4. Superstructure

This section covers the superstructure components of the Steel I Girder Bridge, including the main load-carrying elements and their connections.

Complete each subsection in order. The superstructure builds upon the geometry and properties defined in earlier steps.

Components Covered

Component	Description
Bearings	Define FEA bearing elements at support locations
Steel Girders	Create plate girder definitions with variable dimensions
Stiffeners	Add transverse stiffeners for web stability
Connections	Define field splices, shear studs, and gusset plates
Cross-Frames	Model K-frame and X-frame bracing between girders
Deck	Define cross-section and concrete deck properties

What You'll Model

• Bearings: Structural connections between superstructure and substructure

• Plate Girders: Main longitudinal load-carrying steel members with variable flange and web dimensions

• Stiffeners: Transverse web stiffeners at bearing locations and intermediate points

• Field Splices: Bolted connections between girder segments

• Shear Studs: Composite action connectors between steel girders and concrete deck

• Cross-Frames: Lateral bracing system for load distribution and stability

• Concrete Deck: Bridge deck with reinforcement