Evaluation of Tapered Bridge Bearing Pads [Summary]
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Evaluation of Tapered Bridge Bearing Pads [Summary]

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English
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  • Creators:
  • Corporate Creators:
    University of South Florida
  • Corporate Contributors:
    Florida. Department of Transportation
  • Subject/TRT Terms:
  • Publication/ Report Number:
    BDV31-977-95
  • Resource Type:
    Brief
  • Geographical Coverage:
    United States
  • Edition:
    Summary
  • Corporate Publisher:
    Florida. Department of Transportation
  • Abstract:
    University of Florida researchers conducted experiments to evaluate tapered bearing pads for use in Florida bridge construction. The researchers found limited research on important design properties of tapered bearing pads such as axial stiffness, shear stiffness, horizontal restraining force and displacement generated in tapered pads under pure compression, and shear strain at slip. To evaluate these properties, they developed tapered pads with varying overall dimensions, elastomer thicknesses, and slope angles by modifying elastomer thicknesses and shim orientations of standard FDOT flat pads. Unaltered flat pads served as controls. Experiments showed that shear stiffness was not significantly influenced by taper angle or the direction of shear along the length of pads, remaining within 15% of flat pads. However, axial stiffness, horizontal restraining force, and horizontal displacement in tapered pads were found to depend on the taper slope angle. As taper slope increased, axial stiffness decreased, and horizontal restraining force and displacement increased. Based on these data, equations were developed to estimate axial stiffness, shear stiffness, horizontal restraining force, and horizontal displacement. The effect of taper slope on shear strain at pad slip was also investigated. Tapered pads placed against concrete surfaces satisfied the AASHTO requirement of minimum 0.5 shear strain before slip, but tapered pads placed against steel surfaces generally did not. The researchers proposed further work to evaluate options to prevent premature slip of tapered pads on steel surfaces. The equations developed in this project could be useful in those studies.
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