Buckled piling at Ⅰ-43 Leo Frigo memorial bridge

摘要

A foundation retrofit was completed for WisDOT to reopen the Ⅰ-43 Leo Frigo Memorial Bridge, after about 61 cm of abrupt settlement at Pier 22. A multi-faceted forensic investigation was completed to evaluate mechanisms that led to section loss and subsequent buckling of existing driven HP14×73 pile foundations. Post-tensioned footing extensions were used to tie existing footings to new concrete footing extensions supported on 152 cm diameter drilled shafts, which were lined with fiberglass electrical-isolation sleeves.