Post-buckling tension field action in the web of a plate girder increases:
Choose the correct answer
The bending capacity of the girder
The shear capacity beyond the elastic shear buckling load
The axial load capacity
Resistance to fatigue
Correct Answer
B. The shear capacity beyond the elastic shear buckling load
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After the web buckles in shear, a diagonal tension field develops (like a Pratt truss), carrying additional shear. This post-buckling reserve significantly increases the shear capacity. Tension field is anchored by flanges and transverse stiffeners.
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