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Alain Nussbaumer

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Related publications (111)

Traffic load generation for the fatigue assessment of the 3rd Bosphorus bridge

Alain Nussbaumer, Cláudio Alexandre Pereira Baptista

This report presents the traffic simulation model for the fatigue life prediction of the stiffening cables and hangers from the 3rd Bosporus bridge in Istanbul, a 2164m long hybrid suspended/stay-cable bridge with a main span of 1408m. Probabilistic models ...

ICOM2015

Microstructural influence on the scatter in the fatigue life of steel reinforcement bars

Eugen Brühwiler, Alain Nussbaumer, Marina Rocha Pinto Portela Nunes

Fatigue damage accumulation and failure of steel reinforcement bars (rebars) is a stochastic process. Scatter can be influenced by the sensitivity of the short crack growth to the microstructural features, especially near the fatigue limit. This work inves ...

Elsevier2015

Fatigue behaviour and detailing of slotted tubular connection

Alain Nussbaumer, Luís Costa Borges, Cláudio Alexandre Pereira Baptista, Santosh Yadav

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

Welding simulation of tubular K-joints in steel S690QH

Jean-Marie Drezet, Alain Nussbaumer, Farshid Zamiri Akhlaghi

Residual stress state in planar tubular K-joints, in the chord within the gap region between the two braces, is studied using numerical weld modelling. The motivation comes from past full-scale fatigue tests on tubular trusses made of various steel grades ...

CRC press2015

Fatigue behaviour prediction of steel reinforcement bars using an adapted Navarro and De Los Rios model

Eugen Brühwiler, Alain Nussbaumer, Marina Rocha Pinto Portela Nunes

Fatigue cracks tend to initiate on the rebar surface and therefore, the surface conditions may control their fatigue behaviour. This study investigates the influence of surface microstructure and roughness dispersion on the scatter and fatigue life of hot ...

Elsevier Sci Ltd2015

Fatigue design criteria for strengthening metallic beams with bonded CFRP plates

Alain Nussbaumer, Mario Fontana, Elyas Ghafoori, Masoud Motavalli

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

A reanalysis of the fatigue strength of steel plates with holes, for application of the notch stress approach

Alain Nussbaumer, Cláudio Alexandre Pereira Baptista

2014

S-N-P Fatigue Curves using Maximum Likelihood

Eugen Brühwiler, Alain Nussbaumer, Marina Rocha Pinto Portela Nunes, Luca D'Angelo

ECCS European Convention for Constructional Steelwork2014

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

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

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

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

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

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

Jean-Marie Drezet, Claire Acevedo, Alain Nussbaumer

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

Simultaneous Vehicle Crossing Effects on Fatigue Damage Equivalence Factors for North American Roadway Bridges

Alain Nussbaumer, Scott Walbridge, Vincent Fischer, Nariman Maddah

In many design codes for roadway bridges, fatigue design involves passing a load model over an influence line for a critical location on the bridge and then determining the resulting nominal stress range. For fatigue design in the finite-life domain, this ...

American Society of Civil Engineers2013

Building on planet Mars student project

Peter Zurbrügg, Suren Erkman, Alain Nussbaumer, Théodore Besson

Taylor & Francis Group2013

Fatigue Life Assessment of Existing Motorway Bridge

André-Gilles Dumont, Alain Nussbaumer, Marc-Antoine Fénart, Luca D'Angelo

The aim of this paper is to provide a fatigue-life assessment of an existing composite steel-concrete bridge within Switzerland. The Venoge bridge is a 219 meters length, four spans, four girder composite bridge, situ-ated on the Geneva-Lausanne Swiss moto ...

CRC Press/Balkema2013

On the low-cycle fatigue capacity of unanchored steel liquid storage tank shell-to-base connections

Alain Nussbaumer, Gary Scott Prinz

Under strong earthquake motions, the liquid stored within large unanchored steel tanks can cause rocking and uplift of the tank base from the supporting foundation. Repeated rocking can lead to low-cycle fatigue fractures in the tank base-plate, and ultima ...

Springer Verlag2012

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

Alain Nussbaumer, Gustavo Cortes, Gary Scott Prinz

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

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

Alain Nussbaumer, Gary Scott Prinz, Shyam Khadka

2012

Advanced Numerical Modeling of Cracked Tubular K Joints: BEM and FEM Comparison

Alain Nussbaumer, Luís Costa Borges

A critical aspect in the design of tubular bridges is the fatigue performance of the structural joints. The estimation of a fatigue crack life using the linear elastic fracture mechanics (LEFM) theory involves the calculation of stress intensity factors (S ...

American Society of Civil Engineers2012

Fatigue analysis of liquid-storage tank shell-to-base connections under multi-axial loading

Alain Nussbaumer, Gary Scott Prinz

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 and large multi-axial stresses (radial tension and circumferential compression) in the tank ...

Elsevier2012

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