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Re: Factors

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Thanks, Neil.
We are doing some design work in the NMSZ. The forces are crazy, the soils 
are bad, and the people generally don't seem to think 1812.

SGE Mobile

> On Feb 21, 2015, at 10:35, nma <nma(--nospam--at)nma-se.com> wrote:
> 
> Good explanation Steve.  A coincidence; talked to an engineer yesterday 
> who is designing substations in the New Madrid area. 
> Neil Moore, SE
> shingle springs ca
> 
>> On 2/21/2015 10:19 AM, V. Steve Gordin wrote:
>> Thor,
>> These parameters are from the basis of seismic design in the US - ASCE7-10 
>> (Minimum Design Loads for Buildings and Other Structures). Ss is a mapped, 
>> short period, spectral response acceleration parameter 
>> <http://earthquake.usgs.gov/hazards/about/technical.php#accel> (essentially, 
>> a location-specific seismic acceleration) - an important component for 
>> the determination of the seismic force.  Ss=2.6 is very high, higher than 
>> for most of California.  Most of the equipment we design for is usually 
>> rated for Ss<=2.2.  This is not to say Ss cannot be higher - it can, in 
>> some areas of California and, particularly, in the New Madrid Seismic 
>> Zone. Ip is the importance factor for the calculation of the seismic force 
>> on non-structural components (ASCE7-10 Chapter 13).  Ip=1.5 for hazardous 
>> 

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