Parameter input guide
Use the circled i controls for units, source meaning and input guidance. Enter factored actions for the selected section. Reinforcement area is derived from bar count/diameter or spacing, not entered directly.
The N–M source is chart-assisted: independently read and confirm its chart value before the steel comparison becomes available. The axial branch is limited to source short-column conditions.
Scope and limitations
No slender-column resistance, complete N–M interaction solver, shear, links, crack width or deflection check. The source moment branch has mixed-unit eccentricity and inconsistent moment routing.
Engineering disclaimer
These tools assist engineering calculations and do not replace professional engineering judgement or independent verification. Confirm inputs, units, assumptions, applicable standards and every governing project check with a suitably qualified engineer before safety-critical use. Software and reference workbooks may contain errors or omissions. A disclaimer does not guarantee immunity from legal liability. Read the Terms / Engineering Disclaimer.