My firm worked on the design of sprinklers in a building that is proposed to sit on oil-filled dampers (Japanese seismic engineering model), designed to absorb a tremendous amount of the energy of an earthquake. Design and construction were put on hold unfortunately, as the cost-projections began to profoundly exceed the budget; I'm not sure if it will be restarted or not. In the course of taking it through Design Development, we worked closely with both structural and civil engineers to come up with solutions to the underground/building system transition and resolving seismic bracing forces. The transition should be relatively easy: the combined resources of the soils, civil and structural engineers should be able to specify the amount of movement between the ground (or raft) and the floor that you would be penetrating with the fire service. That distance (and annular space at the penetration) must be resolved with a flexible connector and while possibly not available as a "listed" product, one can easily be performance-engineered and manufactured per listing standards. You will also need to assess what will likely be a REDUCTION in actual seismic force applied to the building system(s). We found on our project that there was a profound (like, 68% or something like that) buffering by the damped foundation, so in looking forward to designing the sway bracing we had looked up the Ss and other pertinent metrics, and then multiplied everything by .32. As the project is located in the San Francisco Bay Area, is seemed more than a little weird to be "under-designing" sway braces to that extent, but the structural engineer had modeled the building for up to an 8.0 quake and that was the word from on high.
Steve Leyton Protection Design & Consulting San Diego, CA -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Nicky Marshall Sent: Sunday, March 03, 2013 9:06 PM To: [email protected] Subject: Allowing for seismic movement With rebuilding starting to get underway in Christchurch a number of items are being looked at a little closer. One of them is whether we should be allowing for movement due to seismic events between underground services and the ground when they rise into the building to feed building services. One building we are working on has a gravel concrete flooring and foundations 750mm thick sitting on a 1.2m deep gravel raft reinforced with geo-grid. Has anybody looked into this? What solutions have you come up with and how much movement does it allow for? Looking forward to your ideas. Thanks Nicky Marshall Branch Manager (Blenheim) Protech Design Specialist Fire Protection Consultants 03 579 5577 021 433 488 www.protechdesign.co.nz skype: nicky-marshall 105A Alabama Rd, Redwoodtown, Blenheim 7201, New Zealand PO Box 4022, Redwood Village, Blenheim 7242, New Zealand _______________________________________________ Sprinklerforum mailing list [email protected] http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum _______________________________________________ Sprinklerforum mailing list [email protected] http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum
