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Bridge Engineering Simulations

A collection of interactive 3D visualizations and simulations to help you master concepts in bridge engineering.

Introduction to Bridge Engineering - Theory & Concepts

Understanding the fundamentals, types, classifications, and components of bridges.

Bridge Types & Spans

Interactive Visualization
Required Span Length50 m
10m2000m
Suitable Bridge Types

Beam Bridge

Simplest type. Deck acts as a beam in bending.

Typical Range:10m - 100m
TENSION (Bottom)COMPRESSION (Top)
Compression (Pushing)
Tension (Pulling)

Bridge Loads and Design Principles - Theory & Concepts

Understanding the different types of loads, LRFD load combinations, dynamic effects, and design methodologies in bridge engineering.

Influence Lines Simulator

Interactive Tool

Controls

Unit Load Position (x)5.0 m
Point of Interest (a)3.0 m
Shear V(x)0.500
Moment M(x)1.500

An influence line shows the value of a specific structural response (shear or moment) at a fixed point of interest as a unit load moves across the bridge.

Physical Bridgea1
Influence Lines at point 'a'
Shear IL
Moment IL

Design of Bridge Superstructures - Theory & Concepts

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

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.

Design of Bridge Substructures - Theory & Concepts

Detailed analysis of bridge piers, abutments, foundations, retaining structures, and scour evaluation.

Local Scour Simulator (HEC-18 Concepts)

Hydrodynamic Erosion
Flood Flow Velocity (v)2.0 m/s
Pier Width (a)1.0 m
Streambed Material
Predicted Max Scour Depth3.10 m
Original Streambed

Bridge Bearings and Expansion Joints - Theory & Concepts - Bridge Bearings And Joints

Understanding the function and types of bearings, seismic isolation systems, and expansion joints in accommodating bridge movements.

Thermal Expansion & Joint Sizing

Kinematic Calculator
Superstructure Material
Expansion Length (L)100 m
Temp Change (ΔT)+30 °C
Calculated Movement (Δ)
36.0mm
Expansion (Joint Closes)
FIXED EXPANSION Gap

The bridge expands outward from the fixed bearing. The expansion joint and bearings at the other end must be sized to safely accommodate the total calculated movement Δ.

Bridge Maintenance, Evaluation, and Rehabilitation - Theory & Concepts - Bridge Maintenance And Rehabilitation

Strategies for bridge inspection, non-destructive testing, load rating, structural health monitoring, and rehabilitation.

Load Rating Simulator (RF)

Capacity Analysis
Structural Capacity (C)100 kips
Dead Load (D)30 kips
Live Load (L)40 kips
Dynamic Allowance / Impact (IM)33%
Rating Factor (RF)1.32SAFE (Passes Load Rating)
Capacity
C = 100
L+IM
D
Demand
D = 30
L+IM = 53.2

If Demand (D + L + IM) exceeds Capacity (C), the Rating Factor drops below 1.0, and the bridge is considered structurally unsafe for that load.

Bridge Construction Methods - Theory & Concepts

Understanding the various techniques and methods used to construct bridge superstructures.

Balanced Cantilever Construction

Construction Sequence

Step 0 of 4

Construction begins with the completion of the massive concrete pier and the placement of the 'pier table' (the initial segment directly on top).

Elevation View
Post-Tensioning
Form Traveler
Closure Segment