Building Construction
An arch may fail due to

Sliding of voussoirs
All listed here
Crushing of the material
Uneven settlement of abutments

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Building Construction
Negative skin friction

Both (A) and (B)
Neither (A) not (B)
Is a downward drag acting on a pile due to downward movement of the surrounding compressible soil relative to the pile
Develops due to lowering of ground water

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