Question

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

Answer #1

A rectangular beam of size 250 * 650 mm, with
effective depth of 570 mm, is reinforced with 6- #19 steel bars in
two rows. Stirrups of dia. 10 mm are used as shear reinforcement
with concrete of Grade C-25 and steel of Grade 420 is to be
used.
Find the nominal moment capacity of the section.

A Reinforced beam of size 350 * 630 mm, with effective
depth of 560 mm, having concrete of Grade C-22 and steel of Grade
420 is to be used. Factored shear force at a distance of 1.0 m from
the face of support is 400 KN. Concrete strength in shear is
assumed as 150 KN. Find the maximum spacing of the stirrups if two
legged stirrup of #13 is used.

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

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

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.

. 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 24” wide rectangular beam is to be designed for shear. Assume
f’ c =4000psi and f yt =40ksi.
a. For a maximum factored shear load of 44k, select an effective
depth so that no shear reinforcement is required.
b. Using the beam dimensions calculated above, design the
required shear reinforcement (bar size and spacing) if the maximum
factored shear load is increased to 75k.

3. Calculate the load carrying capacity and percentage
of reinforcement for a short rectangular column of
cross section dimension 280 mm x 500 mm is reinforced with 4 bars
of 25 mm diameter, 2 bars of 20
mm diameter and 2 bars of 12 mm diameter. Use M30 grade concrete
and Fe 500 grade steel. Also
design a 4 legged ties necessary for this section.

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.

The stirrups of the cantilever beam are spaced 100 mm apart. The
beam’s dimensions are 250 mm x 415 mm and is reinforced by 2 – 20
mm ∅ tension bars. Neglecting the weight of concrete, determine the
allowable load P applied at the free end. Use fs = 140 Mpa, fv = 70
Mpa, ?? = 0.80 ???,????? ?? = 1.40 ???,??? ? = 7 8 . Allow 65 mm
distance from centroid of steel bars to extreme fibers....

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