Ponte+Vecchio+Bridge+CLM

Concrete - fine grain concrete, weigh 6, cheap, fireproof, weatherproof, molds to any shape, strong in compression, cracks with temperature change, weak in tension.
 * most famous and oldest bridge in Italy *
 * closed spandrel segment stone arch bridge *
 * carries only pedestrains *
 * crosses the Arno River *
 * Longest Span - 30 metres (98 ft) *
 * Width - 32 metres (100 ft) *
 * Beginning Day - 1335 *
 * Complete Day - 1345 *
 * took 10 years to complete the bridge *
 * medieval bridge *
 * bridge spans the narrowest part of the Arno River *
 * it is believed that the bridge was first built in the Roman times *
 * rebuilt with stones then swept again 1333 then rebuilt again *
 * there are shops along the bridge *
 * it was destroyed twice *
 * consists 3 segmental arches *
 * the rise of the arches are 3.5 to 4.4meters*
 * Palazzo Vecchio and Palazzo Pitti are the two points that are connected by the bridge *
 * built in florence italy *
 * costs 70.000 florins to build*
 * compression is the only force acting on the bridge *

Wood - spruce(softwood), weigh 1, cheap, light weight, moderatly strong in compression and tension, rots, swells and burns easily.

http://www.picturecorrect.com/wallpaper/florence/ponte_vecchio_1024x768.htm

http://en.wikipedia.org/wiki/File:Ponte_Vecchio.jpg

http://www.bluffton.edu/~sullivanm/pontevecchio/ponte.html http://www.nationmaster.com/encyclopedia/Ponte-Vecchio__ http://en.wikipedia.org/wiki/Ponte_Vecchio __ http://www.economicexpert.com/a/Ponte:Vecchio.htmhttp://www.pbs.org/wgbh/buildingbig/lab/materials.html __
 * Citations:**