A beam is made of high strength concrete reinforced with structural steel rod (rerod) as shown below:
The maximum bending moment is 45 kip-ft. It is applied such that the top of the beam is in compression and the bottom is in tension.
1) Determine the transformation ratio and
the concrete equivalent for the area of the steel rods
2) Remembering that the concrete below
the N.A. is in tension, determine the position of the N.A.
3) Determine the moment of inertia of
the transformed section about the N.A.
4) Determine the stresses in the steel
and the concrete