Capacity moment of precast hybrid beam with lightweight concrete.

Reducing the quantity of concrete could be done by using lightweight concrete to elements of structure. The question is how the flexural strength of precast hybrid beam if loaded and how the moment occurred. The aim was to observe the flexural strength and the resulting moment, as compared to a conventional beam. This study involved two categories of precast beams, namely hybrid beams (H1, H2) and conventional beams (C). The results of beam H1 and H2 and conventional beam C were flexural strength at ultimate and moment capacity at ultimate. The ultimate flexural strength of the conventional beam C was attained at 10.99 tf with an ultimate moment capacity of 3.30 tf·mm. Flexural strength of beam H1 at ultimate was achieved 10.66 tf at moment capacity ultimate 3.20 tf,mm and flexural strength of beam H2 at ultimate was achieved 10.84 tf at moment capacity ultimate 3.25 tf,mm. The compressive strength of normal concrete is 28 MPa and the compressive strength of lightweight concrete is 4.96 MPa with density 1510 kg/m³. Precast hybrid beam with lightweight concrete behaves as a normal beam and has enough ductility with δu/δy 3.4 for specimen C, 2.7 for specimen H1 and 3.1 for H2 and could be said all specimens behaves in limited ductility. [ABSTRACT FROM AUTHOR]