Seismic performance of precast concrete columns with prefabricated UHPC jackets in plastic hinge zone

Guan, Dongzhi; Chen, Zixuan; Liu, Jiabin; Lin, Zhiyi; Zhang, Guo

doi:10.1016/j.engstruct.2021.112776

Cited by 45 publications

(5 citation statements)

References 25 publications

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“…Therefore, torsional effects should be considered when attempting to improve seismic performance. Concrete jacketing is one of the most typical seismic retrofitting methods suggested by the U.S. Federal Emergency Management Agency [ 4 ] and has been proven to enhance strength and stiffness [ 5 , 6 , 7 , 8 ]. To secure confinement and seismic performance under torsion, interface treatment, which can increase bonding stress and the arrangement of reinforcing steel bars, should be significantly considered.…”

Section: Introductionmentioning

confidence: 99%

An Experimental Study on Torsional Behavior of Reinforced Concrete Columns Retrofitted with Hybrid Concrete Jackets

Kim

Lee

2023

Materials

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The concrete jacketing method for retrofitting old reinforced concrete (RC) columns should secure confinement and seismic performance under torsion as well as unidirectional later loads. In a previous study, a hybrid concrete jacketing method was proposed using steel wire mesh (SWM), steel grid reinforcement (SGR), which can replace reinforcement of existing concrete jacketing method, and using steel fiber non-shrinkage mortar (SFNM). These details can simplify the retrofitting process of the existing concrete jacketing method, and seismic performance was evaluated by conducting a cyclic loading test under unidirectional loading. In this paper, the torsional behavior of RC columns retrofitted with the hybrid concrete jacketing method was investigated. Four specimens were fabricated and conducted cyclic loading tests under two types of loading schemes, unidirectional and bidirectional loading, to examine the effect of the loading path. The strength and energy dissipation capacity of retrofitted columns with hybrid concrete jackets increased approximately eight times compared to the old RC columns under torsional loading. Therefore, the hybrid concrete jacketing method can improve torsional resistance.

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Section: Introductionmentioning

confidence: 99%

An Experimental Study on Torsional Behavior of Reinforced Concrete Columns Retrofitted with Hybrid Concrete Jackets

Kim

Lee

2023

Materials

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“…Two of them were externally strengthened with UHPC, and their static behaviors were compared and analyzed to evaluate crack development, failure mechanisms, ductility, and strength degradation. Additionally, Guan et al [11] proposed a strengthening approach for the plastic hinge region of precast columns using prefabricated UHPC jackets based on an experimental campaign on three columns. They found that the height of the prefabricated UHPC jacket is a critical factor in influencing the plastic hinge zone by shifting the damaged areas away from the footing connection, while the thickness of the UHPC jacket has limited influence.…”

Section: Introductionmentioning

confidence: 99%

Fragility-based effectiveness evaluation of reinforced concrete bridge piers strengthened with UHPC jackets

Nguyen,

Phan

et al. 2023

IOP Conf. Ser.: Mater. Sci. Eng.

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The use of ultra-high-performance concrete (UHPC) jackets as a seismic strengthening method for reinforced concrete structures has become increasingly prevalent. Specifically, these jackets are applied to plastic hinge regions of the structures to improve overall earthquake resistance. This study evaluates the effectiveness of UHPC jackets in strengthening reinforced concrete columns through fragility curves. The columns are modeled numerically, accounting for material nonlinearity, and various strengthening scenarios, including those without UHPC jackets and with UHPC jackets of different heights, are modeled and validated with cyclic loading tests. Subsequently, a case study of a two-column reinforced concrete bridge pier is examined. Time-history dynamics analyses are conducted on 140 ground motion records to develop probabilistic seismic demand models of the column with different strengthening designs. Fragility curves obtained using the cloud method indicate a significant impact of the strengthening method on the failure probability of the column. The research findings presented in this paper provide engineers with a basis for selecting appropriate UHPC jacket parameters, including thickness, height, and material strength in a rational manner.

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“…In precast concrete structures, the connections between different prefabricated elements are the inherent positions where the stiffness of components changes. Under earthquake attacks, the seismic loading-induced damage in precast concrete structures is prone to concentrate at the connection zones locally [4][5][6][7], leading to relatively smaller damaged areas than those in monolithic structures [8,9]. The energy dissipation capacity of emulative precast structures, relying on the crushing of concrete and the yielding of reinforcements, is generally slightly inferior to that of monolithic concrete structures with the same basic configurations and reinforcements.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study of Emulative Precast Concrete Beam-to-Column Connections Locally Reinforced by U-Shaped UHPC Shells

et al. 2022

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Precast beam–column connections act as vital elements of precast concrete frames. To enhance the resistance to the earthquake-induced damage and environment-induced deterioration of precast beam–column connections, an innovative precast concrete beam-to-column connection locally enhanced by prefabricated ultra-high-performance concrete (UHPC) shells was proposed. For studying the seismic behaviors of these novel connections and the influence caused by the prefabricated UHPC shell length, full-scale precast specimens were experimentally investigated using low-cyclic reversed loading tests. The obtained results were analyzed and discussed, including hysteresis curves, skeleton curves, strength and deformability, performance degradation, energy dissipation capacities, and plastic hinge length. The results reveal that the novel precast concrete beam–column connections with UHPC shells behaved satisfactorily under seismic loadings. The damage in the concrete near the lower part of the beam end is reduced by the prefabricated UHPC shells. The longer prefabricated UHPC shells were more useful for decreasing the damage to the precast concrete components and improved the structural performance. The precast specimen with 600-mm long UHPC shells can achieve a ductility of 4.87 and 4.0% higher strength than the monolithic reference specimen.

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Seismic performance of precast concrete columns with prefabricated UHPC jackets in plastic hinge zone

Cited by 45 publications

References 25 publications

An Experimental Study on Torsional Behavior of Reinforced Concrete Columns Retrofitted with Hybrid Concrete Jackets

An Experimental Study on Torsional Behavior of Reinforced Concrete Columns Retrofitted with Hybrid Concrete Jackets

Fragility-based effectiveness evaluation of reinforced concrete bridge piers strengthened with UHPC jackets

Experimental Study of Emulative Precast Concrete Beam-to-Column Connections Locally Reinforced by U-Shaped UHPC Shells

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