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Alain Nussbaumer

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Publications associées (111)

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Strain-based approach to fatigue crack initiation on high-strength-steel welded joints under multiaxial loading

Alain Nussbaumer, Martin Antonio René Garcia

A recently novel strain-based approach recently proposed by Remes (Remes 2013) for the fatigue strength modelling of welded steel joints is extended here to consider multiaxial loading conditions and three dimensions finite element models. Only the first s ...

CRC Press (Taylor & Francis)2019

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

Finite element modeling for fatigue strengthening of metallic riveted bridges using un-bonded pre-stressed CFRP plates

Alain Nussbaumer, Elyas Ghafoori, Gary Scott Prinz, Andrin Herwig, Mario Fontana

Many old riveted steel bridges remain operational and require retrofit to accommodate ever increasing demands. Complicating retrofit efforts, riveted steel bridges are often considered historical structures and as such structural modifications that affect ...

2013

Experimental study on the fatigue behaviour of welded tubular K-joints for bridges

Alain Nussbaumer

Fatigue tests were carried out on welded circular hollow section K-joints typical to bridges. The tests specimens were large-scale (approximately 9 m long and 2 m high) trusses loaded in the plane of the truss. Measured member stresses showed that a signif ...

Elsevier2006

New experimental determination of fatigue strength of tubular truss joints in steel grades up to S690

Alain Nussbaumer, Farshid Zamiri Akhlaghi

In this paper research work on welded butt weld connections between hot-rolled seamless tubes and steel castings are presented. Comparison is made between different weld preparations for the butt welds including different steel grades, repair methods, the ...

CRC press2015

New developments on fatigue in Eurocode on steel structures

Alain Nussbaumer

The design rules for the verification of civil engineering steel structures against fatigue are compiled in the European harmonized design standard Eurocode EN 1993-1-9 released in 2005. This design standard is currently under revision, together with all o ...

Elsevier B.V.2023

Effect of tensile residual stresses on fatigue crack growth and S-N curves in tubular joints loaded in compression

Alain Nussbaumer, Claire Acevedo

The influence of welding tensile residual stresses on fatigue crack growth in bridge tubular K-joints is investigated through experimental testing of large-scale specimens. Crack development is monitored using the alternating current potential drop method. ...

Elsevier2012

Measurement, Data Interpretation, and Uncertainty Propagation for Fatigue Assessments of Structures

Ian Smith, Alain Nussbaumer, James-Alexandre Goulet, Romain Pasquier, Claire Acevedo, Luca D'Angelo

Real behavior of existing structures is usually associated with large uncertainty that is often covered by the use of conservative models and code practices for the evaluation of remaining fatigue lives. In order to make better decisions related to retrofi ...

American Society of Civil Engineers2016

Fatigue behaviour and detailing of slotted tubular connection

Alain Nussbaumer, Luís Costa Borges, Cláudio Alexandre Pereira Baptista

Tubular elements are used in steel structures not only for bracing of other members but also as cross girders diaphragms. They are a competitive solution both due to the lightweight and structural efficiency. Slotted tube-to-plate connections are the natur ...

2015

Computational Investigation of Mode-I Fatigue Crack Growth in CFRP-Strengthened Steel Plates with a Cohesive Zone Model

Alain Nussbaumer

An increasing number of existing steel structures are nowadays at the end of their service lives and most of them are subjected to fatigue loading. To tackle the fatigue problem, carbon fiber-reinforced polymer (CFRP) composites have been proposed and succ ...

SPRINGER-VERLAG SINGAPORE PTE LTD2022

A probabilistic assessment of the effect of post-weld treatment on the fatigue performance of tubular truss bridges

Alain Nussbaumer, Scott Walbridge

In the design of tubular truss bridges, engineers have found the fatigue performance of the joints to be a critical aspect. In looking for ways to improve this performance, the use of residual stress-based post-weld treatments has been suggested. Although ...

Elsevier2008

Fatigue design of cast steel nodes in tubular bridge structures

Alain Nussbaumer, Senta Haldimann

Due to their aesthetic and structural advantages, tubular space truss structures are enjoying increasing popularity in modern bridge construction. The use of cast steel nodes for the joints between the circular hollow section members is also becoming incre ...

Elsevier2008

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

The impact of heavy vehicle platoons on bridge traffic loads

Alain Nussbaumer, Matthew James Sjaarda

Traffic experts expect that interconnected autonomous vehicles will be implemented on roads in the near future to reduce emissions and to increase safety on roads [1], [2]. Since the navigation of vehicles in platoons is highly time synchronized, current i ...

International Association for Bridge and Structural Engineering (IABSE)2021

Development of a Strengthening System for Riveted/Bolted Steel Connections Using Prestressed CFRP Rods

Alain Nussbaumer

Among different details in old riveted railway bridges throughout the world, connections such as stringer-to-floor-beam double-angle connections are one of the most fatigue-prone details. These connections are subjected to fatigue loadings due to the secon ...

SPRINGER-VERLAG SINGAPORE PTE LTD2022

Fatigue analysis of unanchored steel liquid storage tank shell-to-base connections during earthquake induced uplift

Alain Nussbaumer, Gary Scott Prinz, Gustavo Cortes

During severe seismic events the base of unanchored steel liquid-storage tanks can uplift, causing large inelastic rotation demands at the shell-to-base connections. With repeated cycles of uplift, these shell-to-base connections are susceptible to low-cyc ...

2012

A novel triaxial failure model for adhesive connections in structural glass applications

Alain Nussbaumer, Pieter Christian Louter, Manuel Santarsiero

2018

Influence of welding residual stresses on stable crack growth in tubular K-joints under compressive fatigue loadings

Alain Nussbaumer, Claire Acevedo

Tubular bridge design has to deal with fatigue issues. The fatigue susceptibility of these bridges, composed of circular hollow section profiles welded together in K-joints, is mainly due to stress concentrations, to welding imperfections and to tensile re ...

CRC Press/Balkema, Taylor & Francis group2010

Analytical approach for improving damage equivalence factors

Alain Nussbaumer, Nariman Maddah

The fatigue design of bridges under variable amplitude traffic loads is not straightforward. To simplify the task, the current Eurocode provisions apply fatigue load model 3 and damage equivalence factors (lambda). However, the fatigue load model and the d ...

Elsevier2014

Very high cycle fatigue tests with quenched and self-tempered reinforcement steel bars

Eugen Brühwiler, Alain Nussbaumer, Marina Rocha Pinto Portela Nunes

Investigations on the fatigue strength of steel reinforcement bars (rebars) mainly involves fatigue tests with hot rolled (HR) and cold worked (CW) steels. However, in the last few decades, HR and CW rebars were replaced by quenched and selftempered (QST) ...

Springer Verlag2016