RC造柱の軸力負担能力に及ぼす試験体の寸法の影響

摘要

In this study, the authors consider the influences of specimen size on the deflection angle at losing point of axial load carrying capacity of RC column specimens failing in shear. The final objective of this study is to propose a realistic evaluation equation for the deflection angle at losing point of axial load carrying capacity of actual RC columns. The dimensions of the section used in this study were 180mm × 180mm, 270mm×270mm and 370mm×370mm (the height of RC column is twice the length of the depth of section). Uni - axial loading tests, residual - axial loading tests and shear -bending loading tests were conducted using the specimens with these dimensions. Applicability of the evaluating equation for deflection angle at losing point of axial load carrying capacity proposed in previous study was examined using test results considering size effects.%（1）長方形断面の柱の最大軸力以降の挙動のモデル化の際は、評価式に用いる帯筋のパラメータは長辺（弱軸）方向の値を使用する。（2）曲げせん断実験の結果、軸力の高低に関わらず軸力負担能力喪失点に寸法効果の影響があると考えられる。（3）曲げせん断実験の軸力負担能力喪失時の部材角の評価式は概ね妥当と言えるが、一部寸法効果の影響が見られた。