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ESE Civil 2017 Official Paper

Option 1 : SM_{1 }> SM_{2}

CT 3: Building Materials

3014

10 Questions
20 Marks
12 Mins

A beam column is a member which carries bending moment with axial compressive force.

Due to bending deflection (δ), the axial force P induces additional moment = P δ. This additional moment ‘P δ’ is called secondary moment.

In single curvature, moment will be more than that in double curvature because deflection δ in single curvature is more than that of double curvature. (Refer figure).

SM_{1} = Pδ_{1}

_{}

SM_{2} = Pδ2

Since δ_{1} > δ_{ 2}

**∴ SM _{1} > SM_{2}**