METHOD OF EVALUATING BENDING STRENGTH OF REINFORCED CONCRETE BEAM AND REINFORCED CONCRETE BEAM DESIGNED USING THE EVALUATION METHOD

摘要

PROBLEM TO BE SOLVED: To provide a method of easily and accurately evaluating the bending strength of a reinforced concrete beam in a construction method for depositing the concretes with different design strengths in the lower section and the upper section of the reinforced concrete beam, respectively, and to properly design the reinforced concrete beam using the evaluation method.;SOLUTION: In this construction method for depositing the concretes with different design strengths in the PCa section and the post-depositing section of the reinforced concrete beam, respectively, the bending strength (Mu) of the reinforced concrete beam is evaluated by the expression 1: M_u = T_y2 (D/2 - d_t) + C_c (D/2 - β * X_n/2) + C_s1 (D/2 - d_c) where the tension of a bottom end reinforcement is T_y2, the depth of a girder is (D), the minimum covering of a tension reinforcement to a surface center of gravity is d_t, a concrete compressive force is C_c, the reduction coefficient of concrete strength is β, the distance between a compression edge and a neutral axis is X_n, a compressive force by a compression reinforcement is C_s1, and the minimum covering of the compression reinforcement to the surface center of gravity is d_c.;COPYRIGHT: (C)2010,JPO&INPIT