Question

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 allowable tensile stress for steel = 150 MPa.

no code to be considered

Answer #1

so the max allowable bending moment is 516.0078 KN-m.

(30 pts) A short reinforced concrete column is
subjected to a 1000 kN axial compressive load. The moduli of
elasticity of plain concrete and steel are 25 GPa and 207 GPa,
respectively, and the cross-sectional area of steel is 2% of that
of the reinforced concrete. Considering the column as a structural
member made of a composite material and subjected to load parallel
to the steel rebars, calculate the following:
a. the modulus of elasticity
of the reinforced concrete
b....

. A rectangular beam of size 300 * 600 mm is
reinforced with steel bars of area 1530 mm^2. Concrete of Grade
C-25 and steel of Grade 420 is to be used. Depth of neutral axis
(y-dash) is found to be 312 mm.
Find the stress at the bottom of the section, if
applied bending moment is 45 KN-m.

A reinforced concrete beam is constructed with Grade 30 concrete
which has a cross section of 450 mm x 660 mm (b = 450 mm and D =
660 mm). The length of the beam is 5 m. The elastic modulus of the
concrete is 32.8 GPa. A uniformly distributed live load of 23 kN/m
is acting on the beam. Determine (a) the design bending moment on
this beam for strength limit state, (b) modular ratio assuming Es =
200...

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....

The width of a rectangular beam is 250 mm and the
effective depth is 317 mm. The tensile reinforcement is provided by
3 bars of 16 mm. Determine the moment of resistance of the section
as per limit state method.
Extracts of BS8110
grades:
Concrete 25 KN
Fcu =40 N/mm2
Fy=fyv=460 N/mm2

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 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.

Knowing that the reinforced concrete beam cross section
effective depth is d = 310 mm and the properties of materials used
are f'c = 28 MPa and fy = 420MPa and the external ultimate bending
moment Mu = 254 KN.m with strain in tension steel reinforcement
equal to 0.005 . The width of the beam is Select one : a . 511 b .
385 c . 460 mm d . 640

Determine the cracking stress of concrete in a reinforced beam
of rectangular section of breadth 250mm, gross depth 450mm, and
effective cover to reinforcement 40mm. the beam contains 4N16 bars
all arranged in one layer in tension face. Take the concrete is N32
grade.

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....

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