Calculate Wall Bracing - Part 2- Determine Wind Pressure
Summary
TLDRIn this educational video, the host delves into calculating wind pressure for wall bracing in building construction. Focusing on different wind directions, the video explains the use of tables 8.1 to 8.5 to determine lateral wind pressure, essential for structural integrity. The host provides a step-by-step guide on selecting the correct table based on roof pitch and building dimensions, ultimately calculating pressures for both the long and short sides of a building. Viewers are encouraged to subscribe for more informative content.
Takeaways
- 🏗️ This video is part two of a series on wall bracing, focusing on calculating wind pressure for different wind directions.
- 📚 The racking force of a building is determined using the method outlined in paragraph 8.3.4, or an alternative method in appendix F.
- 🔍 The alternative method is a simplified procedure that provides a more conservative (safer) solution, requiring more bracing.
- 💡 The video opts for a more economical approach by not using the alternative method, aiming for a balance between safety and cost.
- 📏 The total racking force for each story or level is calculated by multiplying the projected area of the building's elevation by the lateral wind pressure.
- 🌐 Calculations are performed for both the long and short sides of the building, considering two wind directions.
- 📊 The formula for calculating wind pressure is given in kilonewtons, where total racking force equals the area of elevation (in square meters) times the lateral wind pressure (in kiloPascals).
- 📚 Tables 8.1 to 8.5 are used to determine the lateral wind pressure, with specific tables applicable for different building configurations and roof pitches.
- 🏡 For the example building in the video, Table 8.2 is used for the long side and Table 8.4 for the short side, based on the building's dimensions and roof pitch.
- 📏 The building used in the example has a pitch of 30 degrees, is 14.840m long, and 7.270m wide.
- 💨 The lateral wind pressure for the long side of the building is calculated to be 1.1 kPa, and for the short side, it is 1.2 kPa.
Q & A
What is the main topic of the video?
-The main topic of the video is calculating wind pressure for wall bracing in building construction, specifically for different wind directions.
Why is the alternative method in Appendix F mentioned in the video?
-The alternative method in Appendix F is mentioned because it provides a simplified and more conservative solution for determining racking force, requiring more bracing.
What is the formula used to calculate the total racking force?
-The formula to calculate the total racking force is the area of elevation in square meters multiplied by the lateral wind pressure in kiloPascals.
How many wind directions are considered in the calculation?
-Two wind directions are considered: one acting on the long side and one on the short side of the building.
What tables are used to determine the lateral wind pressure for different building elevations?
-Tables 8.1 to 8.5 are used, with specific tables chosen based on the building's story, roof pitch, and whether the calculation is for the long or short side.
Why is it important to choose the correct table for the building's elevation?
-Choosing the correct table ensures accurate calculation of the lateral wind pressure, which is crucial for structural safety and compliance with building codes.
What is the lateral wind pressure for a building with a 30-degree pitch and 14.8 meters in length, according to Table 8.2?
-The lateral wind pressure for the long side of the building is 1.1 kiloPascals.
How does the building's width affect the selection of the lateral wind pressure value from Table 8.4?
-The building's width determines which width category to use in Table 8.4, as the table provides values for different width ranges, and the closest larger value should be selected if the exact width is not available.
What is the lateral wind pressure for the short side of a building with a 30-degree pitch and 7.2 meters in width, according to Table 8.4?
-The lateral wind pressure for the short side of the building is 1.2 kiloPascals.
What will be the focus of the next video in the series?
-The next video will focus on calculating the area of the building's elevations and then determining the racking force using the previously calculated wind pressures.
How can viewers stay updated with the video series?
-Viewers can subscribe to the presenter's YouTube channel or follow them on Facebook to receive updates on more videos in the series.
Outlines
🏗️ Wind Pressure Calculation for Building Bracing
This paragraph introduces the second part of a series on wall bracing, focusing on calculating wind pressure for different wind directions as per the building code's 8.3.4 clause. The presenter opts for a simplified, more conservative method from Appendix F, which may require additional bracing but ensures safety. The formula for calculating the total racking force is explained, involving the area of elevation and lateral wind pressure, with the latter determined from tables 8.1 to 8.5. The importance of selecting the correct table based on the building's characteristics, such as the pitch of the roof and its dimensions, is emphasized. The example provided uses a building with a 30-degree pitch, 14.840m in length, and 7.270m in width, and demonstrates how to find the lateral wind pressure from the tables for both the long and short sides of the building.
📝 Next Steps in Calculating Racking Force
The second paragraph outlines the next steps following the determination of wind pressure on the building's elevations. The presenter informs viewers that in the subsequent video, they will calculate the area of the elevations to then determine the racking force. The paragraph concludes with a call to action, encouraging viewers to subscribe to the YouTube channel or follow on Facebook to stay updated with more informative content.
