Question

In a reinforced concrete beam , The value of internal stresses
at neutral axis is : Select one : a . B1 * 0.85 * f'c b . E * e c .
ZERO d . 0.85 f'c

Answer #1

**Summary**

**OPTION - C**

**STRESS AT NEUTRAL AXIS IS ZERO.**

**ABOVE NEUTRAL AXIS THE BEAM IS IN COMPRESSION AND BELOW
NEUTRAL AXIS IS IN TENSION FOR VERTICALLY APPLIED GRAVITY
LOADS**

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

Given fy = 60000 psi f'c = 5000 psi in a singly reinforced
concrete beam.
a) what is pbalanced?
b) what is pmin for flexure?

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...

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.

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....

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 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 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...

Derive the expression for ultimate moment of
resistance for a singly reinforced beam by using the stress block
parameter for compressive force C and tensile force T and locate
the depth of neutral axis from the top of beam.
Extracts of BS8110

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