Discussion
Assertion (A): The uprights of a diagonal tension field beam carry loads absent from an unbuckled beam.
Reason (R): The inclined tension bands pull the flanges inward and compress the uprights.
Select the correct answer from the options below.
Answer: B
Correct answer: Both A and R are true, and R is the correct explanation of A
Both are true and the reason gives the mechanism. Once the web buckles in shear it can no longer carry diagonal compression, so the shear is carried instead by inclined bands of tension. Those bands pull the flanges towards each other and place the uprights in compression - loads that simply do not exist in a beam whose web has not buckled. The uprights must therefore be designed as columns, which is Wagner’s tension field theory.
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