Structural Checks

Cimbra verifies every design against ACI 318-19 with four categories of checks. Each is displayed in a collapsible accordion section.

Moment Analysis (ULS)

Ultimate Limit State flexural check at multiple points along the span.

Diagram: Design moment envelope vs. flexural capacity (Mn)
Table: Position, Mu, Mn, utilization ratio (Mu/Mn), and pass/fail at each point
Pass criteria: Mu ≤ φMn at all points (utilization ≤ 1.0)

The controlling section — the point with the highest utilization — is highlighted in yellow.

Ultimate Limit State shear check at multiple points along the span.

Vc is the concrete contribution, Vs is the stirrup steel contribution based on the optimized stirrup spacing.

Serviceability Limit State deflection check.

Deflection profile: Continuous curve from support to midspan
Key values: Total deflection, deflection limit (L/360 by default), ratio
For prestressed designs: Shows initial camber and net deflection after losses
Pass criteria: Total deflection ≤ span / deflection limit

For prestressed designs only — verifies concrete stresses against ACI 318 limits at three load stages:

Stage	What's Checked	ACI Reference
At release	Top and bottom fiber stress under prestress + self-weight	§24.5.3
Sustained loads	Stress under sustained (dead + superimposed) loading	§24.5.4.1
Total loads	Stress under full service loading (dead + live)	§24.5.4.1

Each location shows the computed stress, the ACI limit, and pass/fail status.

Throughout the results:

Color	Meaning
Green	Pass — utilization ≤ 1.0
Yellow	Controlling — highest utilization (still passing)
Red	Fail — utilization > 1.0