The 'tension field action' in a plate girder web after buckling means:
Choose the correct answer
The entire web resists only compressive stresses
Post-buckling diagonal tension strips carry additional shear — web acts like a diagonal tension field after shear buckling
The web is replaced by stiffeners only
Flanges carry all shear and web carries none
Correct Answer
B. Post-buckling diagonal tension strips carry additional shear — web acts like a diagonal tension field after shear buckling
Why is this the answer?
Tension field action: after the web buckles in shear (diagonal compression buckles, diagonal tension survives). The web carries additional shear beyond elastic shear buckling strength by acting like diagonal tension strips (truss analogy). Flanges and vertical stiffeners act as chord/posts of this truss. IS 800 allows design using tension field where the web to flange connection can resist the tension field forces.
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