Basic
$49/mo
billed monthly
- Structural Steel HSS Design (AISC 360)
- Stainless Steel W-Shape Design (AISC 370)
- Structural Steel W-Shape Design (AISC 360)
- Unlimited saved projects, synced to your account
- Cancel anytime
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Analysis that
shows its work.
Structural engineeringin the cloud
Twelve tools for sections, steel, concrete, and footings — every result cited to the code reference that produced it.
StandardsACI 318-19 / -14 · ACI 440.11-22AISC 360-16 · AISC 370 · AISC Design Guide 9ASCE 7-10 / -16 / -22
EngineServer-side, the same code that runs every tool. The figures below are its real output, replayed.
Trial14-day free trial, no card required.
Fig. 1 — From section to cited result18 × 24 in column · f′c 4 ksi · fy 60 ksi · Pu −200 kip
01 · Section308 fibers · 8 bars
The section is meshed into fibers. Strain is linear through the depth; each fiber takes its stress from the material curve.
02 · EngineM–φ, fiber integration
φ 6.0e-4M 559 k·ft
Curvature is stepped from first crack to failure. Each step re-solves the neutral axis for equilibrium with Pu.
03 · Calc packageevery line cited
Section 18 × 24 in, 8 bars, f′c 4 ksi, fy 60 ksiInput
Pu = −200 kip held at each stepEquilibrium, ΣF = 0
c = 6.6 in from strain compatibilityACI 318-19 §22.2.1
εc = −0.0018 · εt = 0.0044Linear strain, §22.2.1.2
M = 513 k·ft at φ = 2.7 × 10⁻⁴ /inFiber integration
The output is a calc your checker can follow: each value sits beside the clause or method that produced it.
Fig. 2 — P-M-M interaction, ACI 318-19Major-axis slice · DCR read at the demand’s axial load, on the φ-factored surface
A DCR for every load case, and the line that defines it.
Each demand is checked at its own axial load. The capacity is read off the φ-factored surface in the same moment direction, and the ratio of the two is the DCR. Select a load case to hold it.
Cycling through load cases.φ-factorednominaldemand, at its axial load
Fig. 3 — W18X50, AISC 360-16 (try it)Pu 110 kip · Mux 165 k·ft · Vu 42 kip · ASTM A992 · Cb = 1
Governing flexure equationInelastic LTB, Lp < Lb ≤ LrAISC 360-16 §F2.2(b), Eq. F2-2
CompressionCh. E0.35
Flexure, majorSect. F20.61
ShearSect. G2.10.22
CombinedEq. H1-1a0.90
Pass · DCR 0.90φMn = 272 k·ft
Combined is Eq. H1-1a with Mr = B1·Mu, B1 = 1.014 for P-δ (Eq. A-8-3). Each slider position is its own run of the W-shape engine, with Lc held at 14 ft.Twelve tools, one subscription
01Stainless Steel W-Shape DesignAISC 370 · Basic02Structural Steel W-Shape DesignAISC 360 · DG9 · Basic03Structural Steel HSS DesignAISC 360 · Basic04Eccentric Weld Group AnalysisAISC 360 · Ultimate05P-M-M Interaction (ACI 318)ACI 318 · Pro06P-M-M Interaction (ACI 440 GFRP)ACI 440.11 · Ultimate07Isolated Spread Footing DesignACI 318 · Pro08Reinforced Concrete Beam DesignACI 318 · Pro09Reinforced Concrete Column DesignACI 318 · Pro10Strut-and-Tie DesignACI 318 Ch. 23 · Ultimate11Moment-Curvature AnalysisFiber method · Ultimate12Section PropertiesElastic · plastic · FE · Ultimate
One subscription, sized to your practice
Three tiers, from member design to the full analysis suite.
Pro
$89/mo
billed monthly
- Everything in Basic, plus:
- Reinforced Concrete Beam Design (ACI 318)
- Reinforced Concrete Column Design (ACI 318)
- Isolated Spread Footing Design (ACI 318)
- P-M-M Interaction (ACI 318)
- Cancel anytime
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Ultimate
$149/mo
billed monthly
- Everything in Pro, plus:
- Moment-Curvature Analysis
- P-M-M Interaction (ACI 440 GFRP)
- Section Properties
- Eccentric Weld Group Analysis (AISC 360)
- Strut-and-Tie Design (ACI 318)
- API access
- Cancel anytime
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Subscriptions renew automatically at your plan's price — Basic $49, Pro $89 or Ultimate $149 per month — plus any applicable tax, until you cancel. Cancel anytime from the Billing page; you keep access until the end of the period you've paid for, and you won't be charged again. Payments are non-refundable except as the Terms of Service provide. See the Terms of Service.
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| Feature | Basic$49/mo | Pro$89/mo | Ultimate$149/mo |
|---|---|---|---|
| Tools | |||
| Stainless Steel W-Shape Design (AISC 370) | ✓ | ✓ | ✓ |
| Structural Steel W-Shape Design (AISC 360) | ✓ | ✓ | ✓ |
| Structural Steel HSS Design (AISC 360) | ✓ | ✓ | ✓ |
| P-M-M Interaction (ACI 318) | — | ✓ | ✓ |
| Isolated Spread Footing Design (ACI 318) | — | ✓ | ✓ |
| Reinforced Concrete Beam Design (ACI 318) | — | ✓ | ✓ |
| Reinforced Concrete Column Design (ACI 318) | — | ✓ | ✓ |
| Moment-Curvature Analysis | — | — | ✓ |
| P-M-M Interaction (ACI 440 GFRP) | — | — | ✓ |
| Eccentric Weld Group Analysis (AISC 360) | — | — | ✓ |
| Section Properties | — | — | ✓ |
| Strut-and-Tie Design (ACI 318) | — | — | ✓ |
| Advanced | |||
| API access | — | — | ✓ |
CompanySTRENC LLC · Chicago, Illinois
STRENC — Structural Engineering in the Cloud. Operated by STRENC LLC, based in Chicago, Illinois, United States.
Your dataWe collect what we need to run your account, your calculations, and your billing, and nothing else. We don’t sell your data, we don’t use it for advertising, and we don’t train models on your engineering work.
A note on responsibilitySTRENC is an analysis aid. Results must be reviewed and approved by a licensed engineer before use in design.
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