D A B W E N F.

The deep beam shown below supports a factored load of 1500 kips. Draw a truss model neglecting the effects of stirrups and the dead load of the wall. Check the strength of the nodes and structs and design the tension tie. Use 5 ksi normal-weight concrete and fy = 60 ksi. Consider the overall beam height of 12 ft and the effective depth is approximately 11 ft 32" 6 ft A B 1500 kips C 34 in 21 ft D 28"

A simply supported rectangular beam of length L has a width of b and an effective depth of d. Compression steel bars are placed at a distance d' from the extreme concrete compressive fiber. The beam supports service dead loads of wD and wl, respectively. Use fc'= 28 MPa and fy = 420 MPa. For the reinforcements, use 4 20 mm tension steel bars and 4 10 mm compression steel bars. b= 390 mm d= 615 mm d'= 165 mm L= 5.85 m Wd= 27.79 kN/m WI= 32. 25 KN/m Questions 1. Calculate the height of the neutral axis measured from the extreme compression fiber. 2. Calculate the strength reduction factor for the given beam. B. Calculate the design moment for the given beam.

6