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Experimental investigation and seismic vulnerability assessment of low flexural strength rectangular bridge piers retrofitted with ultrahigh-performance concrete jackets
Highlights Cyclic loading test of the bridge pier with mono-wide-UHPC and multi-narrow-UHPC jackets was performed. Positive retrofitting effects were witnessed and the strengthening mechanisms are discussed. 3D FE model is proposed, integrating CDP model, nonlinear reinforcement steel model, and bond-slip behavior. Seismic vulnerability assessment of the retrofitted RC piers is performed.
Abstract Effectiveness of an innovative retrofitting technique using ultrahigh-performance concrete (UHPC) jackets was investigated, for “as-built” bridge piers with low flexural strength. Cyclic loading test was performed on the pier specimens, two of which were retrofitted with a mono-wide-strip UHPC (W-UHPC) jacket, and the other two were with a multi-narrow-strip UHPC (N-UHPC) jacket. Their seismic responses were compared, regarding damage evolution, hysteretic behavior, skeleton curve, ductility and energy dissipation. The piers with the W-UHPC jacket exhibited a higher lateral strength, but were prone to plastic hinge relocation. Comparatively, N-UHPC jacket improved the piers’ ductility and smeared concrete damage. Nevertheless, guaranteeing the tight contact between the N-UHPC jacket and the shaft was crucial. Both W- and N- UHPC jackets mitigated residual drift and concrete damage, and thereby enhancing the piers’ seismic resilience. Four enhancing mechanisms from the UHPC jackets are discussed, namely passive confinement effect, cross-section enlargement effect, gap-opening effect, and interface-opening effect. Alongside, 3D solid and 1D fiber-based finite element (FE) models are constructed to represent the piers’ nonlinear static push-over (SPO) and cyclic responses, respectively. Finally, seismic vulnerability of the retrofitted piers was evaluated by generating structure-specific fragility curves.
Experimental investigation and seismic vulnerability assessment of low flexural strength rectangular bridge piers retrofitted with ultrahigh-performance concrete jackets
Highlights Cyclic loading test of the bridge pier with mono-wide-UHPC and multi-narrow-UHPC jackets was performed. Positive retrofitting effects were witnessed and the strengthening mechanisms are discussed. 3D FE model is proposed, integrating CDP model, nonlinear reinforcement steel model, and bond-slip behavior. Seismic vulnerability assessment of the retrofitted RC piers is performed.
Abstract Effectiveness of an innovative retrofitting technique using ultrahigh-performance concrete (UHPC) jackets was investigated, for “as-built” bridge piers with low flexural strength. Cyclic loading test was performed on the pier specimens, two of which were retrofitted with a mono-wide-strip UHPC (W-UHPC) jacket, and the other two were with a multi-narrow-strip UHPC (N-UHPC) jacket. Their seismic responses were compared, regarding damage evolution, hysteretic behavior, skeleton curve, ductility and energy dissipation. The piers with the W-UHPC jacket exhibited a higher lateral strength, but were prone to plastic hinge relocation. Comparatively, N-UHPC jacket improved the piers’ ductility and smeared concrete damage. Nevertheless, guaranteeing the tight contact between the N-UHPC jacket and the shaft was crucial. Both W- and N- UHPC jackets mitigated residual drift and concrete damage, and thereby enhancing the piers’ seismic resilience. Four enhancing mechanisms from the UHPC jackets are discussed, namely passive confinement effect, cross-section enlargement effect, gap-opening effect, and interface-opening effect. Alongside, 3D solid and 1D fiber-based finite element (FE) models are constructed to represent the piers’ nonlinear static push-over (SPO) and cyclic responses, respectively. Finally, seismic vulnerability of the retrofitted piers was evaluated by generating structure-specific fragility curves.
Experimental investigation and seismic vulnerability assessment of low flexural strength rectangular bridge piers retrofitted with ultrahigh-performance concrete jackets
Tong, Teng (author) / Lei, Haipeng (author) / Yuan, Siqi (author) / Liu, Zhao (author)
Engineering Structures ; 206
2019-12-22
Article (Journal)
Electronic Resource
English
UHPC , Jacket , Seismic , Push-over , Vulnerability
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