Calculate Wall Bracing - Part 1- Getting started

Summary

This video series explores calculating wall bracing for timber-framed houses in non-cyclonic areas, focusing on AS1684.2 standards. It discusses the importance of bracing for each story, wind exposure, and temporary bracing. The series will cover wind classification, wind pressure, elevation area, racking force, bracing system design, and connection checks.

Takeaways

• 🏠 The video series focuses on calculating wall bracing for timber-framed houses in non-cyclonic areas, following AS1684.2 standards.
• 📝 Bracing must be designed for each story of the house and the subfloor if required, considering different requirements for each level due to factors like wind exposure.
• 🌬 The direction of the wind that results in the greatest loading on the house should be used in calculations, typically the side with the largest surface area facing the wind.
• 🚧 Temporary bracing is needed during construction to support wind and construction loads, and it should be equivalent to at least 60% of the permanent bracing.
• 🔄 If temporary bracing is installed and left in place, it can become part of the permanent bracing system.
• 🌪 The wind classification for a building is determined by factors such as building height, terrain category, topographic classification, and shielding classification.
• 📈 Regulatory authorities like councils and private certifiers can provide wind classification information, or it can be found on various websites and documents.
• 🔗 The video description will include a link for more detailed information on determining wind classification for a specific area.
• 📐 The series will cover topics such as wind pressure calculation, area of elevation, racking force, bracing system design, and even distribution of bracing.
• 🔩 It's important to ensure that bracing is properly connected to the roof and floors to effectively transfer loads.
• 🔄 The presenter will continue the series with a focus on wind pressure in the next video.

Q & A

What is the main focus of the Buildsum series on calculating wall bracing?

The main focus of the series is to explain how to calculate and work out wall bracing for timber framing, specifically in non-cyclonic areas as per AS1684.2.

Why is it necessary to design bracing for each story of a house and the subfloor?

It is necessary because each story and the subfloor may have different requirements due to factors like wind exposure, and wind can blow from any direction.

What is the purpose of calculating the wind direction that results in the greatest loading?

The purpose is to determine the side of the house that presents the largest surface area facing the wind, which will give the greatest load for the bracing calculations.

What is the minimum percentage of temporary bracing required during construction compared to the permanent bracing?

Temporary bracing should be equivalent to at least sixty percent of the permanent bracing required.

Can temporary bracing be used as part of the permanent bracing if left in place?

Yes, if temporary bracing is installed and left in place, it can become part of the permanent bracing.

What are the main topics covered in the subsequent videos of the series?

The main topics include wind classification, determining wind pressure, calculating the area of elevation, racking force on the building, designing bracing systems for subfloor and walls, ensuring even distribution and spacing of bracing, and checking connections to the roof and ceilings.

How can one determine the wind classification for their area?

Wind classification can be determined by considering the building height, terrain category, topographic classification, and shielding classification. Information can be obtained from regulatory authorities, councils, private certifiers, or online resources.

What is the general wind classification for Sydney that the presenter uses as a starting point?

The presenter generally works on an N3 wind classification for Sydney, which is one of the higher classifications.

What is the importance of determining the wind pressure on walls?

Determining wind pressure is crucial to calculate how much bracing is needed to ensure the structural integrity of the walls against wind forces.

How can viewers stay updated with the Buildsum series?

Viewers can subscribe to the presenter's YouTube channel or follow on Facebook to receive updates on more videos in the series.

Outlines

00:00

🏗️ Wall Bracing Calculation Series Introduction

This video script marks the beginning of a series focused on calculating wall bracing, particularly for non-cyclonic areas as per AS1684.2, the timber framing code. The speaker emphasizes the importance of designing and providing bracing for each story of a house and the subfloor, considering different requirements for each due to factors like wind exposure. The script also touches on the necessity of considering wind direction for maximum loading in calculations and the concept of temporary bracing, which should be at least 60% of the permanent bracing. The series will cover topics such as wind classification, wind pressure, area of elevation, racking force, bracing system design, distribution and spacing of bracing, and connection to the roof and floors. The speaker provides a link for further information on determining wind classification, which is crucial for understanding the wind speed and its impact on wall bracing requirements.

05:04

🌬️ Upcoming Discussion on Wind Pressure

In the second paragraph, the speaker briefly announces the continuation of the series with a focus on wind pressure in the next video. They encourage viewers to subscribe to their YouTube channel or follow them on Facebook to stay updated on the series and receive more informative content. This paragraph serves as a teaser for the upcoming video and a call to action for the audience to engage with the channel for further educational content on the topic of wall bracing and construction.

Keywords

💡Buildsum

Buildsum appears to be the name of the series or the channel where this video is featured. It is likely focused on construction and building-related topics, given the content of the script. In the script, 'Buildsum' is mentioned as the introductory remark, indicating the start of the video series on a specific construction topic.

💡Wall Bracing

Wall bracing refers to the structural elements used to provide lateral support to a building's walls, ensuring stability and resistance to forces such as wind. In the video, the script discusses calculating wall bracing, emphasizing its importance in the structural integrity of buildings, especially in non-cyclonic areas as per AS1684.2.

💡AS1684.2

AS1684.2 is the Australian Standard for timber framing in non-cyclonic areas. It outlines the code for designing and constructing timber-framed buildings. The script specifically mentions this standard as the basis for the series on calculating wall bracing.

💡Racking and Shear Forces

Racking and shear forces are types of lateral forces that act on structures, causing them to deform or fail. In the context of the video, these forces are critical to consider when designing wall bracing to ensure the building can withstand such forces, as mentioned in section 8 of AS1684.2.

💡Wind Exposure

Wind exposure refers to the amount of wind a building or structure is subjected to, which can affect the design requirements for bracing. The script notes that the second floor of a house has more wind exposure and thus different requirements for bracing compared to the bottom floor.

