圧縮部が横拘束(コンファインド)補強された鉄筋コンクリート柱の終局曲げ強度算定式

概要

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Accurate and easy calculation of the ultimate flexural strength (M_u) of reinforced concrete (RC) columns in necessary to design the columns under flexural moment, axial force and shear force. In this paper, the following results are obtained from investigation on the ultimate flexural strength M_u. (1) Stress block coefficients k_1k_3 and k_2 at the maximum value of k_1k_3 were indicated to be useful for calculating M_u in RC columns. These two coefficients denote the ratio of the average stress of stress-strain curve up to an arbitrary strain to the compressive strength and the ratio of the strain at the location of center of gravity of the corresponding area to the arbitrary strain, respectively. (2) Equations to estimate the coefficients k_1k_3 and k_2 for calculating M_u were derived from the examination of the two coefficients, based on the stress-strain relations proposed previously for plain concrete and confined concrete. (3) Equation to calculate M_u, in which confined concrete in the compression zone and intermediate longitudinal reinforcement of the column sections are considered, were derived under the assumption of the use The evaluation of the previous experimental results of the ultimate flexural strength M_u by these equations gave about 10 percent smaller values on an average than the experimental ones, irrespective of axial load magnitude.
社団法人日本材料学会の論文
1991-09-15