The goal of the project is to evaluate the quality of available load test data from drilled shafts, and integrate the suitable test information into an electronic database in order to develop knowledge and advance LRFD procedures for Drilled Shaft.
To achieve the overall goal, the project included the following objectives:
1. Formulate a quality-assured electronic database (DSHAFT) with information comprising of Osterberg, Statnamic, and Cross-hole Sonic Logging data for drilled shafts
2. Establish a less ambiguous approach to categorize soil profiles as clay, sand or mixed soils as well as taking into account the effects of rock-socketing
3. Identify the need for further tests in suitable soil profiles
4. Develop and validate LRFD resistance factors for drilled shafts using the data available in DSHAFT.
Iowa DOT; LRFD; drilled shafts; bridge foundation; resistance factors; clay; sand; mixed soils; rock-socket.