Calculate Wall Bracing - Part 3 - Calculate the Area of Elevation and Calculate the Racking Force.
Summary
TLDRIn this third installment of the 'Buildsum' series, the focus is on calculating wall bracing, specifically determining the end elevation and the racking force exerted by wind loads on a building. The video explains how to calculate areas for both wind directions, considering roof pitch and building dimensions, and then uses these to determine the racking forces for each wind direction. With a clear demonstration of the process, the video prepares viewers for the next step: incorporating sufficient bracing to resist these forces.
Takeaways
- 🏗️ The video is part of a series on calculating wall bracing, focusing on determining end elevation and calculating racking force due to wind loads.
- 📐 The process starts by examining wind direction one, which impacts the long side of the building, and only half of the wall elevation needs to be calculated.
- ⚠️ Eaves are not considered unless they extend more than a meter beyond the wall, simplifying the calculation.
- 📏 The building's dimensions, such as length, width, and wall height, are essential for calculating the area of the wall and roof affected by wind.
- 📐 The area of the wall is calculated by multiplying the building's length by half the wall height, while the roof area requires additional geometric considerations.
- 📐 For the roof, the area is determined by creating a rectangle from the triangle formed by cutting off the eave and using trigonometric functions related to the roof pitch.
- 🔢 The total area for wind direction one is calculated to be 43.553 square meters, combining both wall and roof areas.
- 🌪️ The racking force is calculated by multiplying the wind pressure by the total area of the elevation, resulting in forces for different wind directions.
- 🌪️ Wind direction one has a wind pressure of 1.1 kiloPascals, leading to a racking force of 47.908 kiloPascals acting on the building.
- 🌪️ Wind direction two, with a higher wind pressure of 1.2 kiloPascals, results in a racking force of 20.254 kiloPascals on the building.
- 🛠️ The next step, as hinted in the video, is to ensure the building has adequate bracing to resist the calculated racking forces.
Q & A
What is the main topic of the video?
-The main topic of the video is calculating wall bracing and determining the racking force due to wind loads on a building.
What is the significance of wind direction in the context of this video?
-Wind direction is significant because it affects how the wind loads are applied to the building, and the video specifically discusses wind direction one, which is the wind blowing onto the long side of the building.
What is the process for determining the area to be calculated for wind loads?
-The process involves calculating only half of the wall elevation and not considering the eaves unless they extend more than a meter past the outside of the wall.
What is the roof pitch mentioned in the video?
-The roof pitch mentioned in the video is 30 degrees.
How is the half span of the building calculated in the video?
-The half span is calculated by using the building's length and the roof pitch, which gives a half span of 3.635 meters.
What is the formula used to calculate the area of the wall in the video?
-The formula used is the length of the building multiplied by half the wall height.
How does the presenter simplify the calculation of the roof area?
-The presenter simplifies the calculation by creating a rectangle from the triangular roof area by cutting it off and sticking it next to the wall area.
What is the calculated area of the roof for wind direction one?
-The calculated area of the roof for wind direction one is 23.519 square meters.
How is the total elevation area for wind direction one calculated?
-The total elevation area for wind direction one is calculated by adding the area of the wall and the area of the roof, resulting in 43.553 square meters.
What is the wind pressure for wind direction one mentioned in the video?
-The wind pressure for wind direction one is 1.1 kiloPascals.
How is the racking force due to wind direction one calculated?
-The racking force is calculated by multiplying the wind pressure by the total elevation area, resulting in a force of 47.908 kiloPascals.
Outlines
🏗️ Calculating Wall Bracing and Racking Force
This video segment focuses on the third part of a series on calculating wall bracing. The host explains how to determine the end elevation and calculate the racking force due to wind loads on a building. They discuss wind direction one, which impacts the long side of the building, and emphasize that only half of the wall elevation needs to be calculated. The video provides a diagram and notes on the calculation process, including the exclusion of eaves unless they extend more than a meter past the wall. The roof pitch of 30 degrees and the building dimensions are used to calculate the wall and roof areas, which are then combined to determine the total area for wind direction one. The process is repeated for wind direction two, and the areas are used to calculate the racking force for both wind directions, with wind direction one having a pressure of 1.1 kiloPascals and wind direction two having a pressure of 1.2 kiloPascals.
📢 Engaging with Buildsum's Content
In this brief segment, the host encourages viewers to engage with their content by subscribing to their YouTube channel or following them on Facebook. This call to action ensures that viewers stay updated with more informative videos on similar topics, highlighting the importance of continuous learning and engagement in the field of construction and engineering.
