Composed Isolation System Concept
for Vibration Effects Mitigation
on Bridge Structures
Fanel Scheaua
Abstract A bridge structure represents an important infrastructure component
capable of withstanding considerable efforts from traffic, wind, or seismic actions.
To meet the stability requirements, these structures are designed to cope with the
most unfavorable static and dynamic loading situations. At present, isolation solutions are available for these structures types by adding auxiliary mechanical systems
to the bridge structure base so that the structure’s response is modified when considerable external forces requesting the resistance structure occur. These systems are
considered as isolation, and energy dissipation devices being increasingly used in
building practice at present. In this paper, a composed isolation system is presented
that combines the insulator role of pendulum sliding bearing with the dissipation
role of viscous fluid systems. For better isolation results of the composed system,
elastomeric elements have been added to the base of the sliding bearing so that these
elements have the ability to attenuate vibrations from different dynamic actions.
There are presented modeling elements and results of numerical analyzes made for the
pendulum sliding isolating system model. By combining the action of the composite
system elements, a complete insulation of a bridge structure can be achieved against
the effects of intense and varied vibratory actions having advantage over the use of
a single type of protective system meant to isolate the bridge structure.
1 Introduction
The use of dampers against forced vibration actions acting on buildings is current all
over the world today. Anchor protection systems are based on specially designed
mechanical devices that have the possibility to enter into operation when an
earthquake occurs and to protect the building against structural degradation or
collapse.
F. Scheaua (B)
“Dunarea de Jos” University of Galati, Engineering and Agronomy Faculty of Braila, MECMET
Research Center, Galati, Romania
e-mail: fanel.scheaua@ugal.ro
© Springer Nature Switzerland AG 2021
N. Herisanu and V. Marinca (eds.), Acoustics and Vibration of Mechanical
Structures—AVMS 2019, Springer Proceedings in Physics 251,
https://doi.org/10.1007/978-3-030-54136-1_48
473
for Vibration Effects Mitigation
on Bridge Structures
Fanel Scheaua
Abstract A bridge structure represents an important infrastructure component
capable of withstanding considerable efforts from traffic, wind, or seismic actions.
To meet the stability requirements, these structures are designed to cope with the
most unfavorable static and dynamic loading situations. At present, isolation solutions are available for these structures types by adding auxiliary mechanical systems
to the bridge structure base so that the structure’s response is modified when considerable external forces requesting the resistance structure occur. These systems are
considered as isolation, and energy dissipation devices being increasingly used in
building practice at present. In this paper, a composed isolation system is presented
that combines the insulator role of pendulum sliding bearing with the dissipation
role of viscous fluid systems. For better isolation results of the composed system,
elastomeric elements have been added to the base of the sliding bearing so that these
elements have the ability to attenuate vibrations from different dynamic actions.
There are presented modeling elements and results of numerical analyzes made for the
pendulum sliding isolating system model. By combining the action of the composite
system elements, a complete insulation of a bridge structure can be achieved against
the effects of intense and varied vibratory actions having advantage over the use of
a single type of protective system meant to isolate the bridge structure.
1 Introduction
The use of dampers against forced vibration actions acting on buildings is current all
over the world today. Anchor protection systems are based on specially designed
mechanical devices that have the possibility to enter into operation when an
earthquake occurs and to protect the building against structural degradation or
collapse.
F. Scheaua (B)
“Dunarea de Jos” University of Galati, Engineering and Agronomy Faculty of Braila, MECMET
Research Center, Galati, Romania
e-mail: fanel.scheaua@ugal.ro
© Springer Nature Switzerland AG 2021
N. Herisanu and V. Marinca (eds.), Acoustics and Vibration of Mechanical
Structures—AVMS 2019, Springer Proceedings in Physics 251,
https://doi.org/10.1007/978-3-030-54136-1_48
473