1. Maximum Compression

1.1. Nominal axial compressive strength

From Tables 1 and 2:

Calculate total gross cross-sectional area:

Calculate the center of gravity (geometrical centroid):

Where d_i is the distance from the centroid of segment i to the reference point (top of the section).

Also due to symmetry about the x axis

    ACI 318-19 (22.4.2.2)

Since the section is regular (symmetrical) about the x-axis, the moment capacity associated with the maximum axial compressive strength is equal to zero.

1.2. Factored axial compressive strength

    ACI 318-19 (Table 21.2.2)

1.3. Maximum (allowable) factored axial compressive strength

    ACI 318-19 (Table 22.4.2.1)