Short Wall Bracing

Benefits of Short Wall Bracing

  • Tailored to fulfill the bracing requirements of open-plan housing, accommodating fewer internal walls and larger openings.
  • Offers superior bracing capacity compared to conventional sheet bracing units.
  • Requires fewer screws, reducing on-site labour.
  • Available in standardised kits for easy installation.

Design parameters

Short wall bracing using a pair of Stronghold tie-down brackets can provide various options depending on the bracing requirements, ranging from non-cyclonic to cyclonic regions.

Testing

Each Multinail Advance product undergoes rigorous testing to ensure its suitability and compliance with Australian engineering codes and standards.

Specifically, the hold-down capacity of the Stronghold tie-down brackets has undergone extensive in-house testing using glulam samples sourced from Australian suppliers.

The results from these tests exceeded the theoretical benchmarks established in accordance with AS1720.1.

Ultimate Bracing Capacity (kN)

Short wall bracing using a Stronghold tie-down bracket can provide various options depending on the bracing requirements, ranging from non-cyclonic to cyclonic regions.
The ultimate design capacity tables provided below are based on the parameters (more information, refer to AS1720.1) below:

  • STD200 to be used in a 70mm wall frame; STD320 to be used in a 90mm wall frame
  • Timber joint group JD4 and better
  • Application of structural member Category 1 (AS1720.1 Table 2.2)
  • When used in Category 2, apply a reduction factor of 0.94 for STD200 kits; no reduction factor is required for STD320 kits
  • Concrete anchor (M20) shall have a minimum tie-down capacity of 36kN for STD200
  • Concrete anchor (M24) shall have a minimum tie-down capacity of 54kN for STD320
  • Precalculated values are for bracing only, non-load bearing internal walls.
  • The design properties of GL grades specified in this brochure is based on standard characteristic values in Table 7.1 AS1720.1. While for GL15, it has a minimum design properties of:
    • Bending (fb) = 38 MPa
    • Shear (fs) = 4.2 MPa
    • Compression parallel to grain (fc) = 33 MPa
    • Modulus of Elasticity (E) = 15500 MPa
  • Horizontal deflection control value is 12mm on top of the Glulam member

If design requirements fall outside of the parameters above, please get in
touch with Multinail Advance for advice.

Table 3: Option 1 Ultimate Bracing Capacity (kN)

GLT  member size Wall height (mm) Kit
2440 2590 2740 3000
230x65 3.2 3.0 2.8 2.4 STD200-100
260x65 3.6 3.4 3.2 2.9
295x65 4.1 3.9 3.6 3.3
330x65 4.6 4.3 4.1 3.7
360x65 5.0 4.7 4.5 4.1
395x65 5.5 5.2 4.9 4.5
425x65 5.9 5.6 5.3 4.8
460x65 6.4 6.1 5.7 5.2
495x65 6.9 6.5 6.0 5.6
195x85 3.5 2.9 2.5 1.9 STD320-100
230x85 5.0 4.7 4.1 3.1
260x85 5.7 5.4 5.1 4.5
295x85 6.5 6.1 5.8 5.3
330x85 7.3 6.8 6.5 5.9
360x85 7.9 7.5 7.0 6.4
395x85 8.7 8.2 7.7 7.1
425x85 9.4 8.8 8.3 7.6
460x85 10.1 9.5 9.0 8.2
495x85 10.9 10.3 9.7 8.9
525x85 11.6 10.9 10.3 9.4
Legend for minimum grade GL18 GL17 GL15 GL13

Table 4: Option 2 Ultimate Bracing Capacity (kN)

GLT  member size Wall height (mm) Kit
2440 2590 2740 3000
230x65 4.2 3.7 3.1 2.4 STD200-100
260x65 4.6 4.3 4.1 3.4
295x65 5.1 4.8 4.5 4.1
330x65 5.6 5.3 5.0 4.5
360x65 6.0 5.7 5.3 4.9
395x65 6.5 6.1 5.8 5.3
425x65 7.0 6.6 6.2 5.7
460x65 7.4 7.0 6.6 6.0
495x65 7.9 7.4 7.0 6.4
195x85 3.5 2.9 2.5 1.9 STD320-100
230x85 5.8 4.8 4.1 3.1
260x85 7.3 6.8 5.9 4.5
295x85 8.0 7.6 7.1 6.5
330x85 8.8 8.3 7.8 7.2
360x85 9.5 8.9 8.4 7.7
395x85 10.2 9.6 9.1 8.3
425x85 10.9 10.3 9.7 8.9
460x85 11.7 11.0 10.4 9.5
495x85 12.5 11.7 11.1 10.1
525x85 13.1 12.4 11.7 10.7
Legend for minimum grade GL18 GL17 GL15 GL13

Table 5: Option 3 Ultimate Bracing Capacity (kN)

GLT  member size Wall height (mm) Kit
2440 2590 2740 3000
230x65 4.4 3.7 3.1 2.4 STD200-150
260x65 5.6 5.3 4.5 3.4
295x65 6.1 5.7 5.4 4.9
330x65 6.6 6.2 5.8 5.3
360x65 7.0 6.6 6.2 5.7
395x65 7.5 7.0 6.7 6.1
425x65 7.9 7.4 7.0 6.4
460x65 8.4 7.9 7.5 6.8
495x65 8.9 8.4 7.9 7.2
195x85 3.5 2.9 2.5 1.9 STD320-150
230x85 5.8 4.8 4.1 3.1
260x85 8.4 7.0 5.9 4.5
295x85 9.6 9.0 8.5 6.5
330x85 10.4 9.7 9.2 8.4
360x85 11.0 10.4 9.8 9.0
395x85 11.8 11.1 10.5 9.6
425x85 12.5 11.7 11.1 10.1
460x85 13.2 12.5 11.8 10.8
495x85 14.0 13.2 12.5 11.4
525x85 14.7 13.8 13.1 11.9
Legend for minimum grade GL18 GL17 GL15 GL13

