コンクリート系構造部材のせん断強度について

Abstract

Proposed in this paper is a trial to provide analytical approach to systematically know the ulti-mate shear capacity of structural concrete columns (reinforced concrete columns, concrete encasedrolled or welded sections with solid webs, concrete encased steel tube section and others) under com-bined state of compression, bending and shear by applying the extended additive strength theory, which has often been discussed individually.The analysis for the reinforced concrete columns make use of the extended additive strengththeory based upon beam and arch mechanism concept. The exact plastic solutions are expressed interm of the magnitude of compression, the column length ratio, the amount of longitudinal and shearreinforcements, material strength, cross-sectional dimension and others. In the case of concreteencased steel columns, subjected to combined stresses, the extended additive strength theory is basedon the strength of reinforced concrete portion, steel portion, covered plain concrete and core plainconcrete.Theoretical solutions are compared with about 400 test results which could be found in the morerecent literature. It will be noticed that the peak of the frequency curves of the ratio of test valuesto theoretical ones lie in general somewhat above unity. In view of the scatter associated shearfailures, the proposed plastic solutions of ultimate shear capacity may be deemed satisfactory.