PSAD Refresher 22: Design and Analysis of Doubly Reinforced Rectangular Concrete Beam

SITUATION 22: A cantilever beam 250 mm x 400 mm deep is 3 m long. It is subjected to the following service loads: Dead Load (including beam weight) = 12 kN/m Live load at the free end = 20 kN Given: Concrete fc’ = 28 MPa Longitudinal steel, fy = 413 MPa Lateral ties, fyv = 275 MPa Clear concrete cover = 40 mm Cover to centroid of reinforcement = 70 mm Load factor for strength design: U = 1.2DL + 1.6LL Strength reduction factor: 0.90 for moment and 0.75 for shear Diameter of Lateral ties = 10 mm 64. Determine the maximum nominal shear stress (MPa) in the cantilever beam. 65. The tension reinforcements are to be placed on a layer only. Which of the following is most suitable? A. 8 – 16 mm C. 4 – 25 mm B. 5 – 20 mm D. 3 – 28 mm 66. The beam is reinforced with 2 legs of 10 mm diameter ties spaced at 200 mm on centers. Determine its nominal shear capacity (kN). 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 #foundationengineering #RCD #reinforcedconcrete #refresher #PSADRefresher #SHET