Seismic behavior of deficient reinforced concrete bridge piers confined with FRP – A fractional factorial analysis

Parghi, Anant; Alam, M. Shahria

doi:10.1016/j.engstruct.2016.08.011

Cited by 27 publications

(14 citation statements)

References 23 publications

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“…It has been found by the maintenance engineers that the strengthening of substructures is more difficult than that of superstructures because the substructures of a bridge include structures that lie under water most of the year, e.g., piles, piers, etc. Conventional strengthening methods for the substructure, such as enlarging section method [2], bonded steel plates method [3], fiber-reinforced polymer (FRP) method [4,5,6], extraneous prestressed strengthening technique [7], and other novel methods [8,9], do improve the load capacity and durability of substructure. However, they are more often than not expensive, time-consuming, and traffic-disrupting, because cofferdam needs to be built for drainage first before any work could be done to underwater substructures.…”

Section: Introductionmentioning

confidence: 99%

The Mix Ratio Study of Self-Stressed Anti-Washout Underwater Concrete Used in Nondrainage Strengthening

Jiang

Shen

et al. 2019

Materials

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Anti-washout underwater concrete (AWC) is widely used in nondrainage strengthening; however, there still exist some problems with it, such as high strength loss and poor interfacial bond in practical engineering application. Based on the study of self-stressed concrete (SSC), a research on the mix ratio for the C30 self-stressed anti-washout underwater concrete (SSAWC) was carried out in this paper in hope of solving the above problems, specifically, by adding an expansive agent to the AWC. The parameters, such as strength, fluidity, anti-dispersity, and expansibility, were picked as target indices in determination of the mix ratio. The orthogonal test design and range analysis were used to determine the reasonable mix ratio and study the influence of various parameters on the performance of SSAWC. The experimental program conducted includes a series of strength, fluidity, anti-dispersity, and expansibility tests on 18 groups of specimens. The results show that C30 SSAWC has an excellent performance using the optimal mix ratio. Compared with AWC, the expansibility and self-stress of the SSAWC can be easily observed, and the compressive strength ratio of the SSAWC casted in water to that casted in air is much bigger. This implies that SSAWC is applicable to the nondrainage strengthening.

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Section: Introductionmentioning

confidence: 99%

The Mix Ratio Study of Self-Stressed Anti-Washout Underwater Concrete Used in Nondrainage Strengthening

Jiang

Shen

et al. 2019

Materials

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“…Effective height ( H ) of the tested piers was (1.175 × 2 + 0.3) = 2.65 m and their height-to-diameter ( H/D ) ratio was 2.65/0.6 = 4.42 > 3. As a consequence, flexural-dominated failure mode was expected for the tested piers (Colomb et al, 2008; Parghi and Alam, 2016).…”

Section: Experimental Programmentioning

confidence: 92%

Experimental and numerical investigations on cyclic behaviors of precast segmental bridge piers with the hybrid of high-strength bars and unbonded prestressing tendons

Tong

Yuan

Zhuo

et al. 2020

Advances in Structural Engineering

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Precast segmental piers are gaining increasing attentions in low-medium seismic-risked regions. In this paper, cyclic behaviors of two precast segment piers reinforced with the hybrid of high-strength energy dissipation (“H” ED, ≥500 MPa) bars and unbonded tendons were experimentally investigated, accompanied with another two piers reinforced with merely “H” ED bars for the comparative study. It was observed that unbonded tendons benefitted the segmental piers in rising the lateral strength and mitigating the residual drift. On the other aspect, the tendons also made concrete prone to damage. Alongside, the finite element (FE) model is constructed for the four tested segmental piers, discritized with the displacement-controlled beam-colum element with a fiber section. With the bond-slip behavior of the “H” ED bars being incorporated, the numerical model accurately reflects the piers’ seismic behaviors.

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“…However, structures located underwater are more difficult to strengthen than superstructures. The existing strengthening methods [ 1 , 2 , 3 , 4 , 5 , 6 ] for substructures are costly, traffic-disrupting, and have a long construction time. To deal with these weak points of conventional strengthening methods, the FRP underwater strengthening method [ 7 ], the jacket strengthening method [ 8 ], and the precast concrete segment assembly method [ 9 ] have been proposed.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of the Hydration Characteristics and Anti-Washout Resistance of Non-Dispersible Underwater Concrete with Nano-SiO2 and MgO

et al. 2021

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In this paper, the effect of nano-SiO2 (NS) and MgO on the hydration characteristics and anti-washout resistance of non-dispersible underwater concrete (UWC) was evaluated. A slump flow test, a viscosity test, and setting time measurement were conducted to identify the impacts of NS and MgO on the rheological properties of UWC. The pH and turbidity were measured to investigate the anti-washout performance of UWC mixes. To analyze the hydration characteristics and mechanical properties, hydration heat analysis, a compressive strength test, and thermogravimetric analyses were conducted. The experimental results showed that the fine particles of NS and MgO reduced slump flow, increased viscosity, and enhanced the anti-washout resistance of UWC. In addition, both NS and MgO shortened the initial and final setting times, and the replacement of MgO specimens slightly prolonged the setting time. NS accelerated the peak time and increased the peak temperature, and MgO delayed the hydration process and reduced the temperature due to the formation of brucite. The compressive results showed that NS improved the compressive strength of the UWC, and MgO slightly decreased the strength. The addition of NS also resulted in the formation of extra C–S–H, and the replacement of MgO caused the generation of a hydrotalcite phase.

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Seismic behavior of deficient reinforced concrete bridge piers confined with FRP – A fractional factorial analysis

Cited by 27 publications

References 23 publications

The Mix Ratio Study of Self-Stressed Anti-Washout Underwater Concrete Used in Nondrainage Strengthening

The Mix Ratio Study of Self-Stressed Anti-Washout Underwater Concrete Used in Nondrainage Strengthening

Experimental and numerical investigations on cyclic behaviors of precast segmental bridge piers with the hybrid of high-strength bars and unbonded prestressing tendons

Evaluation of the Hydration Characteristics and Anti-Washout Resistance of Non-Dispersible Underwater Concrete with Nano-SiO2 and MgO

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