Calculate Wall Bracing - Part 5 - Design Bracing Systems - Nominal Bracing - Wind Direction 2

Summary

In this fifth installment of the 'Buildsum' series, the focus is on calculating nominal wall bracing for Wind Direction 2. The tutorial demonstrates how to determine the effective length of walls that resist wind load, accounting for windows and panels shorter than 450mm. It calculates the bracing capacity for single and double-sided walls, revealing that nominal bracing provides 14.409 kN of resistance, over half the required 20.254 kN. The video concludes by determining the remaining bracing needed for Wind Direction 2, with a promise to explore further in the next episode.

Takeaways

• 🏗️ The video is part of a series on calculating wall bracing, focusing on Wind Direction 2.
• 💨 The wind is blowing against the building, and walls running in the same direction as the wind will resist the load.
• 📏 The script calculates the effective length of walls by subtracting the cavity, brickwork, and window openings.
• 🔢 For walls sheeted on one side only, the total effective length is 12.120m after adjustments.
• 📉 The bracing capacity for single-sided walls is 0.45, resulting in 5.45 kN of bracing for Wind Direction 2.
• 🚪 For double-sided walls, the effective bracing length is calculated after removing doorways, resulting in 8.955 kN of resistance.
• 📈 The total resistance from nominal bracing in Wind Direction 2 is 14.409 kN.
• 🔍 The original requirement for Wind Direction 2 was 20.254 kN of resistance, and nominal bracing provides more than half of that.
• 🚫 Nominal bracing can only be used for up to 50% of the required resistance, so additional bracing is needed.
• 🧩 The script concludes by determining that 10.127 kN of bracing is still required in Wind Direction 2.
• 📺 The presenter invites viewers to subscribe to the YouTube channel or follow on Facebook for more content.

Q & A

What is the main topic of this video?

The main topic of this video is calculating wall bracing, specifically focusing on nominal bracing from Wind Direction 2.

What is Wind Direction 2 in the context of this video?

In this video, Wind Direction 2 refers to the direction from which the wind is blowing against the side of the building.

Why are walls running in the same direction as the wind important?

Walls running in the same direction as the wind are important because they are the ones that resist the load and provide bracing.

How does the presenter calculate the effective length of the wall for bracing purposes?

The presenter calculates the effective length of the wall by subtracting the cavity, brickwork, and window openings from the total length of the wall.

What is the total effective length of the walls considered in the example?

The total effective length of the walls considered in the example is 12.120 meters.

What is the bracing capacity for nominal bracing single sided?

The bracing capacity for nominal bracing single sided is 0.45.

How much bracing in kN is calculated for Wind Direction 2 for single sided walls?

The calculated bracing for Wind Direction 2 for single sided walls is 5.45 kN.

What adjustments are made for double sided walls in terms of effective bracing area?

For double sided walls, adjustments are made by subtracting the areas occupied by doorways from the total wall length to determine the effective bracing area.

What is the total resistance in kN provided by the nominal bracing for Wind Direction 2?

The total resistance provided by the nominal bracing for Wind Direction 2 is 14.409 kN.

What is the remaining bracing requirement after considering the nominal bracing for Wind Direction 2?

After considering the nominal bracing, the remaining bracing requirement for Wind Direction 2 is 10.127 kN.

What is the limitation on the use of nominal bracing in the context of this video?

In the context of this video, nominal bracing can only be used for up to 50% of the total required bracing.

Outlines

00:00

🏗️ Calculating Wall Bracing for Wind Direction 2

This paragraph introduces part 5 of a series on calculating wall bracing, focusing on Wind Direction 2. The speaker explains the process of calculating the nominal bracing capacity for walls that resist the wind load. Walls are assessed for their effective length after accounting for windows and door openings. The example given involves a wall 14.840m long, from which the speaker subtracts the cavity and brickwork at both ends, as well as window openings, resulting in an effective bracing length of 5.81m. The process is repeated for another wall, yielding a total effective length of 12.120m. The bracing capacity for single-sided walls is multiplied by this length to find the total bracing force in Wind Direction 2. The paragraph also discusses the transition to double-sided walls, providing calculations for effective bracing areas and the total resistance in kN. The summary of the required bracing force is given as 14.409 kN, which is more than half of the originally needed 20.254 kN, indicating that nominal bracing can be used for up to 50% of the requirement.

Keywords

💡Bracing

Bracing in the context of this video refers to structural supports used in building construction to resist loads, particularly those caused by wind. It is a critical concept as it directly relates to the video's theme of calculating wall bracing for stability. The script discusses different types of bracing, including nominal bracing, and how they are calculated for Wind Direction 2.

💡Wind Direction 2

This term specifies a particular direction from which the wind is blowing relative to the building, which is essential for calculating the forces that the building needs to resist. In the script, Wind Direction 2 is used to illustrate the specific scenario where the wind is blowing against one side of the building, affecting the bracing calculations.

💡Nominal Bracing

Nominal bracing is a term used to describe a specific capacity of bracing that can be provided by the structural elements of a building, such as walls. The script explains how to calculate the nominal bracing for Wind Direction 2, which is a foundational step in determining the overall bracing requirements.

