Fatigue resistance of reinforced UHPFRC beams

Sawicki, Bartłomiej; Brühwiler, Eugen

doi:10.1016/j.ijfatigue.2021.106216

Cited by 13 publications

(4 citation statements)

References 20 publications

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“…These new features could trigger UHPFRC applications in more fields such as tunnels, retaining walls and buildings (lightweight slabs). New studies on the fatigue behavior (Sawicki and Brühwiler, 2021) and hydro-abrasion (Wassmann and Brühwiler, 2016) could enable new applications in highlysolicitated road surfaces and blocks, sleepers and fixed slabs in railways structures to reduce maintenance.…”

Section: Future Research Prospectsmentioning

confidence: 99%

A Review of the Use of UHPFRC in Bridge Rehabilitation and New Construction in Switzerland

Bertola

Schiltz

Denarié

et al. 2021

Front. Built Environ.

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Ultra-High-Performance Fibre Reinforced Cementitious Composite (UHPFRC) provides solutions to enhance existing structures and design innovative new structures. Structural UHPFRC offers 3–5 times higher compressive and tensile strengths than ordinary concrete. Due to its strain-hardening behavior and dense matrix, structures made of UHPFRC remain crack-free and waterproof, guaranteeing durability. UHPFRC has been used particularly in Switzerland with more than 280 applications since 2003. A review of UHPFRC applications in the country is proposed in this paper. Ten bridge case studies are presented, including five strengthening of existing structures and five new designs. These structures were chosen to assess the multiple benefits that UHPFRC provides compared to traditional reinforced-concrete structures. Besides structural efficiency, several construction criteria are considered, such as construction costs, material durability, environmental impacts, and construction time. Structural rehabilitation made with UHPFRC leads to cost-effective interventions, and this material also helps to preserve heritage structures. Due to its specific mechanical properties, UHPFRC enables new structures with distinctive aesthetic designs with reduced construction time. The crucial contribution of research to the first case studies is also highlighted. This link between Swiss universities and the construction industry has quickly transitioned UHPFRC Technology from academic studies to real-world applications. Nowadays, the UHPFRC Technology is maturing and applications are common in the country.

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Section: Future Research Prospectsmentioning

confidence: 99%

A Review of the Use of UHPFRC in Bridge Rehabilitation and New Construction in Switzerland

Bertola

Schiltz

Denarié

et al. 2021

Front. Built Environ.

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“…Comprehensive studies of the fatigue performance of NC beams were developed by researchers [35,36], and that of UHPC beams was studied as well [37,38]. For actual structures, UHPC members in service are subjected to the greater stress ranges attributed to its superior mechanical properties; as a consequence, UHPC members tend to be more sensitive to fatigue load levels in service life compared with NC members [39].…”

Section: Introductionmentioning

confidence: 99%

Experimental Research on Fatigue Behavior of Reinforced UHPC-NC Composite Beams under Cyclic Loading

Wang,

Ji,

et al. 2024

Materials

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Ultra-high-performance concrete (UHPC), a new cement-based material that offers high mechanical strength and good durability, has been widely applied in construction and rehabilitation projects in recent years. An optimum bending system is achieved by positioning the UHPC layer at the bottom tensile zone of the composite beam and placing the normal-strength concrete (NC) layer at the upper compression zone, which is described as the UHPC-NC composite beam. The fatigue behavior of reinforced UHPC-NC composite beams was described in this study, with an emphasis on the effects of UHPC layer thickness and fatigue load level on the fatigue life of the beam, deformation of the interface between UHPC and NC layers, as well as the bending stiffness of the beam. A total of 9 reinforced UHPC-NC composite beams were tested under cyclic loading. The test variables include UHPC layer thicknesses (zero, 200, and 360 mm), reinforcement ratios (1.184% and 1.786%), and the upper load levels (0.39~0.65). The results showed that good bonding had been achieved without delamination between UHPC and NC layers prior to the final fatigue failure of the beam, and the bending stiffness of the composite beam experienced a three-stage reduction under cyclic loading. Furthermore, an equation was proposed to predict the stiffness reduction coefficient of UHPC-NC composite beams under cyclic loading.

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“…[40][41][42][43][44][45] At the member level there is limited design guidance to deal with reinforced UHPFRC under high cycle fatigue and limited number of experimental test of reinforced UHPFRC reported. For example, Sawicki and Brühwiler 46 show the results of three different T cross-section full scale beams under high cycle fatigue with the longest experimental campaign, in which one specimen was subjected to almost 27 million cycles. Although this work at the member level is important to understand the overall member behavior under fatigue, it is difficult to isolate the impacts of fatigue on the tension stiffening mechanism from a flexural test and this understanding is required to develop new design guidelines.…”

Section: Introductionmentioning

confidence: 99%

Experimental and theoretical analysis of cracking and tension stiffening in UHPFRC under high‐cycle fatigue

Sepulveda

Visintin

Sturm

et al. 2023

Structural Concrete

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Tension‐stiffening controls the serviceability behavior of concrete structures as it is responsible for crack formation and, consequently, the deflection of beams. In fiber reinforced concrete, such as ultra‐high performance fiber reinforced concrete (UHPFRC), fibers bridge cracks and thereby transfer tensile stresses across the cracked region, allowing for tensile stresses to be carried by the concrete within the cracked region. Due to structures being designed for longer design lives, the consideration of long‐term effects such as fatigue is required. Much research has examined tension‐stiffening under fatigue when subjected to low cyclic loading, but very little has considered the effects of high‐cycle fatigue, especially for UHPFRC. This paper presents the results of nine UHPFRC tension‐stiffening tests under high‐cycle fatigue in which the crack formation and development under varying cyclic ranges were studied. Specimens were subjected to as many as 5.7 million cycles, and crack readings were taken during each test. The experimental results demonstrate the random nature of cracking on UHPFRC as well as the increase in the crack width under cyclic loads. Finally, this research described the extension of an existing partial‐interaction mechanics model to allow for the stress in the fibers and the increase in crack width due to high cycle fatigue.

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Fatigue resistance of reinforced UHPFRC beams

Cited by 13 publications

References 20 publications

A Review of the Use of UHPFRC in Bridge Rehabilitation and New Construction in Switzerland

A Review of the Use of UHPFRC in Bridge Rehabilitation and New Construction in Switzerland

Experimental Research on Fatigue Behavior of Reinforced UHPC-NC Composite Beams under Cyclic Loading

Experimental and theoretical analysis of cracking and tension stiffening in UHPFRC under high‐cycle fatigue

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