Sage Journals: Discover world-class research

Abstract

The dynamic properties of Tuned Mass Dampers (TMD's) used to reduce the vibrations of footbridges are generally based on the optimization criterion of Den Hartog. However the spring, mass and damper of a TMD may possess slight fabrication tolerances or change its damping element properties due to temperature, which can result in a detuning of a TMD. The study presented deals with the influence of a detuning on the performance of a TMD. A simplified model for beam-like footbridges under pedestrian loading is proposed. It is shown that a 2-DOF-system in harmonic stationary motion represents a good approximation of the beam structure under transient time-dependent load. Graphs are given to assess the increase of acceleration and the decrease of effectiveness due to detuning. A case study on a footbridge with a span of 45 m demonstrates its accuracy.

Keywords

tuned mass damper TMD footbridges pedestrian bridges human-induces vibrations

Get full access to this article

View all access options for this article.

References

Bachmann

(1988). Schwingungsprobleme bei Fußgänger bauwerken, Bauingenieur 63, Springer, Berlin, Germany. (in German)

Butz

and Distl

(2008). Personen-Induzierte Schwingungen von Fußgängerbrücken, Stahlbau- Kalender 2008, Ernst&Sohn, Berlin, Germany. (in German)

Den Hartog

J.P.

(1984). Mechanical Vibrations, Dover Publications, New York, USA.

Eurocode 5 (2004). Design of Timber Structures – Part 2: Bridges, European Committee for Standardization, Brussels, Belgium.

Fritsche

(2011). Effektivität von Massendämpfern für Fußgängerbrücken bei transienter Belastung, Master Thesis, HTWG Konstanz. (in German)

Hamm

(2003). Ein Beitrag zum Schwingungs- und Dämpfungsverhalten von Fußgängerbrücken aus Holz, PhD Thesis, Technical University München. (in German)

HiVoSS-Projekt (2008). Guideline for the Design of Footbridges, RFS-CT-2007-00033, Human Induced Vibration of Steel Structures. (http://www.stb.rwth-aachen.de/projekte/2007/HIVOSS/download.php)

Jensen, H., Setareh, M. and Peek, R. (1992). “TMDs for vibration control of systems with uncertain properties”, Journal Structural Engineering, ASCE, Vol. 118, No. 12, pp. 3285–3296.

Kreuzinger

(2002). “Dynamic design strategies for pedestrian and wind actions”, Proceedings of the International Conference on the Design and Dynamic Behaviour of Footbridges, Paris, France, November.

10.

Petersen

(2001). Schwingungsdämpfer im Ingenieurbau, Maurer und Söhne GmbH, München, Germany.

11.

Schmelzer

Oberguggenberger

and Adam

(2010). “Efficiency of tuned mass dampers with uncertain parameters on the performance of structures under stochastic excitation”, Journal of Risk and Reliability, Vol. 224, No. 4, pp. 297–308.

12.

Zivanovic

Pavic

and Reynolds

(2005). “Vibration serviceability of footbridges under human-induced excitation: A literature review”, Journal of Sound and Vibration, Vol. 279, No. 1–2, pp. 1–74.

Effectiveness of “Detuned” TMD's for Beam-Like Footbridges

Abstract

Keywords

Get full access to this article

References