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Model sketch

CSI recommends that users sketch bridge configuration and data that is to be entered into the bridge modeler. Sketching should aid in computational-model development. Also, sketches submitted to CSI Technical Support will better communicate design intention, and expedite the support process. Attached is a sample sketch (pdf). It is advised that sketches contain the following information:

  • Deck cross section: type, dimensioned geometry, total depth
  • Bearings: bearing property at each location, direction of unrestrained movement, girder support condition
  • Substructure: elevations for top of deck, bottom of girder, bottom of bearing, top of seat

Depending on bridge type, additional information may include:

  • Baseline elevation for top of deck at each substructure assembly
  • Bents: dimensioned geometry, column and cap-beam section properties

Dead-load verification

  • Bridge-deck-section area couples with base-material weight for dead-load computation. This should be taken into account when bridge deck and girders use concretes of different weight.
  • Haunch weight is not included, since haunch is only used to vertically offset girders. When tendons are modeled as elements, Tendon weight is included.
  • Shear forces reported on the Bridge Object Response Display form do not include tendon contribution since the primary tendon force is removed from flexural check.