Mindmap
Keywords
💡Wall Bracing
💡End Elevation
💡Racking Force
💡Wind Loads
💡Eaves
💡Roof Pitch
💡Half Span
💡Area Calculation
💡KiloPascals
💡Wind Direction
💡Building Length and Width
Highlights
Introduction to part 3 of the series on calculating wall bracing.
Focus on determining the end elevation and calculating racking force from wind loads.
Explanation of wind direction one affecting the long side of the building.
Diagrammatic representation of calculating only halfway up the wall elevation.
Clarification on not needing to calculate eaves if they don't extend more than a meter past the wall.
Calculation of the wall area using the building's length and half the wall height.
Method to calculate the roof area by transforming the triangle into a rectangle.
Determination of the roof pitch's impact on the calculation using a 30-degree angle.
Combining the wall and roof areas to find the total area for wind direction one.
Process for calculating the wall and roof areas for wind direction two.
Inclusion of the building's width and half the wall height in the calculation for wind direction two.
Use of previous calculations to determine the roof height for wind direction two.
Total area calculation for wind direction two combining roof and wall areas.
Calculation of racking force for wind direction one using wind pressure and elevation area.
Determination of racking force for wind direction two with its specific wind pressure.
Summary of the forces acting on the building's elevation for both wind directions.
Teaser for the next video focusing on incorporating bracing to resist the calculated forces.
Call to action for viewers to subscribe and follow for more informative videos.
Transcripts
G'day and Welcome back to Buildsum and this is part 3 of the series on calculating wall bracing and in this
video we're going to look at determining the end elevation and then calculate the
racking force that our wind loads are going to put in our building okay so we
going to look at wind direction one first which is blowing onto the long side of our
building okay so this is the elevation of our building now the table at the top
of the table there's a little diagram and it points out that you don't have to
look at the whole wall elevation you only have to calculate from halfway up
the wall okay and there's also a little note at the bottom of the page there
somewhere that says that you don't have to worry about the eaves unless they
stick of more than a meter past the outside of your wall you don't have to
calculate the eaves as well so that yellow area there is basically what
we're going to calculate in this little step so a bit of information
so the roof ptch of 30 degrees we know the building length we know the
widths it gives us a half span of 3.635m which you'll see
why in the moment and our wall height in this case was 2.7 so to work
out the elevation of the wall area this half of the wall we're just going to go
the length of the building times by half the wall height which gives us an area
of 20.034 to work out the roof what I do is I instead of trying to work
these out separately I'm going to cut this triangle off and stick
it on over here and make this one rectangle okay so this length here is
the length of the roof - the half span of the building okay so length of the
roof - a half span gives us 11.205 the height of the roof okay because our
pitch is 30 degrees it's TAN 30 times the half span they
gives us the rise of the roof so that gives us 2.099 and if it times those
threw together 11.285 by 2.099it gives us an area of 23.519
for the roof so then we add the roof and the wall together
that gives us a total area of this elevation of 43.553
metres squared okay so we'll stick that in a little memory bank
somewhere we know that area we can then do wind direction too so the short end
of the building similar process we only have to work out half the wall and the
roof don't have to worry about the eaves so same information so to work out the
wall length or width of the building times half the wall height gave us
9.815 to work out the roof I've done the same as what I did
before cut this bit off stick it over here
make it a rectangle so the length of the building minus the half span gives us
the same number 3.635 we already know the height of the
roof from our previous calculation so 2.099 so times them
together we get a total area of our roof of 7.063 square
meters so the roof plus the walls gave us a total area factor wind direction
two of 16.578 square meters so now we know the areas
of our elevations we can calculate the racking force so remembering from the
the previous video that we had a wind direction one had a wind pressure of
1.1 kiloPascals our area of the elevation is 43.553
we times those together and we get a total racking force acting on wind
direction one of 47.908 so that's basically
kiloPascals acting on that area okay and then we do the same for wind direction -
wind direction 2 had a pressure of 1.2 kiloPascals times that by our elevation
there's the area of our elevation 16.878
okay gives us a total racking force on wind direction 2
of 20.254 so now we know what the force is that's
acting on our elevation and the next video we can start to look at getting
enough bracing into our building to actually resist that force 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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Calculate Wall Bracing - Part 1- Getting started
Calculate Wall Bracing - Part 2- Determine Wind Pressure
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