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Vehicular Impact Resistance of Bridge with Strengthened Pier
This chapter delves into a numerical analysis of the resilience of highway bridges supported by UHPC piers, designed specifically for seismic resistance, against heavy truck impacts. Firstly, six distinct bridge pier configurations were designed, factoring in two concrete variants, i.e., NSC and UHPC, and three seismic hazard ratings, ranging from earthquake intensities (EI) 7, 8, to 9, in accordance with Chinese seismic design guidelines. The corresponding refined FE models were then established and validated through simulations of drop hammer tests on reinforced NSC and UHPC members. Then, 54 collision scenarios were designed, referencing actual accidents, leveraging the well-validated FE models of a simply-supported double-pier curved highway bridge and a heavy truck. These scenarios were analyzed numerically using the LS-DYNA nonlinear FE analysis software. The study examined the effect of seismic fortification levels and concrete type on vehicular impact forces, the dynamic responses of the entire bridge structure, and the damage and failure patterns of the impacted pier and the bridge in its entirety. This analysis underscores the benefits of employing UHPC piers with seismic design considerations for enhancing bridge structures’ resistance to vehicular impacts. Notably, particular attention was directed towards the safety of NSC-EI7 and UHPC-EI7 piers, as well as the brittle shear failure mode observed in NSC-EI8 piers. To quantitatively compare the collision resistance of bridges supported by NSC and UHPC piers under identical seismic fortification intensities, a performance evaluation method for the entire bridge structure was introduced, grounded on the residual lateral displacement of the impacted pier. This work offers valuable insights for the practical application of UHPC in bridge piers and the practical assessment of the post-collision performance of bridge structures.
Vehicular Impact Resistance of Bridge with Strengthened Pier
This chapter delves into a numerical analysis of the resilience of highway bridges supported by UHPC piers, designed specifically for seismic resistance, against heavy truck impacts. Firstly, six distinct bridge pier configurations were designed, factoring in two concrete variants, i.e., NSC and UHPC, and three seismic hazard ratings, ranging from earthquake intensities (EI) 7, 8, to 9, in accordance with Chinese seismic design guidelines. The corresponding refined FE models were then established and validated through simulations of drop hammer tests on reinforced NSC and UHPC members. Then, 54 collision scenarios were designed, referencing actual accidents, leveraging the well-validated FE models of a simply-supported double-pier curved highway bridge and a heavy truck. These scenarios were analyzed numerically using the LS-DYNA nonlinear FE analysis software. The study examined the effect of seismic fortification levels and concrete type on vehicular impact forces, the dynamic responses of the entire bridge structure, and the damage and failure patterns of the impacted pier and the bridge in its entirety. This analysis underscores the benefits of employing UHPC piers with seismic design considerations for enhancing bridge structures’ resistance to vehicular impacts. Notably, particular attention was directed towards the safety of NSC-EI7 and UHPC-EI7 piers, as well as the brittle shear failure mode observed in NSC-EI8 piers. To quantitatively compare the collision resistance of bridges supported by NSC and UHPC piers under identical seismic fortification intensities, a performance evaluation method for the entire bridge structure was introduced, grounded on the residual lateral displacement of the impacted pier. This work offers valuable insights for the practical application of UHPC in bridge piers and the practical assessment of the post-collision performance of bridge structures.
Vehicular Impact Resistance of Bridge with Strengthened Pier
Springer Tracts in Civil Engineering
Wu, Hao (author) / Cheng, Yuehua (author) / Ma, Liangliang (author)
2024-08-20
67 pages
Article/Chapter (Book)
Electronic Resource
English