Development of LRFD design procedures for bridge piles in Iowa : field testing of steel H-piles in clay, sand, and mixed soils and data analysis (volume II).
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2011-09-01
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Alternative Title:Development of LRFD procedures for bridge pile foundations in Iowa;Development of LRFD procedures for bridge pile foundations in Iowa : volume II;Development of LRFD procedures for bridge pile foundations in Iowa volume II;Field testing of steel H-piles in clay, sand, and mixed soils and data analysis (volume II);Field testing of steel H-piles in clay, sand, and mixed soils and data analysis;
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Edition:Final report - volume II.
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Abstract:In response to the mandate on Load and Resistance Factor Design (LRFD) implementations by the Federal Highway Administration
(FHWA) on all new bridge projects initiated after October 1, 2007, the Iowa Highway Research Board (IHRB) sponsored these research
projects to develop regional LRFD recommendations.
The LRFD development was performed using the Iowa Department of Transportation (DOT) Pile Load Test database (PILOT). To
increase the data points for LRFD development, develop LRFD recommendations for dynamic methods, and validate the results of
LRFD calibration, 10 full-scale field tests on the most commonly used steel H-piles (e.g., HP 10 x 42) were conducted throughout Iowa.
Detailed in situ soil investigations were carried out, push-in pressure cells were installed, and laboratory soil tests were performed. Pile
responses during driving, at the end of driving (EOD), and at re-strikes were monitored using the Pile Driving Analyzer (PDA),
following with the CAse Pile Wave Analysis Program (CAPWAP) analysis. The hammer blow counts were recorded for Wave Equation
Analysis Program (WEAP) and dynamic formulas.
Static load tests (SLTs) were performed and the pile capacities were determined based on the Davisson’s criteria. The extensive
experimental research studies generated important data for analytical and computational investigations. The SLT measured loaddisplacements
were compared with the simulated results obtained using a model of the TZPILE program and using the modified
borehole shear test method. Two analytical pile setup quantification methods, in terms of soil properties, were developed and validated.
A new calibration procedure was developed to incorporate pile setup into LRFD.
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