Question

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.

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...

A simply supported reinforced-concrete beam has to resist a
maximum factored moment of M* = 210 KN-m. Given that f’c = 32 MPa,
fy = 500 MPa and that the maximum possible width for the beam is
240 mm: a. Establish an appropriate structural depth ‘d’ for the
beam b. Determine the total depth ‘D’ of the beam for a FRL of 90
minutes c. Find the area of steel Ast required to resist the moment
and select the rebars....

A simply supported rectangular concrete beam is 18 in. wide and
has an effective depth of 32 in. The beam supports a factored load
(wu) of 15 kips/ft. on a clear span of 22 ft. The given load
includes the weight of the beam. Use f'c = 4,000 psi. and fy =
60,000 psi.
Over what length of span are stirrups required?
Group of answer choices
8.35 ft.
9.18 ft.
10.26 ft.
Stirrups are not required for this beam.
None...

A simply supported rectangular concrete beam is 18 in. wide and
has an effective depth of 32 in. The beam supports a factored load
(wu) of 15 kips/ft. on a clear span of 22 ft. The given load
includes the weight of the beam. Use f'c = 4,000 psi. and fy =
60,000 psi.
What is the un-rounded stirrup spacing requirement at the
critical section?
Group of answer choices
3.23 in.
3.63 in.
4.04 in.
4.50 in.
None of the...

A rectangular, tension-reinforced beam is to be designed for
dead load of 500 lb/ft plus
self-weight and service live load of 1200 lb/ft, with a 22 ft
simple span. Material strengths will be fy =
60 ksi and fc・= 3 ksi for steel and concrete, respectively. The
total beam depth must not exceed 16
in. Calculate the required beam width and tensile steel
requirement, using a reinforcement
ratio of 0.60 ρ0.005 . Use ACI load factors and strength reduction
factors....

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...

Determine the largest allowable bending moment for a rectangular
reinforced concrete beam having the width b = 200 mm, total height
h = 375 mm and the distance from the bottom surface of the beam to
the centre line of steel bars = 75 mm. Use the total area of steel
As = 1360 mm2, modulus of elasticity of concrete = 30 GPa, modulus
of elasticity of steel = 210 GPa, allowable compressive stress for
concrete = 15 MPa and...

Design a simply supported one-way reinforced concrete floor slab
to span 12 ft and carry a service live load of 180 psf and a
service dead load of 20 psf. Use fc’=3000 psi and fy=60,000 psi.
Make the slab thickness to 1⁄2 inch increments. (Hint: Design the
slab according to the ACI Code minimum thickness)

Calculate the total area of steel required in tension zone for a
simply supported beam of 230 mm wide, 406 mm effective depth. The
total ultimate factored moment on the beam is 146.76 kN.m. Assume
an effective cover for the compression reinforcement as 20 mm.
Mu,lim of the section is 130.76 kN.m. Use M25 grade concrete and
Fe415 steel. Check for spacing, shear and deflection is not
required.

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