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[Cob] great article???Shannon C. Dealy dealy at deatech.com
Sat Jul 16 02:45:13 PDT 2005
On Thu, 14 Jul 2005, Barbara Roemer wrote: > I disagree with Ocean. Earth buildings have a very spotty history in The spotty history of earth buildings in seismic zones so far as I have seen and heard is strictly limited to mud brick / adobe style construction. Monolithic cob type structures (which are not nearly as widely used) have generally done very well. > seismic zones. With particular waves, they are deadly. To get any cob > structures through CA code, or any other spot with seismic considerations, > it will take some kind of cohesive exoskeleton or internal web, something > much more continuous than the straw in cob. It is true that adobe bricks [snip] I know of no information which would support this statement, at most it could be said that the above would be true if one wanted an easier way to get something "cob like" code approved in a seismic zone, but the same could be said of going post and beam with cob infill, these approaches are not unreasonable compromises, but are by no means a proven necessity for cob in a seismic zone. To get proper cob code approved in a seismic zone will require the same thing that any other new material requires, good structural engineering data to design from, backed by proper materials testing data. The recent shake table tests at the University of British Columbia would appear to indicate that cob can be designed and constructed to meet seismic codes (without exoskeletons or internal webs), and the past history of some real world cob structures backs this up. The question is not can it be done or can it meet code, but rather who will foot the bill for the necessary engineering data so it can be constructed correctly for a seismic zone. Shannon C. Dealy | DeaTech Research Inc. dealy at deatech.com | - Custom Software Development - | Embedded Systems, Real-time, Device Drivers Phone: (800) 467-5820 | Networking, Scientific & Engineering Applications or: (541) 929-4089 | www.deatech.com
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