3D Bridge Design at NYSDOT The State of the Practice

Transcription

1 3D Bridge Design at NYSDOT The State of the Practice Presenter: Stephanie Winkelhake, PE NYSDOT, Office of Structures AASHTO Bridge Meeting T-19 Software and Technology Committee April 20, 2015 Saratoga Springs, NY

2 Objectives Brief overview of how Model Driven Bridge Design got started at NYSDOT. Present the basic elements of the Model Driven Bridge Design method. Present the basic elements of the Bridge Model Management.

3 Bentley SELECT series 2 MicroStation V8i InRoads V8i ProjectWise V8i

4 Milestones in 3D Development in NY 3D CADD models of substructures were first utilized for production work in 2003 Early adopters had their own methods to create, manage and utilize models. The first standards for using 3D CADD models was added to the Bridge Manual in Model Driven Bridge Design became a requirement for all new and replacement bridge projects in 2010.

5 Bridge Design Models 101 CADD Design models (sometimes call Feature Models) are graphics that represent bridge components or other design elements. Design models are always - True-scale and geospatial. - The single source of critical geometric data that supplies bridge geometry to downstream tasks and work groups.

6 Bridge Models as Graphic Features Models are graphic elements, or features in the CADD file, such as solids, shapes or lines. Feature models are non-data based Data based models such as.dtm or.alg files used in highway design are compatible but inconsistent with feature models used for bridge design.

7 Model Driven Bridge Design Site features, existing structures and proposed highway design are modeled during site data collection. A simple model for proposed bridge work is created during Preliminary Bridge Design. Refinement of geometric design is done by viewing/evaluating models concurrently. As the design concept evolves through Preliminary and into Final Design, the models are frequently revised to reflect the progression in design.

8 Model Driven Bridge Design During design, the aggregate of design models represent designer intent regarding bridge geometry. Design models are not integrated with or used for structural design. Design models are used for geometry dependant design and detailing tasks.

9 Model Driven Bridge Design Develop Contract Plans directly form models Quantity Estimating by design model measurement. Precisely Communicate within the design team

10 Model Driven Bridge Design By referencing several design models into a work file, designers can view different elements of the project s design concurrently. This enable designer to Determine geometric requirements of bridge elements. Verify compatibility with highway design and site features. Visualize alternatives. Perform conflict detection.

11 Transfer to Construction Contractors are provided all electronic engineering data residing in the Projectwise job folder as supplemental information. Many Contractors are now using this information to facilitate construction.

12 2D or not 2D - that is the question NYSDOT requires that substructures for all new and replacement bridge projects be modeled in 3D. For all other elements this decision is left to the designer. It is recommended that elements that are detailed in section and paid for by volume be modeled in 3D. Earthwork items are always detailed in section and are largely paid for by volume. Therefore, bridge earthwork item should be modeled in 3D.

13 2D Bridge Models Beams Joints Scuppers Lighting Diaphragms Bearings Barrier Slabs Railing Curbs Slope Protection/ Channel Lining Bar reinforcement

14 3D Bridge Models All Substructures. Earth structures such as MSES and GRES walls. Structure backfills such as under drain filter and Select Structure Fill.

15 3D Bridge Models Excavations for both proposed structures and excavations needed for the removal of existing structures. Solids vs. Surfaces both have advantages and disadvantages. Excavation protection such as steel sheet piling, soldier pile and lagging, or soil nailed wall.

16 MicroStation Model Space All design models are stored in a named Model Space. A Model Space is a sub-file within a MicroStation file used to compartmentalize the file. This has the benefit of allowing the designer to customize Naming of the project models

17 Bridge Model Management Bridge Model Management is the statewide standard practice for organizing, storing, sharing and using CADD work for all NYSDOT bridge projects. Developed to facilitate Model Driven Bridge Design. Documented in NYSDOT Bridge Manual. Requires some training.

18 CADD File Types All CADD files for Bridge Work is grouped into 5 types 1. Bridge Design File 2. Bridge Front File 3. Personal Work files 4. Bridge Drawing files 5. Bridge Estimate File

19 Bridge Design File Contains all modeled, location-critical components of the bridge design for which the bridge designer is principally responsible.

20 Bridge Design File Model Space List The Review Model, named [ ] REVIEW, is an empty model space with all the bridge design models referenced to it.

21 Bridge Front File Contains all graphical information that is not the result of the bridge design effort or is not at the correct coordinates.

22 Bridge Front File Model Space List Most models spaces are created early on in design because most of the needed information comes from the Site Data Package. This up-front work can then be referenced into other files as needed later.

23 Personal Work Files Contains designers project related work. These files can be used for anything. But are never part of the finalized work

24 Personal Work File Model Space List Models spaces can be used to develop ideas, check for conflicts, store alternatives not selected, cutting cross sections, creating surfaces or developing alignments.

25 Bridge Drawing Files Contains a single drawing to be included in the contract documents. References the appropriate individual models from the Bridge Design File and The Bridge Front File to show proposed bridge work.

26 Drawing File - Model Space List Models from the Bridge Design File and the Bridge Front File are referenced into the Plot model space. In some cases it is necessary to move or scale these reference files to efficiently layout the drawing.

27 Bridge Estimate File Contains empty model spaces with references to the design models needed to estimate the item. This provides a single centralized location for all quantity estimates done using Bridge Model Measurement

28 Estimate File - Model Space List Quantity estimates are obtained directly by measuring the design models used to produce the contract plans.