Question

While working with a concrete subcontractor, you were asked to redesign a concrete beam to use No #8 reinforcing bars as the Sub has excess amounts of it. To do so, you need to determine the following: 1) The effective depth of the beam (d) 2) The total depth of the beam (h) 3) The area of tensile reinforcing required and then the number of #8 bars The service load bending moments on the beam are 62 kip-ft for dead load and 35 kip-ft for live load. Beam width is 9 inches. ƒy is 40 ksi, and ƒ is 4 ksi. Choose the correct answer and show your work. d= 11.2 inches, h= 13.6 inches, # of bars= 8 d= 11.2 inches, h= 13.6 inches, # of bars= 10 d= 10.2 inches, h= 12.6 inches, # of bars= 8 d= 11.2 inches, h= 10.6 inches, # of bars= 8

Answer 1