Numerical on Net Sectional Area Calculation 2 - Design of Tension Members

TL;DR

Learn how to calculate the net sectional area for a plate connected to a gusset plate using a shortcut method.

Transcript

hello everyone in this video we are going to see a numerical on calculation of net sectional area and this is the second numerical so let's start with the video see the problem statement says determine the net area of plate of size 250 mm by 10 mm and joined to a gusset plate by 18 mm volts which is as shown in the figure below the diagram is given... Read More

Key Insights

• 🪐 Calculating the net sectional area requires considering all possible paths and applying a shortcut method to determine the minimum net area.
• ⚾ Chain paths are compulsory and should always be calculated, while staggered paths can be determined based on bolt count, pitch, and stagger criteria.
• #️⃣ The shortcut method involves selecting the path with the maximum number of bolts, less pitch, and minimum number of staggers to find the minimum net area.
• 🪐 It is important to differentiate between chain paths and staggered paths when calculating the net sectional area.
• 🪐 The minimum net area is determined by comparing the net areas of all possible paths and selecting the one with the lowest value.
• 🪐 Practice calculations may include determining the net area for additional paths, but these may not be necessary in an exam setting.
• 🍽️ The net sectional area calculation is specific to a plate connected to a gusset plate and may differ for other types of members.

Questions & Answers

Q: How do you determine the possible paths when calculating the net sectional area?

To determine the possible paths, you need to identify all chain paths (compulsory paths) and staggered paths. Chain paths follow a straight line, while staggered paths have diagonal components.

Q: What is the shortcut method mentioned in the video?

The shortcut method involves choosing the path with the maximum number of bolts, less pitch, and minimum number of staggers. This path is likely to have the minimum net sectional area.

Q: Can you explain the formula used to calculate the net area for a chain path?

The formula is A_n = b - n * d_h * t, where A_n is the net area, b is the plate width, n is the number of bolts, d_h is the diameter of the hole, and t is the plate thickness.

Q: Why are some paths ignored when calculating the net area?

Paths that do not meet the criteria of having the maximum number of bolts, less pitch, and minimum staggers are ignored. These paths are unlikely to have the minimum net area.

Summary & Key Takeaways

• The video explains how to calculate the net sectional area of a plate joined to a gusset plate using multiple paths.

• The first step is to identify all possible paths and then apply a shortcut method to determine the minimum net area.

• The video provides an example calculation for three chain paths and one staggered path.