Abstract—This paper present the optimization of partial replacement of natural sand by M- sand and recycled coarse aggregate addition of manufactured sand up to 50% yielded comparable strength with that of the conventional concrete. Recycled Coarse Aggregate is obtained from the demolition of building materials. The mechanical properties for various replacements of sand by M-Sand and course aggregate by Recycled Coarse Aggregate were studied. The different concrete mixes used were 10, 20, and 30%. The cylinders were casted and tested for 28 days for all replacements and modulus of elasticity was calculated. Beam column joint in a reinforced concrete Moment Resisting Frames is the crucial zone for transfer of loads effectively between the connecting elements (i.e., beams and columns) in RC structure. But, the failure of reinforced concrete frames during many earthquakes has demonstrated heavy distress due to shear in the joints that culminated in the collapse of the structure. Hence the beam-column joints are casted for various replacements of M-Sand and Recycled Course Aggregate and tested for the seismic behaviour and compared to the model of ANSYS. Concrete Filled Steel Tubular (CFST) members utilize the advantages of both steel and concrete. They comprise of a steel hollow section of circular or rectangular shape filled with plain or reinforced concrete. Steel member shave the advantages of high tensile strength and ductility, while concrete members have the advantages of high compressive strength and stiffness. Composite members combine steel and concrete, resulting in a member that has the beneficial qualities of both materials. In this paper, an attempt was made with steel tubular beam column joint filled with different types of concrete using M-Sand and Recycled Course aggregate. The effects of steel tubes, compressive strength of concrete and the confinement of concrete are examined.
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