INTRODUCTION TO BRIDGE INSPECTION Bridge Building and Safety

Bridge of The God’s Construction � https: //www. youtube. com/watch? v=R 0 Cv_MDj TYY

Types of Bridge Materials • • Timber Concrete Reinforced and Prestressed Steel Masonry

3 Major Components of a Bridge � � � Deck Superstructure Substructure

Deck • • Deck distributes loads to the Superstructure Carries the roadway surface

Superstructure • • Superstructure distributes loads to the Substructure. Supports the Deck

Substructure Supports the Superstructure and distributes load into the ground.

All 3 Components Working Together

Common Types of Bridges Truss Bridge Suspension Bridge Arch Bridge

Common Types of Bridges Slab Bridge (Simple Beam) Cable Stay Bridge Moveable Draw Bridge

Common Types of Bridges Covered Bridge Cantilever Bridge

Forces Tension Ex. Rubber Band Being Pulled Compression Ex. Sponge Being Pushed Down

Bending Compression Tension

Real Life Example

How Would You Build a Strong Bridge? � � Reinforcement (Ex. Rebar in Concrete) Building Your Truss With Triangles � � Because the triangle does not easily deform and is able to balance the stretching (tension) and compressive forces inside the structure. Visualize what bridge members will have the most force put on them during judging. With that figure out how to get maximum strength in those members.

Problems Bridges Face � � � Decay Corrosion Scour Loads from freight Fire Settlement Loss of Bearing Area Movement Distortion Damage Abrasion /Wear

Defects � Decay � Corrosion

Defects � Scour � Loads

Defects � Fire Results

Defects Loss of Bearing Settlement

Defects Distortion Movement

Defects Damage

Defects Abrasion

Inspection and Maintenance � Various Types of Inspections � Routine – Maximum every 2 years � Fracture Critical Maximum every 2 years � Fatigue Prone � Timber Boring � Moveable Bridge � Deck Survey

Inspection and Maintenance � Replacing bridge members as needed � Cleaning off and removing debris � Fumigating Timber Members � Applying sealants and protective coatings