Design Data

Code

Design of Concrete Structures (CSA A23.3-19)

References

• Concrete Design Handbook, Fourth Edition, 2016, Cement Association of Canada (CAC), Example 8.1.

• spColumn Engineering Software Program Manual v10.10, STRUCTUREPOINT, 2023

• “Slenderness Effects for Columns in Sway Frame - Moment Magnification Method (CSA A23.3-19)” Design Example, STRUCTUREPOINT, 2023

Design Data

Concrete

fc’ = 40 MPa

ρc = 2,400 kg/m3

Steel

fy = 400 MPa

Slab:

hs = 150 mm,

beff = 1,800 mm

Beams:

h = 500 mm,

bw = 400 mm,

l = 7 m

Columns:

h = 500 mm,

b = 500 mm

Additional service design forces obtained from first-order analysis will be considered in this example to outline and discuss the evolution of CSA A23.3 provisions in slenderness calculations for non-sway columns where the largest first-order moment, M2, is less than the minimum moment, M2,min:

Table 1 - Additional column service loads cases

Load Case

Axial Load, kN

Bending Moment, kN-m

Top

Bottom

Dead, D

1,776

48

-8

Live, L

1,320

30

-5

04

Figure 3 - Service Design Forces