Calculate Wall Bracing - Part 3 - Calculate the Area of Elevation and Calculate the Racking Force.

Summary

In 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.