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Alain Nussbaumer

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Publications associées (111)

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Assessment of existing steel structures. A guideline for estimation of the remaining fatigue life

Alain Nussbaumer

In many countries and regions, traffic infrastructure projects suffer from low funding. The budget is tight for new infrastructure building and, thus, the importance of inspection, maintenance and assessment of the existing traffic infrastructure increases ...

Taylor & Francis2007

Fatigue design criteria for strengthening metallic beams with bonded CFRP plates

Alain Nussbaumer, Elyas Ghafoori, Masoud Motavalli, Mario Fontana

Different failure criteria used to prevent fatigue crack initiation in metallic members are described. A series of closed-form analytical solutions were developed to predict the fatigue resistance of metallic beams after strengthening with carbon fiber-rei ...

Elsevier2015

Local relaxation of residual stress in HFMI-treated high-strength steel welded joints subjected to high-peak loads

Alain Nussbaumer

This study investigates the effect of high-peak loads on local relaxation of residual stress and fatigue damage in HFMI-treated high-strength steel welded joints. The finite element simulations are applied to consider the combined effect of geometry, mater ...

Elsevier B.V.2023

Fatigue strengthening of cracked steel plates using prestressed unbonded CFRP reinforcements

Alain Nussbaumer, Elyas Ghafoori, Ardalan Hosseini, Masoud Motavalli

Fatigue strengthening of existing steel structures is of great importance and has attracted lots of interest recently. Apart from the conventional strengthening technique, i.e. utilizing bulky and heavy steel plates and its disadvantages, carbon fiber rein ...

2017

New framework for calibration of partial safety factors for fatigue design

Alain Nussbaumer, Luca D'Angelo

In Eurocode standards, three verification schemes are proposed for fatigue design under variable amplitude loadings: 1) Based on constant amplitude fatigue limit; 2) Based on constant amplitude equivalent stress range at 2.10 cycles; 3) Based on accumulate ...

Elsevier Sci Ltd2017

Laminated connections for structural glass components: a full-scale experimental study

Alain Nussbaumer, Pieter Christian Louter, Manuel Santarsiero

The use of glass material for structural components has drastically increased in the last decade. Among others, a laminated connection is a type of adhesive joint that makes use of foil interlayer adhesive to transfer forces between glass and metal parts. ...

Springer International Publishing Ag2017

Exploring the potential of the critical shear crack theory for reinforced and post-tensioned glass beams: Initial analysis and experiments

Alain Nussbaumer, Pieter Christian Louter, Jagoda Cupac

In the evolution of structural glass beam elements, the requirements for post-fracture load bearing capacity and safe failure behaviour have led to the development of reinforced and post-tensioned beams. Maximum bending capacity in the post-fracture state ...

2023

Size effects in the fatigue behavior of welded tubular bridge joints

Alain Nussbaumer, Luís Costa Borges

Tubular space trusses for bridge applications use thick-walled tubes. The reduction in fatigue resistance due to geometrical size effects is thus an important issue. In order to carry out a thorough study, both fatigue tests on large-scale specimens and ad ...

Wiley-Blackwell2008

Numerical modelling and experimental investigation on welding residual stresses in large-scale tubular K-joints

Alain Nussbaumer, Jean-Marie Drezet, Claire Acevedo

This paper is devoted to the experimental and numerical assessment of residual stresses created by welding in the region surrounding the weld toe of tubular K-shaped joints (i.e. region most sensitive to fatigue cracking). Neutron-diffraction measurements ...

Wiley-Blackwell2013

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

Alain Nussbaumer

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

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

Multiaxial fatigue criteria for prestressed strengthening of steel connections

Alain Nussbaumer, Elyas Ghafoori, Masoud Motavalli, Hossein Heydarinouri

In this study, the high-cycle fatigue behavior of bridge connections subjected to distortion-induced loadings (generating multiaxial stresses) and strengthened with prestressed elements were experimentally investigated. Thereafter, appropriate critical pla ...

ELSEVIER SCI LTD2021

Damage-Based Assessment of the Fatigue Crack Initiation Site in High-Strength Steel Welded Joints Treated by HFMI

Alain Nussbaumer

This study aimed to identify the fatigue crack initiation site of high-frequency mechanical impact (HFMI)-treated high-strength steel welded joints subjected to high peak stresses; the impact of HFMI treatment residual stress relaxation being of particular ...

MDPI2022

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

Round robin on local stress evaluation for fatigue by various FEM software

Alain Nussbaumer, Vasileios Grigoriou

The objective of this Round Robin is to assess the software influence on the structural/local stress values as determined by means of various methods. In particular the influence of (a) FEM software solver, (b) potentially software-depending element charac ...

2016

Fatigue Damage Factor Calibration for Long-Span Cable-Stayed Bridge Decks

Alain Nussbaumer, Cláudio Alexandre Pereira Baptista

Part 2 of the Eurocode 3 (EN 1993-2) proposes a straight forward fatigue verification method using a single heavy vehicle model (FLM3) and a damage equivalent factor, lambda, to represent the fatigue damaging effects of the real traffic on road bridges. Th ...

SPRINGER NATURE SWITZERLAND AG2019

Fatigue properties of as-welded and post-weld-treated high-strength steel joints: The influence of constant and variable amplitude loads

Halid Can Yildirim, Alain Nussbaumer

In HSS welded structures, HFMI allows fatigue strength improvement factors by inducing compressive residual stresses, cold-worked surface region and modifying the weld toe shape. According to the literature, the factors are proposed based on failures at CA ...

2020

Experimental testing and simulation of bolted beam-column connections having thick extended endplates and multiple bolts per row

Alain Nussbaumer, Luís Costa Borges, Gary Scott Prinz, Shyam Khadka

Retrofit of existing steel buildings often requires strengthening of the connection regions. One common connection, the bolted beam-column connection, is often strengthened in design using stiffened extended endplates, or with continuity plates welded betw ...

Elsevier2014

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

Neutron diffraction investigations on residual stresses contributing to the fatigue crack growth in ferritic steel tubular bridges

Alain Nussbaumer, Claire Acevedo

Fatigue crack growth observed in tubular K-joint specimens, typical of tubular bridge structures, always initiates at the chord crown toe locations whether the applied stress range is tensile or compressive. Even though other locations around the weld have ...

Elsevier2012