Development of guidelines for incorporation of vertical ground motion effects in seismic design of highway bridges.
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Development of guidelines for incorporation of vertical ground motion effects in seismic design of highway bridges.

Filetype[PDF-2.72 MB]


English
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  • Creators:
  • Corporate Creators:
    University of California, Davis. Department of Civil and Environmental Engineering
  • Subject/TRT Terms:
  • Publication/ Report Number:
    CA/UCD-SESM-08-01
  • Resource Type:
    Tech Report
  • Geographical Coverage:
    California
  • Corporate Publisher:
    California. Dept. of Transportation. Division of Research and Innovation
  • Abstract:
    This study was undertaken with the objective of assessing the current provisions in SDC-2006 for incorporating

    vertical effects of ground motions in seismic evaluation and design of ordinary highway bridges. A

    comprehensive series of simulations was carried out on a range of typical bridge configurations to isolate the

    effects of vertical motions. Results of these analyses reveal that vertical ground motions can have a significant

    effect on (i) the axial force demand in columns; (ii) moment demands at the face of the bent cap, and (iii)

    moment demands at the middle of the span. The first two issues are found to be less of a concern in the present

    study since the axial capacity of the columns and the moment capacity of the girders at the face of the bent cap

    are generally adequate to resist the increase in the respective demands due to vertical effects. On the other

    hand, the amplification of negative moments in the mid-span section is identified as the primary issue that should

    be addressed in the context of existing seismic guidelines in SDC-2006. In particular, the current requirement

    that vertical ground motions be considered only for sites where the expected peak rock acceleration is at least

    0.6g is not an adequate basis to assess the significance of vertical effects. A second SDC criterion that is in

    need of reexamination is the design specification for the consideration of vertical effects by means of a static

    load equivalent to 25% of the dead load applied in the upward and downward directions. The reinforcement

    resulting from this requirement is found to be inadequate for a significant number of cases examined in this

    study. It is also shown that an elastic response spectrum analysis is an effective tool to determine the effects of

    vertical ground motions on the bridge superstructures. A set of vertical design spectra and a simplified design

    procedure that uses the proposed elastic spectra were developed.

  • Format:
    PDF
  • Funding:
    59A0434
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