Calculate Wall Bracing - Part 7 - Design Bracing Systems - Walls

Summary

In this segment of the Buildsum series, the focus is on determining the quantity of wall bracing units required. The video calculates the need for 4 sheets of plywood bracing for Wind Direction 1 and 2 sheets for Wind Direction 2, totaling 6 sheets. It uses Method H with Method B fixing, providing 7.2 kN resistance per sheet. Additional rules are highlighted, such as the minimum length of bracing panels and the capacity adjustments for different panel sizes, ensuring viewers understand the importance of adhering to these standards for effective wall bracing.

Takeaways

• 🏗️ The video discusses calculating the number of bracing units needed for walls in a construction project.
• 📝 The requirement for Wind Direction 1 is 26.758 kN of force resistance, and bracing method H with Method B fixing is chosen, providing 6.0 kN per meter.
• 📐 Each street is 1.2m wide, and the calculation for the number of sheets needed is 26.758 / (6.0 * 1.2) = 3.7, rounded up to 4 sheets.
• 🔢 For Wind Direction 2, 10.127 kN of resistance is needed, and using the same method, 10.127 / 7.2 = 1.4, requiring 2 sheets.
• 📚 A total of 6 sheets of ply are needed for bracing, combining both wind directions.
• 📏 The minimum length for any plywood bracing panel is 900mm, and changing the width to 900mm can reduce the bracing capacity.
• 🔄 For bracing type H with Method A fixing, the minimum width can be reduced to 600mm, but the bracing capacity is halved compared to a 900mm panel.
• ⚖️ If a panel is shorter than 900mm, the bracing capacity can be calculated incrementally based on the panel's length.
• 🔄 The video mentions that there are additional rules to adhere to, which will be covered in the next video.
• 👍 The presenter encourages viewers to subscribe to the YouTube channel or follow on Facebook for more videos.

Q & A

What is the main topic of this video?

The main topic of this video is calculating the number of bracing units required for walls based on the resistance needed against wind forces.

What is the total force of resistance needed in Wind Direction 1?

The total force of resistance needed in Wind Direction 1 is 26.758 kN.

Which bracing method and fixing method are chosen for the calculation?

The chosen bracing method is H with Method B fixing, which provides a total resistance of 6.0 kN per meter.

How wide are the streets for the bracing calculation?

Each street is considered to be 1.2 meters wide for the bracing calculation.

What is the force of resistance provided by one sheet of ply when using the chosen bracing method?

Using the chosen bracing method, one sheet of ply provides 7.2 kN of resistance.

How many sheets of ply are needed to meet the resistance requirement for Wind Direction 1?

Approximately 4 sheets of ply are needed to meet the resistance requirement for Wind Direction 1.

What is the force of resistance required in Wind Direction 2?

The force of resistance required in Wind Direction 2 is 10.127 kN.

How many sheets of ply are needed for Wind Direction 2 based on the chosen bracing method?

2 sheets of ply are needed for Wind Direction 2 based on the chosen bracing method.

What is the minimum length of any plywood bracing panel according to the rules mentioned in the video?

The minimum length of any plywood bracing panel should be 900 millimeters.

What is the exception to the minimum width rule for bracing type H?

The exception for bracing type H is that the minimum width can be reduced to 600 millimeters with Method A fixing.

How should the bracing capacity be calculated for a panel with a length of 600 millimeters?

For a panel with a length of 600 millimeters, the bracing capacity should be half that of a 900 millimeter panel.

What is the total number of sheets needed for bracing as per the video's calculation?

The total number of sheets needed for bracing is 6.

Outlines

00:00

🏗️ Calculating Plywood Bracing Units for Wind Resistance

In this segment, the presenter discusses the process of calculating the number of bracing units required for wall construction, specifically addressing the force of resistance needed against wind in two different directions. The method involves determining the total force needed (26.758 kN for Wind Direction 1 and 10.127 kN for Wind Direction 2) and then selecting an appropriate bracing method (Method H with Method B fixing) that provides 6.0 kN of resistance per meter. The presenter calculates the number of plywood sheets required by dividing the total force by the resistance per sheet (7.2 kN), resulting in 4 sheets for Wind Direction 1 and 2 sheets for Wind Direction 2, totaling 6 sheets. Additional rules about the minimum length of plywood bracing panels and the effect of changing panel dimensions on bracing capacity are also mentioned.

Keywords

💡Wall Bracing

Wall bracing refers to the structural support systems used to reinforce walls, typically against forces such as wind or seismic activity. In the video, the main theme revolves around calculating the necessary amount of bracing for walls, with the script detailing the process of determining the required resistance in Wind Direction 1 and Wind Direction 2.

💡BracIng Units

BracIng units are the individual components or sections of the bracing system. The script discusses how many of these units are needed based on the force of resistance required, which is calculated by dividing the total required force by the resistance provided per unit.

💡Force of Resistance

Force of resistance is the capacity of a structure to withstand external forces without failure. In the context of the video, it is measured in kilonewtons (kN) and is crucial for determining the appropriate amount of bracing needed to resist wind forces in two different directions.

