COSS-APP

COSS-APP | Cantilever Overhead Sign Structure Application

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Intuitive Graphic User Interface

Our user interface was created to be easy to use. Whether you’re creating complex cantilever overhead tri-chord or quad-chord truss type structures, or tubular (monotubes), COSS-APP has you covered.

Robust Analysis and Design

COSS-APP features allow you to rapidly create your cantilever overhead sign structure (COSS) analytical models using a wide range of options within a friendly user interface. Easily define your parameters and COSS-APP will setup the model for you in Bentley STAAD.Pro® CONNECT Edition or MIDAS CIVIL NX®, leveraging both platforms’ advanced analysis capabilities.

The features included in COSS-APP are the following:

Truss and arm geometry
- Tri-chord truss
- Quad-chord truss
- Tubular
- Dual-chord truss
Material and sectional properties
Type of connection (pinned or rigid)
Type of attachment
- Sign Panels
- Dynamic Message Sign or Variable Message Sign panels
- Catwalk (walkway)
- Other general attachments
AASHTO type loads:
- Permanent Loads
- Wind Loads
- Natural Wind Loads
- Truck-Induced Gust Loads
- Ice Loads
- Wind on Ice Loads
AASHTO type load combinations
Special feature:
- Wind-shielding and shading effects due to attachments
- Fatigue loads
Industry Standards:
Methodology:
- Load Resistance Factor Design (LRFD)

Comprehensive Model Results

Create models with both graphical and numerical results including robust detailed inputted parameters, giving you and your colleagues full confidence in your design.

Interoperability

COSS-APP integrates with STAAD.Pro’s and MIDAS CIVIL NX® interoperability technology, allowing end-users to access more advanced features, and work collaboratively and collectively thorough the project’s lifecycle.

COSS-APP works with Bentley applications, such as RAM Connection, STAAD.Pro, STAAD Foundation, Adina and iTwin Analytical Synchronizer

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COSS-APP is built to address non-standard, complex tri-chord and quad-chord truss type cantilever sign structures.

COSS-APP Graphic User Interface (GUI) & Features

Designing cantilever overhead sign structures can consume weeks or even months. COSS-APP produces the analytical model in minutes.

COSS-APP Efficiently Design Cantilever Overhead Sign Structures

For engineers tasked with the design of highway structural supports, COSS-APP builds the analytical models for cantilever overhead sign structures in accordance with AASHTO LRFD LTS — leaving more time for design decisions and deliverables.

COSS-APP GUI Save Time & Money by Preventing Problems That Can Arise

COSS-APP produces analytical models for cantilever overhead sign structures immediately, so traffic structure designs that fall short of standards get caught at the desk rather than in the field — before they become costly construction issues.

COSS-APP GUI Save Time & Money by Reducing Workload From 200 hours To Several Minutes

COSS-APP reduces STAAD.Pro modeling time for cantilever overhead sign structures from 200+ hours to a matter of minutes, generating compliant models against FDOT specifications, MDOT requirements, DTOP guidelines, and other major DOT standards.

COSS-APP Plug-In for MIDAS CIVIL NX: Tubular Parametric Modeling Cantilever Sign Structure

COSS-APP has been tested against the MIDAS CIVIL NX API, extending platform compatibility beyond STAAD.Pro. Tubular (monotube) cantilever sign structures can be modeled parametrically and analyzed on either platform.

COSS-APP Plug-In for MIDAS CIVIL NX: Tri-Chord Truss Parametric Modeling Cantilever Sign Structure

COSS-APP has been tested against the MIDAS CIVIL NX API for the Florida Department of Transportation Cantilever Overhead Tri-Chord Truss Support Structure, Index 700-040 — pairing FDOT-specific compliance with MIDAS finite element analysis.

COSS-APP Plug-In for MIDAS CIVIL NX: Quad-Chord Truss Parametric Modeling Cantilever Sign Structure

COSS-APP has been tested against the MIDAS CIVIL API for U.S. Department of Transportation cantilever quad-chord truss support structures, bringing advanced finite element analysis to the more complex DOT truss geometries.

COSS-APP Plug-In for Bentley STAAD.Pro: Dual-Chord Truss Parametric Modeling Cantilever Sign Structure

COSS-APP supports dual-chord truss cantilever sign structures — a cost-effective option for medium-span applications, with fewer connection points to fabricate and efficient material use under standard loading conditions. Models generate in minutes rather than hours, follow AASHTO LRFD, and support DOT compliance across multiple state standards.

AI + Bentley STAAD.Pro + MCP + COSS-APP Plug-In

OpenSTAAD MCP is a Model Context Protocol server that connects AI agents directly to Bentley STAAD.Pro through the OpenSTAAD COM API. Starting from a gantry structure modeled in COSS-APP, the model is restructured by a single natural-language instruction — no scripting and no manual node entry.

COSS-APP Plug-In for STAAD.Pro: Foundation Feature for Soil-Structure Interaction (SSI) Models

The Foundation feature brings Soil-Structure Interaction (SSI) into the STAAD.Pro model from the start. Instead of assuming an idealized fixed base, the model reflects how the foundation and surrounding soil actually respond under load — more realistic stiffness, more representative dynamic behavior, and fewer surprises between analysis and field conditions.