For a built-up column with lacing, what percentage of the axial load is considered as the transverse shear force (Vt ) that the lacing system must resist?

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RRB JE CE 22 Apr 2025 Shift 1 CBT 2 Official Paper

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Answer 1

Explanation:

According to IS 800: 2007 (General Construction in Steel – Code of Practice), for a built-up column with lacing, the transverse shear force (Vt) that the lacing system must resist is taken as 2.5% of the axial load.
This is specified in the code to account for the shear transfer between the lacing system and the main column.

Additional Information

Lacing System:

The lacing system consists of slanted members that connect the flanges of the built-up column, typically arranged in a criss-cross pattern.
It helps stabilize the column by resisting lateral forces.
The 2.5% figure is meant to represent the part of the axial load that is resisted by the transverse shear, which the lacing members contribute to.
This allows for efficient load transfer and ensures the column's stability under lateral loads such as wind or earthquake forces.
In actual design, this value might be adjusted depending on specific conditions, such as the column's dimensions, the material used, or the particular load scenario. However, 2.5% is the commonly used value under normal conditions as per IS 800.