It can be shown that one can take account of the presence of the steel reinforcement by replacing the actual steel and concrete cross section with a fictitious section thought of as consisting of concrete only.Then the only difference from the homogenous beam is in the presence of the steel reinforcement. ![]() It d h ECH Figure 4.2-2: Strain and stress distribution during elastic uncracked stage. is the moment of inertia of cross section about neutral axis - € max Ep fmax fp €1 Figure 4.1-1: Stress distribution according to conventional flexural formula. M - is the bending moment at the section, 1. is the bending stress at distance y from the neutral axis. For the homogenous beams (i.e., the beams made from single homogenous material like steel or wood) and in the elastic range, the bending stresses can be computed based on the following relation: M.y f = I f. ![]() Value of concentrated force "P" that the beam could carry at it midspan.It has fc = 9.00MPa, fs = 124MPa And n = 10. ![]() A concrete beam shown below has a simple span of 7m.
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