How ideCAD defines the seismic design category, according to ASCE 7-16?
Seismic design categories of buildings are determined automatically according to Table 11.6-1 and 11.6-2, depending on the SDS and SD1 parameters defined in 11.5 and the risk category.
SYMBOLS
SD1 = Long period design spectral response acceleration parameter for 1 s
SDS = Short period design spectral response acceleration parameter
The Seismic design category is determined automatically based on the short-period design spectral response acceleration parameter and long-period design spectral response acceleration parameter defined in 11.4.5 with risk category by ideCAD software.
SDS
I or II or III
IV
SDS < 0.167
A
A
0.167 ≤ SDS < 0.33
B
C
0.33 ≤ SDS < 0.50
C
D
0.50 ≤ SDS
D
D
SD1
I or II or III
IV
SDS < 0.067
A
A
0.067 ≤ SDS < 0.133
B
C
0.133 ≤ SDS < 0.20
C
D
0.20 ≤ SDS
D
D
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Building Performance Levels per ASCE 7-16
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Seismic calc's. - Zone vs. Design Category question
thread507-400185 Forum Search FAQs Links MVPsForum
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MVPs
(Mechanical)
(OP)
3 Dec 15 14:21My company designs and builds patented track underhung bridge cranes & runways, as well as underhung wire rope hoists. Occasionally a customer requires seismic calc's. for an installation. I have done calc's. for Zone 4 applications, but this customer specifies Design Category 3. A zone was not specified. I have found some info on Design Category. How does Design Category differ from Zone, and are there different calc's and acceleration factors used?
Thanks.
(Structural)
3 Dec 15 14:30What code are you referring to? IBC now uses Design Categories A-F. Zones 1-4 was in the old UBC
(Mechanical)
(OP)
3 Dec 15 14:57Sorry, it's IBC.
(Structural)
3 Dec 15 15:06So do you mean Seismic Design Category C?
Professional and Structural Engineer (ME, NH)
American Concrete Industries
www.americanconcrete.com
(Structural)
3 Dec 15 15:19They most likely meant risk category, see table 1604.5
(Mechanical)
(OP)
3 Dec 15 15:47Seismic Design Category C.
(Structural)
3 Dec 15 18:53I suggest you get with the program. I don't think zones have been used since UBC '97.
(Mechanical)
(OP)
3 Dec 15 19:37I will, gladly. What do I do with the design category?
(Structural)
3 Dec 15 19:39I may be wrong, but it has always appeared to me that:SDC A = Zone 1SDC B = Zone 2SDC C = Zone 3SDC D, E, and F = Zone 4, depending on several different factors.The approximation is rough.
DaveAtkins
(Structural)
3 Dec 15 21:14Quote (I will, gladly. What do I do with the design category?)
You get a copy of the applicable code, and you read it.
(Structural)
4 Dec 15 13:42SDC categories give you the rules for implementation, however you need to know the Ss and S1 values to actually be able to determine the seismic factor and thus the loads. Yes there is some correlation between SDC and zone as DaveAtkins mentioned, but it is not a one-to-one such that simply knowing the SDC will give you the seismic factor to use.
(Mechanical)
(OP)
4 Dec 15 15:57I've been searching for the code online. ICC.org has available, among many others, a 2015 Code and Commentary, Vol. 2, dealing with structural. Would this be a good buy?
(Structural)
4 Dec 15 16:01Yes, that would be a good buy.
Most of the seismic information is in the ASCE 7 document though. I would recommend that you buy ASCE 7-10. The seismic loading methodology is quite a bit different than that in the UBC. There is a chapter on seismic loading of non-structural items such as cranes, although I don't think it addresses cranes directly.
(Mechanical)
(OP)
4 Dec 15 16:15Thanks for your help.
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