Obiettivo
The final results obtained with the large-scale cable-stayed mock-up are better than initially expected.
An active damping technique based on a tendon actuator collocated with a force sensor has now been developed. These actuators have been manufactured and widely tested on a large-scale cable-stayed mock-up. These technologies are directly applicable to real structures by scaling up the devices.
The approximate linear theory developed by Universite Libre de Bruxelles remains applicable even for complex civil structures. The prediction of the expected damping value is in good accordance with the experimental values. Analytical design rules have been studied regarding the actuators. Manufacturing procedures have been developed by the device manufacturers. Moreover, direct theoretical application to real structures by the civil engineering experts including technical and economic aspects has exhibited the efficiency of the active control system and the large field of application to cable-supported structures.
Bridges are required for the transportation infrastructure of any country. Cable supported structures and particularly long span suspension or cable stayed bridges are among the most important engineering structures of the second half of this century. Today, it can be claimed that cable stayed bridges have entered a golden age. A full use of structural materials, an efficient structural scheme, a technological efficiency and a fast construction, a higher stiffness in comparison with suspension bridges and an easier maintenance and replacement of cables are the reasons for their ever increasing number world wide.
Improvements in materials led to the construction of progressively longer, structurally more efficient and slender bridges. But consequently, structures are more and more flexible. Deck and cable vibrations have become a major issue in cable stayed bridge design. Their increasing span length makes them more sensitive to flutter instability as well as to wind and live load induced vibrations. It is a difficult problem to assess because of the highly non linear behavior of cables with sag. Avoiding significant levels of wind excited oscillations, resulting in levels of vibration, and in the worst case in flutter instability is a new challenge for the designers. In the long term there is a potential for serious fatigue damage. In the short term, excessive levels of vibration hamper the traffic and bother the end user comfort.
To minimise cable vibrations, passive damping devices for stay cables have already been developed and used, especially dashpot dampers, cable ties and visco elastic systems. Tuned Mass Dampers have also been studied. The dashpot damper delay the appearance of vibrations, but only until a certain level of excitation. Elements of cable tie systems are subjected to important variations of tensile force which can cause strong shocks. Even used on actual bridges, their long term behavior to fatigue has still to be proved. Tuned Mass Dampers efficiency is limited by the geometrical constraints of the deck cross-section. In addition, all these passive devices are tuned on theoretical simulation results, which can be partly far away from the real world, and fit only with previous predefined scenarios. In some cases, a part of the energy filtered is transferred to an other vibration modes. Finally, these devices do not take into account the aging of the structure components, and consequently the variation in time of the structure behavior.
The technical objectives of this project are, therefore, to:improve the understanding of the induced vibrations of cable supported structures
improve an appropriate software package capable of analysing the behavior of cable supported structures,
develop an active system to control induced vibrations of cable supported structures
develop the appropriate actuators, and
validate the active control system with high scale mock ups and measurements of existing structures.
The deliverables of this project will make it possible for the various industrial involved in cable supported structures to understand and predict the behavior of the structures when exposed to:
1. wind induced vibrations,
2. live load induced vibrations,
3. seismic induced vibrations.
Campo scientifico (EuroSciVoc)
CORDIS classifica i progetti con EuroSciVoc, una tassonomia multilingue dei campi scientifici, attraverso un processo semi-automatico basato su tecniche NLP. Cfr.: Il Vocabolario Scientifico Europeo.
CORDIS classifica i progetti con EuroSciVoc, una tassonomia multilingue dei campi scientifici, attraverso un processo semi-automatico basato su tecniche NLP. Cfr.: Il Vocabolario Scientifico Europeo.
- scienze naturali informatica e scienze dell'informazione software
- ingegneria e tecnologia ingegneria elettrica, ingegneria elettronica, ingegneria informatica ingegneria elettronica sistemi di controllo
- ingegneria e tecnologia ingegneria civile
- ingegneria e tecnologia ingegneria elettrica, ingegneria elettronica, ingegneria informatica ingegneria elettronica sensori
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Meccanismo di finanziamento (o «Tipo di azione») all’interno di un programma con caratteristiche comuni. Specifica: l’ambito di ciò che viene finanziato; il tasso di rimborso; i criteri di valutazione specifici per qualificarsi per il finanziamento; l’uso di forme semplificate di costi come gli importi forfettari.
Coordinatore
78061 Saint-Quentin-en-Yvelines
Francia
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