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[Cob] Difference between cob and rammed earth (reinforcing)Bonnie Morse bonnie.morse at content-mgmt.com
Fri Dec 10 21:22:10 PST 2004
I think reinforcing with bamboo is a great idea. I keep reading that a cob house will withstand a 7.x earthquake at least as well as a wood-frame house. But we in the Pacific Northwest are overdue for an 8.x, or maybe even a 9, earthquake. If we get one in my lifetime, and all the wood-frame structures in my town collapse, I'd like for my cob house (so far still a sparkle in my eye) to be still standing. After all...it might have to serve as the local hospital for awhile! I do have a lingering curiousness about your earthquake tests. Of necessity, you used a small structure...was it 5 feet tall? Any small "thing" will be stronger than a larger "thing". So a 5' structure will withstand a 7.2 earthquake much better than a 10' structure. I assume--and please correct me if I'm wrong--you compensated by building the walls narrower than you would a real cob house. Did you have to do anything else in order to make your results reflect how a real house would behave? Thanks, Bonnie in OR -----Original Message----- From: coblist-bounces at deatech.com [mailto:coblist-bounces at deatech.com]On Behalf Of Ian Marcuse Reinforcing cob in earthquake zones is probably a good idea. Bamboo would work fine I think, embedded vertically would help to prevent shear failure. In our recent earthquake tests at UBC this year, the need for this type of reinforcment was quite clear. Mind you at a 7.2 richter quake the cob held up briliantly without reinforcement, apart from straw. At a >9 richter, the building seriously failed, but without roof collapse. A 9 quake is however extremely rare. If you have bamboo, I doubt that it would hurt. Does anybody have other thoughts on this? We hope to post a video of the quake test on the web soon Ian Marcuse
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