PSAD SITUATION 15: Simply Supported Prestressed Concrete Beam

CELE Past Board Exam Problem Situation 15: A simply supported beam has a span of 12 m. To prevent excessive deflection, the beam is pre-tensioned with 12 mm diameter strands. Given: B = 350 mm, H = 750 mm, Prestress force = 2100 kN 1. The prestressed force is applied at an eccentricity (straight) of 250 mm below the neutral axis of the beam. Which of the following gives the resulting tensile stress (MPa) in the beam due to the prestressing force? 2. Given: Uniformly distributed load on the beam = 21.5 kN/m. The prestress force is applied at the centroid of the beam. Which of the following gives the tensile stress (MPa) at midspan? 3. The beam is to support a concentrated load at midspan. The prestress force is applied at the centroid of the beam. Solve for the maximum concentrated load (kN) that the beam can be subjected so that the resulting tensile stress at mid-span is zero. Thanks for watching! Comment for questions and suggestions for future lecture in this series. Subscribe and hit the bell button to be notified for future posts. #civilengineering #boardexam #engineering #structuralanalysis #structuralengineering #CivilEngineeringLicensureExamination #PRC #PSAD #reinforcedconcrete #RCD #prestressedconcrete #prestressing #CELEApril2024