Abstract
This paper deals with methods and results of the experiments on reinforced concrete columns subjected to bi-axial bending moments. 14 test specimens under different combinations of bi-axial bending moments and different loading paths were tested. Remarkable points of this new loading and measuring method are as follows; 1) Bi-axial bending moments are loaded independently each other. 2) Bi-axial flexural deformations and elongation of the specimen are measured by 4 dial gages. 3) The loading and measuring apparatus folows large deforming process up to about 20 times deformation at yield moment. As the results of the experiments, following relationships are shown; 1) M_1 (bending moment on 1-axis) and φ_1 (flexural deformation on 1-axis) 2) M_2 (bending moment on 2-axis) and φ_2 (flexural deformation on 2-axis) 3) φ_1 and φ_2 4) ⊿L (elongation of specimen) and φ (total flexural deformation; √<φ_1^2+φ_2^2>) 5) M (total bending moment; √<M_1^2+M_2^2>) and W (total absorbed energy; ∫M_1dφ_1+∫M_2dφ_2) 6) M_1, M_2, φ_1 and φ_2 at yield moment 7) φ_1 and φ_2 at maximum moment
