Flexural and shear capacity of composite steel truss and concrete beams with inferior precast concrete base

The paper presents a set of twenty-four lab tests on twelve composite steel truss and concrete beams with inferior precast concrete base completed by second phase concrete cast. The experiments investigate the shear and flexural strengths of the beams. The influence of some parameters, such as beam depth, beam width and inclination of web bars, on the beam capacities is analyzed. The obtained results are compared with theoretical evaluations of typical resisting mechanisms of steel-concrete composite and reinforced concrete structures using updated European and American design Standards. The main features of the composite steel truss and concrete beams are quantitatively and qualitatively discussed.