Calculate Wall Bracing - Part 8 - Distribution and Spacing
Summary
TLDRThis video, part eight of a series on wall bracing calculations, delves into the Timber Framing Code's distribution and spacing rules. The host explains how to evenly distribute bracing on external walls, particularly at building corners, and discusses the maximum distance between braced walls based on wind classifications. Using a table for N3 classifications, the video demonstrates how to calculate the required spacing for bracing units in two wind directions, accounting for the building's dimensions and roof pitch. The summary also touches on the need for additional bracing units to meet spacing requirements and the subsequent steps of tying them down to the floor and connecting them to the roof.
Takeaways
- 🏗️ The video is part of a series on calculating wall bracing, focusing on distribution and spacing rules in the Timber Framing Code.
- 📐 Bracing must be evenly distributed and provided in both directions, starting with external walls and corners of the building.
- 📏 For wind direction one, four sheets of bracing are needed, ideally placed at the four corners of the building for optimal distribution.
- 📏 For wind direction two, two 1.2m sheets of bracing are required, which may not fit in corners and must be placed along the walls.
- 🚫 The maximum distance between braced walls should not exceed nine meters for wind classifications up to N2.
- 📊 For wind classifications greater than N2, specific tables (8.20 for N3, 8.21 for N4) are used to determine the spacing of bracing.
- 🏠 The building's roof pitch and ceiling depth are critical factors in determining the required spacing between bracing units.
- 📐 For Wind Direction 1, bracing panels must be spaced every 6.7m, while for Wind Direction 2, the spacing is every 8.4m.
- 🔍 The building's width and the required spacing may necessitate additional bracing units to meet the code requirements.
- 🛠️ The video also discusses the need to tie down the bracing to the floor and connect the roof to the bracing units for structural integrity.
- 📺 The presenter encourages viewers to subscribe to the YouTube channel or follow on Facebook for more informative videos.
Q & A
What is the main topic of the video script?
-The main topic of the video script is calculating wall bracing in timber framing, focusing on the distribution and spacing rules according to the Timber Framing Code.
Why is distribution important in wall bracing?
-Distribution is important because it ensures that bracing is evenly placed, providing structural stability and resistance to forces such as wind from various directions.
What is the initial placement of bracing according to the script?
-The bracing should be initially placed on external walls and, where possible, at the corners of the building.
How many sheets were needed for wind direction one in the script's example?
-For wind direction one, four sheets were needed, which were conveniently placed at the four corners of the building.
What is the significance of the 1.2m sheet mentioned in the script?
-The 1.2m sheet is significant because it represents the size of the bracing unit that needs to be incorporated into the wall design, affecting how the bracing is distributed along the wall.
What are the maximum distances between braced walls as per the wind classifications?
-The maximum distance between braced walls should not exceed nine meters for wind classifications up to N2. For wind classifications greater than N2, specific tables are used to determine the spacing.
What is the role of Table 8.20 and Table 8.21 in determining bracing spacing?
-Table 8.20 is used for N3 wind classifications, and Table 8.21 is used for N4 classifications to determine the appropriate spacing between bracing units.
What is the ceiling depth and why is it relevant to bracing spacing?
-The ceiling depth is the measurement from the floor to the ceiling and is relevant because it helps determine the appropriate spacing of bracing units to resist wind forces effectively.
How does the building's width affect the number of bracing units needed?
-The building's width affects the number of bracing units needed because the spacing rules dictate how many units are required to cover the entire width, ensuring structural integrity.
What is the process for determining the number of extra bracing units needed due to spacing rules?
-The process involves calculating the required spacing based on the building's dimensions and wind direction, then comparing this to the actual distances between walls to determine if additional bracing units are needed to meet the spacing requirements.
What are the next steps after determining the number of bracing units and their placement?
-The next steps involve figuring out how to tie the bracing units down to the floor and how to connect the roof to them, ensuring a secure and stable structure.
Outlines
🏗️ Wall Bracing Distribution and Spacing in Timber Framing
This paragraph discusses the process of calculating wall bracing in the context of the Timber Framing Code, focusing on distribution and spacing rules. The speaker explains that bracing must be evenly distributed and initially placed on external walls, particularly at building corners. The video outlines the specific requirements for wind direction one and two, detailing the number of bracing sheets needed based on the building's dimensions and wind classifications. It also addresses the maximum distance between braced walls, referencing specific tables from the code for different wind classifications and explaining how to calculate the necessary spacing based on the building's roof pitch and ceiling depth.
📏 Adjusting Bracing Units Based on Spacing Rules
The second paragraph continues the discussion on wall bracing, emphasizing the need to adjust the number of bracing units based on the maximum allowed spacing as per the code. The speaker provides calculations for the required spacing of bracing units for two different wind directions, taking into account the building's width and other relevant dimensions. It is highlighted that for Wind Direction 1, bracing units must be spaced every 6.7 meters, while for Wind Direction 2, the spacing can be slightly more flexible at 8.3 meters. The paragraph concludes with the speaker planning to add extra bracing units to meet these spacing requirements, noting the challenges of placing them on internal walls and the implications for the building's design.
