地震時のひずみ速度の影響による鉄筋コンクリート部材の耐力の増大と破壊モードとの関係に関する研究

概要

論文の詳細を見る
During an earthquake, strength of reinforced concrete (RC) members increases greater under dynamic loading than under static loading by the effect of strain rate. The increases of flexural strength and shear strength differ from each other. This may cause a different failure mode from the one, planned in the structural design. In this paper, the relationship between the increase of strength and the change of failure mode of RC members is investigated. Analytical investigations reported that the strain rate of RC members may be around 10^4〜10^5μ/sec during an earthquake. Under this strain rate, while the increase ratio of the flexural strength is about 1.15〜1.3, the one of the shear strength is about 1.15〜1.25. When axial force is beyond the balanced axial force, the increase ratio of flexural strength is greater than the one of shear strength. To achieve the flexure failure mode irrespective of axial force level, the design shear strength must be 15% greater than the flexural strength.
1997-02-28