Pile Test for Earthquake Repair

by David J. Berti, Principal-in-charge; Jacobs Associates, San Francisco, CA,

Serial Information: Civil Engineering—ASCE, 1991, Vol. 61, Issue 12, Pg. 64-65

Document Type: Feature article


Load testing for existing concrete piles was specified as part of a seismic retrofit at the Port of Oakland after the Loma Prieta event. The Port wished to use heavier cranes at cargo berths and needed to know pile capacity without removing the piles. A concrete deck over the water prevented the use of a loading platform or the use of reaction piles. So a test was devised in which the pile to be tested was jacked against the deck while counterweights on the deck resisted the upward jacking force. A twin jack counterweight support system automatically controlled forces to the deck, protecting it from damage.

Subject Headings: Concrete piles | Pile tests | Decks | Earthquakes | Seismic loads | Load tests | Seismic tests | Jacking

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