4. Wall Structural Analysis

Using 11.8 provisions, calculate factored loads as follows for each of the considered load combinations:

4.1. Roof Load per foot width of wall

Figure 2 – Typical Geometry of 10DT24 Section

4.2. Calculation of Maximum Wall Forces

The calculation of maximum factored wall forces in accordance with 11.8 is summarized in Figure 3 including moment magnification due to second order (P-Δ) effects.

Figure 3 – Wall Structural Analysis According to the Alternative Design of Slender Walls Method (PCA Notes)

For load combination #1 (U = 1.4 D)

Where M_ua is the maximum factored moment at midheight of wall due to lateral and eccentric vertical loads, not including PΔ effects.

ACI 318-19 (11.8.3.1)

Calculate the effective area of longitudinal reinforcement in a slender wall for obtaining an approximate cracked moment of inertia.

The following calculation are performed with the effective area of steel in lieu of the actual area of steel.

Figure 4 – 1 ft Wall Strip Cross-Section

The steps above are repeated for all the considered load combinations, Table 1 shows the factored loads at mid-height of wall for all of these load combinations.

4.3. Tension-Controlled Verification

ACI 318-19 (11.8.1.1(b))

For this check use the largest P_u (5.04 kips) from load combination 2 to envelop all the considered combinations.