Question

2. (a) A braced column which is 300 mm

square is restrained such that it has an

effective height of 4.5 m. Classify the

column as short or slender.

(b) The column supports:

(1) an ultimate axial load of 500 kN

and a bending moment of

200 kNm, or

(2) an ultimate axial load of 800 kN

and bending moments of 75 kNm

about the x-axis and 50 kNm

about the y-axis.

Design the longitudinal steel for both

load cases by constructing suitable

design charts assuming fcu = 40 N/mm2,

fy = 500 N/mm2 and the covers to all

reinforcement is 35 mm.

Answer #1

the braced column is a long column with longitudional reinforcement as per code.

answer is pasted from bottom to top

1. (a) Explain the difference between
columns which are short and slender
and those which are braced and
unbraced.
(b) Calculate the ultimate axial load
capacity of a short-braced column
supporting an approximately
symmetrical arrangement of beams
assuming that it is 500 mm square
and is reinforced with eight
20 mm diameter bars. Assume that
fcu = 40 N/mm2, fy = 500 N/mm2 and
the concrete cover is 25 mm. Design
the shear reinforcement for the
column.
2. (a) A...

determine the adequacy of a 12-ft long W12x40 column in a braced
frame to resist a factored axial load of 120 kips and factored
moments of 125ft-kips and 55ft-kops about the x and y axis,
redpectively. The column is assumed to be painted at both ends. Use
ASTM A992 steel.

A
500mm width square tied column with reinforcement on four faceshas
a gross steel ratio is 0.02 and the concrete cover from the column
surface to the steel centroid is 100 mm.
what is the nominal axial capacity of the column if subjected
to biaxial bending where ex=ey=250 mm? use fy'=21 Mpa and fy= 415
Mpa, reciprocal load method and interaction diagram below.

Design a square axially loaded short square tied column for
concentric ultimate axial load Pu = 2600 kN. f’c = 28 MPa and fy =
350 MPa. assume ρ = 0.02.
Draw the section details showing dimensions, cover, rebars,
stirrups (ties), ..etc.

A rectangular beam having b=300 mm and d=575 mm, spans 5.5 m
face to face of simple
supports. It is reinforced for flexure with 4φ32 bars that continue
uninterrupted to the ends of
the span. It is to carry a service dead load wD=30 kN/m (including
self-weight) and a service live
load =45 kN/m both uniformly distributed along the span. Design the
shear reinforcement using
φ10 vertical U stirrups. Use the equation (a) for Vc. Material
strengths are fc’=22 and...

A reinforced concrete column, 5.0 m high has a cross section
of 400 mm x 400 mm. it is reinforced by four steel bars each 20 mm
in diameter and carries a load of 1000 kN. Young’s modulus for
steel is 200,000 N/mm2 and for concrete is 15,000 N/mm2. Determine
the deformation in mm?
please show solution

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