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The columns of high-rise structures are usually con structed from high strength concrete and the connecting beams and slabs at floo rs are of normal strength concrete. Consequently, the beam column joint is of normal st rength concrete. The purpose of the study is to investigate the strength of high st rength concrete columns as affected by the low strength concrete of connecting beams, and to study the effect of reinforcement details of the joint of high strength concrete colu mn and normal strength beam on failure mode of such column and its strength.

STATIC BEHAVIOR OF RC COLUMN JOINTS AS AFFECTED BY CHANGING OF ITS GRADE OF CONCRETE AND DETAILS OF REINFORCEMENT