Publications by Eugen Brühwiler

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To explore the governing mechanism underlying the tensile fatigue behavior of Ultra-high Performance Fiber Reinforced Cementitious Composites (UHPFRC), this study tested eight specimens using four advanced non-destructive measurement techniques. First, mag ...

The extremely low permeability of Ultra High Performance Fibre Reinforced Concretes (UHPFRC) associated to their outstanding mechanical properties make them especially suitable to locally "harden" reinforced concrete structures in critical zones subjected ...

The application on existing Reinforced Concrete (RC) slabs of cast-on site Ultra-High Performance Fiber Reinforced cement-based Composite UHPFRC) layers is a very efficient reinforcement technique, currently spreading. For the design of these tensile reinf ...

This paper quantitatively studies the influence of fiber orientation on the high cycle tensile fatigue resistance of ultra-high performance fiber reinforced cementitious composites (UHPFRC) within and beyond elastic domain. Eight tensile fatigue tests and ...

To date, there have been few reports of fatigue problems in medium-span reinforced or prestressed concrete road bridges, primarily due to the high ratio of the dead load to live load in such structures. Where fatigue problems have arisen, they have general ...

The purpose of this paper is to investigate experimentally the UHPFRC time-dependent behavior under sustained tensile loading and to determine the effect of the stress level on the creep response. Uniaxial tensile creep tests were performed at various stress levels by means of an optimized testing set-up. An Acoustic Emissions equipment was used in parallel to correlate the creep deformations with damage. From 29 % to 85 % stress level, the material exhibited a linear viscoelastic behavior. The UHPFRC respo

New methods are required for sustainable and economical management of bridges. Efficient management can be achieved by a detailed understanding of bridge behavior through monitoring and model-based data interpretation. This paper presents a methodology to ...

An original concept is presented for the durable rehabilitation of concrete bridge deck slabs. The main idea is to add a layer of Ultra-High Performance Fiber Reinforced Concrete (UHPFRC) with steel reinforcing bars over the concrete slab to create a compo ...

This paper investigates experimentally the biaxial flexural fatigue behavior of thin circular slab specimens made of Ultra High Performance Fibre Reinforced Cementitious Composite (UHPFRC), using ring-on-ring test method. The circular slab specimens repres ...

To strengthen a reinforced concrete (RC) slab with deficient shear resistance, it is proposed to add to the top of the slab a 25-50 mm thick layer of ultra-high performance fibre reinforced cement-based composite (UHPFRC) with small diameter rebars (R-UHPF ...

Existing bridges in reinforced concrete (RC) need to be enhanced in order to comply with utilization and safety requirements of future use, in particular for higher traffic loads. Such enhancements comprise strengthening to increase the structural resistan ...

Located in Switzerland, Chillon viaducts are two parallel highway posttensioned concrete bridges built in the late 1960s. The concrete of the deck slabs of these bridges shows signs of early stages of the alkali-aggregate reaction (AAR), which will induce, in time, a decrease of the concrete strength. To insure structural safety for future traffic demands, it was decided to strengthen the slab by adding a layer of 40 mm of an Ultra High Performance Fiber Reinforced cement-based Composite (UHPFRC) material,

The case study of the fatigue safety examination of the 120 years old steel riveted bridge carrying a single railway track on two main girders is presented. The overall assessment according to the Swiss Standard SIA 269 for existing structures indicated su ...

The extremely low permeability of Ultra-High Performance Fibre Reinforced Concretes (UHPFRC)associated to their outstanding mechanical properties make them especially suitable to locally "harden" reinforced concrete structures in critical zones subjected t ...

Current design procedures for structural concrete elements are based on member level (or local) safety checks, in the sense that the safety condition is evaluated at each cross-section individually. In the examination of existing structures, the exploitati ...

The representative characterization of the tensile behavior of strain hardening Ultra High Performance Fiber Reinforced Cementitious Composite (UHPFRC) remains a challenge. Currently, the uniaxial methods (direct tensile test and 4-point bending test) are ...

In this paper, a method for predicting the evolution of fatigue deterioration of structural components using continuum mechanics numerical simulation is presented. At a first stage, prediction will be limited to the evaluation of the end of the initiation phase of the fatigue process. The method is intended for cases where the loading history demonstrates certain repetitiveness (as it is the case for railway traffic induced loading) and is based on the characterization of the deterioration potential of thes

In structures, where UHPFRC is subjected to a high number of fatigue stress cycles, the tensile fatigue behavior is critical and must be well understood. This paper studies the high cycle tensile fatigue behavior of UHPFRC utilizing four advanced measurement techniques. Sixteen fatigue specimens from a previous study are re-analyzed and eight specimens are tested. Prior to testing, the local fiber orientation and dosage are determined using a magnetic probe. During testing, specimen behavior is monitored by

Rehabilitation projects aim to enhance durability and to ensure structural safety. Ultra-High Per-formance Fibre Reinforced Concretes (UHPFRC) may fulfil these requirements when used as conservation materials. The structural response of composite UHPFRC-c ...

Stresses in bridges due to traffic loading need to be determined as accurately as possible for reliable fatigue safety verification. In particular, the dynamic traffic effect due to running vehicles has to be considered in a realistic way. In-situ measurements of the dynamic behavior of a one-track railway bridge have been performed to analyze the complex elastic dynamic system consisting of running trains—railway track—bridge structure. The main causes for dynamic effects for fatigue relevant bridge elemen

Eugen Brühwiler

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Deciphering tensile fatigue behavior of UHPFRC using magnetoscopy, DIC and acoustic emission

Towards more efficient structures with composite UHPFRC-concrete construction

Effect of fiber orientation on the in-plane tensile response of UHPFRC reinforcement layers

Influence of fiber orientation on the high cycle tensile fatigue resistance of Ultra-High Performance Fiber Reinforced Cementitious

A direct monitoring approach for the fatigue safety verification of construction joint details in an existing post-tensioned concrete box-girder bridge

TENSILE CREEP OF UHPFRC UNDER LOW AND HIGH STRESSES

Model-Based Interpretation of Measurements for Fatigue Evaluation of Existing Reinforced Concrete Bridges

Concrete bridge deck slabs strengthened with UHPFRC

Flexural fatigue behavior of circular UHPFRC slab specimens

Contribution of R-UHPFRC Strengthening Layers to the Shear Resistance of RC Elements

Bridge enhancement by means of the UHPFRC Technology: concepts and recent applications

Strengthening the Chillon viaducts deck slabs with reinforced UHPFRC

Fatigue safety verification of a steel railway bridge using short term monitoring data

Thermo mechanical effects in Ultra-High Performance Fibre Reinforced Concretes (UHPFRC) at early age

Safety examination of existing concrete structures using the global resistance safety factor concept

Tensile Behavior of UHPFRC Under Uniaxial And Biaxial Conditions

The Fatigue Deterioration Potential of Railway Traffic

High cycle tensile fatigue behavior of UHPFRC

Structural response of hybrid "UHPFRC - concrete" members under bending"

In-situ dynamic behavior of a railway bridge girder under fatigue causing traffic loading