Question

4 in. 1-in. diameter 20 in. 2.5 in. Figure 7 for Problem 8 12 in. 7. (1O points) The three reinforcing steel bars are bonded perfectly to a T-shape concrete beam as shown in Figure 6. It is known that Young's moduli of steel and concrete are E,-200 GPa and Ec- 20 GPa, respectively. Determine the location of the neutral axis (NA) from the top of the beam. (You need only to set up the equation in unknown y indicated in Figure 6. No numerical work is needed to solve the equation, although do use the dimensions as indicated in the drawing. For example, the area of the upper flange is A1- 90x20; no need to use your calculator.)

Answer 1