Web Buckling and Web Crippling - Design and drawing of Steel Structure

TL;DR

Web buckling and web crippling occur when the vertical compressive stresses exceed the capacity of the section, resulting in local failure in the web of the beam.

Transcript

hello everyone in this video we are going to study about the another type of defect which occurred in case of the beams that is known as the web buckling and web crippling so let's start so whenever a heavy load or the reaction which is in form of the concentrated load or the reaction it occurs in a small area therefore what will happen if we calcu... Read More

Key Insights

• 🕸️ Web buckling occurs when the vertical compressive stresses near the center of the section exceed the critical buckling stress for the web acting as a column.
• 🕸️ Web crippling occurs when large bearing stresses develop at the junction of the web and flange, causing local buckling and failure of the web.
• ❤️‍🩹 Effective depths and load distribution angles are determined based on different end conditions to calculate the load carrying capacity of the section.
• 🍽️ Providing suitable stiffening plates or bearing plates can help prevent web crippling by increasing the width resisting the load.
• 🕸️ Rolled steel sections are more prone to web crippling, while built-up sections are more prone to web buckling.
• 🦺 Checking for web crippling is sufficient for ensuring the section's safety, as if the beam is safe in crippling, it will be safe in web buckling as well.
• 🕸️ Load distribution angles for web buckling and web crippling are different, with web crippling having a slope of 10 theta.

Questions & Answers

Q: What is web buckling in beams?

Web buckling occurs when the vertical compressive stresses near the center of the section exceed the critical buckling stress for the web. This causes the web to buckle about its original axis.

Q: What is web crippling in beams?

Web crippling occurs when large bearing stresses develop at the junction of the web and flange, resulting in local buckling and failure of the web. It can happen above the reaction or below the concentrated load.

Q: How can web buckling and crippling be prevented?

To prevent web buckling, the load carrying capacity of the section should exceed the externally applied load. This can be achieved by increasing the effective depth of the section or redistributing the area. To prevent web crippling, suitable stiffening plates or bearing plates can be provided to increase the width resisting the load.

Q: What is the difference between web buckling and web crippling?

Web buckling occurs when the web of the beam buckles about its original axis, while web crippling occurs when the web experiences local buckling and failure due to large bearing stresses at the junction of the web and flange.

Summary & Key Takeaways

• Web buckling occurs when the vertical compressive stresses near the center of the section exceed the critical buckling stress for the web acting as a column.

• Web crippling occurs when large bearing stresses develop at the junction of the web and flange, causing local buckling and failure of the web.

• Effective depths and load distribution angles are determined based on different end conditions and can be used to calculate the load carrying capacity of the section.