United States Department of Transportation
i
Numerical Evaluation of Precast Columns With Grouted Splice Sleeve Connectors Under Sequential Impact and Seismic Loads
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2024-08-01
[PDF-8.12 MB]
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Edition:Final Report
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Abstract:With the development of accelerated bridge construction (ABC), the seismic performance of typical ABC column-footing connections has been evaluated in high earthquake-prone states like Utah, California, Nevada, and Idaho. But to date, the current literature has yet to fully examine the impact behavior of coupler/rebar connections and the component under vehicle impact using numerical and finite element analysis. There is also a lack of studies on the residual seismic capacity of post-impact columns with GSS connectors. This study involves two major steps. First, the finite element models are validated using experimental data, ensuring accurate representation of the coupler/rebar interface, energy transfer, and material strength degradation. Second, the validated finite element (FE) model undergoes vehicle impact tests to simulate real-world conditions. Following this, the residual seismic capacity of the half-scale column is assessed to understand the impact on structural integrity and seismic resilience of precast columns with GSS connectors. In the validation part, the FE models of test specimens with single couplers effectively capture deformation behaviors, stress distribution, and bond-slip mechanisms, ensuring efficient load transfer. They demonstrated accuracy by predicting peak impact events with minimal error margins (0.7% to 1.65%), confirming their capability to simulate dynamic behaviors. The models accurately predict crack development, failure modes, and non-visible damage within couplers. This approach validates the FE modeling method for further dynamic studies, contributing to more resilient precast concrete structures. Additionally, the FE models of half-scale columns with six couplers showed good agreement with experimental results, capturing initial elastic behavior and bond-slip law. Errors in displacement ductility capacity ranged from 3.7% to 9.8%, and errors in effective yield force ranged from 2.1% to 7.6%, demonstrating high accuracy. The models effectively captured cracking, crushing, and plastic hinge development, validating their use for further studies on seismic performance in precast concrete columns.
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