Building Construction
Negative skin friction

Neither (A) not (B)
Both (A) and (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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Building Construction
Rotary drilling

Hinders the ground water observations and permeability test
All listed here
Is not suitable for deposits containing very coarse gravel
Is not economical for holes of less than 10 cm

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Building Construction
In a colar beam roof

There is no horizontal tie beam
There are two horizontal ties, one at the feet and other at the middle of the rafters
There is a horizontal tie at the feet of rafters only
There is a horizontal tie at almost the middle of rafters only

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