Table 6: Option 4 Ultimate Bracing Capacity (kN)

GLT  member size Wall height (mm) Kit
2440 2590 2740 3000
230x65 4.4 3.7 3.1 2.4 STD200-150
260x65 5.1 4.8 4.5 3.4
295x65 5.6 5.3 5.0 4.5
330x65 6.1 5.7 5.4 4.9
360x65 6.5 6.1 5.8 5.3
395x65 7.0 6.6 6.2 5.7
425x65 7.4 7.0 6.6 6.0
460x65 7.9 7.4 7.0 6.4
495x65 8.4 7.9 7.5 6.8
195x85 3.5 2.9 2.5 1.9 STD320-150
230x85 5.8 4.8 4.1 3.1
260x85 8.0 7.0 5.9 4.5
295x85 8.8 8.3 7.8 6.5
330x85 9.6 9.0 8.5 7.8
360x85 10.2 9.6 9.1 8.3
395x85 11.0 10.4 9.8 9.0
425x85 11.7 11.0 10.4 9.5
460x85 12.5 11.7 11.1 10.1
495x85 13.2 12.5 11.8 10.8
525x85 13.9 13.1 12.4 11.3
Legend for minimum grade GL18 GL17 GL15 GL13

Table 7: Ultimate Bracing Capacity (kN/m)

Width (mm) Nominal wall height  Up to 2700 (mm) Kit
450 - 900 5.4 - 10.8 STD320-150

FAQs Short Wall Bracing

STD200 requires M20 anchor with minimum tie-down capacity of 36kN

STD320 requires M24 anchors with minimum tie-down capacity of 54kN

Slab shall be designed to accommodate the tie-down requirement. Depending on the concrete anchor manufacturers’ specifications, minimum 50mm slab edge distance might be required.

And if you cannot meet the tie-down requirements, Multinail Advance engineers can adjust the short wall brace bracing capacities for you accordingly with no issue!

We do have a load bearing option coming up soon! Prior to that, please send us the job and we will check the load bearing case by case.

No, you can’t at the moment. Glulam grade lower than GL13 is not tested, but it is on our to-do list. Stay tuned for our GL10 options!

Yes and no, it depends on the cross-section size. Multinail Advance glulam short wall brace undertook intensive amount of strength and serviceability checks, in order to get a final bracing capacity. In narrow widths (i.e. 195, 230, etc.), you can generally achieve more bracing with a higher grade GLT, while in wide widths (i.e. 495, 525, etc.), the bracing capacity stays the same for any GLT grade equal or higher than GL13.

Yes and no, it depends on the which Options you select for Multinail Advance GLT short wall brace. If you select the options with brackets outside of GLT then you can replace the steel truss with the same size GLT, but if you select the option of having brackets inside then no and you need 6mm allowance each side to accommodate bracket and screw head thickness.

For a quick reference, you can refer to the capacity provided for the closest smaller size as a conservative estimate. However, please contact Multinail Advance if you are going to use a different size or glulam grade, we can adjust the bracing capacity to suit your glulam properties.

When replacing the steel short wall brace with GLT version, sometimes it is not a one-to-one replacement. Depending on the brands and locations of the steel short wall brace, sometimes a narrower width GLT short wall brace can be installed with the same lateral bracing capacity as the steel short wall brace.

The capacities of the GLT short wall brace are governed by numerous factors such as GLT grade, section sizes, location of the short wall brace, wind zone (if the GLT is a load bearing element), and etc.

Below Table 1 shows a comparison study of a typical steel short wall brace vs Multinail Advance GLT short wall brace, based on the scenario of the short wall brace next to a window opening, where the required 85mm thick GLT short wall brace widths are generally narrower than the steel short wall brace.

 

Example No. Short wall brace types Nominal wall height (mm) Lateral bracing capacity Width required (mm)
1 Steel truss 2400 13.0 600
GLT – GL13 (85mm thick) 2400 13.1 480
2 Steel truss 2400 8.6 400
GLT – GL13 (85mm thick) 2400 9.0 295
3 Steel truss 2400 5.4 250
GLT – GL13 (85mm thick) 2400 5.6 250

 

However, when 65mm thick GLT is used for 70mm wall frame, wider GLT sections might be considered.

 

Example No. Short wall brace types Nominal wall height (mm) Lateral bracing capacity Width required (mm)
1 Steel truss 2400 13.0 600
GLT – GL13 (65mm thick) 2400 13.1

810

2 Steel truss 2400 8.6 400
GLT – GL13 (65mm thick) 2400 8.6 495
3 Steel truss 2400 5.4 250
GLT – GL13 (65mm thick) 2400 5.5 280

 

Multinail Advance is fully aware of the section size differences among all glulam manufacturers. Above widths in the tables and in the product brochure are shown as examples. The widths can be adjusted with updated bracing capacities accordingly. Please contact Multinail Advance if there’s any concerns.

Short Wall Bracing

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