Question:
In a plate girder, the web plate is connected to the flange plates by fillet welding. The size of the fillet weld is designed to safely resist
In a plate girder, the web plate is connected to the flange plates by fillet welding. The size of the fillet weld is designed to safely resist
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In a plate girder:
• Flanges resist bending moment.
• Web resists vertical shear.
• Welds transfer horizontal shear between the web and flanges.
• Flanges resist bending moment.
• Web resists vertical shear.
• Welds transfer horizontal shear between the web and flanges.
Updated On: Jul 23, 2026
- The bending stress in the flange
- The vertical shear force at the section
- The horizontal shear force between the flanges and the web plate
- The forces causing the buckling
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The Correct Option is C
Solution and Explanation
Concept:
In a plate girder, the web primarily resists shear, while the flanges resist bending moments.
The fillet weld joining the web to the flanges must transfer the horizontal shear developed due to bending between these components.
The horizontal shear flow is given by
\[
q=\frac{VQ}{I},
\]
where
\[
V=\text{Shear force},
\]
\[
Q=\text{First moment of area},
\]
and
\[
I=\text{Moment of inertia of the section}.
\]
Step 1: Identify the function of the weld. The weld transfers the longitudinal (horizontal) shear between the web and the flange. Without adequate weld strength, \[ \text{Flange and web would act independently.} \]
Step 2: Determine the governing force. The fillet weld is designed so that it safely carries \[ \boxed{\text{Horizontal shear force between the flange and web}.} \] It is not designed primarily for bending stress, vertical shear, or buckling forces. Therefore, the correct option is \[ \boxed{(C)\;\text{The horizontal shear force between the flanges and the web plate}.} \]
Step 1: Identify the function of the weld. The weld transfers the longitudinal (horizontal) shear between the web and the flange. Without adequate weld strength, \[ \text{Flange and web would act independently.} \]
Step 2: Determine the governing force. The fillet weld is designed so that it safely carries \[ \boxed{\text{Horizontal shear force between the flange and web}.} \] It is not designed primarily for bending stress, vertical shear, or buckling forces. Therefore, the correct option is \[ \boxed{(C)\;\text{The horizontal shear force between the flanges and the web plate}.} \]
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