Subject: Drilled Pier/pile-Support is
pinned or fixed
I am designing a pile/drilled
pier foundation for a building. I want to reduce the support forces so that
I can reduce the no. of piles/pier. The columns are almost 20m high. I would
like to know whether I can take base as pinned in analysis if I am using
singe piles/piers for each column. The pile/drilled piers are around 6 to 10
m deep. The piles/piers here are designed based on skin friction with a pile
socket length in rock of 3 to 6m. The rock is of poor quality with RQD (Rock
Quality Designation) 0% to 50%. These are from Geotechnical report. I would
like to mention that the soil up to 3 to 5m from Pile/Pier head is mainly of
hydraulic fill material. N value of top soil varies from 35 to 4. The site
is in a reclamation area.
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