of flexural cracks depends on depths of beams. (2) Equations to calculate strains of confining concrete using a new tensile reinforcement ratio taking into consideration of neutral axis depth of beam sections are induced. (3) Shrinkage of large scale specimens is below about one half of that of small sized specimens specified by JIS.