(Solved): SITUATION: The prestressed concrete beam shown is used in a bridge with a simple span of 9 m. Su ...

SITUATION: The prestressed concrete beam shown is used in a bridge with a simple span of 9 m. Superimposed Dead load and Live load are $$16.5\mathrm{kN}/\mathrm{m}$$ and $$18.1\mathrm{kN}/\mathrm{m}$$, respectively. The prestressing tendons are placed at a distance "e" below the neutral axis of the beam all throughout the span and the applied prestressing force is $$1875\mathrm{kN}$$. There is a $$15\%$$ loss of prestress at service loads. Assume $$\mathrm{I}=38.105\times 10^{?}9{\mathrm{mm}}^4$$ Specific Gravity of Concrete is $$2.4$$. Area $$=400,000{\mathrm{mm}}^{?}2$$ When e $$=345\mathrm{mm}$$, what is the stress at the Top Fiber of the beam at the midspan due to initial prestressing force only. (Write Absolute Value) When e $$=345\mathrm{mm}$$, what is the stress in the Bottom Fiber (in MPa) of the beam at the endspan due to initial prestressing force only. (Write Absolute Value) When e $$=345\mathrm{mm}$$, what is the stress in the Top Fiber (in MPa) of the beam at the end-span due to service loads and prestressing force. (Write Absolute Value) When e $$=345\mathrm{mm}$$, what is the stress in the Top Fiber (in MPa) of the beam at the mid-span due to service loads and prestressing force. (Write Absolute Value)