Bridge Column Footing Performance and Seismic Retrofit Evaluation Considering Soil-Structure Interaction
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2024-06-01
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Edition:Final Report
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Abstract:This project investigated a new seismic retrofitting technique for bridge column-footing substructure components considering the influence of soil-structure interactions (SSI). The seismic retrofitting technique uses titanium alloy bars to provide both confinement of the concrete column and a supplemental flexural tension load path. Laboratory and field tests of full-scale models of existing bridge column-footing assemblies were conducted. SSI were included in the laboratory tests using extruded polystyrene foam insulation to approximate the bearing strength and stiffness of some soils. SSI prevented failure of the retrofitted columns due to rocking of the foundation. Analytical studies were used to predict the overall response of the footing-column-soil systems for SSI including nonlinear finite difference models and nonlinear discrete spring models to allow parametric studies. Multi-column bents were modeled to predict system response which caused axial loads to vary in the columns during lateral loading. Field snap-back tests were conducted using a footing-column specimen in native Willamette Silt. Variations in response were observed with seasonal changes in soil conditions. The results demonstrate that interactions between column-footing-soil are significant to assessing the demands in the soil, footing, and column to optimally design the retrofit to achieve proper seismic performance of vintage reinforced concrete bridge substructures. A guideline for the analysis of rocking footings using the AASHTO-LRFD specifications was developed using sectional and strut-and-tie methods.
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