Abstract
In this paper, a novel full-scale glass fiber-reinforced polymer (GFRP) bar-reinforced ultra-high-performance concrete (UHPC)-encased concrete-filled double-skin steel tubular bridge column (referred to as a GFRP-UHPC-encased CFDST column) is proposed and investigated under lateral impact loading. Detailed three-dimensional nonlinear finite element models of twenty-three full-scale columns subjected to rigid vehicle impact are established and simulated, including twenty GFRP-UHPC-encased CFDST columns, one GFRP-normal strength concrete (NSC)-encased CFDST column, one GFRP bar reinforced UHPC (GFRP-UHPC) column, and one steel bar reinforced UHPC (steel-UHPC) column. The models incorporate the strain rate effects of GFRP, steel, and concrete materials, as well as the effects of concrete confinement provided by the steel tubes and stirrups. The accuracy of the numerical models is validated against test results. A full-range analysis of the dynamic response of the GFRP-UHPC-encased CFDST column, GFRP-NSC-encased CFDST column, GFRP-UHPC column, and steel-UHPC column is conducted and discussed in detail. Furthermore, the impact resistance contributions of each component of the columns are analyzed and explored. The impact resistance of the GFRP-UHPC-encased CFDST column surpasses that of the GFRP-NSC-encased CFDST column, the GFRP-UHPC column, and the steel-UHPC column, demonstrating promising cooperation between its components. Finally, parametric studies are conducted to examine the influence of impact velocity and key geometric parameters on the dynamic behavior of GFRP-UHPC-encased CFDST columns. The impact velocity, the ratio of the outer steel tube diameter to the total column diameter (do/D), the ratio of the inner steel tube diameter to the total column diameter (di/D), and the thickness of the outer steel tube significantly influence the lateral impact behavior of GFRP-UHPC-encased CFDST columns, while the effect of the inner steel tube thickness is negligible.
Published Version
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