Sample result
Checked about X: depth h = 16 in
This is a live sample output for a 16×16 in rectangular tied column with 8-#9 longitudinal bars (f′c = 5,000 psi, Grade 60), checked per ACI 318-19 under Pu = 200 kip and M2 = 60 kip-ft. The same section is verified against StructurePoint's published spColumn reference — see the verification pages, the full report (PDF) and the methodology. Run your own column to get an editable .docx calc-note.
Both axial and moment D/C ratios ≤ 1.00.
P-M interaction diagram
Demand (Pu, Mu) tested against the φ-reduced capacity polygon. Operating point (φPn, φMn) shown on the boundary. φ is computed per anchor from εt (§21.2.2); your operating point lies in the compression-controlled region — how the φ transition works.
| Quantity | Value |
|---|---|
| Pu (factored axial demand, kip) | 200.00 |
| φPn (axial capacity at operating point, kip) | 562.55 |
| Mu (= M2, design moment, kip-ft) | 60.00 |
No transverse load between supports. Cm from end-moment ratio per ACI 318-19 §6.6.4.5.3(a). |
|
| φMn (moment capacity, kip-ft) | 168.77 |
| φ regime (§21.2.2) | Compression-controlled φ = 0.65 throughout (εt ≤ εty = 0.00207) |
| D/C axial | 0.35 |
| D/C moment | 0.35 |
| kl/r about X | 25.00 |
Nonsway frames only (ACI 318-19 §6.6.4.3). For a sway column this result does not apply. The other axis (about Y) was not checked. kl/r about Y = 25.00, which exceeds the worst-case short-column limit of 22 (actual limit depends on the other-axis moments). Run the check about Y separately. Run about Y |
|
| kl/r limit | 34.00 |
| Tie spacing limit (§25.7.2.1) | 16.00 in (governed by b) |
| Bar clear spacing (§25.2.3) | 2.54 in ≥ 1.69 in |
Assumptions and limits
- Tie arrangement and crossties (§25.7.2.3) are not checked.
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Verdict method 4 · build fce9df8 · generated 2026-10-06 19:04 UTC