Retrofit of existing railway bridges of short to medium spans for high-speed traffic using viscoelastic dampers
This paper presents a study on the energy-absorbing capacities of viscoelastic dampers (VEDs) for reducing the resonant vibrations of simply supported high-speed railway bridges of short to medium span. The proposed solution is based on retrofitting the bridge with a set of discrete VEDs connected t...
| Authors: | , , |
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| Format: | article |
| Publication Date: | 2012 |
| Country: | España |
| Institution: | Universitat Politècnica de València (UPV) |
| Repository: | RiuNet. Repositorio Institucional de la Universitat Politécnica de Valéncia |
| Language: | Spanish |
| OAI Identifier: | oai:riunet.upv.es:10251/46178 |
| Online Access: | https://riunet.upv.es/handle/10251/46178 |
| Access Level: | Open access |
| Keyword: | Ballast deconsolidation Fractional derivative High-speed railway bridges Passive vibration control Resonance Viscoelastic dampers De-consolidation Fractional derivatives High-speed railways Auxiliary equipment Damping Dynamic response Railroad engineering Retrofitting Railroad bridges Bridge construction Dynamic analysis Numerical model Railway construction Seismic retrofit Structural analysis Structural response Vibration Viscoelasticity MECANICA DE LOS MEDIOS CONTINUOS Y TEORIA DE ESTRUCTURAS |
| Summary: | This paper presents a study on the energy-absorbing capacities of viscoelastic dampers (VEDs) for reducing the resonant vibrations of simply supported high-speed railway bridges of short to medium span. The proposed solution is based on retrofitting the bridge with a set of discrete VEDs connected to the slab and to an auxiliary structure, placed underneath the bridge deck and resting on the abutments. In this investigation attention is focused on mitigating flexural vibrations; therefore, both the bridge and the auxiliary structure are modelled as simply supported beams with Bernoulli-Euler (B-E) behavior, whereas a discrete fractional derivative model simulates the behavior of the damping material. Firstly, a parametric study of this planar model is carried out, which has led to a dimensioning procedure of the dissipative system. The technical feasibility of this particular retrofit design is numerically evaluated by applying it to a numerical model of a simply supported railway bridge with inadmissible vertical accelerations. Numerical results show that the dynamic response of the structure can be significantly reduced in resonance with the proposed damping system. © 2012 Elsevier Ltd. |
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