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Keywords: vehicle, bridge, dynamics, shear, expansion joint, highway.

Summary

This paper addresses the need of exploring the dynamics associated with the shear load effect on short- and medium-span bridges for traversing traffic, with special attention at damaged expansion joints. It is not rare to have a significant discontinuity at this location. Any step on the road surface influences the vehicle dynamics and subsequently the bridge response as well.

The influence of shear dynamic amplification factor (DAF) values has been investigated by direct comparison of two vehicle configurations: a typical five-axle truck and a crane truck. The main difference between both vehicles is the presence of a hinge in the articulated truck allowing it to be more flexible than the crane. A numerical vehicle-bridge interaction (VBI) model was develop for Euler-Bernoulli beams, that accounts for profile roughness obtained from an stochastic process, and various bump shapes representing the damaged joint discontinuity. Using the described model within a Monte Carlo simulation scheme, a sensitivity study has been carried out for many possible bridge spans, speeds, vehicle characteristics, severity of damaged expansion joints and profile roughness. In addition, multiple vehicle meeting scenarios have been thoroughly studied for many possible traffic situations.

The results clearly show that the highest shear DAF values occur on shorter spans and that they are directly related to the damage severity of the expansion joint. Furthermore, massive rigid vehicles with a lot of axles like cranes, that could govern the assessment of a bridge, are less influenced by large road discontinuities prior to the bridge and tend to produce significantly smaller dynamic increments in shear than five-axle trucks. Overall, the higher the static load effect, the smaller the dynamic amplification factor for shear forces at supports.

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Front Page Browse CCP CSETS CTR IJRT Other Authors Search Purchase Guide FAQ Contact us	Civil-Comp Proceedings ISSN 1759-3433 CCP: 91 PROCEEDINGS OF THE TWELFTH INTERNATIONAL CONFERENCE ON CIVIL, STRUCTURAL AND ENVIRONMENTAL ENGINEERING COMPUTING Edited by: B.H.V. Topping, L.F. Costa Neves and R.C. Barros Paper 83 The Impact of a Bump on the Response of a Bridge to Traffic A. González, D. Cantero and E.J. OBrien School of Architecture, Landscape and Civil Engineering, University College Dublin, Ireland doi:10.4203/ccp.91.83 purchase the full-text of this paper Full Bibliographic Reference for this paper , "The Impact of a Bump on the Response of a Bridge to Traffic", in B.H.V. Topping, L.F. Costa Neves, R.C. Barros, (Editors), "Proceedings of the Twelfth International Conference on Civil, Structural and Environmental Engineering Computing", Civil-Comp Press, Stirlingshire, UK, Paper 83, 2009. doi:10.4203/ccp.91.83 Keywords: vehicle, bridge, dynamics, shear, expansion joint, highway. Summary This paper addresses the need of exploring the dynamics associated with the shear load effect on short- and medium-span bridges for traversing traffic, with special attention at damaged expansion joints. It is not rare to have a significant discontinuity at this location. Any step on the road surface influences the vehicle dynamics and subsequently the bridge response as well. The influence of shear dynamic amplification factor (DAF) values has been investigated by direct comparison of two vehicle configurations: a typical five-axle truck and a crane truck. The main difference between both vehicles is the presence of a hinge in the articulated truck allowing it to be more flexible than the crane. A numerical vehicle-bridge interaction (VBI) model was develop for Euler-Bernoulli beams, that accounts for profile roughness obtained from an stochastic process, and various bump shapes representing the damaged joint discontinuity. Using the described model within a Monte Carlo simulation scheme, a sensitivity study has been carried out for many possible bridge spans, speeds, vehicle characteristics, severity of damaged expansion joints and profile roughness. In addition, multiple vehicle meeting scenarios have been thoroughly studied for many possible traffic situations. The results clearly show that the highest shear DAF values occur on shorter spans and that they are directly related to the damage severity of the expansion joint. Furthermore, massive rigid vehicles with a lot of axles like cranes, that could govern the assessment of a bridge, are less influenced by large road discontinuities prior to the bridge and tend to produce significantly smaller dynamic increments in shear than five-axle trucks. Overall, the higher the static load effect, the smaller the dynamic amplification factor for shear forces at supports. purchase the full-text of this paper (price £20) go to the previous paper go to the next paper return to the table of contents return to the book description purchase this book (price £140 +P&P)
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