Design of Economical Beam Section Replacing Light Weight Material Below Neutral Axis

Abstract

This Study carried out on brick-filled reinforced concrete beams. The concrete just above neutral axis is less stressed where as the concrete below the neutral axis serves as a shear transmitting media. In RC beams less stressed concrete below neutral axis can be replaced by some light weight and low cost materials like light weight concrete, bricks etc. In this study partially utilized concrete of RC beam has been replaced by bricks, It will reduce the weight of the structure and also achieve the economy. Brick filled reinforced concrete beams acts like composite beams. We use method of initial functions for the analysis of brick filled RC composite beams Reinforced brickwork is also an alternative to reduce the use of concrete. The behavior of reinforced brick beams is similar to that of reinforced concrete beams. But in this type of structures large depth of sections obstructs the head room requirements. In such a situation RC beam is one of the alternatives, however, in RC beams strength of concrete lying near the neutral axis is not fully utilized. The concrete just above neutral axis is less stressed where as the concrete below the neutral axis serves as a shear transmitting media. Looking to the limitations of reinforced brick beams and RC beams, the concept of brick filled RC beams has been developed. Partially utilized concrete of RC beam has been replaced by bricks. In this way the economy of reinforced brick beams and strength of RC beams are tried to be combine in brick filled beams. The bond between brick and concrete layers at the brick concrete interface should essentially be very good. It should be ensured that no slip will occur between the two layers.