A Novel Bridge Section Model Endowed with Actively Controlled Flap Arrays Mitigating Wind Impact

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Multiaxial and variable amplitude fatigue in steel bridges

Modern bridge construction all over Europe in the last decades, has highlighted the importance of steel solutions for the design of bridges. Steel bridges have become slender and lighter with the generalisation of welded connections. These features increas ...

EPFL2016

Flutter Suppression of a Bridge Section Model Endowed with Actively Controlled Flap Arrays

Alcherio Martinoli, Klara Maria Boberg, Glauco Feltrin

In this work, we investigate active flutter control of a bridge section model equipped with arrays of flaps. We consider three simple control algorithms based on an amplitudegain and a phase-shift for actuating the flaps and stabilizing the section model. ...

2015

Résistance au déversement des poutres métalliques de pont

Raphaël Thiébaud

Steel and steel-concrete composite bridges made of plate girders represent an economical structural form and are largely used for short and medium spans. Two parallel plate girders connected by cross-beams define a twin-girder bridge. This type of bridge t ...

EPFL2014

A monitoring system for determination of real deck slab behaviour in prestressed box girder bridges

Eugen Brühwiler, Mark Anthony Treacy

Due to ever increasing traffic demands the fatigue safety and service life of the bridges of a railway line in Brazil need to be examined. Conventional assessment methods using load models and approaches as suggested in codes lead to conservative results r ...

CRC Press/Balkema2012

Structural Response of R-UHPFRC - RC Composite Members Subjected to Combined Bending and Shear

Talayeh Noshiravani

The addition of a thin overlay of Ultra-High Performance Fibre Reinforced Concrete (UHPFRC) to Reinforced Concrete (RC) members is an emerging technique to strengthen and protect existing structures and to design durable new structures. Combining UHPFRC wi ...

EPFL2012

Study on room modal equalization at low frequencies with electroacoustic absorbers

Hervé Lissek, Romain Boulandet, Etienne Thierry Jean-Luc Rivet, Iris Rigas

Nowadays, requirements for acoustic treatments in rooms are ever more demanding in terms of performance and compactness. A recurring issue in closed spaces is the occurrence of standing waves and acoustic interferences at low frequencies. These unwanted ph ...

2012

Transition Slabs of Integral Abutment Bridges

Aurelio Muttoni, Olivier Burdet, Damien Dreier

Over the past decades, an increasing number of bridges with integral abutment have been built in Switzerland. This type of bridge offers various advantages over standard bridges with abutments, equipped with expansion joints and bearings that require regul ...

Structural Engineering International2011

Electroacoustic absorbers I: bridging a gap between active acoustic feedback control and shunt loudspeakers

Hervé Lissek, Romain Christophe Rémy Fleury, Romain Boulandet

Variable acoustic properties can be obtained at the diaphragm of an electroacoustic transducer, with the help of very basic control strategies, among which is the simple electrical shunting of the transducer. These shunt techniques are compared to active a ...

2011

Electroacoustic absorbers: Bridging the gap between shunt loudspeakers and active sound absorption

Romain Christophe Rémy Fleury, Hervé Lissek, Romain Boulandet

The acoustic impedance at the diaphragm of an electroacoustic transducer can be varied using a range of basic electrical control strategies, amongst which are electrical shunt circuits. These passive shunt techniques are compared to active acoustic feedbac ...

Acoustical Society of America2011

Practical active and semi-active strategies for the control of room acoustics in the low frequency range

Hervé Lissek, Romain Boulandet, Anne-Sophie Moreau

Modal acoustics is one of the main sources of annoyance in the low frequency range in rooms. Active noise control techniques can be deployed to reach sufficient acoustic benefit, but limited to a single frequency, whereas broader efficiency would require c ...

2010

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