Question

The design bending strength of laterally supported beam can be calculated for low shear case when the shear force in the member is _____ times that of design shear strength V_d of the member.
1. 0.4
2. 0.6
3. 0.8
4. 1.0

Answer 1

Correct Answer - Option 2 : 0.6

Concept: -

As per IS 800:2007, cl. 8.2.1.2,

The design bending strength of laterally supported beam can be calculated for low shear case when the shear force in the member is 0.6 times that of design shear strength V_d of the member.

Thus,

Design bending strength given by,

\({M_d} = {\beta _b}{Z_p}\frac{{{f_y}}}{{{\gamma _{mo}}}}\;\)

Here,

\({\beta _b} = \left\{ {\begin{array}{*{20}{c}} {1.0,\;for\;plastic\;and\;compact\;section}\\ {\frac{{{Z_e}}}{{{Z_p}}},\;for\;semi - compact\;sections} \end{array}} \right\}\)

f_y = Yield stress of the material

γ_mo = partial factor of safety

Z_e and Z_p­ = elastic and plastic section moduli of the cross-section respectively.