Back to Bridge Engineering repository
Bridge Engineering2D

Design of Bridge Superstructures - Theory & Concepts

Detailed analysis of bridge decks, girders, load distribution methods, and superstructure design considerations.

Open the complete lesson

Composite vs. Non-Composite Action

Cross-Section Analysis
Structural System
Applied Load Magnitude1.0x

Composite Behavior

Shear studs connect the deck to the girder. The concrete takes compression, and the steel takes tension, shifting the Neutral Axis (NA) up. This massively increases stiffness and capacity.

Cross SectionConcrete DeckN.A.
Strain Profile- CompressionTension +
Strain discontinuity at the deck/girder interface indicates slip (Non-Composite).
A continuous strain line indicates perfect composite action.

Related simulations

Introduction to Bridge Engineering - Theory & ConceptsBridge Loads and Design Principles - Theory & ConceptsDesign of Bridge Substructures - Theory & ConceptsBridge Bearings and Expansion Joints - Theory & Concepts - Bridge Bearings And Joints