Correct option is A
In
plate girders, the
web is a thin vertical plate that carries shear forces and contributes to the overall strength of the girder. However, due to its thinness, the web is susceptible to
local buckling under compressive stresses. To prevent this,
intermediate vertical stiffeners are used.
Functions of Intermediate Vertical Stiffeners:
1.
Prevent Local Buckling of the Web:
· The stiffeners divide the web into smaller panels, increasing its stability and buckling resistance.
2.
Improve Shear Capacity:
· By reducing the slenderness of the web, stiffeners enhance its ability to resist shear forces.
3.
Transfer Loads:
· In some cases, stiffeners help in transferring concentrated loads from the flange to the web.
| if d1/tw > 90 |
· Vertical stiffener are provided to prevent buckling of web due to diagonal compression. |
| if d1/tw > 200 |
· Horizontal stiffener or longitudinal stiffener provided above neutral axis in compression flange. they prevent buckling of web due to bending compressive stress. |
| if d1/tw > 250 |
· Additional horizontal stiffener are provided at neutral axis. these stiffeners prevent buckling of web between vertical stiffener due to shear force |
| if d1/tw > 400 |
· The section must be redesign. |
tw = thickness of web
