> For the complete documentation index, see [llms.txt](https://docs.openbrim.org/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.openbrim.org/examples/concrete-bridge-examples/example-prestressed-i-girder-concrete-bridge-ex1-pig.md). # Prestressed I Girder Bridge This example demonstrates how to model, analyze, and design a Prestressed I Girder Concrete Bridge using OpenBrIM.App. ![Prestressed I Girder Bridge Model](https://openbrim.atlassian.net/wiki/download/attachments/2101706864/ws-guide-prestressedigirder-20230703-121430.png?api=v2) {% hint style="success" %} **Ready to start?** Access the completed example in **New Project > Example Projects**, or follow this step-by-step guide to build from scratch. {% endhint %} ![Example Projects](https://openbrim.atlassian.net/wiki/download/attachments/2101706864/image-20230710-162629.png?api=v2) ![Prestressed I Girder Example](https://openbrim.atlassian.net/wiki/download/attachments/2101706864/image-20230710-162657.png?api=v2) ## Capabilities ### 3D Modeling * Generate parametric 3D model with substructure and superstructure * Export to DGN/DXF/IFC formats ### Finite Element Analysis * Parametric FEA model generation * Time-dependent staged construction analysis * Influence surface-based live load analysis * Creep and shrinkage per CEB-FIP 1990 ### Loading * Wind load on structure (AASHTO) with automatic nodal load calculation * Wind load on live load * HL-93, Legal Trucks, Permit Trucks (custom trucks supported) * Temperature loads * Surface/Line/Point loads * Tendon stressing for superstructure and substructure ### Staged Construction * Deck pouring sequence (transverse and longitudinal) * Deconstruction for rehabilitation projects * Temporary support management * Non-composite and composite state modeling * Short-term and long-term modulus of elasticity ### Analysis Results * Stage-by-stage results (incremental and cumulative) * Deflection visualization and spreadsheet export * Combination results for all limit states * Composite section results * Stress distributions * Critical vehicle location visualization ### Design Components supported per AASHTO 9th Edition: * Prestressed I Girder * Cross Frames * Pier Caps, Columns, Footings * Piles, Drilled Shafts ### Export & Reports * Export to LARSA 4D, CSI Bridge, Midas * Quantity Report * Seat/Slab Elevation Tables * Project Inputs * Vertical Clearance Report * 2D Drawings (DGN/DXF export) ## Workflow Steps Follow these sections to complete the bridge design: | Step | Section | Description | | ---- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | ------------------------------------------- | | 1 | [Modeling on OpenBrIM.App](/examples/concrete-bridge-examples/example-prestressed-i-girder-concrete-bridge-ex1-pig/modeling-on-openbrimapp-ex1-pig.md) | Create new project | | 2 | [Bridge Geometry](/examples/concrete-bridge-examples/example-prestressed-i-girder-concrete-bridge-ex1-pig/bridge-geometry-ex1-pig.md) | Define alignment, supports, girder layout | | 3 | [Properties](/examples/concrete-bridge-examples/example-prestressed-i-girder-concrete-bridge-ex1-pig/properties-ex1-pig.md) | Define materials, rebars, sections, strands | | 4 | [Superstructure](/examples/concrete-bridge-examples/example-prestressed-i-girder-concrete-bridge-ex1-pig/superstructure-ex1-pig.md) | Model girders, deck, diaphragms, bearings | | 5 | [Superstructure Attachments](/examples/concrete-bridge-examples/example-prestressed-i-girder-concrete-bridge-ex1-pig/superstructure-attachments-ex1-pig.md) | Add barriers, roadway | | 6 | [Substructure](/examples/concrete-bridge-examples/example-prestressed-i-girder-concrete-bridge-ex1-pig/substructure-ex1-pig.md) | Model piers, foundations, piles | | 7 | [Construction](https://github.com/openbrim/platform/blob/master/docs/examples/example-prestressed-i-girder-concrete-bridge-ex1-pig/construction-ex1-pig/construction-stage-ex1-pig.md) | Define construction stages | | 8 | [Loading](/examples/concrete-bridge-examples/example-prestressed-i-girder-concrete-bridge-ex1-pig/loading-ex1-pig.md) | Apply all load types | | 9 | [Combinations](https://github.com/openbrim/platform/blob/master/docs/examples/example-prestressed-i-girder-concrete-bridge-ex1-pig/combinations-ex1-pig/result-extraction-cases-ex1-pig.md) | Set up load combinations | | 10 | [Templates](/examples/concrete-bridge-examples/example-prestressed-i-girder-concrete-bridge-ex1-pig/templates-for-code-check-and-load-rating-ex1-pig.md) | Configure code check templates | | 11 | [Superstructure Code Checks](https://github.com/openbrim/platform/blob/master/docs/examples/example-prestressed-i-girder-concrete-bridge-ex1-pig/superstructure-code-checks-ex1-pig/prestressed-i-girder-code-check-ex1-pig.md) | Run girder design checks | | 12 | [Substructure Code Checks](https://github.com/openbrim/platform/blob/master/docs/examples/example-prestressed-i-girder-concrete-bridge-ex1-pig/substructure-code-checks-ex1-pig/pier-cap-code-check-ex1-pig.md) | Run substructure design checks | | 13 | [Analyze and Design](/examples/concrete-bridge-examples/example-prestressed-i-girder-concrete-bridge-ex1-pig/analyze-and-design-ex1-pig.md) | Run analysis and review results | {% hint style="info" %} Whenever you modify a bridge component parameter or alignment, all associated results and reports will automatically update. This demonstrates the power of parametric bridge engineering in OpenBrIM. {% endhint %} --- # Agent Instructions This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com. ## Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation by asking a question. Perform an HTTP GET request on the following URL with the `ask` and `goal` query parameters: ``` GET https://docs.openbrim.org/examples/concrete-bridge-examples/example-prestressed-i-girder-concrete-bridge-ex1-pig.md?ask=&goal= ``` `ask` is the immediate question: it should be specific, self-contained, and written in natural language. `goal` is what the user is ultimately trying to achieve, the reason they need the answer. Sharing it helps GitBook give you a better, more relevant answer. A goal is most helpful when it describes the outcome the user wants rather than restating the question. For example, with `ask=how do I create an API token`, a goal like `automate deployments from our CI pipeline` lets GitBook tailor the answer to that use case. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.