Mechanical, Civil Engineering and Bridges

What is Mechanical and Civil Engineering? They are the engineering disciplines that apply mechanics, kinematics, thermodynamics, material science and structural analysis to build structures (civil), or tools and machines (mechanical).

Forces and beam stress Lateral and vertical stress (bending force) Torsional stress (twisting force) Compression stress (crushing force) Tensional stress (tearing force) Shear stress

Beam bridge One of the oldest types Relies on resistance to vertical stress http://media.photobucket.com/image/beam%20bridge/emmons1315/EHBridge004-2.jpg http://www.luminous-landscape.com/images44/log%20bridge%20thumb.jpg

Sectional beam bridge Relies on resistance to vertical (beams) and compression (piers) stress Girder bridges can be considered a type of this bridge

Suspension and cable-stayed bridges Rely on resistance to tension (cables) and on compression (pylons)

Truss bridges They rely on resistance to tension and compression stress http://faculty.tcc.fl.edu/scma/carrj/Bridges/oldnorth.html

A taxonomy of bridges by the principle forces employed http://upload.wikimedia.org/wikipedia/commons/b/bf/BridgeTaxonomyBW.png

Good and Bad Engineering http://videos.howstuffworks.com/tlc/29833- understanding-tacoma-narrows-bridge-video.htm