Rubrics and grading Rubrics of exams Questions Type 1 They got 2 QUESTIONS of 10 points
Grading out of 10 EACH
If you design a prestresed concrete beam that is okay at Decrease live load or Decrease Pc, increase compression stress of concrete TRANSFER, but fails in SERVICE, what should you change (f'c) any of those 10 points. If only says increase inertia, increase heigth of about the design? the beam 8 points, anything less precise but making some sense 5 points If you design a prestresed concrete beam that is okay in Increase Inertia, increase heigth of the beam, decrease e, Decrease Pi, SERVICE, but fails at TRANSFER, what should you change increase compression stress of concrete (f'ci) any of those 10 points, anything about the design? less precise but making some sense 5 points Prestressed concrete questions
AT TRANSFER in a prestressed concrete design, what loads are on the beam?
Only self load 10 points, if they say only dead 5 points, if they put live load 0 points
Transfer: Only self load, Pi is applied, F'ci. Service: Self load+Dead+%live load, What are the three primary differences between Pc is less than Pi,we consider F'c which is greater than F'ci. Three differences TRANSFER and SERVICE in prestressed concrete design? 10 points, Two differences 7 points, 1 difference 5 points AT SERVICE in a prestressed concrete beam how does the prestressing FORCE compare to the FORCE at transfer?
Pc< Pi, Prestressed force at service Pc is less than the one in transfer Pi - 10 points If they say another difference true regarding transfer vs service, example: service considers live load and transfer no give 5 points, another thing somewhat half sensible up to 2 points
