1. By: Mohamed Ahmed, EIT Clark dietz, inc
Bridge Engineering
By: Mohamed Ahmed, EIT
Clark dietz, inc

2. Bridge Methodology Passing vehicles vibrate the bridge
Mini earthquake, but bridge is designed for to attenuate sideway (wind) and vertical (load balancing) movement.
Static forces is understanding how a bridge moves.

3. Fundamentals Span: length and distance between supports.
Force: applied action that displaces a balanced point.
Compression: force that compress or shortens an object.
Tension: force that expands or lengthens and object.
Beam: horizontal structural member.
Truss: short straight segments joined to form triangles and together act as rigid frame.
Compression
Tension
Beam
Pier

4. Type of Bridges Beam Bridge Arch Bridge: Suspension
Depend on various features of the obstructed object; generally size of obstacle.
Three types of bridges:
Beam Bridge
Arch Bridge:
Suspension
Main difference is their span.

5. Beam Bridge
Beam Bridge: Horizontal members carry load of bridge to support. Longer distance to support, weaker it becomes. Shortest maximum span among the three types.
When a force pushes on beam, beam bends. Top of beam is pushed together and bottom apart.

6. Arch Bridge:
In Truss bridge: all members of truss bridges are either in tension or compression
Generally no bending.
Arch bridge: is squeezed together and the force transfers to the supports. The support push back and balances the force.

7. Suspension Bridge: Spans over larger distance 2,000 ft to 7,000 ft.
Most roadway are supported with trusses to prevent bending.
Roadway hangs from massive steel cable systems anchored from tower and anchorage.

8. Design Methodology

9. Thanks!