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Engineering Calculators

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🚀 New Features

  • 🚧 NEW CALCULATOR COMING SOON WF Beam to WF Girder Single-Plate Shear Connection (AISC 360-22) 🇺🇸: Introduced a new calculator covering conventional and extended single-plate configurations, with bolt, plate, beam, and girder web checks and an optional nonuniform torsion check per AISC Design Guide 9.
  • 🚧 NEW CALCULATOR COMING SOON WF to WF Single-Plate Shear Connection (AISC 360-22) 🇺🇸: Introduced a new calculator for WF beam to WF column single-plate connections, including Chapter J10 column checks for web local yielding, flange local bending, and web local crippling.
  • 🚧 NEW CALCULATOR COMING SOON Eccentrically Loaded Bolt Group ICR (CSA S16-19) 🇨🇦: Introduced a new calculator that computes the bolt-group coefficient C via the instantaneous center of rotation method, shipped with 12 validation presets covering pure shear, inclined, biaxial, and negative eccentricity cases.
  • Concrete Beam (ACI 318-19) 🇺🇸: Torsion design is now fully released. Fixed torsion diagram values that displayed 1000× too small in imperial units and clarified roughly 20 widget labels for shear and torsion demand, capacity, reinforcement ratio, cover, and self-weight.
  • Concrete Slab (ACI 318-19) 🇺🇸: Added development length, tension lap splice classification, and shrinkage and temperature reinforcement design checks.

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🛠️ Improvements & Fixes

  • Wind Loads (ASCE 7-22) 🇺🇸: Corrected linked load case labels to Load Case A and Load Case B so they match the ASCE standard.

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Atlas Tube Connection Hub

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🚀 New Features

  • 🚧 NEW CALCULATOR COMING SOON HSS to HSS Torsion Connection (AISC 360-22) 🇺🇸: New beta calculator for End Plate connections with shear and torsion load inputs, AISC 360-22 §H3.1 beam torsional strength checks, §H3.2 torsion screening, combined torsion and shear checks via the eccentric weld group method (Manual Tables 8-4 and 8-6), and an H3-6 shear–torsion interaction check.
  • 🚧 NEW CALCULATOR COMING SOON HSS Beam to HSS Girder Shear Connection (AISC 360-22) 🇺🇸: New calculator covering five connection types (Coped Beam, Through Bolt & Coped Beam, Single Plate, Exterior Plates, Through Bolt & Exterior Plates) with full plate, beam, and girder limit states and a girder torsion check per §H3.1. A new Hidden connection type with an internal hanger plate and shear cut plate has also been added, with torsion demand targeted to the girder lever arm.
  • HSS to HSS Splice Connection (AISC 360-22) 🇺🇸: Round HSS bolted splice with welded gussets is out of beta, with shear limit states across the HSS column, bolt group, splice plates, gusset plates and weld, combined shear-and-tension interaction checks, ICR bolt groups with load-angle interpolation, and a shear-plus-moment same-sides branch. Also added AISC 341-22 seismic design checks for End-Plate connections and full moment limit states for Square and Rectangular End-Plate connections per Packer & Kennedy 2025.
  • Longitudinal Plate to HSS Connection (AISC 360-22) 🇺🇸: Extended T-, Y-, and Cross-connection support to square and rectangular HSS chords, and added chord in-plane bending with axial-and-bending interaction. The new interaction also applies to round-chord Y-connections and may change the governing check.
  • Transverse Plate to HSS Connection (AISC 360-22) 🇺🇸: Added per-plate chord plastification and shear yielding checks for Cross connections, a plan-view diagram, and a corrected weld directional strength factor (k_ds 1.5 → 1.0). End distance reduction is no longer applied to the weld limit state.
  • Column Bracing (AISC 360-22) 🇺🇸: External Double Gusset is out of beta, with moment–shear–normal interaction at the beam-to-gusset interface added for all connection types and new eccentric weld group and maximum weld size checks. Also added full combined moment-and-torsion interaction checks for the single plate using the Dowswell plastic-strength method, aligning the US template with the Canadian implementation.
  • Chevron Bracing (AISC 360-22 & CSA S16:19) 🇺🇸 🇨🇦: Added an Independent Brace Loads mode so unequal brace forces can be designed, with per-load-combination demand pairing for beam-to-gusset, gusset, and transverse shear checks, plus tensile yielding capacity and resultant weld demand for the normal force case.
  • HSS Truss Connection (AISC 360-22) 🇺🇸: 1-branch and 2-branch oblique surplus cases now classify as combined Y and X per AISC DG24 §9.3 instead of returning Not Supported.

