Bridge dynamics and loading

Colin C. Caprani, Dublin Institute of Technology
Eugene O'Brien
Arturo Gonzalez
Yingyan Li
Paraic Rattigan
Niall Harris

Document Type Conference Paper

Keynote paper, Third National Symposium on Bridge and Infrastructure Engineering in Ireland, eds N.A. Ni Nuallain, A. O'Connor and K. Gavin, Trinity College Dublin and University College Dublin, pp.347-358.


Recent UCD research on dynamic bridge-truck interaction and bridge traffic loading in general is reported. The accuracy of bridge traffic load assessment has been significantly improved by identifying the differences in the sources of traffic loading on short- to medium-span bridges and treating them separately. It is shown that results can be significantly improved by treating 1-,2-,3- and 4-truck loading events separately. Gaps between trucks are also identified as a critical issue that strongly influences the frequency of key3-and 4-truck events. Trends in the dynamics of traffic loading are identified using simple force models on simply supported beams. It is shown that an accurate assessment of the influence of dynamics requires a probabilistic approach. This is illustrated through an assessment of the dynamic factor for a bridge in Slovenia.