Awarie Budowlane 2015
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Bridges overloaded by heavy vehicles
Przeciążenie mostów od obciążenia wywołanego ciężkimi pojazdami |
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Andrzej S. Nowak,
nowak@auburn.edu
Department of Civil Engineering, Auburn University, Auburn, USA |
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Streszczenie |
The knowledge of the actual live load is important for a rational management of highway bridges.
The forms of damage due to live load include fatigue cracking, formation of pot-holes, excessive vibration and
deflection and in extreme cases even a catastrophic collapse. It has been observed that traffic load is strongly
site-specific. There are considerable differences in traffic volume and weight of trucks. Recently, a substantial
data base has been collected using Weigh-in-Motion (WIM) stations. The objective of this paper is to review
the available WIM data and assess the degree damage in highway bridges depending on traffic volume (ADTT)
and weight of heavy vehicles. The cumulative distribution function (CDF) of the gross vehicle weight (GVW)
is considered separately for different types of vehicles. The live load effects are calculated using influence lines
of moments and shear forces for a wide range of span length. The results are plotted on the probability paper
for an easier interpretation of the results. For the considered locations, the percentage of overloaded vehicles is
determined to facilitate a site-specific comparison. The present study confirmed that for each WIM location, it
is possible to pin-point which types of vehicles have a major contribution to bridge damage.
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Awarie Budowlane 2015
20 - 23 maja, 2015, Międzyzdroje