i need information about precast?
406249
There is precast concrete, is that what your are asking about?\n\nThese are concrete construction members that are cast in a factory and then transported to the construction site. Some of these memeber, such as bridge and building beams are prestressed during the casting process. Concrete can not stand a tensil strain, only a compression strain. Beams are subject to both compression and tension. So to eliminate the tensil strain that the beam will be subjected to the beam when it is cast, is preloaded with a compression load. This is done by imbedding steel rods in the concrete and subjecting the rods to a tensil load during the casting. After the concrete has cured, the tensil load on the steel is released and the steel trys to return to its natural state, putting a compression load on the beam that will counteract the tensil load that the beam will be subjected to after implacement. Even concrete columns, which do not have a tensil load, contain steel rods and steel mesh to absorb any tensil load that the concrete might encounter. That is to be assured that if they are subjected to a tensil load, by wind shear for example, or during transport and erection, they will not suffer a tensil strain. The steel in the concrete absorbs the tensil load instead. They, however, are not normally, prestressed.
163318
You can check here:\n\nhttp://www.dslreports.com/prequal
198802
http://www.ccaha.org/arch_rec/lecture.php?lec_id=price_fabrication
633664
Try this website, it will tell you everything you need to know. I use it for my projects/
536438
try\nhowstuffworks.com
860530
visit\nhttp://www.diytrade.com/directory/global/buy/products-list/0902-t-i-1/Wire_Mesh.html
441675
Go here it has the info you need:\nhttp://en.wikipedia.org/wiki/Preprocessor
112130
go to starzcasting.com. they've got some good info for beginners plus casting calls you can search for in your area... and it's all free. good luck!
61796
www.anvilstudio.com/ I hope this is the kind of thing you're looking for. :)
919699
Try:\n\nhttp://baycongroup.com/el0.htm
237010
Try buying a copy, try a local structural design firm, try a local engineering school, try a local library.\n\nIf you know enough to use the load factors, you should know enough to find them.
741339
Here are some good engineering resources :\n\n- EngNet Engineering Directory\n- ProgressiveEngineer [dot come]\n- GlobalSpec\n-Thomas Net\n\nhttp://www.tempcomfg.com/\n\nGood Luck!
288354
I know of a pretty good site for this kind of thing and it is based in the Pacific Northwest. The address is:\nwww.backyardrecreation.com
87739
I would recommend:\nmath teacher\narchitect\nengineir\n:D
438341
Go to wikipedia.com\nand search civil engineering....
148544
check out www.creonline.com great info look in the how-to section, many articles
318289
Hi,\n\nI have looked up a heap of information for you so all you have to do is copy, paste and click the address below (under sources) and you can take your pick about which info you use, OK?\n\nGood Luck,\nJan Smith\nwww.constructingprofits.com