Publications de Andrin Herwig | EPFL Graph Search

Fatigue strengthening of riveted girders in a historic railway metallic bridge in Switzerland using pre-stressed un-bonded CFRP laminates

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

CRC Press2016

Determination of minimum CFRP pre-stress levels for fatigue crack prevention in retrofitted metallic beams

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

The majority of fatigue strengthening studies focus on reducing propagation rates of existing cracks, ignoring the crack initiation stage. Many existing metallic bridge members however do not contain existing cracks, but rather are nearing their design fat ...

Elsevier2015

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

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

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

Fatigue strengthening of damaged metallic beams using prestressed unbonded and bonded CFRP plates

John Botsis, Matteo Galli, Masoud Motavalli, Andrin Herwig, Elyas Ghafoori

Bonded fiber reinforced polymers (FRPs) reinforcement systems have traditionally been found to be an efficient method for improving the lifespan of fatigued metallic structures and have attracted much research attention. Nevertheless, the performance of a ...

Elsevier2012

Consideration of dynamic traffic action effects on existing bridges at ultimate limit state

Eugen Brühwiler, Andrin Herwig

Dynamic energy due to ultimate limit state relevant traffic scenarios may completely be dissipated by plastic deformations without failure of the bridge element. If the structure shows significant strain hardening behaviour, the maximum static effect is al ...

Taylor & Francis Group2008

Structural assessment of concrete bridges, XXth Symposium

Eugen Brühwiler, Andrin Herwig

Roger Andersson, Informationsansvarig2008

Reinforced concrete bridges under increased railway traffic loads : fatigue behaviour and safety measures

Andrin Herwig

The aim of this thesis is to provide rational engineering methods for the fatigue safety examination of existing railway bridges. Increasing railway traffic loading and enhanced structural analysis allow for higher exploitation of the capacity of bridge el ...

EPFL2008

Accurate fatigue stress determination in concrete railway bridges considering rail track - structure interaction

Eugen Brühwiler, Andrin Herwig

So-called “non-load bearing” parts of (railway) bridges increase the stiffness and decrease the stresses in short span bridge structures. The rail track, consisting of ballast, sleepers and rails, has a non-linear behaviour and its rigidity depends on the ...

2006