X形配筋を用いた短スパンRC梁の降伏時耐力評価式

概要

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To achieve ductile behavior of deep RC beams, the effectiveness of diagonal reinforcing methods is widely recognized. But the strength of those beams tends to be underestimated if conventional methods are applied. In this study, the load carrying mechanism of such beams is discussed, and an important role of concrete strut formed between the compression zones on both beam ends is pointed out. The effective strength of the concrete strut is also discussed, and a method based on a strut-tie model for estimating the yield strength of diagonally reinforced deep RC beams is proposed. The method is examined through the comparison between the predicted strength and test results, and then, the method is simplified for practical use. The practical design formula proposed in this paper gives 10 to 30% higher values than those obtained from the conventional method assuming a steel truss composed of main reinforcing bars crossing at the center of the beam.
社団法人日本建築学会の論文
1996-11-30