Structural Engineering and Mechanics

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Impact study for multi-girder bridge based on correlated road roughness

  • Liu, Chunhua (Department of Civil and Environmental Engineering, Florida Int'l University) ;
  • Wang, Ton-Lo (Department of Civil and Environmental Engineering, Florida Int'l University) ;
  • Huang, Dongzhou (Structural Research Center, Florida Department of Transportation)
  • Published : 2001.03.25
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Abstract

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.

Keywords

References

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