Publication

Fatigue behavior of UHPFRC and its implementation for design

Eugen Brühwiler
2024

Abstract

The fatigue behavior of UHPFRC in the range of high number of fatigue cycles is relevant for fatigue-prone elements of structures like bridges. Experimental and analytical research, conducted over the last 15 years by the authors and their team, on the fatigue behavior of UHPFRC, R-UHPFRC and composite elements consisting of R-UHPFRC and reinforced concrete are summarized in view of implementation for fatigue design. The existence of a fatigue endurance limit was evident at stress levels due to maximum fatigue loading corresponding to 40 to 60 % of the ultimate resistance. Subseqeunetly, fatigue design provisions are deduced and proposed for the fatigue strengthening of reinforced concrete bridge deck slabs by means of a layer of R-UHPFRC as well as for the fatigue dimensioning of R-UHPFRC structural elements. The application of these fatigue design provisions is illustrated by means of two realized UHPFRC bridge projects.

Official source

https://infoscience.epfl.ch/entities/publication/35840c70-8ebf-40e5-afae-7dd261e4ee26

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Eugen Brühwiler
2024

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/35840c70-8ebf-40e5-afae-7dd261e4ee26

About this result

Related concepts (32)

Reinforced concrete

Reinforced concrete, also called ferroconcrete, is a composite material in which concrete's relatively low tensile strength and ductility are compensated for by the inclusion of reinforcement having higher tensile strength or ductility. The reinforcement is usually, though not necessarily, steel bars (rebar) and is usually embedded passively in the concrete before the concrete sets. However, post-tensioning is also employed as a technique to reinforce the concrete. In terms of volume used annually, it is one of the most common engineering materials.

Fatigue (material)

In materials science, fatigue is the initiation and propagation of cracks in a material due to cyclic loading. Once a fatigue crack has initiated, it grows a small amount with each loading cycle, typically producing striations on some parts of the fracture surface. The crack will continue to grow until it reaches a critical size, which occurs when the stress intensity factor of the crack exceeds the fracture toughness of the material, producing rapid propagation and typically complete fracture of the structure.

Design

A design is a concept of either an object, a process, or a system that is specific and, in most cases, detailed. Design refers to something that is or has been intentionally created by a thinking agent, though it is sometimes used to refer to the nature of something. The verb to design expresses the process of developing a design. In some cases, the direct construction of an object without an explicit prior plan may also be considered to be a design (such as in some artwork and craftwork).

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Fatigue behavior of UHPFRC and its implementation for design

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