Question

Buckling of the compression flange of a girder, without transverse stiffeners, can be avoided if (with standard notations)
1. \(\frac{d}{{{t}_{w}}}\le 345\epsilon _{f}^{2}\)
2. \(\frac{d}{{{t}_{w}}}\le 270\epsilon _{f}^{2}\)
3. \(\frac{d}{{{t}_{w}}}\le 345{{\epsilon }_{w}}\)
4. \(\frac{d}{{{t}_{w}}}\le 250{{\epsilon }_{w}}\)
5. \(\frac{d}{{{t_w}}} \le 67{\varepsilon _w}\)

Answer 1

Correct Answer - Option 1 : \(\frac{d}{{{t}_{w}}}\le 345\epsilon _{f}^{2}\)

As per IS 800:2007, CL 8.6.1.2, in order to avoid buckling of the compression flange into the web, web thickness shall satisfy the following:

1) When transverse stiffeners are not provided:

\(\frac{d}{{{t}_{w}}}\le 345\epsilon _{f}^{2}\)

2) When transverse stiffeners are provided: (C = spacing between stiffners)

a. When C ≥ 1.5d

\(\frac{d}{{{t}_{w}}}\le 345\epsilon _{f}^{2}\)

b. When C < 1.5 d

\(\frac{d}{{{t}_{w}}}\le 345{{\in }_{f}}\)