FraMCoS 3 1998 Gifu, Japan

Size Effect on Flexural Resistance due to Bending Span of Concrete Beams

Many researchers have studied the size effect on the flexural resistance of concrete beams under bending moment due to the size of cross section, but the size effect due to the length of beams has not been studied enough. The…

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Year 1998
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Abstract

Many researchers have studied the size effect on the flexural resistance of concrete beams under bending moment due to the size of cross section, but the size effect due to the length of beams has not been studied enough. The influence of beam length, therefore, has generally been modeled using a series linking model, which is a probability model. In this study, the effect of beam length on flexural resistance was inves- tigated by experiments and the series linking model was evaluated. In the experiments, two series of bending tests were performed on plain concrete beams. In Series A (B), a 4.5 x 4.5 cm (8.5 x 8.5 cm) cross section was used. In each series, all specimens had the same shear span of 8 cm (20 cm), and bending spans of 5, 7, and 9 cm (5, 10, and 20 cm) were used. The experiments showed that the flexural resistance decreased as the bending span increased, and that the series linking model overestimates the flexural resistance. The series linking model, therefore, was modified, and the modified model showed good agreement with the test results.