Question

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.

Answer #1

Design the largest axially loaded rectangular column with the
aspect ratio of b/h = 1.5 to support an axial dead load of 350 k
and axial live load of 380 k. f’c = 4000 psi, fy= 60,000 psi.

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.

Deign a square tied column to support a service axial dead load
P_d of 200 K and a live load P_l of 300 K using concrete f_c^'=4000
psi and bars f_y=60000psi (use steel ratio of about 3% design the
ties and check the ACI code requirements)
ACI-318

Design a square tied column with DL = 500 KN, LL = 650 KN, fc’ =
20.7 MPa, fy = 276 MPa. Use ?? = 0.03, 25 ?? ∅ ???? ????, ??? 10 ??
∅ tied.
USE 1.2 DL + 1.6 LL
USD AND WSD.

(30 pts) A short reinforced concrete column is
subjected to a 1000 kN axial compressive load. The moduli of
elasticity of plain concrete and steel are 25 GPa and 207 GPa,
respectively, and the cross-sectional area of steel is 2% of that
of the reinforced concrete. Considering the column as a structural
member made of a composite material and subjected to load parallel
to the steel rebars, calculate the following:
a. the modulus of elasticity
of the reinforced concrete
b....

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