Risk Category determination out of ASCE-07 (2010) Table 1.5-1 drives the Seismic Design Category (SDC) based on Ss and S1 to a more severe designation in Tables 11.6-1 and 11.6-2. As Craig said, SDC should be provided for sprinkler contractors where this 'severity' has already been determined (seismic protection required...or not); as well as Ss (short-period spectral response parameter) which is used to design for the seismic bracing horizontal load determination using NFPA 13 (2017) Section 9.3.5.9 where bracing is required. The risk categorization of a building or structure as Category IV simply makes it more likely that it will require seismic protection.
Ryan L. Hinson, PE*, SET** \ Burns & McDonnell Senior Fire Protection Engineer O 952-656-3662 \ M 320-250-5404 \ F 952-229-2923 [email protected] \ burnsmcd.com<http://www.burnsmcd.com/> 8201 Norman Center Drive, Suite 300 \ Bloomington, MN 55437 *Registered in: MN, PA, & TX **NICET IV - Water-Based Systems Layout From: Sprinklerforum [mailto:[email protected]] On Behalf Of [email protected] Sent: Wednesday, December 07, 2016 10:41 AM To: [email protected] Subject: RE: Seismic Requirements for Risk Category IV (Essential Facility) Risk Factor doesn't mean anything special to the sprinkler contractor. You need to know Seismic Design Category, not Site Class or Risk Factor. Risk Factor is an input to the structural engineer along with other factors used to define the Seismic Design Category. ASCE 07 indicates what is required to be braced based on Seismic Design Category. You should contact the local building code authority to determine if there are any special requirements for Risk Factor IV if you can't get answers from the EOR. Craig L. Prahl Fire Protection Group Lead/SME CH2M 200 Verdae Blvd. Greenville, SC 29607 Direct - 864.920.7540 Fax - 864.920.7129 CH2MHILL Extension 77540 [email protected]<mailto:[email protected]> From: Sprinklerforum [mailto:[email protected]] On Behalf Of Jerry Van Kolken Sent: Wednesday, December 07, 2016 11:34 AM To: [email protected]<mailto:[email protected]> Subject: RE: Seismic Requirements for Risk Category IV (Essential Facility) [EXTERNAL] The site is Class C, This project is in So. California, EQ bracing is always required. I just wanted to know is there is anything special about Risk Category IV. Jerry Van Kolken Millennium Fire Protection (760) 722-2722 From: Sprinklerforum [mailto:[email protected]] On Behalf Of [email protected]<mailto:[email protected]> Sent: Tuesday, December 06, 2016 2:16 PM To: [email protected]<mailto:[email protected]> Subject: RE: Seismic Requirements for Risk Category IV (Essential Facility) What's the Seismic Design Category assigned by the Structural engineer for the project? A,B,C,D,E? The Fire Protection Engineer should have clarified whether or not EQ bracing was required based on the above category which was determined by the structural EOR if it was done right or done at all. Craig L. Prahl Fire Protection Group Lead/SME CH2M 200 Verdae Blvd. Greenville, SC 29607 Direct - 864.920.7540 Fax - 864.920.7129 CH2MHILL Extension 77540 [email protected]<mailto:[email protected]> From: Sprinklerforum [mailto:[email protected]] On Behalf Of Jerry Van Kolken Sent: Tuesday, December 06, 2016 5:06 PM To: [email protected]<mailto:[email protected]> Subject: Seismic Requirements for Risk Category IV (Essential Facility) [EXTERNAL] I have a building being classified as an essential facility. I'm told that the building must be operation after an earthquake, whether or not that includes the sprinkler system, I will need to get RFI'd. But my question is would there be any special requirements for the hanging and bracing of the sprinkler system due this classification? Jerry Van Kolken Millennium Fire Protection Corp. 2950 San Luis Rey Rd. Oceanside, CA 92058 (760) 722-2722 FX 722-2730
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