What it calculates
PMM generates a three-dimensional P-M-M capacity surface for the selected RC section and material model.
- TS500, TS500-TBDY and ACI 318-19 analysis modes
- Load-level DCR, capacity point and scale factor
- Optional moment-curvature curve and shear check
Inputs
Define section geometry, reinforcement, material properties and load combinations.
- Rectangular or circular section dimensions
- Longitudinal and transverse reinforcement layout
- Concrete and steel strength/strain inputs
- Load combinations with axial force and moments in two directions
Outputs and reports
The results view presents the capacity surface, demand-capacity measures by load and section checks.
- Nominal/design P-M-M surfaces, DCR and status
- Section and load inputs with capacity points
- Compatibility table, preliminary shear check and optional M-φ results
- Analysis summary, plots and report export
Validation
PMM validation documents browser/server parity and golden regressions; it does not claim independent third-party validation.
- Old-versus-new golden regressions for four sections and a 20-scenario test report are documented.
- A TS500 golden case reports DCR 0.760314; a TBDY expected-strength case reports DCR 0.593301.
- The documentation does not report independent hand-calculation or external-tool validation of the 3D surface.
Who it is for
PMM is intended for structural engineers assessing RC columns and sections under axial force and biaxial bending.
- Engineers checking section capacity surfaces and load combinations
- Design teams reviewing DCR, shear and moment-curvature results
Frequently asked questions
How should I interpret DCR?
The guide interprets DCR ≤ 1 as within capacity and DCR > 1 as exceeding capacity.
Do PMM inputs come from a geotechnical site investigation?
No. Section, reinforcement and load-combination data come from structural design or structural analysis.
What does the moment-curvature result include?
For the selected axial load and angle, the documentation lists moment, curvature, neutral axis and concrete/steel strain points.
Does PMM run every building-level seismic check?
No. Its documented scope is section-level P-M-M interaction and the listed section checks.