Retrofitting of Bridge Columns Using UHPC

Farzad, Mahsa; Shafieifar, Mohamadreza; Azizinamini, Atorod

doi:10.1061/(asce)be.1943-5592.0001497

Cited by 68 publications

(17 citation statements)

References 34 publications

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“…UHPC is an advanced cementitious material with superior properties when compared to conventional concrete (15), such as higher compressive strength (more than 21,700 pounds per square inch [psi]), remarkable tensile strength, and high resistance against ion and chloride penetration. It had been used in accelerated bridge construction successfully (16)(17)(18)(19)(20)(21)(22). Because of its high flowability and enhanced durability, it is feasible that UHPC could be a good alternative to repair timber piles, retrofit timber piles, or both.…”

Section: Proposed Repair Techniquementioning

confidence: 99%

Repair of Timber Piles Using Ultra-High-Performance Concrete: Investigation of Load Transfer and Load-Carrying Capacity

Cárdenas

Mantawy

Azizinamini

2022

Transportation Research Record: Journal of the Transportation R

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Timber piles have been used for a long time in bridges and marine structures. Many of these structures have exceeded their service life and require maintenance or repair because of deterioration. To address this issue, repair/retrofit techniques utilizing ultra-high-performance concrete (UHPC) can provide many advantages, such as minimizing repair material amounts and high durability because of its superior mechanical characteristics. This paper presents preliminary tests to comprehend the behavior of composite specimens made of timber and UHPC, including the load transfer mechanism and load-carrying capacity. For load transfer between the timber pile and UHPC, push-off and slant shear tests were conducted on composite timber and UHPC specimens with different surface preparations for timber surfaces. It was concluded that because of the smoothness of the UHPC surface, mechanical connectors (nails) provided the highest interface shear strength between timber and UHPC. For the load-carrying capacity, several specimens were tested under compression loading and it was concluded that timber treatment before casting UHPC plays a vital role in restoring the load-carrying capacity of timber piles.

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Section: Proposed Repair Techniquementioning

confidence: 99%

Repair of Timber Piles Using Ultra-High-Performance Concrete: Investigation of Load Transfer and Load-Carrying Capacity

Cárdenas

Mantawy

Azizinamini

2022

Transportation Research Record: Journal of the Transportation R

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Section: Introductionmentioning

confidence: 99%

“…A method has been proposed for repairing reinforced concrete elements using ultra high-performance concrete (UHPC) to enhance the mechanical strength of the structure [3][4][5]. This method replaces the damaged surface concrete with a UHPC shell encapsulation [3][4][5]. The experimental investigation of the retrofitted columns with UHPC showed that this repair method is rather efficient regarding lateral strength, deformation, energy dissipation capacity, and stiffness degradation [3][4][5].…”

Section: Introductionmentioning

confidence: 99%

“…This method replaces the damaged surface concrete with a UHPC shell encapsulation [3][4][5]. The experimental investigation of the retrofitted columns with UHPC showed that this repair method is rather efficient regarding lateral strength, deformation, energy dissipation capacity, and stiffness degradation [3][4][5]. Furthermore, the results indicated that depending on the UHPC shell thickness and due to its much higher strength compared to substrate material, the capacity of the repaired section could significantly increase and become stronger than the original designed section.…”

Section: Introductionmentioning

confidence: 99%

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Simplified Method to Estimate the Moment Capacity of Circular Columns Repaired with UHPC

Farzad¹,

Rastkar²,

Sadeghnejad³

et al. 2019

Infrastructures

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Ultra high-performance concrete (UHPC) application, to enhance the mechanical strength of axially loaded reinforced concrete bridge substructure elements, was proposed and investigated in an earlier study. The results recommended that depending on the UHPC shell thickness, this method may cause shifting of the critical section to undesired locations, due to over-strengthening of the repaired section, and this should be a design consideration. This paper proposes a new simplified analytical approach to calculate the bending moment capacity of the repaired circular section. This method relies on hand calculations and only requires basic material properties (compressive and tensile strengths). The results from the simplified approach are validated with a well-established numerical sectional analysis method. The proposed approach may be considered simple and more straightforward for professional engineers.

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“…The new prefabricated substructure system was tested under cyclic loading and the specimen showed no residual drift or damage except for external dissipators. For repairing bridge columns, Farzad et al (2019), in their paper entitled "Retrofitting of bridge columns using UHPC," propose an innovative technique to repair damaged bridge columns by the use of thin layers of UHPC, which are applied to column concrete substrates. The authors tested 11 repaired bridge columns with different degrees of damage under combined constant axial load and incremental lateral loads.…”

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confidence: 99%