PSAD Refresher Series

Currently Playing: PSAD Refresher 98: Stresses and Deflection of Prestressed Concrete Beams

Enrol to our Review Center: https://www.facebook.com/share/1AC24Wsb9v/?mibextid=wwXIfr SITUATION: A concrete beam with a rectangular section 300 mm wide and 500 mm deep is prestressed by 2 post-tensioned cables of area 600 mm2 each, initially stressed to 1600 MPa. The cables are located at a constant eccentricity of 100 mm throughout the length of the beam having a span of 10 m. The unit weight of concrete is 24 kN/m3 and modulus of elasticity is 38 GPa. 1. Find the maximum stress at the bottom of the beam at mid span section due to prestressing and self-weight. A. 28.16 MPa (T) C. 28.16 MPa (C) B. 24.56 MPa (C) D. 24.56 MPa (T) 2. Neglecting all losses, find the deflection at the center of the span when it is supporting its own weight. A. 24.16 mm C. 20.21 mm B. 16.26 mm D. 12.31 mm 3. Allowing for 20% loss in prestress, find the final deflection at the center of the span when it carries a superimposed load of 18 kN/m. A. 20.91 mm C. 7.52 mm B. 12.60 mm D. 16.17 mm 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 #theoryofstructures #cele #strengthofmaterials #mechanicsofmaterials #staticsofrigidbodies #steeldesign #compressionmember #trusses #friction #refresher #PSADRefresher #SHET