Mindmap
Keywords
💡Wall Bracing
💡Distribution
💡Spacing
💡Timber Framing Code
💡Wind Classification
💡Ceiling Depth
💡Roof Pitch
💡Bracing Units
💡Internal Walls
💡Tying Down
💡Building Width
Highlights
Introduction to part eight of the series on calculating wall bracing, focusing on distribution and spacing rules in the Timber Framing Code.
Requirement for bracing to be approximately distributed and provided in both directions, starting with external walls and corners.
Explanation of how to distribute four sheets of bracing for wind direction one, utilizing the building's corners.
Challenge of fitting 1.2m bracing sheets along a wall for wind direction two, not fitting in the corners.
Rule on maximum distance between braced walls, not exceeding nine meters for wind classifications up to N2.
Use of Table 8.20 for wind classifications greater than N2, specifically for N3 classifications.
Clarification on the use of clause 8.3.4.9 for lower stories of two-story constructions or other systems.
Determination of bracing spacing based on roof pitch and ceiling depth in relation to wind direction.
Calculation of required spacing for Wind Direction 1 as 6.7m and for Wind Direction 2 as 8.4m.
Need for additional bracing units due to spacing requirements, exemplified for Wind Direction 1.
Decision to place additional bracing on internal walls and the implications for wall packing.
Assessment that no extra bracing is needed for Wind Direction 2 due to building width.
Discussion on the next steps after determining the number of bracing sheets, focusing on tying them down to the floor and connecting the roof.
Invitation to subscribe to the YouTube channel or follow on Facebook for more informative videos.
Transcripts
G'day and welcome back to Buildsum and this is part eight on the series on
calculating wall bracing and this time we're going to look at the rule in the
Timber Framing Code on distribution and spacing so we've already worked out the
sheets that we need but there's a couple of other things we have to look at as
well so distribution and spacing bracing shall be approximately distributed and
shall be provided in both directions bracing shall be initially placed on
external walls and where possible at the corner of the building okay so as far as
distribution goes for wind direction one we had four sheets that we needed which
it's great so four corners and we just happen to have walls that work for us so
we can put those four sheets on the four corners and they're going to fit and so
they're well distributed okay for ceiling for wind direction too we had
two sheets remembering I worked out my bracing on 1.2m sheets so we have
to fit a 1.2m sheet somewhere along this wall so it's going to fit on this
wall in the corner pretty well for this wall not so much a 1.2m sheet won't
fit in this corner won't fit in this corner so I'm just gonna have to put it
along the wall somewhere so in this case I'm going to put it here could quite
easily have put it here doesn't matter but I can't give it in the corners okay
so that's the additional sheets that I worked out so the other rule that's
going to affect this is spacing so the maximum distance between braced walls
shall not exceed nine meters for wind classifications up to N2 and for wind
classifications greater than N2 we use Table 8.20 for N3
classifications or Table 8.21 four N4 classifications all
right and then for a lower story of two-story construction or other systems
we use clause 8.3.4.9
okay but that doesn't worry me I'm going to use Table 8.20
for N3 so here's a table here's our specs on our building the first thing we
need to know is the picture of our roof which is 30 degrees so we're going to
use this column here now the next little trick if you like is this column here
asked for the ceiling depth so the ceiling depth in comparison to the wind
direction okay so for Wind Direction 1 all right the ceiling depth pushing or
resisting that is 8m so it's the width of the building does get a
little bit confusing so the spacing that I need will be 6.7m so
I will have to have a bracing panel every 6.7m along Wind
Direction 1 for Wind Direction 2, all right my ceiling depth is effectively
14.8 okay so we could use 15vor thinking about it now
you're probably better off using 14vgo a little bit under okay
so we'd say our spacing is 8.4, it could even be 8.3
it's not going to matter because our buildings not even that wide so it's not
going to affect anything but I would probably err on the side of caution and
use the 8.3 okay so we know Wind Direction 2 we have to space
our bracing units every 8.4m for Wind Direction 1 we have to
space them every 6.7m so if I come back to my plan and look at
Wind Direction 1 and we need sheets every 6.7m so this
room here is 6.45m and then you've got more than 6m
back to this side so we're gonna have to have an extra
two sheets or two bracing units in this wall okay resisting this wind direction
so I'm going to put one there I'm going to put one there okay now they're on
internal walls that's going to be a pain because we're gonna have to then pack
one side of all those walls unfortunately on this place I don't have
any built-in wardrobes or anything that I could put them in the back of that
would be the better option okay but we need to have two extra sheets resisting
the wind in that direction okay and for Wind Direction 2 the spacing was
8.3 or we could say 8.3 as I said the building's only
7.5m wide so we don't need to have any extra sheets acting in
this window in this direction for Wind Direction 2 okay so now we've worked out
the sheets we actually need and how many extra sheets we need because of our wind
direction I'm sorry because of our spacing rule the next thing we have to
look at is how we tie them down to the floor and how we connect the roof to
them
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
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