Skip to main content

Timber Brackets & Anchors

Verify proprietary angle brackets, hold-downs, and shear plates to AS 1720.1. Access a unified library of global suppliers like Rothoblaas, Pitzl, Eurotec, and Sihga, fully calibrated for Australian compliance.

Bridging the Gap (ETA to AS 1720)

The Australian mass timber market relies heavily on high-performance connectors imported from Europe. However, translating European Technical Assessment (ETA) characteristic values into AS 1720.1 design capacities is often a manual, confusing process for local engineers.

The SPEC Toolbox Brackets Module solves this “translation gap.” It acts as a compliance engine, automatically converting standard European data (Rk) into Australian Limit States Design capacities (Φ Nj). Whether you are specifying a Rothoblaas WHT hold-down or a Pitzl connector, this tool ensures your specification is safe, compliant, and optimized for local conditions.

What This Calculator Does

This tool unifies the supply chain, allowing you to select and verify products from leading global manufacturers in a single interface. It includes:

Automated Compliance: Automatically applies the correct Australian capacity factors (Φ) and modification factors (k1, etc.) to supplier test data.
Dynamic Visualization: A built-in 2D visual engine displays your set geometry with real-time force directions, helping you identify load paths for uplift, shear, and lateral forces.
Mass Timber & Light Frame: Covers solutions for heavy CLT hold-downs as well as standard timber framing angle brackets.
Smart Filtering: Find the right product by load type (e.g., “High Capacity Uplift”) or connection type (Timber-to-Concrete vs. Timber-to-Timber).
Nailing Verification: Verifies the required quantity and pattern of Anker nails or screws, ensuring the installation matches the design assumptions.

Timber Brackets

Technical Guide: Using Proprietary Brackets in Australia

1. The “Code Conversion” Engine

Most proprietary brackets perform according to an ETA. AS 1720.1 requires specific adjustments to these values.

Our module automatically handles the conversion:

Characteristic Strength ($R_k$): Pulled directly from the ETA.

Capacity Factor (Φ): Applied per AS 1720.1 (typically Φ = 0.70 or 0.80 depending on the failure mode and product type).

Duration of Load (k1): Adjusts for Wind vs. Dead Load cases.

2. Angle Brackets & Hold-Downs

We support the full range of connection geometries:

  • Hold-Downs (Uplift): Critical for shear walls in CLT and light-frame bracing (e.g., Rothoblaas WHT, Titan).
  • Shear Brackets: For transferring lateral loads at floor-to-wall junctions (e.g., Titan Plate, WKR).
  • Concealed Connectors: For architectural mass timber nodes (e.g., Pitzl GePi, Alu-Start).

3. Integrated Education

Designers can visualize the “true behavior” of the connection. The module includes dynamic tooltips and educational content to help you distinguish between a bracket designed for shear and one designed for uplift, preventing costly site errors.

Integrated Suppliers & Products

The platform features verified digital twins from the world’s leading connection specialists:

Rothoblaas

  • Hold-Downs: WHT (ETA-23/0813), Titan (ETA-11/0496).
  • Brackets: Nino, WKR, WKR Double (ETA-22/0089).
  • Straps: WHT Plate, Titan Plate.

Pitzl

  • Connectors: GePi Angle Brackets (ETA-21/0750) and specialized dovetail systems.

Eurotec & Sihga

  • Extensive libraries of base plates, angle brackets, and innovative timber connectors.

Key Formulas & Parameters

Design Capacity (Nd):

Nd = Φ • k1 •t kmod,ETA • Rk

  • Φ Factor: The tool applies the relevant factor (e.g., 0.7 for mechanical joints) ensuring the design meets the target reliability index of the NCC.
  • k1 Factor: Essential for wind design. A bracket that works for wind (k1=1.14) might fail under dead load (k1=0.57). The tool checks all load cases.

Fastener Group Checks:

For brackets using multiple nails/screws (e.g., 20x Anker Nails), the tool calculates the group capacity, ensuring the timber substrate doesn’t split before the bracket yields.

Frequently Asked Questions

Is this compliant with the NCC?

Yes. By applying the correct AS 1720.1 safety factors to verified ETA test data, the output can be used as part of a Performance Solution or DtS design (depending on the certifier’s interpretation of proprietary products).

Does it check the Concrete Anchor?

The tool verifies the force transferred to the anchor. We provide the specific tension and shear reactions ($N^*, V^*$) required for you to run your concrete anchor check (e.g., to AS 5216).

Can I mix and match suppliers?

Yes. You can compare a Rothoblaas solution against a generic alternative to find the most cost-effective or available option for your project.