💡Temporary Bracing

Temporary bracing is a type of support installed during the construction phase to handle wind and construction loads. The script mentions that it should be equivalent to at least 60% of the permanent bracing and can become part of the permanent bracing if left in place.

💡Wind Classification

Wind classification is a system used to categorize the potential wind forces a building may experience based on factors like building height, terrain, and topography. The script discusses determining wind classification as a crucial step in calculating the necessary wall bracing.

💡Wind Pressure

Wind pressure is the force exerted by the wind on the surface of a structure. The script indicates that after determining the wind classification, the next step is to calculate the wind pressure, which directly influences the design of wall bracing.

💡Elevation

In the context of the script, elevation refers to the vertical height of a building. It is a factor considered when determining wind classification and subsequently affects the calculation of wind pressure and required bracing.

💡Topographic Classification

Topographic classification categorizes the physical features of the land surrounding a building, such as hills or valleys, which can influence wind patterns and thus the design of wall bracing. The script mentions it as one of the factors to consider when determining wind classification.

💡Sheilding Classification

Shielding classification assesses the degree to which a building is protected from wind by surrounding structures or natural features. The script includes it as a factor in determining wind classification, which affects the calculation of wind pressure.

💡Connection

Connection in the script refers to the secure fastening of wall bracing to the roof, ceilings, and floors. It is highlighted as an essential aspect of ensuring that the bracing system functions effectively in maintaining the structural integrity of the building.

Highlights

The series focuses on calculating wall bracing, continuing from the AS1684.2 timber framing code for non-cyclonic areas.

Bracing must be designed and provided for each story of the house and the subfloor where required.

The wind direction that results in the greatest loading shall be used, considering the side of the house with the largest surface area facing the wind.

Temporary bracing is required to support wind and construction loads during building, equivalent to at least 60% of the permanent bracing required.

If temporary bracing is installed and left in place, it can become part of the permanent bracing.

The series will cover wind classification, determining wind pressure, area of elevation, racking force calculation, bracing system design, and checking bracing connections to the roof, ceilings, and floors.

To determine wind classification, consider building height, Terrain category, topographic classification, and shielding classification.

Regulatory authorities like councils and private certifiers may provide wind classification information, including maps and documents.

The presenter usually works on an N3 wind speed for Sydney, unless further investigation reveals the need for an N4 classification.

A link to a detailed document on wind classification for your area will be provided in the description.

The next video will focus on determining wind pressure based on the wind classification.

Viewers are encouraged to subscribe to the YouTube channel or follow on Facebook for more videos.

Transcripts

G'Day and welcome back to Buildsum and this is going to be a little bit of a

series on calculating wall bracing continuing on from my previous series on

on AS1684.2 the timber framing code for non-cyclonic

areas just kind of look more specifically at wall bracing and how you

calculate and work that out okay so obviously this is a comes from a s

AS1684.2 the timber framing code non-cyclonic it's a section

8 which is racking and shear forces bracing okay so the first paragraph says

that bracing has to be designed and provided for each story of the house and

the subfloor where required so you have a two-story house you have to design the

bottom floor and the second floor independently of each other it's

different requirements because of you know it's the second floor it's got more

wind exposure etc and also if you've got a subfloor for the houses up on piers

you have to design for that as well also as the wind can blow from any direction

the wind direction that results in the greatest loading shall be used so

basically the side of the house that presents the largest surface area facing

the wind we use that in our calculations and we generally we always calculate two

directions anyway so one blowing onto the front of the house and one blowing

onto the side of the house now if for some reason the front of your house

doesn't have much surface area and there's more white surface very at the

back then we reduce the back that's our biggest area and will give us our

biggest load so we always go with the largest surface area to work out our

loads just the note about temporary bracing temporary bracing is required to

support wind and construction loads on the building during construction

temporary bracing shall be the equivalent to at least sixty percent of

the permanent bracing required not something I really thought about

when I was erecting wall frames and sort of stuff but they say 60% temporary

bracing and if you do install temporary bracing and you want to leave it in

place it can then become part of the permanent bracing okay so what the

things we're going to look at in this series of videos is firstly is the wind

classification which we'll look at in this video and then in subsequent videos

we'll look at determining the wind pressure determining or working out the

area of elevation calculating the racking force on the building designing

bracing systems for the subfloor and for the walls checking that we've got even

distribution and spacing about bracing no point having all our braces on one

end of the building and the other ends got nothing in it and we then can can

check the connection of our bracing to the roof and ceilings and floors because

no point the walls bring braced if they're not bolted or connected to our

floor and connected into our roof system so to determine the wind classification

the wind classification or the design gust at wind speed should take into

account the building height the Terrain category the topographic classification

and the shielding classification now there's heaps of regulatory authorities

you know your council and your private certifiers they may provide you with

information they could give you a map to work it out or you can get them off a

lot of websites a lot of shed building companies have those for general

information and I'll put a link in the description shortly from one of those so

you can have a look or as I said you're Council or your private certifier they

may may just give you a wind classification for your area for Sydney

I generally work on an N3 which is getting up there it's one of the higher

ones for Sydney that's just my go-to wind speed unless

on investigation I find out that I need to get it N4

all right so you can work that out or your private certifier or a council can

give it to you there's a link I'll put that in the description so you can have

a look at that document in your own time and that's just there that's the link as

I said I'll put that in into the description that gives you a lot more

detail and shows you how to work out the wind classification for your own area so

once we have the wind classification we then need to work out what pressure that

is going to put on our wall which then we can work out how much bracing we need

so in the next video I'm going to look at wind pressure G'Day, I'm back just let

you know that if you like this video you can subscribe to my youtube channel or

you can follow me on Facebook so you don't miss out on more great videos