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Influence of heavy trucks on highway bridges
| 题名： | Influence of heavy trucks on highway bridges |
| 作者： | Ton-Lo Wang and Chunhua Liu |
| 关键词： | Bridges, Highway Truck, Fatigue, Impact, Dynamic Response, Road Surface Roughness, Simply Supported Beam |
| 摘要： | In the present study, track traffic data collected by Florida Department of Transportation (FOOT) statistics office are grouped into according to their types and loading condition (loaded or empty). Mean values of track axle weight and spacing are used to represent their average effects on bridge structures. The mathematical models of typical tracks with significant counts are established and the input data are derived from the synthesized results. These typical tracks include types 5,8,9, and 10. Road surface roughness is generated as multi-correlated random processes. According to the research by Honda et al., die coefficient of correlation is approximately taken as a constant Static effects of the heavy tracks are compared with those of the standard design truck HS20-44. The tandem axle weights of the heavy tracks are found to be higher than that of HS20-44 and exceed the limit by AASHTO Guide. Dynamic imp^ factors of moment at midspan and shear at end are analyzed for I-girder steel and prestressed concrete bridges ranging from 9.14m (30ft) to 42.67m (140ft). Effects of correlation of road surface lousiness on dynamic impact factors are investigated. Fatigue accumulation damage incurred by the normal traffic at sites with significant counts is performed. |
| 报告类型： | 科技报告 |
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