Mindmap
Keywords
💡Buildsum
💡Wall Bracing
💡Wind Pressure
💡Racking Force
💡Projected Area
💡Lateral Wind Pressure
💡Appendix F
💡Elevation
💡Pitch of the Roof
💡Long and Short Sides
💡Tables 8.1 to 8.5
Highlights
Introduction to part two of a series on wall bracing.
Explanation of wind pressure calculation for different wind directions.
Reference to paragraph 8.3.4 for racking force determination.
Introduction of the alternative method in Appendix F for a more conservative solution.
Selection of a more economical method for racking force calculation.
Description of the formula for calculating total racking force.
Mention of the need to calculate racking force in both long and short directions of the building.
Explanation of how to work out wind pressure in kilonewtons.
Identification of the relevant tables (8.1 to 8.5) for determining wind pressure.
Guidance on selecting the appropriate table based on the building's characteristics.
Details on using Table 8.2 for calculating wind pressure on the long side of the building.
Use of Table 8.4 for calculating wind pressure on the short side of the building.
Importance of knowing the pitch of the roof and the dimensions of the building.
Example calculation using a building with a 30-degree pitch and specific dimensions.
Results of lateral wind pressure calculation for the long side of the building.
Results of lateral wind pressure calculation for the short side of the building.
Upcoming steps to calculate the area of elevations and track force.
Invitation to subscribe to the YouTube channel and follow on Facebook for more content.
Transcripts
G'day and welcome back to Buildsum and in this video which is part two of the
series on wall bracing we're going to work out the wind pressure for both our
wind directions okay so paragraph 8.3.4
racking force says that the racking force of a building shall be
determined by using the method outline but in this clause all by using the
alternative method in appendix F now the alternative method is a simplified
procedure and it's going to give you a more conservative or safer solution so
it's going to require more bracing so we're going to go with the the more
economical type which would be this one here so the total racking force for each
story or level of the building shall be the product of the projected area of
elevation of the building multiplied multiplied by the lateral wind pressure
determined from Table 8.1 to 8.5 the total racking
force shall be calculated in both directions
long and short sides of the building so that's why we do two wind directions one
on the long side one on the short side okay so the formula to work out wind
pressure is done in kilonewtons and the formula is the total racking force
equals the area of elevation in square metres times by the lateral wind
pressure in kiloPascals which is what we're going to work out now I'll show
you how to look that up okay so it said there's four tables or five tables the
table 8.1 is for single story or upper story or the upper of
two-story buildings lower story and subfloor of a single story or two story
all vertical surfaces gable ends ski and ends flat wall surfaces so if your
buildings got a flat gable or a skillion you would use 8.1
8.2 is a single storey or up a storey of a two-story building the long length of
the building with with a hip or gable end which is going to be applicable for
us for our long side of the building 8.3 the lower storey or subfloor of a single
single storey or two storey okay so this is for the bottom floor on a two-storey
house long length for the building so it's not going to apply to us
8.4 a single story or upper story of a two-story building short end
of the building so this is again I'll apply to us that we're going to use
8.4 and 8.5 again is for the short end of the
building on the lower storey of a two-storey house so you have to make sure
you pick the right table for the building that you're actually going to
be working this out on so we're going to use 8.2 for our long side and 8.4
our short side so this is the table basically okay so you need a little bit
of information, you need to know what your pitch of your roof is and you
need to know how wide or how long your building is okay so this is Table 8.2
which is we're going to call wind direction one and this is acting on
the long side of the building all right remembering that our building the
building that I'm using for this series it had a pitch of 30 degrees
it was 14.840m long and 7.270m
wide okay so this is the example so if we look at the column four
thirty degrees and then course we're looking at the long side of the building
and our buildings 14.8 we're gonna have to use 15.0 so we
end up with a wind pressure or lateral wind pressure for this building of 1.1
acting on the long side of the building alright so we'll write that down somewhere
so 1.1 and then we'll look at the short side so the short side we're
using 8.4 this will be our wind direction 2 short side the building
similar table just different figures again 30 degree building so we're going
to use the 30 degree column and our buildings only 7.2 wide so we'll have to
use 8 can't go under so we use 8 as they're building widths and we get a
lateral wind pressure on the short side of 1.2 ok so we can write those down
wind prep direction 1 we're going to get a lateral wind pressure of 1.1 m kPa and
wind direction 2 we get a lateral wind pressure of 1.2 kPa okay so now we know
what pressure the wind is going to put on those elevations we can in the next
video we'll work out the area of those elevations and then we can calculate our
tracking force today 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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