Question

what does Vcr mean ? how can a beam carry shear force without shear
reinforcement

Answer #1

Vcr means the critical shear force i.e it is the amount of shear force in a section beyond which cracks generate in the section.

✓✓ Without shear reinforcement , the beam can carry shear force by Dowel action and aggregate interlocking. When the shear force acting on the bar and the inclined cracks crosses the critical section and the longitudinal reinforcement, the dowel actio i.e deflection of the bar in the direction of crack and aggregate in the beam around the bar try to resist the deflection with interlocking each other (action of aggregate interlocking), by these duel action we shear strength increases, shear reinforcement decreases. Crack width, size of aggregate is highly depends upon concrete strength.

Assume a diagonal crack in RC beam with shear
reinforcement. What are the internal force components balancing the
shear force from loading?

Design shear reinforcement for a singly reinforced beam of 250
mm wide and 450 mm effective depth. The beam is reinforced with 4
no., 20 mm dia. bars on tension side. The factored shear force at
critical section is 50 kN. Assume 8 mm diameter 2 legged vertical
stirrups. Use M30 concrete and Fe415 steel

Please select the reinforcement spacing for the entire span of a
simply supported beam on a 22 ft span. Use the detailed method to
calculate Vc. Do not use a shear envelope diagram use the regular
shear force diagram. Use b = 16 in., d = 27 in., the main bending
reinforcement consists of 4 #9 bars. The unfactored dead and live
loads are 2.6 Kip/ft and 2.5 kip/ft, respectively, f’c = 4500 psi,
and fy = 60,000 psi. Use...

Q3: Bending moment and shear force diagrams were
plotted for a cantilever beam of span 10 m when subjected to a
uniformly distributed load of magnitude ‘w’ kN/m over the entire
span, two concentrated loads ‘2w’ kN at a distance 3 m from the
free end and ‘3.5w’ kN at a distance 4.5 m from the free end
respectively. It was observed that the value for maximum bending
moment acting on the beam is equal to (-175 kNm). Suggest a...

Plot the shear force and bending moment digrams for an
8m long beam simply supported at 0m and 6m. There is a distributed
load of 10 KN/m between the two supports and there is a point load
of 20kN located at the end of the beam.

True false:
1) When subjected to bending, a beam only develops normal stress
in tension and compression
2)the shear flow is defined as an average force per unit length
for each cross-section.
3)due to bending shear flow develops only along the beam
length.
4)) shear center is defined as the point through which force can
be applied without causing torsion
Fill in the blank:
the shear stress induced by bending in a beam is
............
Solve the question problem:
A...

what is the relation between shear force and bending
moment?

Reinforcement schedules can be applied in our daily lives. As
parents or educators, how can one use reinforcement schedules to
assist a child with language development? Furthermore, what type of
reinforcement schedule would you use and why?

For a multiple-span beam, why does "patterning" the live loading
produce the greatest force effects?

a
rectangular beam having dimensions: b=300mm and d=550mm, spans 6m
face to face of simple supports. it is reinforced for flexure with
3D36mm bars that continue uninterrupted to the ends of the soan. it
is to carry a service dead load of 23.8 KN/m (including
self-weight) and a service lice load equal to 47.6 KN/m, both
uniformly distributed along the span. use fc’=27.6 Mpa and fy=414.7
Mpa. Normal weight concrete will be used and diameter of stirrup
are 10mm.
1.using...

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