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RE: Hooks on bottom reinforcing steel in pile caps

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Pilecaps usually have small span-to-depth ratios and behave more like strut-and-tie systems than flexural members.  The compression strut theoretically could push on the 90 degree hook and try to straighten it out so that the anchorage mechanism is impaired.  A 180 degree hook would perform better.  This is somewhat analogous to a concrete corbel, where the primary tension reinforcement requires a positive means of anchorage.

Jason Emoto

>>> Cliff Schwinger <clifford234(--nospam--at)> 11/05/04 08:43AM >>>
So what does a 180 hook do that a 90 hook can't do?

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