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• W155352261 abstract "This study reports on the insitu investigation, site stratigraphy, field monitoring, data reduction and subsequent time domain analysis of soil-structure interaction at St. George Island Causeway Pier 1S and 3S subject to barge impacts. The insitu investigation involved Standard Penetration Testing, Electric Cone Penetration Testing, Dilatometer Testing and Pressuremeter Testing. The insitu testing was used to identify soil stratigraphy, engineering properties (i.e., strength, & moduli), as well as axial T-z and lateral P-y nonlinear soil-pile spring behavior. The field instrumentation included soil total stress and pore pressure gages in front and behind the embedded pile cap as well as a fully instrumented (strain gages along length) pile attached to the lead row of the Pier 1S group (5 x 8 layout). The pier was struck multiple times with a Jumbo barge at different velocities resulting in varying peak loads (100 supra kips, 800 supra kips, 900 supra kips). The resulting pile cap displacements, soil pressures, and pile moment & shears, as well as dynamic soil-pile resistance was obtained for each impact. The field impact data suggests that significant inertia and damping resistance from the soil occurs besides static resistance for barge impact. The field tests were subsequently modeled with both LS-DYNA and FB-MultiPier in time domain analyses. The soil-pile damping resistance was characterized through viscous dampers as identified by Smith & El Naggar. In the case of Smith, the ultimate lateral soil resistance, Pu, was multiplied recommended Smith Damping, Js (0.1) for granular soil and the layer thickness. Group reduction factors, i.e., P-y multipliers were used for both the static as well as damping resistance. The predicted deflections, pile head shears, and soil resistance agreed reasonably with the field measurements. Analyses of Pier 1S & 3S revealed that at peak load, anywhere from sixty to seventy percent of the resistance may be attributed to damping and intertia. The latter suggests that time domain analysis may result in greater resistance (vs. current American Association of State Highway and Transportation Officials (AASHTO)) as well as more accurate analysis of bridge response to vessel impacts. However, further laboratory and field-testing are warranted for soil damping characterization." @default.
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• W155352261 date "2005-09-01" @default.
• W155352261 modified "2023-09-26" @default.
• W155352261 title "Barge Impact Testing of St. George Causeway Bridge Geotechnical Investigation" @default.
• W155352261 hasPublicationYear "2005" @default.
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