Considerations on operating principle of fluid viscous dissipation model used for bridge seismic isolation

Journal Title: Romanian Journal of Acoustics and Vibration - Year 2014, Vol 11, Issue 2

Abstract

The main concern of structural engineers is related to capabilities to ensure structure stability during seismic actions. Therefore different mechanical systems have been designed which can be attached to structures in order to change their behavior during earthquakes. This paper presents a special device that can be mounted at bridge or viaduct structures aiming to obtain an improved behavior of these structures during earthquake actions. The special device is presented as a hydraulic system that can assure dissipation of earthquake input energy. Along with the sliding and elastomeric bearings, the fluid viscous device may form a complete safety system capable to protect the isolated structure from the earthquake destructive actions. The fluid viscous system is composed of a cylinder with piston which can be translated inside the cylinder through the hydraulic fluid due to the orifices formed in the piston head. The fluid used for these special devices is typically mineral or silicone oil. Usually viscous fluid devices are connecting the bridge foundation and superstructure, so that in the occurrence of an earthquake, the piston is forced to move through the fluid medium inside the cylinder. Due to the low value of the passage orifices diameter the displacement is strongly restrained. Because of this resistance achieved at the hydraulic device ends a considerable amount of energy from the total earthquake energy is taken over, dissipated and converted into caloric energy due to internal friction forces, being after transferred to the external environment through the cylinder walls. In this paper it is presented a model of viscous fluid dissipation device that can be used in isolation of bridge or viaduct structural types against seismic activities. A three-dimensional assembly model was conducted at a reduced scale for the device equipped with flanges for clamping to the structural elements which has been analyzed in terms of operation principle using ANSYS FLOWIZARD program.

Authors and Affiliations

Scheaua FANEL

Keywords

Related Articles

Investigation Composite Materials for its Sound Absorption Properties

This paper presents research on determining the sound absorption coefficient depending on frequency, for each sample, thus determining the sound absorption capacity of each obtained material. Materials were made from par...

Numerical Simulation of Real Contact Between Two Bodies

This paper presents the effects appearing inside a beam from a overpass of Arad-Timisoara highway due to impact with a high dumper of a moving vehicle. For this analysis it is developed a simplified calculation and a num...

The Analysis of Factors That Influence the Sound Absorption Coefficient of Porous Materials

In this paper are presented researches on the identification of factors that influence the sound absorption coefficient of porous materials used for absorption of the sound wave. To achieve these researches were used thr...

Dependence of the Concrete Strength on the Duration of the Compaction by Vibration Process

The aim of the paper is to present the experimental results performed on two categories of concrete, C35/40 and C40/50, in order to highlight the evolution of their compressive strength with respect to the duration of vi...

Download PDF file
  • EP ID EP133009
  • DOI -
  • Views 84
  • Downloads 0

How To Cite

Scheaua FANEL (2014). Considerations on operating principle of fluid viscous dissipation model used for bridge seismic isolation. Romanian Journal of Acoustics and Vibration, 11(2), 142-145. https://europub.co.uk/articles/-A-133009