💡Wall Bracing Capacity

Wall bracing capacity refers to the ability of a wall to resist forces, such as those from wind. The script provides specific values for single-sided and double-sided walls, demonstrating how these capacities are used in the calculation of the total bracing needed for Wind Direction 2.

💡Single-Sided and Double-Sided Walls

These terms differentiate between walls that have bracing elements on one side versus both sides. The script explains how to calculate the effective bracing for each type, with single-sided walls having a bracing capacity of 0.45 kN and double-sided walls being calculated differently.

💡Effective Wall Length

Effective wall length is the measure of the wall's length that can contribute to bracing, excluding areas like windows and doorways. The script uses this concept to calculate the total length of walls that can be used for bracing after subtracting openings and other non-bracing elements.

💡Resistance

In the context of the video, resistance refers to the force that the bracing system can withstand. The script calculates the total resistance provided by the nominal bracing and compares it to the required resistance to ensure the building's stability against wind loads.

💡Load

Load in this video is the force exerted on the building by external factors, such as wind. The script discusses how walls running in the same direction as the wind will resist this load, which is a key consideration in the bracing calculation process.

💡Cavity

A cavity in construction refers to a space within the wall, often used for insulation. The script mentions subtracting the cavity's width from the total wall length to determine the effective length of the wall that contributes to bracing.

💡Window Openings

Window openings are areas in the wall where windows are installed. The script details how these openings are subtracted from the total wall length to find the effective bracing length, as they reduce the wall's capacity to resist wind loads.

💡Doorways

Doorways are similar to window openings but for doors. The script explains how to calculate the effective bracing length by subtracting the total length of doorways from the wall's total length, as they also reduce the wall's bracing capacity.

Highlights

Introduction to part 5 of the series on calculating wall bracing, focusing on Wind Direction 2.

Explanation of how wind direction impacts wall bracing, specifically for walls running in the same direction as the wind.

Calculation of effective wall length by subtracting the cavity and brickwork from the total wall length.

Accounting for window openings in the calculation of effective wall length for bracing capacity.

Determination of total effective wall length for single-sided bracing calculation.

Use of the bracing capacity factor for nominal bracing single-sided to calculate the resistance in Wind Direction 2.

Transition to calculating double-sided wall bracing, including the effective length after accounting for doors.

Calculation of effective bracing area for Wall 1 and Wall 2 in double-sided configuration.

Application of the bracing capacity factor for double-sided walls to determine resistance.

Combining single and double-sided bracing resistance to find the total resistance in Wind Direction 2.

Comparison of the required bracing resistance with the calculated nominal bracing capacity.

Understanding the 50% limit for using nominal bracing and the calculation of additional bracing needed.

Conclusion on the amount of actual bracing required beyond nominal bracing for Wind Direction 2.

Teaser for the next video where the presenter will discuss the additional bracing needed for the building.

Call to action for viewers to subscribe to the YouTube channel for more informative videos.

Invitation to follow on Facebook to stay updated with the latest videos on building construction.

Transcripts

G'day and welcome back to Buildsum and this is part 5 in the series of

calculating wall bracing and this time we're looking at the nominal bracing

from Wind Direction 2 so continuing on from the last video this time we're

going to look at Wind Direction 2 which is over here blowing into this side of

the building so it's blowing against this wall so the walls running in the

same direction as the wind are the ones that are actually going to resist the

load so first we're gonna look at walls sheeted on one side only so we've got

this wall here which is 14.840m long I'll take off 0.48 which is the

cavity and the brickwork take that off twice, okay, for both ends, and then what

I've done so just taken away all the window

opening so I've just added them up at that came to 8.55 so I take all

that away I get effectively 5.81m

from this wall and if I go to Wall 2 I get 6.31m out

of this wall that I have an effective wall space or wall size to use so that's minus

all my windows and it's minus any panels that would be less than 450mm

long because we can't use those so that gives me a total length of those walls

of 12.120m and it times that by our bracing capacity

for nominal bracing single sided which is 0.45 gives me 5.45 kN of bracing in Wind Direction 2 for single sided. To go to double sided

walls so Wall 1 a total of 5m I've taken away at 900 for both

doors gives me 3.5m effective bracing there and then Wall 2

which is longer one here 11.14 long taken away

2.7 for all the doorways gives me an effective area of a length

of 8.44, add them together times it by the bracing

capacity for double-sided walls gives me 8.955 kN

of resistance in that direction so add them together and I get

14.409 kN of resistance acting on Wind Direction 2. Okay, so we know if you

look at Wind Direction 2 we originally needed 20.254 kN of

resistance our bracing is actually going to give us nominal bracing is going to

give us 14.409 kN which is more than half of that and

remember we can only use nominal bracing for 50% okay so instead of

just minus in that all we can really do is take our 20.254

divide that by two so we have 10.127 kN of bracing still required in

Wind Direction 2 okay so now we've worked out the nominal bracing we now

know how much actual bracing we need to add into the building and that's what I

look at 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 Facebook

so you don't miss out on more great videos