To ensure that compression flange of a beam is restrained from moving laterally, the cross section must be ____

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RRB JE CE 28 Aug 2019 (Shift 1) CBT 2 Official Paper
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  1. Semi-compact
  2. Slender
  3. Plastic
  4. Thin

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Option 3 : Plastic
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To ensure that the compression flange of the beam is restrained from moving laterally, the cross-section must be plastic or compact. If significant ductility is required, the section must invariably be plastic.

The different types of the section are as follows:

1. Plastic - Cross-sections, which can develop plastic hinges and have, the rotation capacity required for the failure of the structure by formation of a plastic mechanism, are called plastic sections. The stress distribution for these sections is rectangular.

2. Compact - Cross-sections, which can develop the plastic moment of resistance, but have inadequate plastic hinge rotation capacity for the formation of a plastic mechanism before buckling classed as compact sections. These cross-sections may develop fully plastic stress distribution across the entire cross-section but do not have adequate ductility. The stress distributions for these sections are rectangular.

3. Semi-compact– Cross sections, in which the extreme fiber in compression can reach yield stress but cannot develop the plastic moment of resistance due to local buckling are called semi-compact or non-compact sections. These sections are used in the elastic design and the stress distribution for such sections is triangular.

4. Slender – Cross sections in which the elements buckle locally even before the attainment of yield stress are classed as slender sections.

The cross-section which may develop plastic stress distribution fully but does not have adequate ductility is classified as a compact section.
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