Question:
When designing steel structures, one must ensure that the local buckling in webs do not take place. This check may not be very critical when using rolled steel sections because
When designing steel structures, one must ensure that the local buckling in webs do not take place. This check may not be very critical when using rolled steel sections because
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Local buckling of steel sections mainly depends on the width (or depth)-to-thickness ratio. Rolled sections are proportioned such that these ratios satisfy codal requirements.
Updated On: Jul 23, 2026
- Quality control at the time of manufacturing of rolled section is very good
- Web depths available are small
- Web stiffeners are in built in rolled sections
- Depth to thickness ratio (of the web) are appropriately adjusted
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The Correct Option is D
Solution and Explanation
Concept:
Local buckling in steel members occurs when thin plate elements buckle before the entire member fails. The susceptibility of a web to local buckling depends mainly on its width (or depth)-to-thickness ratio.
Rolled steel sections are manufactured with proportions satisfying codal limits, ensuring adequate resistance against local buckling.
Step 1: Identify the factor affecting local buckling. The critical parameter governing local buckling of a web is \[ \boxed{\frac{d}{t_w}} \] where \[ d=\text{Depth of web},\qquad t_w=\text{Thickness of web}. \] A smaller value of \(d/t_w\) increases the resistance to local buckling.
Step 2: Reason for rolled steel sections. Rolled steel sections are manufactured with appropriate web proportions so that \[ \boxed{\frac{d}{t_w}} \] remains within permissible limits specified in IS 800. Hence, local buckling is generally not a critical issue for rolled steel sections. Therefore, the correct option is \[ \boxed{(D)\;\text{Depth to thickness ratio (of the web) are appropriately adjusted}.} \]
Step 1: Identify the factor affecting local buckling. The critical parameter governing local buckling of a web is \[ \boxed{\frac{d}{t_w}} \] where \[ d=\text{Depth of web},\qquad t_w=\text{Thickness of web}. \] A smaller value of \(d/t_w\) increases the resistance to local buckling.
Step 2: Reason for rolled steel sections. Rolled steel sections are manufactured with appropriate web proportions so that \[ \boxed{\frac{d}{t_w}} \] remains within permissible limits specified in IS 800. Hence, local buckling is generally not a critical issue for rolled steel sections. Therefore, the correct option is \[ \boxed{(D)\;\text{Depth to thickness ratio (of the web) are appropriately adjusted}.} \]
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