Seismic Design of Non-Conventional Bridges (2019) / Chapter Skim
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Pages 12-20
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12 Project-Specific Seismic Design Criteria Respondents were able to provide specific criteria documents for new designs. The collection of project-specific design criteria was the most definitive source for discerning the current standard of practice for seismic design of non-conventional bridges.
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State of Practice Based on Project Criteria 13 Two-level performance criteria: SEE (2,500-year) and FEE (100-year)
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14 Seismic Design of Non-Conventional Bridges Project 4. Gerald Desmond Bridge Replacement Project (California)
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State of Practice Based on Project Criteria 15 Two-level performance criteria: SEE (∼1,500-year return) and FEE (∼450-year return)
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16 Seismic Design of Non-Conventional Bridges Review of Criteria Documents A review of the entire set of criteria documents provides the common elements of the state of practice in the seismic design of non-conventional bridges. While there are a few variations on the basic practices, the criteria identify the following basic elements of current engineering practice for non-conventional bridges: 1.
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State of Practice Based on Project Criteria 17 into the performance measures, and may control design requirements. However, application of a demand displacement-based capacity check eliminates the conflict that otherwise can occur with the single limit-state criterion.
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18 Seismic Design of Non-Conventional Bridges define the transition between the two states and the post-liquefied strength state remain a subject for continued research. The general practice today is to bracket the liquefied and non-liquefied conditions when assessing compliance with performance criteria.
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State of Practice Based on Project Criteria 19 performed on a number of the major non-conventional bridges covered in the criteria reviewed in this section. Accounting for this level of behavior is needed for those criteria that are based on explicit strain limits.
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20 Seismic Design of Non-Conventional Bridges as inelastic or pseudo-elastic elements of the structural system to satisfy the repairable damage (or other) limit state assigned to the structure.
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