I am in grade 12 we have to build a bridge for school.We have to use 25 wooden sticks ( 4mm by 4mm by 600mm) , 2 tubes of epoxy glue and 3m string.
2007-02-11 00:41:47 · 6 answers · asked by kiara_urisun 2 in Science & Mathematics ➔ Engineering
Your best bet is to build a truss with relatively short pieces of your wood. Truss bridges consist of triangles - you've seen alot of old railroad bridges that use trusses. Type "truss bridge" into Wikipedia if you're not familiar. Make the top and bottom chord (straight peices top and bottom) parallel to one another for simplicity. Forget the string, wont do you much good.
Good luck.
2007-02-11 02:16:46 · answer #1 · answered by John D 1 · 0⤊ 0⤋
An arch is one choice to use, but the ends need to be buttressed. An arch is basically an inverted cantenary structure.
A suspension bridge is a cantenary structure.
You should give some more detail, such as what the span is, can you provide any anchorage at the ends, can you have any piers in the span, how your structure will be loaded, does it have to have a deck, etc.
It sounds like you have quite a bit of wood, 15 meters. The string will only be good for tension members, like the bottom chord of a truss or the cable and stringers of a suspension bridge. But a suspension bridge needs piers and anchors at the end.
I would look into a type of scissor truss, and attach stings at the bottom hinges at the end of each span. There are some good websites out there, and if you look at some of my previous posts on popsicle bridges, you will find some basic info on trusses.
2007-02-12 17:11:54 · answer #2 · answered by daedgewood 4 · 0⤊ 0⤋
An arch is the strongest shape in building. Way before modern technology it was used in windows and ceilings. The Romans used arches (look at the Colosseum) and traditional bridges and tunnels were often arched.
Modern building often methods use steel and concrete because it's quick and easy but it's still not as strong as an arch.
2007-02-11 08:46:52 · answer #3 · answered by Trevor 7 · 0⤊ 1⤋
Contact any Civil Engineer nearby
2007-02-12 03:06:20 · answer #4 · answered by Rajesh 3 · 0⤊ 0⤋
I have seen 2 web sites and hope the same may be useful to you.
http://pghbridges.com/basics.htm
http://www.rcmahar.org/staff/jkelley/bridges.htm
2007-02-11 08:50:45 · answer #5 · answered by GURU 3 · 0⤊ 0⤋
shams.............
2007-02-11 10:38:46 · answer #6 · answered by Prince 1 · 0⤊ 0⤋