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

A simply supported reinforced concrete beam has a width (b) of
14 inches, and an effective depth (d) of 24 inches. It is
reinforced with 3 # 8 bars. Assume 60-ksi steel and 3000-psi
concrete. Determine the resisting moment (Mr) in ft-k that this
beam can safely sustain.
Problem 2
The beam given in Problem 1 has a span of 21 ft. It is supposed
to carry a uniformly distributed service dead load of 3.7 k/ft, in
addition to its...

Problem 3
A reinforced concrete beam is cantilevered over a span of 10 ft.
The beam width is 14”. The beam is supposed to carry a uniformly
distributed service dead load of 1.2 k/ft and a uniformly
distributed service live load of 0.5 k/ft over its entire span. The
dead load includes an allowance for the beam weight. Assume 60- ksi
steel and 4,000-psi concrete.
1.Use the design equations to determine the minimum required
effective depth (d).
2.Select the tensile...

Problem 1
A simply supported reinforced concrete beam has a width (b) of
14 inches, and an effective depth (d) of 24 inches. It is
reinforced with 3 # 8 bars. Assume 60-ksi steel and 3000-psi
concrete. Determine the resisting moment (Mr) in ft-k that this
beam can safely sustain.

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