Abstract
In structural analysis, precise estimation of modulus of elasticity, cross-sectional area and moment of interia of the section play an important role. It is a key factor while carrying out structural analysis for indeterminate structures. Most of the international codes quantify material behaviour for concrete as well as steel in elastic zone and is equally correct. Indian codal provisions express modulus of elasticity of concrete in terms of characteristic strength of concrete only similar to all other international codes. Structural analysis of a high rise building demands cross-sectional area of unreinforced concrete. However, area of reinforcement and stirrups provided are overlooked in the analysis. Contemporary design practice necessitates additional cycle of analysis along with design. First cycle of analysis shall yield the conventional design of sections and are of reinforcement. Based on calculated area of steel in first cycle, it is possible to arrive at effective area of concrete and respective moment of inertia by considering reinforcement in tension and compression zone. The analysis of sections can further be carried out in pre and post cracking conditions. At this stage, material as well geometrical properties play an important role. Present aim of study is to determine modulus of elasticity of reinforced concrete beams with percentage of compression reinforcement ranging from 0.29 to 0.43%. The outcomes are used to propose an empirical equation for evaluation of modified modulus of elasticity of reinforced concrete material which is a dependent on concrete grade along with percentage of tension and compression reinforcement.
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