Question

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.

Answer #1

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Determine the nominal compressive strength Pn of a
short column which subjected to biaxial bending ex- 250 mm , ey-
150 mm h - 650 mm , b - 450 mm , reinforcement 8 28.ties 10 mm ,
cover - 40mm fc - 28 Mpa , fy 420 MPa

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.

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...

A square-shaped spread footing with plan dimensions of 3m x 3m
is supporting a 500mm square concrete interior column. The column
carries a total factored load of 2850 kN. Use 25M bars Clear
cover=75mm fc’ = 25 MPa fy = 400 MPa
a) Determine the factored bearing pressure, qf, acting on the
soil due to the factored load, Pf=2850kN
b) Design the footing thickness based on two-way (punching)
shear requirements (Assume single shear will be satisfied). Assume
that the factored...

A short, square tied column has a minimum area of reinforcing
steel of 3.24 in2 and a gross area of 18 in2.
The compressive strength of the concrete is 4000 lbf/in2
and the yield strength of the steel is 60,000 lbf/in2.
What is most nearly the design axial compressive load capacity?
A) 130 kips
B) 140 kips
C) 570 kips
D) 400 kips

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...

A 16 in square column is reinforced with four No. 14 bars, one
in each corner, with cover distances of 3 in to the steel center in
each direction. Material strengths are ?? ′ = 5,000 psi and ?? =
60,000 psi. Bending will be about an axis parallel to one face.
Construct the nominal strength interaction curve based on ONLY
three points, including those corresponding to pure axial force,
pure bending moment, and balanced failure.

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