> ## Documentation Index
> Fetch the complete documentation index at: https://calcs.com/docs/llms.txt
> Use this file to discover all available pages before exploring further.

# Calcs.com Release Notes — December 22–31, 2025

> Major updates to Atlas Tube connections, new seismic classifications, and significant Builder workflow enhancements.

> 🎉 **Ending 2025** — This release marks the final updates of 2025!

## What's New & Improvements

### **Engineering Calculators:**

* [**Seismic Analysis**](https://calcs.com/calculators/seismicAnalysisUS) **🇺🇸:** Added SFRS Class H support for steel systems not specifically detailed for seismic resistance.
* [**Project Defaults**](https://calcs.com/docs/calculators/library/us) **🇺🇸:** Introduced CBC 2025 support, aligning project load standards with ASCE 7-22 and IBC 2024.

### [Atlas Tube Connection Hub](https://www.atlastube.com/hss-connections-hub/)

* [**Direct Factored Loads**](https://www.atlastube.com/hss-connections-hub/) **🇺🇸 🇨🇦:** Expanded direct factored load input capabilities across HSS-to-HSS Splice, Chevron Bracing, Base Plate, and Truss connections. Users can now toggle between individual load inputs and direct factored loads with updated conditional visibility and load combination logic.
* [**HSS-to-WF Moment Connections**](https://www.atlastube.com/hss-connections-hub/) **🇺🇸 🇨🇦:** Added comprehensive axial load handling with new connection axial load inputs, factored load combinations (ASD/LRFD/LSD), and axial demand widgets for both positive and negative moment scenarios.
* [**HSS Concrete Filled Moment Connections**](https://www.atlastube.com/hss-connections-hub/) **🇺🇸 🇨🇦:** Introduced beam axial load tables with combined axial-moment checks and added governing limit state percentages to the top header for quick reference.
* [**HSS Trusses**](https://www.atlastube.com/hss-connections-hub/) **🇺🇸:** Expanded two-branch support to include TKYX connection classification, load distribution tables, and comprehensive geometry and section property inputs.
* [**WF-to-HSS Shear WT Connections**](https://www.atlastube.com/hss-connections-hub/) **🇺🇸:** Added built-up tee capability with new input widgets, conditional logic, and dynamic summary diagrams that include flare bevel welds.
* [**WF-to-HSS Moment Connections**](https://www.atlastube.com/hss-connections-hub/) **🇨🇦:** Added support for the Diaphragm II connection type, including new limit states, bolt/weld calculations, and shear flow modifications.
* [**HSS-to-HSS Moment Connections**](https://www.atlastube.com/hss-connections-hub/) **🇨🇦:** Enhanced analysis to handle simultaneous positive and negative moments with separate top and bottom limit state evaluations.

### [Calcs Builder](https://calcs.com/builder)

* **Combine Mode & Review:**
  * Removed template code restrictions, allowing widgets to be copied between any sheet templates.
  * Added search functionality and pagination to the template browser for better discovery.
  * Fixed sidebar navigation issues and improved error banner scrolling behavior.
* **Preview Mode:**
  * Added utilization checks display to the new layout navbar.
  * Improved UI with preset selection highlighting and expanded search results in the sidebar.
* **Visual Improvements:**
  * Enhanced widget card shadows, highlighted reference IDs, and improved contrast for better readability.
* **AI Chat:**
  * CalcsAI now answers faster and handles complex questions more reliably.

## New Help Articles

* [**Automatic Unbalanced Loads / Live Load Patterning**](https://calcs.com/docs/running-calculations/setting-up-a-calculation/loads/automatic-unbalanced-loads-live-load-patterning) **🇺🇸**\
  Learn how to use automatic live load patterning to find the most critical loading conditions for continuous beams and multi-span structures.
* [**Typical Formula References**](https://calcs.com/docs/running-calculations/checking-results/typical-formula-ref)\
  A quick guide showing how to use formulas and references in Calcs.com and typical ones you may encounter in our calculators.
* [**Steel Base Plate (LRFD)**](https://calcs.com/docs/calculators/connections/us/steel-base-plate-lrfd) **🇺🇸**\
  Design steel base plates to ACI 318-19 using LRFD methodology.
* [**Wind Loads (ASCE 7-22) - Components and Cladding Overview**](https://calcs.com/docs/calculators/wind-loads/us/wind-loads-components-cladding-overview) **🇺🇸**\
  Overview of components and cladding wind load calculations per ASCE 7-22.
* [**Segmented vs. Perforated Shear Walls**](https://calcs.com/docs/calculators/walls-and-slabs/us/segmented-vs-perforated-shear-walls) **🇺🇸**\
  Understanding the differences between segmented and perforated shear wall design methods.

## Updated Help Articles

* [**Truss Types**](https://calcs.com/docs/engineering-concepts/truss-types)\
  Updated guide displaying the different types of trusses in Calcs.com and their applications.
* [**How to Enter Distributed Loads (Imperial Units)**](https://calcs.com/docs/running-calculations/setting-up-a-calculation/loads/how-to-enter-distributed-loads-imperial-units)\
  Updated guide for entering distributed loads using imperial units.
* [**How to Enter Distributed Loads (Metric Units)**](https://calcs.com/docs/running-calculations/setting-up-a-calculation/loads/how-to-enter-distributed-loads-metric-units)\
  Updated guide for entering distributed loads using metric units.