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The present paper investigates experimentally the effect of confined compression zone on the capacity of reinforced concrete beams. In addition, theoretical analysis confirming the test results is presented. In this respect, 12 medium scale RC beams were prepared, cast and statically tested in four-point bending up to failure at the reinforced concrete laboratory of the department of Structural Engineering of Al Azhar University. The following parameters were considered in the experimental program: aConfinement shape bAmount and spacing of transverse steel (ties) cCompression to tension reinforcement ratio (As`/As). The main test parameters were increasing the compression to tension steel ratios. Accordingly, compression to tension steel ratio increasing from 0.395 maximum recommended Egyptian ECCS 203-2001 Code ́s limit and even violated to 0.606 and 0.825 in the tested beams. In addition, extra stirrups were provided in the compression zone. These additional stirrups were chosen with different diameters and different spacing. The cracking and failure loads, deflection, strain, crack patterns and failure modes were recorded and analyzed. Furthermore, an analytical procedure was presented to predict the load carrying capacity for similar confined beams. The test results first showed expectedly increased flexural capacities with increased compression to tension steel ratios. But at the dramatically reduced deformations, strains, and hence ductility at rates which considerably increased when the Egyptian ECCS 203-2001 Code’s practically accurate recommended limit was violated in control beams. However, for the beams with extra stirrups provided in the compression zones, considerably enhanced deformation, strain, and hence ductility were monitored at adequately increased capacities, despite the high tension along with compression to tension steel ratios provided, due to the additional confinement of concrete in compression.

Experimental and Analytical Study of Confined Compression Zone on Capacity of Reinforced Concrete Beams