Publications de Alain Nussbaumer

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

Eugen Brühwiler, Alain Nussbaumer, Jian Zhan

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 ...

2025

Models and methods for probabilistic safety assessment of steel structures subject to fatigue

Alain Nussbaumer

The modelling of randomness and uncertainty in fatigue resistance and fatigue load variables are presented in some detail. This is followed by a review of the specifics of reliability analysis for fatigue limit states and a background on the semi-probabili ...

2025

High cycle tensile fatigue behavior of steel rebar reinforced - UHPFRC at high R-ratio

Eugen Brühwiler, Alain Nussbaumer, Jian Zhan

This paper investigates the high cycle tensile fatigue behavior of steel rebar reinforced − UHPFRC elements, at a fatigue load ratio, i.e., R-ratio of 0.3, representative for structural applications. Prior to testing, magnetoscopy is conducted on each spec ...

2025

Model uncertainties in action effects and load bearing capacity calculation in statically indeterminate reinforced concrete structures

Aurelio Muttoni, Alain Nussbaumer, Xhemsi Malja

For the dimensioning and assessment of structures, it is common practice to compare action effects with sectional resistances. Extensive studies have been performed to quantify the model uncertainty on the resistance side. However, for statically indetermi ...

Ernst & Sohn2024

Evaluation des ponts routiers existants avec un modèle de charge de trafic actualisé. Modélisation des dalles de roulement des ponts-poutres (Rapport interne EPFL n° 306891-2). - Édition 2024 V1.01

Alain Nussbaumer

EPFL Ecole polytechnique fédérale de Lausanne2024

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

Eugen Brühwiler, Alain Nussbaumer, Jian Zhan

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 ...

2024

Strain-based analysis on the influence of local undercut geometry on fatigue crack initiation life

Alain Nussbaumer, Heikki Tapani Remes, Abinab Niraula

The local undercut defects at the weld toe provide a potential initiation site for fatigue cracks and significantly impact the structure's fatigue strength. The influence of continuous undercut depth on fatigue performance is widely studied, but the resear ...

2024

Evaluation des ponts routiers existants avec un modèle de charge de trafic actualisé. Modélisation des ponts bipoutres (Rapport interne EPFL n° 306891-1). - Édition 2024 V1.03

Alain Nussbaumer

EPFL Ecole polytechnique fédérale de Lausanne2024

Evaluation des ponts routiers existants avec un modèle de charge de trafic actualisé. Modélisation des ponts dalles et cadres (Rapport interne EPFL n° 306891-3). - Édition 2024 V1.04

Alain Nussbaumer

EPFL Ecole polytechnique fédérale de Lausanne2024

A WIM-Based Assessment of Multiple Vehicle Presence Effects on Fatigue Damage of Highway Bridges

Alain Nussbaumer, Scott Walbridge, Matthew James Sjaarda

The fatigue provisions for bridge design in North America and Europe are highly simplified for the sake of practical implementation, in comparison with the state of the art in understanding of the true fatigue behavior. Historically, one significant simpli ...

2024