Currently, in precast concrete constructions, precast and cast-in-place concrete with different concrete strengths are used in a composite structural member. However, current design codes are not obvious for calculating the vertical shear strength of PC-CIP composite members using dual concrete strengths. In the present study, shear strength of composite beams using dual concrete compressive strengths (24MPa, 60MPa) was tested. The test variables were the section area ratio of two type concretes, flexural reinforcement ratio, and shear span-to-depth ratio.

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