Development of a Bi-directional Multi-Passive Tuned Mass Damper
(English)In: Journal of Structural Engineering, ISSN 0733-9445Article in journal (Refereed) Submitted
This paper presents the development and testing of a bi-directional multi-passivetuned mass damper (bi-MTMD). A prototype of the damper has been built andtested under laboratory conditions. The damper was developed for application toa vertical hanger on an existing tied-arch railway bridge. During trainpassage, resonance has been observed in several hangers, resulting in areduction in the predicted fatigue service life. The objective of the damper isto mitigate the vibrations to reduce the resulting stresses and consequently toextend the life of the hanger. The hanger has different natural frequencies forlongitudinal and transversal bending. In addition, a significant difference innatural frequency is obtained for the loaded and unloaded bridge, due to theincrease in axial force in the hangers. The developed damper accounts for bothscenarios and is tuned based on previous field measurements. The results fromthe laboratory experiments are compared with a 3D FE-model of the damper.
Tuned mass damper, Bi-directional damper, experimental testing, frequency response function, railway bridge
IdentifiersURN: urn:nbn:se:kth:diva-120212OAI: oai:DiVA.org:kth-120212DiVA: diva2:613950
ProjectsLong Life Bridges
FunderEU, FP7, Seventh Framework Programme, 286276
QS 20132013-04-022013-04-022013-05-14Bibliographically approved