Damage models for UHPFRC and R-UHPFRC tensile fatigue behaviour

Makita, Tohru; Brühwiler, Eugen

doi:10.1016/j.engstruct.2015.01.049

Cited by 21 publications

(4 citation statements)

References 6 publications

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“…The fatigue behaviour of UHPC is ambiguous and the fatigue test data are scatter [16]. According to test results of Makita and Brühwiler [17], cracks of UHPC will stop at about 500,000 cycles when the elastic modulus has reduced by 30%. Yu et al [18] conducted the fatigue test of the reactive powder concrete, which indicated a decrease of 50% in the original value of the elastic modulus before reaching to the fatigue damage.…”

Section: Fatigue Life Assessmentmentioning

confidence: 99%

Fatigue Life Assessment of Orthotropic Steel Deck with UHPC Pavement

Jiang

Yuan

et al. 2017

Journal of Engineering

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In recent years, a number of large-span bridges with orthotropic steel decks were constructed in China. With increasing traffic volumes and higher wheel loads, many fatigue cracks developed at the welds and the edge of cut-out holes. This paper aims at presenting the numerical analysis on the fatigue performance of the orthotropic steel deck using ultrahigh performance concrete (UHPC) overlay as the deck pavement instead of the conventional asphalt concrete pavement. By using finite element method (FEM) model, stress distribution at fatigue sensitive locations under the action of wheel loads is characterized and the obtained stress ranges indicate that the UHPC pavement significantly reduces the magnitude of the stress peak valued. A suggested truck stream model based on the weigh-in-motion (WIM) data of four bridges in China is employed to calculate the stress variation at specific fatigue details. Furthermore, the fatigue damage accumulation at fatigue details under the UHPC and conventional asphalt concrete pavement is studied based on Miner’s linear cumulative damage rule and the rain-flow method. The results indicate that the UHPC pavement on the orthotropic steel deck can extend the service lives of the concerned regions over 100 years, but the fatigue lives will reduce significantly when the elastic modulus of UHPC decreases to 50% of the original value.

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Section: Fatigue Life Assessmentmentioning

confidence: 99%

Fatigue Life Assessment of Orthotropic Steel Deck with UHPC Pavement

Jiang

Yuan

et al. 2017

Journal of Engineering

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“…Such improved mechanical properties compared to normal strength concrete (NSC), strongly favour its utilization as thin overlay for rehabilitating or strengthening purposes, which is a growing field of application (Brühwiler, 2019; Brühwiler and Denarié, 2013; Guingot et al, 2013; Denarié et al, 2013). Through this concept, many experimental campaigns were realized to study the bending behaviour of hybrid NSC-UHPC elements (Habel, 2004; Makita, 2014; Oesterlee, 2010; Wuest, 2007; Al-Osta et al, 2017; Denarié et al, 2003; Lachance et al, 2016; Noshiravani and Brühwiler, 2013; Paschalis et al, 2018; Prem and Murthy, 2016; Safdar et al, 2016; Zingaila et al, 2017; Pharand, 2022; Yin et al, 2017). However, only a few (Pharand and Charron, 2022a; Sine et al, 2022; Noshiravani and Brühwiler, 2013; Ji and Liu, 2020; Yin et al, 2017) specifically studied the shear behaviour of hybrid NSC-UHPC elements.…”

Section: Introductionmentioning

confidence: 99%

Shear resistance and structural hardening resistance models for hybrid NSC-UHPC elements

Pharand

Charron

2023

Advances in Structural Engineering

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Ultra-high performance concrete (UHPC) is being increasingly used as a thin overlay for deficient normal strength concrete (NSC) structural elements. Compared to reinforced NSC elements, hybrid NSC-UHPC elements have two stages' structural behaviour under high shear load before failure: monolithic action followed by a composite mechanical action. The composite mechanical action gives to hybrid elements a structural hardening capability after the occurrence of a diagonal shear crack and is not yet considered by most design standards. Two analytical models for hybrid elements under shear load are thus proposed to predict the shear resistance V R of the monolithic action and to predict the structural hardening resistance V Rsh of the composite mechanical action. The shear resistance model integrates the UHPC contribution in the estimation of the tensile strain at mid-height cross-section according to the general method of the Canadian code. The structural hardening behaviour is reproduced with a strut-and-tie system with plastic hinges, where the failure is controlled by the crushing of a concrete strut. Predictions of the proposed models are in very good agreement with 31 hybrid elements experimental results retrieved from the literature.

