Mechanical, Civil Engineering and Bridges

shrubflattenUrban and Civil

Nov 25, 2013 (3 years and 8 months ago)

75 views

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