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🛠️ Improvements & Fixes

  • HSS to HSS Splice Connection (AISC 360-22 & CSA S16:19) 🇺🇸 🇨🇦: Bolt recommendation now respects Shuriken corner clearance, and a CSA crossed-dimension fix corrects long-side vs short-side clearance. For Square and Rectangular columns in tension, the end-plate weld is now required to develop the HSS wall yield strength.
  • HSS to HSS Moment Connection (AISC 360-22) 🇺🇸: Redesigned the stiffener weld from the moment-blind E&S model to a tee shear-flow model and corrected the stiffener-to-flange-plate weld to use the stiffener weld size. Existing stiffened seat designs should be re-checked.
  • HSS to WF Moment Connection (AISC 360-22) 🇺🇸: Applied the same stiffener weld shear-flow redesign as the HSS to HSS Moment fix. Existing stiffened seat designs should be re-checked.
  • HSS to HSS Shear Connection (AISC 360-22 & CSA S16:19) 🇺🇸 🇨🇦: End Plate gage distance now requires the AISC Manual Table 7-15 tightening clearance instead of the bolt diameter alone. Also corrected the Shuriken bolt symbol on H-type connection diagrams and updated HSS wall thickness in diagrams to nominal, not design, thickness.
  • HSS Truss Connection (AISC 360-22) 🇺🇸: Corrected chord shear yielding (punching shear) to evaluate for gapped Round K-Connections and combined TKYX classifications, and fixed a mismatched capacity reference in the first-branch KT-Connection punching shear check. Also fixed a red-bar error on Unbalanced YX 2-branch cases with small rectangular chords. Existing gapped Round K-Connection and KT-Connection designs should be re-checked.
  • WF to HSS Shear Connection (CSA S16:19) 🇨🇦: Fixed Simple Beam on Cap Plate to use cap-plate web bearing limits per Cl 21.3(a) and 14.3.2(a) instead of seated end-reaction formulas, corrected the cap-bolt tensile utilization check that always passed, and fixed swapped resistance factors on stiffened seated stiffener limit states. Existing Simple Beam on Cap Plate sheets should be re-checked.
  • WF to HSS Moment Connection (AISC 360-22 & CSA S16:19) 🇺🇸 🇨🇦: Fixed the slip-critical option for Diaphragm Plate II so web shear plate bolts are evaluated for slip resistance and read the correct bolt grade and thread condition. Existing slip-critical Diaphragm Plate II designs should be re-checked.
  • Column Bracing and Chevron Bracing (AISC 360-22) 🇺🇸: Corrected splice plate tensile rupture to apply AISC 360-22 Table D3.1 Case 4 shear lag based on weld length vs brace width, replacing the previous U = 1.0 assumption. Designs with short welds relative to brace width may see reduced splice plate capacity.
  • Chevron and Column Bracing (CSA S16:19) 🇨🇦: Brace Grade now displays for G40.21 HSS, and display units were corrected for gusset plastic section moduli and force and moment columns.
  • HSS Beam to HSS Girder Shear Connection (AISC 360-22) 🇺🇸: Refreshed the connection type selector icons and corrected the LRFD load combinations heading to cite ASCE 7-16 only. The heading fix also applies to the HSS Shear and HSS Moment calculators.
  • HSS Truss Bolted Connection 🇺🇸: Added the Atlas Tube sponsor badge.

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Calcs Builder

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🛠️ Improvements & Fixes

  • Widget group extraction fixes: Remote and diagram widgets now survive when you extract a widget group, and clearer validation messages appear when an extraction fails.

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Platform Improvements

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🚀 New Features

  • Ask Calcs conversation management: You can now delete a CalcsAI conversation from the history panel or from the top bar. Deleting the open chat opens a fresh empty one, and the history panel now refreshes reliably after new chats and title changes.
  • Ask Calcs landing redesign: The full-page Ask Calcs view has a cleaner landing with a centred greeting, the message box above the starter cards, an AI disclaimer, and a slimmer history rail. Once you start chatting, the top bar shows the conversation title.
  • See where a project sheet belongs at a glance: Sheets inside a calculation group now show the group name as a breadcrumb between the project and the sheet.
  • Atlas Tube availability shown for every section: The rolling availability dots and legend now appear on every row in the Atlas Tube section picker, not just after you pick one. The Connections Hub also uses first-party wording and shows an Inquire contact link.
  • In-app help panel expanded: The help panel now includes popular articles, a knowledge base promo, and a contact form with a category picker so you can reach the right team faster.
  • Atlas Tube onboarding defaults: New Atlas Tube Connections Hub signups now default to Imperial units, and the onboarding flow asks which unit system you prefer.
  • New Excel Import badge for Atlas Tube users: Atlas Tube and Connections Hub users see a “New” badge on both Excel Import entry points so the feature is easier to find.

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🛠️ Improvements & Fixes

  • Search inside a standard 🇦🇺: While reading a standard in the Standards Library, you can now search within that document. Results stay scoped as you navigate clauses and reset cleanly when you switch standards.
  • Clearer Standards Library search results: Search results are now grouped by document with up to three matching clauses per document, and each result shows the real edition status (Current, Available Superseded, and so on) instead of a hardcoded label.
  • Faster Atlas Tube signup: Self-signup users now go straight to onboarding after activating their account, with one less step in the way.
  • Change Material no longer crashes 🇦🇺: Fixed a crash when swapping material on Australian templates.
  • Fullscreen 3D diagrams sized correctly: Toggling fullscreen on a 3D diagram no longer produces an incorrectly sized canvas, and Escape and rapid clicks are handled cleanly.
  • Wind contour map tiles restored: Fixed contour overlay tiles that were failing to load on the wind maps.
  • Atlas Tube badge z-index fix: The Atlas Tube sponsor badge no longer renders above the upgrade modal.
  • Standards search empty state fix: The “request a standard” link now correctly asks to add a new standard instead of prompting users to upgrade their account.
  • Excel Import wording clarified: The Atlas Tube Connections Hub Excel Import dialog now explains more clearly what the tool does and how the Loads sheet works.
  • Retired analysis-only plans removed: The old monthly and yearly analysis-only plans can no longer be purchased by accident from the billing page.
  • App layout gutters aligned: The page card now has consistent 10px gutters on all sides, with corrected sidebar alignment and scroll behaviour on Home, Settings, and Analytics.