💡Method H

Method H is one of the bracing methods mentioned in the script, which is used to calculate the total resistance provided by the bracing. It is associated with a specific fixing method, Method B, and is used to determine the resistance per meter of the bracing.

💡Method B Fixing

Method B fixing is a specific way of securing the bracing units in place. It is associated with Method H and contributes to the total resistance provided by the bracing system. The script uses this method to calculate the resistance per sheet of plywood used for bracing.

💡Plywood

Plywood is a type of engineered wood that is used as a material for the bracing panels in the video. The script mentions that the number of plywood sheets needed is calculated based on the required force of resistance and the resistance provided by each sheet.

💡Street Width

In the context of the video, street width refers to the width of each bracing unit, which is given as 1.2 meters. This measurement is used in the calculation to determine the resistance provided by each sheet of plywood.

💡BracIng Capacity

BracIng capacity is the amount of force a bracing unit can withstand. The script explains that this capacity is affected by the dimensions of the bracing panel, with a minimum width of 900mm for optimal capacity, and a reduced capacity for narrower panels.

💡Minimum Length

The minimum length specified in the script is 900mm, which is the smallest acceptable length for a plywood bracing panel to maintain its full bracing capacity. Shorter panels have a diminished capacity, which must be calculated accordingly.

💡Fixing Type

Fixing type refers to the method used to secure the bracing panels. The script mentions that for bracing type H, a different fixing method (Method A) is allowed, which permits a minimum width of 600mm instead of the standard 900mm.

💡Panel Length

Panel length is the measurement of the length of a bracing panel. The script notes that if the length of the panel is not the standard 900mm, the bracing capacity must be adjusted based on the actual length, with a formula provided to calculate this capacity.

Highlights

Introduction to part 7 of the series on calculating wall bracing.

Requirement of 26.758 kN of force of resistance in Wind Direction 1.

Selection of bracing method H with Method B fixing for a total resistance of 6.0 kN per metre.

Calculation of 7.2 kN per sheet by multiplying resistance per metre by street width.

Determination of needing 3.7 sheets of ply for the required bracing, rounded up to 4 sheets.

Explanation of using the same bracing method for Wind Direction 2 with a requirement of 10.127 kN.

Calculation for Wind Direction 2 resulting in the need for 2 sheets of ply.

Total requirement of 6 sheets of ply for wall bracing.

Minimum length rule for plywood bracing panels set at 900mm.

Exception for bracing type H with minimum width method A fixing allowing a width of 600mm.

Bracin capacity diminishes with width reduction to 600mm, requiring half the capacity of a 900mm panel.

Method for calculating bracing capacity for panels of different lengths.

Note on incremental capacity calculation based on panel length.

Upcoming video to cover additional rules and considerations for wall bracing.

Invitation to subscribe to the YouTube channel for more educational content.

Suggestion to follow on Facebook for updates on new videos.

Transcripts

GDay and welcome back to Buildsum and this is part 7 of the series on

calculating wall bracing and this time we're looking at how many bracing units

we actually need for the walls that we're going to put in okay so you should

be pretty familiar with this information basically, we needed

26.758 kN of force of resistance in Wind

Direction 1 so I'm gonna choose bracing method H or bracing H with a

Method B fixing which gives me a total resistance of 6.0 kN per metre

okay and lets apply the bracing method so each street will be 1.2m

wide so 6.0 x 1.2 gives me 7.2 kN per sheet so

if I know that I can get 7.2 kN out of a sheet all I have to do is

divide the 26.758 by 7.2and that tells me I

need 3.7 sheets of ply to get my required bracing so I'm going to

say I need 4 sheets of ply bracing fixed using method H or requirement H

Method B fixing okay so for sheets on that for Wind Direction 1, Wind

Direction 2 we needed 10.127 kN

of resistance again I'm going to use the same bracing method so

not having to worry too much about changing things through the jobsite

so I know it gives me 7.2 kN per sheet we needed 10.127 so 10.127 divided

by 7.2 equals 1.4

so I need 2 sheets in Wind Direction 2 so there we go all up at

the moment I need 6 sheets of ply for my bracing okay couple other little

rules to come up so the minimum length of any plywood bracing panel should be

900 okay and remember if you change the width to 900 then you're bracing

capacity it's going to diminish because it's, you know, it's bracing capacity is

metre rate the only exception to that would be for fixing type or for bracing

type H which is ply with minimum width method a fixing okay you can get down to

600 all right so however for a panel of 600 the bracing capacity should be half

that of a 900 panel so what you have to do to work the

bracing capacity out for that is you would work out what a 900 panel was and

you would Harve it okay and then if you wanted to get really picky and you had a

panel length of say 750 you could calculate okay that capacity right so

you'd work out you know what the difference was between a 900 sheet in a

600 sheet and you could actually calculate the capacity you would work up

incrementally based on the length of your panel okay but that's just a little

side note so any way we know we need 6 sheets now that's what it actually works

out but there are a couple other little rules and you have to adhere to and I'll

cover those in the next video. Gday 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

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