Why So Many Sizes and Shapes? - Caltrans · Bridge layout, spans, architectural features, right of...
Transcript of Why So Many Sizes and Shapes? - Caltrans · Bridge layout, spans, architectural features, right of...
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Why So Many Sizes and Shapes?
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Bridge layout, spans, architectural features, right of way and column bent location.
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Span length determines structure depth and column axial forces, from which column size follows. Column design is highly constrained.
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Bridge Design and Analysis
Seismic Design Criteria (SDC) requires columns to be ductile and to dissipate energy during a seismic event by plastic hinging.
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Columns are designed in accordance with: AASHTO LRFD Bridge Design Specifications (LRFD-BDS) Caltrans Amendments to LRFD-BDS Caltrans Seismic Design Criteria (SDC) Research and Testing
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Column lengths, cross section, and reinforcement ratios are modified to adjust the fundamental period of vibrations and stiffness of the structure per the Seismic Design Criteria (SDC).
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It is Caltrans Policy to Standardize Columns. Bridge Design Details Manual (BDD) lists 3 column sizes
only: 4’, 5’-6”, 7’. Column sizes should be in 6” increments.
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Steel Column Forms
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Steel Column Forms
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Steel Column Forms (Flared)
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Wood Column Forms
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Local stake holder’s demand infrastructures projects that enhance the local environment.
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Community Signature…(Weaved Basket)
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Outrigger Bents
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Existing Bridge (Standard?)
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Proposed New Replacement (Stunning?)
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Caltrans Standard Bridge Column Flare
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Caltrans Standard Bridge Column Flare
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Flared Top Columns
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Architectural Treatment
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Architectural Treatment
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Bridge Columns (Non-Standard)
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Aesthetics Local Agency Involvement
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Caltrans’ designers do have standard column sizes and
shapes.
Seismic Design Criteria, AASHTO-LRFD, and Bridge Site Considerations dictate minor column modifications.
Local Agencies provide funding for most bridge structures and choose the design engineer for their projects (mostly a private Consultant not Caltrans).
Locals want “Signature Projects” to make their communities unique and their requests can not be ignored.
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