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BRIDGE BUILDING

BRIDGE BUILDING. Overview. Design. It is the essence of engineering!. Topics of Discussion:. What is a Truss Bridge? The components Types of Truss Bridges The fundamental structural engineering concepts. The 4 key roles in the design construction process.

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BRIDGE BUILDING

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  1. BRIDGE BUILDING Overview

  2. Design • It is the essence of engineering!

  3. Topics of Discussion: • What is a Truss Bridge? • The components • Types of Truss Bridges • The fundamental structural engineering concepts. • The 4 key roles in the design construction process. • How does construction quality affect the end performance of a structure?

  4. A Truss Bridge • A structure composed of load carrying components, also called members, connected together to form a rigid framework. • Most truss bridges are made up of interconnected triangles which make them very strong for their weight.

  5. Components

  6. Components Cont. • Elevation View • Isometric View

  7. Two Common Connections • Pinned Connections: uses a single large metal pin to connect two or more members together much like a pin on a door hinge. • Gusset Plate Connections: More modern way members are connected by one or two heavy metal gusset plates.

  8. Types of Truss Bridges

  9. Types of Foundations • Abutment: They support the bridge and hold back the soil behind them. • Pier: Is used as a support as shown below.

  10. Three Styles of Truss Bridges • Through Truss: When the deck is located at the level of the bottom cord. 2. Pony Truss: Similar to the Through Truss except it is not as tall. • Deck Truss: When the deck is located at the level of the at the level of the top chord.

  11. Fundamental Concepts • Force: Is simplya push or pull to an object. Force always has magnitude and direction (amount of weight & inward direction). Ex: A loaded truck crossing a bridge. • Load: Is simply a force applied to a structure. Ex: weight of vehicles or pedestrians, weight of wind pushing on sides. • Equilibrium: When a structure’s upward force equals the total downwards force. • Reaction: Forces developed at the support (abutments & piers) of a structure to keep the structure at equilibrium. • Tension & Compression: Are internal forces that make a member longer or shorter. Tension stretches a member and Compression pushes the member closer together. • Strength: Is the largest internal force of a structure.

  12. Examples Force Equilibrium Tension Compression

  13. 4 Key Roles in the Design & Construction Process • Owner: Person ororganization that initiates the project. • Design Professional: Responsible for conceiving, planning and providing high quality designs to owner. • Constructor: Responsible for planning, managing and constructing the structure after it has been designed. This is where the engineers come in. • Project Manager: Responsible for managing both the design and construction looks after the owner’s interests.

  14. Construction Quality • Any construction error can cause the structure to fail causing major problems. (accidents, injuries, collapse) • In the case that it doesn’t fail, the appearance of the structure may be off causing it to look sloppy.

  15. Any Questions? Thank you!

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