Bending model for composite UHPFRC-RC elements including tension stiffening and crack width

Zanuy, Carlos; Ulzurrún, Gonzalo S.D.

doi:10.1016/j.engstruct.2019.109958

Cited by 11 publications

(17 citation statements)

References 11 publications

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“…In order to understand the response measured in the tests, it is necessary to compare them with a simple but consistent model. A simplified version of the composite tension chord model proposed by Zanuy and Ulzurrun [ 25 ] is presented here to characterize the different stages of RC-HPFRC elements in the serviceability range. Typically, the service range corresponds with a strain domain well before the yield limit of the steel ( f y / E s ).…”

Section: Discussionmentioning

confidence: 99%

“…Analogously, a tension chord model is necessary for RC-HPFRC elements in order to understand the mechanical contribution of the three materials involved (HPFRC, concrete and steel) and the stress transfer between them. Zanuy and Ulzurrun [ 25 ] have proposed a formulation for the tension chord of RC-HPFRC beams with tensile strengthening, but so far, no specific tests have been reported to understand the composite response of RC-HPFRC tension members. Recently, some authors tested reinforced HPFRC tension members, showing that the high tensile strength and strain-hardening capacity of HPFRC lead to improved stiffness, first cracking strength and reduced crack widths than comparative RC members with reinforcing ratios of 0.8–2.5% [ 26 , 27 , 28 ].…”

Section: Introductionmentioning

confidence: 99%

“…The present paper represents a step forward in the authors’ research towards a better understanding of the composite behavior of RC-HPFRC members. Previous research [ 6 , 25 ] has focused on the behavior of beam elements under bending or combined shear-bending forces. In Ref.…”

Section: Introductionmentioning

confidence: 99%

“…In Ref. [ 25 ], a necessity to obtain specific experimental evidence on composite tension members was put in evidence in order to complement tension chord models. Such necessity is addressed herein with a specific experimental campaign and a proposal of a simplified tension chord model for the service load domain.…”

Section: Introductionmentioning

confidence: 99%

“…Crack widths and deformations are analyzed to understand the improved serviceability and the potential durability of RC-HPFRC with respect to RC with the help of a novel simplified theoretical approach able to define the behavioral phases of RC-HPFRC tension members with 4 key points. A significant novelty of the model with respect to previous approaches [ 25 ] is the introduction of the relevant role played by time-dependent shrinkage, so that the experimental results can be consistently analyzed. The effect of shrinkage is a complex phenomenon as composite members are affected by two materials (concrete and HPFRC) shrinking from different times.…”

Section: Introductionmentioning

confidence: 99%

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Composite Behavior of RC-HPFRC Tension Members under Service Loads

2020

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A significant increase of the use of high-performance fiber-reinforced concrete (HPFRC) to strengthen reinforced concrete structures (RC) has been noted for the past few years, thereby achieving composite RC-HPFRC elements. Such a technique tries to take advantage of the superior material properties of HPFRC in the ultimate and service load regimes. Many of the existing works on RC-HPFRC elements have focused on the strength increase at the ultimate load state and much less effort has been devoted to the serviceability response. The in-service performance of RC structures is governed by the behavior of the tension chord, which determines the crack pattern (crack widths are critical for durability) and deformations. The presence of HPFRC is supposed to improve serviceability due to its strain-hardening and tension-softening capacities. In this paper, the experimental analysis of composite RC-HPFRC tension members is dealt with. Specimens consisting of a RC tie strengthened with two 35 mm thick HPFRC layers have been subjected to loads in the service range so that the deformational and cracking response can be analyzed. The HPFRC has been a cement-based mortar with 3% volumetric amount of short straight steel fibers with a compressive and tensile strength of 144 MPa and 8.5 MPa, respectively. The experiments have shown that RC-HPFRC has higher stiffness, first cracking strength and reduced crack widths and deformations compared to companion unstrengthened RC. To understand the observed behavioral stages, the experimental results are compared with an analytical tension chord model, which is a simplified version of a previous general model by the authors consisting of 4 key points. In addition, the influence of time-dependent shrinkage has been included in the presented approach.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Composite Behavior of RC-HPFRC Tension Members under Service Loads

2020

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Modeling the behavior of shear‐dominated walls retrofitted with ultra high‐performance fiber‐reinforced concrete jackets

Mihaylov

Franssen

2022

Structural Concrete

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Large-scale tests of shear-dominated walls with ultra high-performance fiberreinforced concrete (UHPFRC) jackets have shown the high effectiveness of this retrofitting solution. The jackets can suppress brittle shear failures and result in a ductile response governed by yielding of the flexural reinforcement.In addition, due to the low porosity of UHPFRC and the crack control provided by the fibers, the jackets can also provide an effective corrosion protection. However, while this retrofitting solution is very promising, there is a lack of mechanical models that can predict the effect of UHPFRC jackets. This paper proposes such a model based on a three-parameter kinematic theory (3PKT) for reinforced concrete walls. The 3PKT is extended by modeling three important effects associated with the UHPFRC jackets: tension in the fibers across the critical diagonal cracks, increased compression resistance of the critical loading zones, and enhanced crack control. The results show that the proposed approach can be used to design the properties of UHPFRC jackets in order to achieve a desired structural response in terms of strength, ductility, and crack control.

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Fiber content optimization of UHPC and R-UHPC oriented to tensile behavior and cost reduction

Luo

Zhang

2023

Construction and Building Materials

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Bending model for composite UHPFRC-RC elements including tension stiffening and crack width

Cited by 11 publications

References 11 publications

Composite Behavior of RC-HPFRC Tension Members under Service Loads

Composite Behavior of RC-HPFRC Tension Members under Service Loads

Modeling the behavior of shear‐dominated walls retrofitted with ultra high‐performance fiber‐reinforced concrete jackets

Fiber content optimization of UHPC and R-UHPC oriented to tensile behavior and cost reduction

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