Development of a Semi-Active Bypass Viscous Damper for bridge structures subjected to dynamic loads
Variable traffic vibration loads on overcrossing and bridges are the cause of damages in essential load-bearing components could consequently lead to damage or failure of the bridge. Nowadays, the fluid viscous dampers are the most conventional energy dissipation system to implement in bridges. H...
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| Main Author: | |
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| Format: | Thesis |
| Language: | English |
| Published: |
2021
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| Subjects: | |
| Online Access: | http://psasir.upm.edu.my/id/eprint/114837/1/114837.pdf http://psasir.upm.edu.my/id/eprint/114837/ http://ethesis.upm.edu.my/id/eprint/18187 |
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| Summary: | Variable traffic vibration loads on overcrossing and bridges are the cause of
damages in essential load-bearing components could consequently lead to
damage or failure of the bridge. Nowadays, the fluid viscous dampers are the
most conventional energy dissipation system to implement in bridges. However,
the viscous dampers are the passive type control system and its function is the
same for an entire operation time of the device. Since the applied vibration in
the bridge is dependent on various traffic loads (heavy, medium, and low traffic),
it is required to change the function of the damper.
In this research, a Semi-active Bypass Viscous Damper is developed by utilizing
a pair of external fluid flow patches as bypass valves to the sides of the viscous
damper cylinder to flow the fluid from two chambers of the cylinder during the
movement of the piston. Two flow control valves have been implemented in the
device to control the flow pressure of the fluid passing through the bypass valve
during the functioning of the damper device. Therefore, the function of the
damper device is adjustable by changing the flow control valves positions within
a range upon the displacement of the structure.
The analytical model of the proposed bypass viscous damper is developed and
the performance of the device under different loading conditions has been
formulated according to the control valves position and fluid pressure inside the
cylinder. Then the finite volume model of the moving fluid inside the device has
been developed and the function of the device evaluated through Computational
Fluid Dynamics (CFD) analysis. |
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