Shear Lag Effect - Design and drawing of Steel Structure

TL;DR

Shear lag effect causes non-uniform stress distribution in tension members and beams, reducing their design strength.

Transcript

hello everyone in this video we are going to study about the shear leg effects which is prominent in case of tension members and the beams subjected to tensile forces so let's start so this shear lag effect it is the non-uniform stress distribution that occurs in a tension member or the beams which are subjected to the tensile forces adjacent to a ... Read More

Key Insights

• 🇱🇧 Shear lag effect causes non-uniform stress distribution in tension members and beams adjacent to connections.
• 😁 The design strength of tension members and beams is reduced due to shear lag effect.
• 🎏 The shear lag effect violates the assumption of uniform stress distribution in the pure bending equation.
• 🎏 Effective flange width is used to account for shear lag effect in design.
• 🎏 Section properties and deflection calculations are affected by shear lag effect.
• 🇮🇴 According to Indian standard code 800, shear lag effect may be ignored under specific conditions.
• 😁 Understanding shear lag effect is important for accurate calculations and design of tension members and beams.

Questions & Answers

Q: What is shear lag effect?

Shear lag effect is the non-uniform stress distribution that occurs in tension members and beams adjacent to a connection. It reduces the design strength of the member.

Q: Why does shear lag effect matter?

Shear lag effect matters because it violates the assumption of uniform stress distribution in the pure bending equation, affecting the design and calculations of tension members and beams.

Q: How is shear lag effect accounted for in design?

Shear lag effect is accounted for in design by considering the effective flange width, which assumes uniform stress distribution within a reduced width. This affects the section properties and deflection calculations.

Q: When can shear lag effect be ignored?

According to Indian standard code 800 2007 edition, shear lag effect may be ignored for outstanding members if the width is less than one-twentieth of the length, and for internal elements if the width is less than one-tenth of the length.

Summary & Key Takeaways

• Shear lag effect is the non-uniform stress distribution that occurs in tension members and beams adjacent to a connection.

• The effect reduces the design strength of the member because the entire cross section is not fully effective in the critical section.

• The shear lag effect violates the assumption of uniform stress distribution in the pure bending equation, requiring consideration in calculations and design.