United States Department of Transportation
i
Performance of Prestressed Bridge Girders Subjected to Vehicle Impacts
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2024-08-01
[PDF-2.68 MB]
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Edition:Final Report
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Abstract:This study presents a numerical modeling approach that effectively models the response of prestressed girder bridges under lateral impact loads using LS-DYNA, a finite element analysis (FEA) program. The proposed methodology was validated using experimental data from reinforced concrete beam impact tests, prestressed beam impact tests, and static testing of a full-scale bridge. Thirteen models were intensively validated using existing experimental data. These validated models were then utilized to conduct a comprehensive parametric study, examining various influential factors on the dynamic response of bridge prestressed concrete girders (BPCG) when subjected to vehicle collisions. Factors investigated included vehicle speed and mass, girder span, and girder type. Semi-trailer speed up to 144 km/h and girder spans range from 15.24 to 27.43 m were investigated. It was found that the shear failure mode was directly influenced by the girder stiffness. Also, the transformation from global shear to localized shear failure occurred when the girder span increased by a factor of 1.8. A proposed value of 1520 kN was proposed for the peak impact force resulting from the tractor semi-trailer. The findings indicate that the proposed modeling technique can be effectively used to investigate the structural response of prestressed girder bridges subjected to lateral impact loads.
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