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Division of Engineering Services Research On-Call Agreement #34652. Task #6, Noise Barrier Foundation Design

File Language:
English


Details

  • Creators:
    Narsavage, Peter ORCID ICON IMG
  • Corporate Creators:
    E.L. Robinson Engineering of Ohio Company
  • Corporate Contributors:
  • Subject/TRT Terms:
  • Publication/ Report Number:
    FHWA/OH-2022-19
  • Resource Type:
    Tech Report
  • Geographical Coverage:
    Ohio;United States
  • Corporate Publisher:
    Ohio. Department of Transportation
  • Abstract:
    The Ohio Department of Transportation (ODOT) wishes to develop a design method for drilled shaft foundations of noise barriers, using the software program LPILE. To accomplish this task, the research team performed the following activities: 1) Determine appropriate design loads and design criteria, 2) Review and evaluate soil strength correlations for incorporation into the design method, 3) Develop the proposed design method, and 4) Compare the proposed design method to existing ODOT design tables. Using wind loads from the AASHTO LRFD Bridge Design Specifications (AASHTO, 2020), the p-y method of analysis for laterally loaded piles was used to determine the drilled shaft length for all the different cases that are included in the current noise barrier foundation design tables in the Bridge Design Manual (ODOT, 2022a). The comparison of results to the existing design tables generally found very good agreement for granular soils. In the majority of cases the difference is only 0.5 foot. However, for the cohesive soils, there are some significant differences. For soft cohesive soils with N=0-1 the existing design table appears to be unconservative when compared to the results from the current study. In some cases, the drilled shaft lengths should be increased by up to 3 feet. While for stiffer cohesive soils the existing design table is much more conservative than the results from the current study. Also considered was the effect that varying the axial load and the addition of ice loads had on the shear, moment, and percent deflection for a noise barrier foundation located in a granular soil with N=10-19 and the maximum panel spacing (24 ft) and barrier height (20 ft). The increase in axial load slightly increases the shear and moment in the foundation. The small moment created by the off-center ice loads does not have a significant effect on the shear and moment in the noise barrier foundation. The addition of ice load does show an increase in the percent deflection of the noise barrier. The proposed design method may also be used to design a noise barrier foundation that falls outside the limits of the design tables in the ODOT Bridge Design Manual. The proposed design method has been adapted for this purpose and described in a white paper. The white paper describes the loading, design procedure, and the method of interpreting the results. It is intended for ODOT design consultants to use when the standard design tables do not apply.
  • Format:
    PDF
  • Funding:
    State Job No. 34652
  • Collection(s):
  • Main Document Checksum:
    urn:sha-512:ecdcab3a91b267b705d406e8057497cbf46599cc979ed9d3097313aad4def3af97d61b6e3bb6de8527537a74ab9f77cf5f69d1b41c3efdb11e2d07334afcbc12
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  • File Type:
    Filetype[PDF - 1.27 MB ]
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