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Structural Engineering and Mechanics Volume 11, Number 3, March 2001 , pages 259-272 DOI: https://doi.org/10.12989/sem.2001.11.3.259 |
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Impact study for multi-girder bridge based on correlated road roughness |
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Chunhua Liu, Ton-Lo Wang and Dongzhou Huang(U.S.A.)
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| Abstract | ||
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The impact behavior of a multigirder concrete bridge under single and multiple moving vehicles is studied based on correlated road surface characteristics. The bridge structure is modeled as grillage beam system. A 3D nonlinear vehicle model with eleven degrees of freedom is utilized according to the HS20-44 truck design loading in the American Association of State Highway and Transportation Officials (AASHTO) specifications. A triangle correlation model is introduced to generate four classes of longitudinal road surface roughness as multi-correlated random processes along deck transverse direction. On the basis of a correlation length of approximately half the bridge width, the upper limits of impact factors obtained under confidence level of 95 percent and side-by-side three-truck loading provide probability-based evidence for the evaluation of AASHTO specifications. The analytical results indicate that a better transverse correlation among road surface roughness generally leads to slightly higher impact factors. Suggestions are made for the routine maintenance of this type of highway bridges. | ||
| Key Words | ||
| highway bridge; road surface roughness; correlation analysis; dynamic analysis; impact study. | ||
| Address | ||
| Chunhua Liu and Ton-Lo Wang, Department of Civil and Environmental Engineering, Florida Int | ||