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Consider the following statements about a diagonal tension field web:

1. It is permitted to buckle in shear well below its ultimate load.

2. After buckling it carries load as inclined tension bands.

3. The flanges and uprights are unaffected by the post-buckled behaviour.

Which of the statements given above is or are correct?

  • A.2 and 3 only
  • B.1, 2 and 3
  • C.1 and 2 only
  • D.1 and 3 only

Answer: C

The first two describe Wagner's result correctly. The third is false and is the practical catch: the tension field pulls the flanges inward and compresses the uprights, so both must be designed for loads that would not exist if the web had not buckled.

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