Bridges Brian Brenner Aaron Levine Cindy Tran
Some Uses of Bridges • Walkways • Highways/Roads • Railways • Pipelines • Connecting lands • Crossing rivers and canyons
Types of Bridges • Arch • Truss • Cantilever • Cable-Stayed • Suspension
What makes a bridge stay up? • Forces • Compression – a pushing or squeezing force • Tension – a pulling or stretching force • Demonstration • Make groups of two…
Arch Bridges • Keystone – the wedge-shaped stone of an arch that locks its parts together • Abutments – the structures that support the ends of the bridge
Arch Bridges • Works by Compression
Arch Bridges • Where have you seen these bridges?
Cable-Stayed Bridges • Piers – the vertical supporting structures • Cables – thick steel ropes from which the decking is suspended • Decking – the supported roadway on a bridge
Cable-Stayed Bridges • Works by Tension AND Compression
Cable-Stayed Bridges • Where have you seen these bridges?
Suspension Bridges • Similar to Cable-Stayed • Different construction method
Suspension Bridges • Works by Tension and Compression
Suspension Bridges • Where have you seen these bridges?
Other Types Truss Southern Pacific Railroad Bridge, Tempe, AZ Cantilever Firth of Forth-Forth Rail Bridge, Edinburgh, Scotland
Engineering • Engineering – the use of math and science to solve real world problems (like crossing a river) • Civil engineering – designing and building bridges, roadways, tunnels, buildings, dams, etc. Civil Engineer
Branches of Civil Engineering • Structural – bridges, roads, buildings • Geotechnical – foundations, excavations, and tunnels • Transportation – roads, traffic control, airports • Environmental – human impact on the environment
Other Types of Engineering • Mechanical – design machines and moving parts • Electrical – design electrical equipment • Chemical – design processes for mixing chemicals • Computer – design computer hardware and software