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6th Edition

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Publisher: Cengage Learning

ISBN: 9781337094740

Chapter 7, Problem 7.11.7P

Textbook Problem

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Design a welded connection for an MC

**a**. Use LRFD.

**b**. Use ASD.

To determine

**(a)**

The design of a welded connection using Load and Resistance Factor Design (LRFD).

**Given:**

Figure-(1)

**Concept Used:**

Write the expression for the maximum size of the weld.

Here, the maximum size of the weld is

Write the expression for the minimum size of the weld.

Write the expression for the required length of the weld in longitudinal direction.

Here, the length of the weld in the longitudinal direction is

Write the expression for the required length of the weld.

Here, the factored load is

Write the expression for the factored load.

Here, the dead load is

Write the nominal weld strength equation per unit length.

Here, the nominal weld strength is

Write the expression for the nominal strength of the weld per unit length.

Here, the weld size is

Write the expression for the shear strength of the base metal in yielding.

Here, the shear strength of the base metal in yielding is

Write the expression for the shear strength of the base metal in rupture.

Here, the shear strength of the base metal in rupture is

Write the expression for the longitudinal length of the weld.

Here, the capacity of weld in longitudinal direction is

Write the expression for the capacity of the longitudinal weld.

Here, the load capacity of the weld is

Write the expression for the load capacity of the weld in longitudinal direction.

Here, the load capacity of the weld in longitudinal direction.

Write the expression for the load capacity of the weld in transverse direction.

Here, the load capacity of the weld in transverse direction.

Check the strength of the weld in block shear.

Write the expression for the block shear.

Here, the required strength of the weld is

Write the expression for the gross area of the weld.

Write the expression for the net area of the weld.

**Calculation:**

Calculate the maximum size of the weld.

Substitute

Calculate the minimum size of the weld.

Hence, adopt weld of thickness

Calculate the factored load.

Substitute

Calculate the nominal strength of the weld per unit length.

Substitute

Calculate the nominal weld strength equation per unit length.

Substitute

Calculate the shear strength of the base metal in yielding.

Substitute

Calculate the shear strength of the base metal in rupture.

Substitute

The strength of the base metal is the minimum of the shear strength in yielding and rupture.

Thus, the strength of the base metal is

To determine

**(b)**

The design of a welded connection using Allowable Strength Design (ASD).

Steel Design (Activate Learning with these NEW titles from Engineering!)

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