Dynamic Amplification Factors of Some City Bridges

Paper presents a study about dynamic effects obtained
from the dynamic load testing of the city highway bridges in Latvia
carried out from 2005 to 2012. 9 prestressed concrete bridges and 4
composite bridges were considered. 11 of 13 bridges were designed
according to the Eurocodes but two according to the previous
structural codes used in Latvia (SNIP 2.05.03-84). The dynamic
properties of the bridges were obtained by heavy vehicle passing the
bridge roadway with different driving speeds and with or without
even pavement. The obtained values of the Dynamic amplification
factor (DAF) and the bridge natural frequency were analyzed and
compared to the values of built-in traffic load models provided in
Eurocode 1. The actual DAF values for even bridge pavement in the
most cases are smaller than the value adopted in Eurocode 1. Vehicle
speed for uneven pavements significantly influence Dynamic
amplification factor values.

• I. Paeglite
• A. Paeglitis

• Bridge
• dynamic effects
• load testing
• dynamic amplification factor.

[1] Brady, S.P., O'Brien, J.O., Znidaric, A. (2006. gada March). Effect of
vehicle velocity on the dynamic amplification of a vehicle crossing a
simply supported bridge. Journal of Bridge Engineering, 11(2), 241-249.
doi:10.1061/(ASCE)1084-0702(2006)11:2(241)
[2] Bruls, A., Calgaro, J.A., Mathieu, H., Prat, M. (1996). ENV1991 – Part
3: The main models of traffic loads on bridges; background studies.
IABSE Colloquim, Delft, The (pp. 215-228). Delft: IABSE.
[3] Cantero, D., González, A., O'Brien, E.,J. (2009). Maximum dynamic
stress on bridges traversed by moving loads. Proceedings of the ICE -
Bridge Engineering, 162(BE2), 75-85.
doi:http://dx.doi.org/10.1680/BREN.2009.162.2.75
[4] Gonzalez, A., Znidaric, A., Casas J.R., Enright, B., O'Brien, E., Lavric,
I., Kalin, J. (2009). Recommendations on dynamic amplification
allowance ARCHES-22-DE10. Warzawa.
[5] Gonzįlez, A., Rattigan, P., O'Brien, E., J., Caprani, C., C. (2008).
Determination of bridge lifetime dynamic amplification factor using
finite element analysis of critical loading scenarios. Engineering
Structures, 30(9), 2330-2337.
doi:http://dx.doi.org/10.1016/j.engstruct.2008.01.017
[6] O'Brien, E.J., Rattigan, P., Gonzalez, A., Dowling, J., Znidaric, A.
(2009). Characteristic dynamic traffic load effects in bridges.
Engineering structures, 31, 1607-1612.
[7] Paeglite I, Paeglitis A, (2013) The Dynamic Amplification Factor of the
Bridges in Latvia. // Journal Procedia Engineering,2013, pp. 851-858.,
10.1016/j.proeng.2013.04.108
[8] Karoumi, R., Andersson, A. (2007). Load testing of the new Svinesund
Bridge. Stockholm: Royal Institute of Technology (KTH).