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“…In recent years, UHPFRC has been widely used for bridge reinforcement and in deck pavements, but the research on using the UHPFRC material for the whole bridge, as well as the addition of prestressed reinforcement, has still been less [29][30][31]. However, to explore the structural performances of UHPFRC bridges, better understanding and prediction of material properties are necessary [32][33][34]. erefore, in this paper, the failure test of a full-scale prestressed UHPFRC U-shaped beam is conducted, and a nonlinear numerical model is established.…”

Section: Introductionmentioning

confidence: 99%

Study on Mechanical Performance of Prestressed UHPFRC U‐Beam Bridges

Liu

Brühwiler

Cui

et al. 2021

Advances in Civil Engineering

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The forms of U-shaped UHPFRC beams have not been investigated for the highway footbridge. Compared with the traditional section forms, the U-shaped UHPFRC beams can reduce the material consumption under the condition of providing the same bearing capacity. Furthermore, prestressed U-shaped UHPFRC beams are rarely reported in the existing research. This paper explores the flexural behavior of prestressed ultrahigh-performance fiber-reinforced concrete (UHPFRC) beam bridge having unique design and the material properties of prestressed reinforcement combined with UHPFRC. Based on the unique shape of the U beam, the flexural performance test of the full-scale model of the prestressed UHPFRC U beam is conducted. Then, the finite element model considering material nonlinearity and structural ductility is established using Midas FEA software. Finally, the failure mode, failure process, cracking moment, ultimate moment, and strain of the full-scale model are studied. The calculation formulas of the flexural capacity of UHPFRC U beam considering ductile failure are derived. The comparative analysis results show that the prestressed UHPFRC U beam has an excellent flexural performance. The bending failure of a U-shaped beam belongs to the group of ductile failures, which is characterized by the main crack along the central rib and the loading center, which is accompanied by multiple microcracks. The failure process can be divided into four stages: linear deformation, microcracks development, main cracks development, and bearing capacity decline. The incorporation of steel fiber and the interaction between UHPFRC and reinforcement can effectively reduce the development of cracks. The U-beam bending moment is 50–55% of the ultimate bending moment. In the UHPFRC bridge design, the deformation can be used as a control index, and material advantages of the UHPFRC can be used to a certain extent. The strain-hardening characteristics of the UHPFRC are obvious in the loading process. The finite element analysis results show that the maximum strain value appears at the central rib, followed by the transverse strain value of the bottom plate, while the minimum strain is the longitudinal strain value of the bottom plate. The deformation of the rib plate is the largest, and the strain of the other measuring points changes slowly. The farther away from the center the measurement point is, the slower its strain changes. Therefore, the load is mainly caused by the central rib and the loading center plate. With the increase in the deformation, the load on both sides continuously moves to the central rib along the plate surface. This study can provide a useful reference for theoretical analysis and design of prestressed U-UHPFRC bridges.

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Damage models for UHPFRC and R-UHPFRC tensile fatigue behaviour

Cited by 21 publications

References 6 publications

Fatigue Life Assessment of Orthotropic Steel Deck with UHPC Pavement

Fatigue Life Assessment of Orthotropic Steel Deck with UHPC Pavement

Shear resistance and structural hardening resistance models for hybrid NSC-UHPC elements

Study on Mechanical Performance of Prestressed UHPFRC U‐Beam Bridges

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