Calculate Wall Bracing - Part 4 - Design Bracing Systems - Nominal Bracing - Wind Direction 1

Summary

In this fourth installment of the 'Buildsum' series, the focus shifts to designing bracing systems for walls. The video explains the concept of 'nominal bracing,' which relies on internal lining materials like Gyprock. It outlines rules for using nominal bracing, such as its capacity to resist only 50% of the total racking force and exclusion of panels smaller than 450mm. Using the example of a house, the video demonstrates how to calculate the resistance provided by nominal bracing for both single and double-sided walls, ultimately determining the total resistance needed in Wind Direction 1. The video promises to address Wind Direction 2 in the next episode.

Takeaways

• 🏗️ The video discusses the design of bracing systems for walls, focusing on 'nominal bracing' as the initial topic.
• 📝 Nominal bracing is made up of internal lining materials such as Gyprock or villaboard, which play a crucial role in wall stability.
• ⚠️ There are limitations to using nominal bracing; it can only resist up to 50% of the total racking force in any direction.
• 📏 A panel size less than 450mm cannot be considered for nominal bracing calculations, emphasizing the importance of panel dimensions.
• 📚 The Timber Framing Code provides specific capacities for nominal wall bracing: 0.45 kN/m for single-sided walls and 0.75 kN/m for double-sided walls.
• 📐 The process involves calculating the total length of walls that contribute to bracing and multiplying by the bracing capacity to determine resistance.
• 🏡 In the example house, the total bracing capacity for single-sided walls is calculated by adding the lengths of the walls and multiplying by 0.45 kN/m.
• 🔢 For double-sided walls, the calculation is similar but uses the 0.75 kN/m capacity, resulting in a combined resistance from nominal bracing for Wind Direction 1.
• 📉 After calculating the resistance provided by nominal bracing, the video concludes that additional resistance is required beyond what nominal bracing can provide.
• 🌪 The video script also mentions that the next part of the series will address Wind Direction 2, indicating a continuation of the topic.
• 📺 The presenter encourages viewers to subscribe or follow on social media for more informative videos on similar topics.

Q & A

What is the main topic of this video?

The main topic of this video is the design and calculation of wall bracing systems, specifically focusing on nominal bracing.

What is the purpose of calculating the racking force on a wall?

The purpose of calculating the racking force on a wall is to determine the force that will act on the wall due to wind pressure, which is essential for designing the bracing to resist that force.

What is the wind direction that resulted in the highest racking force in the example provided?

Wind Direction 1 resulted in the highest racking force of 47.908 kN in the example provided.

What is the maximum percentage of the total racking force that nominal bracing can resist?

Nominal bracing can resist up to 50 percent of the total racking force in any direction.

Why can't a panel size less than 450mm be considered in the nominal bracing calculations?

A panel size less than 450mm cannot be considered in the nominal bracing calculations because it is too small to contribute effectively to the overall bracing capacity.

What are the bracing capacities per meter for single-sided and double-sided walls according to the Timber Framing Code?

According to the Timber Framing Code, the bracing capacity for single-sided walls is 0.45 kN per meter, and for double-sided walls, it is 0.75 kN per meter.

How is the total bracing capacity of nominal bracing calculated for single-sided walls in the example house?

The total bracing capacity for single-sided walls is calculated by adding the lengths of the walls (16.2m) and multiplying by the bracing capacity per meter (0.45 kN/m), resulting in 7.424 kN.

What is the total resistance from nominal bracing in Wind Direction 1 for the example house?

The total resistance from nominal bracing in Wind Direction 1 for the example house is 21.150 kN.

What is the remaining racking force that needs to be resisted after accounting for the nominal bracing in Wind Direction 1?

After accounting for the nominal bracing, the remaining racking force that needs to be resisted in Wind Direction 1 is 26.758 kN.

What is the next step after calculating the nominal bracing for Wind Direction 1?

The next step, as mentioned in the video, is to calculate the bracing for Wind Direction 2.