フラットプレート構造の柱-スラブ接合部に関する研究 : その 3 接合部のねじり実験

概要

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ACI method for predicting the strength of slab-column connections that transfer shear and moment is based on a linear variation in shear stress. Calculated values by this method are conservative when compared to measured strengths. That conservatism is due to an underestimation of the moment which is transferred between the slab and the column by torsion. Torsion tests of slab-column connections were carried out to directly investigate the magnitude of the moment that can be transferred by torsion. Based on the test results, cracking patterns, failure mode, relationship between torsional moment and angle of rotation, ultimate strength, etc. are described with figures and tables in this paper. Consequently, it is proved that the moment which can be transferred between the slab and the column by torsion, when converted into a torsional shear stress by full plastic formula, equals about 100kgf/(cm)^2 and is far greater than the value assumed in the ACI method. A method for predicting the strength of slab-column connections transferring shear and moment is suggested.
1981-02-28