Serviceability Performance Analysis of Concrete Box Girder Bridges Under Traffic-Induced Vibrations by Structural Health Monitoring: A Case Study
- 91 Downloads
The perceptible vibration of concrete box girders under traffic loads is an important topic in existing bridges, on which vehicle movement often cause vibrations too strong from the viewpoints of travelers. In this paper, the results of an extensive program of full-scale ambient vibration tests involving a 380 m concrete box girder bridge, the Cannavino bridge in Italy, are presented. The human safety assessment procedure of the bridge includes ambient vibration testing, identification of modal parameters from ambient vibration data, comparison with a detailed finite element modeling as validation of experimental measurements, comparison of peak accelerations to reference values from technical standards/literature in order to estimate the vibration level, and evaluation of safety by the use of histograms. A total of nine modal frequencies are identified for the deck structure within the frequency range of 0–10 Hz. The results of the ambient vibration survey are compared to the modal frequencies computed by a detailed three-dimensional finite element model of the bridge, obtaining a very good agreement. It emerges that a linear finite element model appears to be capable of capturing the dynamic behavior of concrete box girder bridges with very good accuracy. For each direction, experimental peak accelerations are compared to acceptable human levels available in technical standards/literature, showing that traffic loads mainly induce a vertical component of vibration on the bridge deck. Finally, the elaboration of histograms allows to assess that the bridge is exposed to clearly perceptible vertical vibrations, requiring the adoption of suitable vibration reduction devices.
KeywordsConcrete box girder bridge Traffic load Ambient vibration testing Dynamic identification Structural vibration Acceptable human levels
This work is framed within the research project “DPC/ReLUIS, RS 4 - Osservatorio sismico delle strutture & monitoraggio” and within the COST Action “Quality Specifications for Roadway Bridges, Standardization at a European Level”, Action number TU1406.
- 11.Colapietro D, Fiore A, Netti A, Fatiguso F, Marano GC, De Fino M, Cascella D, Ancona A (2013) Dynamic identification and evaluation of the seismic safety of a masonry bell tower in the south of Italy. In COMPDYN 2013–4th ECCOMAS thematic conference on computational methods in structural dynamics and earthquake engineering, Kos Island, Greece, 12–14 June 2013Google Scholar
- 13.Altunişik AC, Bayraktar A, Sevim B (2012) Operational modal analysis of a scaled bridge model using EFDD and SSI methods. Indian J Eng Mater Sci 19:320–330Google Scholar
- 20.Mallock HRA (1902) Vibrations produced by the working of traffic on the Central London Railway. Board of Trade Report, Command PapersGoogle Scholar
- 21.Smith JW (1988) Vibration of structures, application in civil engineering design. Chapman and Hall, Boca RatonGoogle Scholar
- 23.European Committee for Standardization (2002) Eurocode 2002. Basis of Structural Design—prAnnex A2. EN1990. European Committee for Standardization, BrusselsGoogle Scholar
- 24.International Standards ISO 2631/2-1989 (E) (1989) International organization for standards. Evaluation of human exposure to whole-body vibration—part 2: continuous and shock induced vibration in buildings (1–80 Hz). International Standards ISO 2631/2-1989 (E), GenevaGoogle Scholar
- 25.Ministerio de Fomento Direcció n General de Carreteras (1999) Recomendaciones para la realización de pruebas de carga de recepción én puentes de carreteraGoogle Scholar