Abstract: The five rectangular reinforced concrete beams strengthened by bottom steel plates (SPCC beams) firmly interconnected to it by either headed-stud or k-shaped shear connectors are manufactured using either high strength or normal strength concrete where trial mixer conforming to the fundamental fresh and hardened concrete constraint has been successfully produced to satisfy the standard tests of concrete in its two age stages. The variables of the tested beams where the grade of concrete, the shear connectors deformability, the spacings of shear connectors (controlling the degree of partial interaction) and shape of shear connectors. They have been loaded up to failure under the effect of a two-concentrated load system where the failure modes have been observed and the load-deflection relationships, the load-relative end slip relationships and the flexural resistance have been reported. Then, the average flexural stiffness, the degree of recovery and the average anti-slip stiffness have been evaluated from interpretations of the measured response. The experimental results show that there substantial improvements in the flexural performance and the integrity preservation have been achieved from elevating the grade of concrete embedment for the shear connectors. On the contrary, increasing the spacing of the headed-stud shear connectors twice has seriously lowered the flexural fulfillment and the integrity level. Fortunately, those serious degradations have been amended by replacing the faraway spaced headed studs by k-shaped shear connectors of the same length and spacing. Hence, the degree of partial interaction has proved to own a primary effect on the SPCC beams performance. In specific, the 80% lengthening of the moderately spaced headed-stud shear connectors proves to have a significant role in elevating the flexural resistance and ductility and increasing the anti-slip stiffness. Finally, the flexural performance of the reference SPCC test beam has also been analyzed by the non-linear three dimensional finite element analysis employing Abaqus/CAE Version 6.13 program to predict its flexural performance represented by the load-deflection relationship where high levels of coincidence with the experimental evidence are achieved preserving the threshold of 90%.