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Protection notice / Copyright notice© Siemens AG 2008. All rights reserved.
WhatWhat‘‘s Shakins Shakin‘‘? ?
Seismic ComplianceSeismic ComplianceLV/MV Product LinesLV/MV Product Lines
Brian CampbellBrian CampbellSenior Product EngineerSenior Product Engineer
Gary GluckGary GluckConsulting Business DeveloperConsulting Business Developer
SiemensSiemens
June 17, 2011June 17, 2011
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Overview
Importance of Seismic Codes
Seismic variables
Siemens compliance levels
OSHPD seismic pre-approvals
Dynamic Shake testing
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Tale of 2 Cities – Recent Earthquakes
Port-au-Prince, Haiti Quake M7.3 Moment magnitude scale 222,000 deaths. 300,000 injured 1.3 million made homeless Destroyed Presidential Palace,
National Assembly building 2 major quakes since 1860 Building codes – limited seismic
Santiago, Chile quake
M8.8 Moment magnitude
486 deaths
200,000 homes damaged
So powerful, made earthday1 μ-sec longer
Santiago avg 2 major quakes / year
Building codes – strict seismic
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What do your specifications look like for seismic?
If you are using the new CSI formatted specifications, you If you are using the new CSI formatted specifications, you probably have a section that looks like this:probably have a section that looks like this:
This spec section will have some definitions and some This spec section will have some definitions and some requirements for submittals. It may even have a section requirements for submittals. It may even have a section entitled project conditions that looks like the following:entitled project conditions that looks like the following:
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The problem with this specification is that it is uses obsolete terms, concepts and data
The balance of this presentation will cover The balance of this presentation will cover what the current building codes require, what the current building codes require, what a manufacturer needs to do in order to what a manufacturer needs to do in order to comply with code, and suggestions for comply with code, and suggestions for updating your specifications.updating your specifications.
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Seismic Codes – United States
Current CodesCurrent Codes IBC – International Building Code, 2009 Adopted throughout U.S. Basis for shake table testing
CBC – California Building Code, 2010 Seismic sections – identical to IBC
ASCE – Design Loads for Bldgs, 2010 American Society of Civil Engineers Basis for IBC seismic sections
Obsolete CodesObsolete Codes Regional Codes – merged to create IBC code (2000) BOCA – Building Officials and Code Administrators –
East Coast UBC – Uniform Building Code – West Coast SBC – Standard Building Code – Southeast
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Seismic Terms - change over time
IBC 2000 +SBC 1999BOCA 1999
UBC 1997SBC 1991
BOCA 1990Model Codes
Location
Building use
Soil type
Location
Building useLocation
Criteria for
Classification
A, B, C, D, E, FA, B, C, D, EZone 2
Zone 4Classification
Seismic Design Category
Seismic Performance Category
Seismic Zone
In ForceIn ForceObsoleteObsoleteObsoleteObsolete
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Obsolete terms
Obsolete terms since 2003Obsolete terms since 2003--IBC introduced:IBC introduced:
Zone 2
Zone 4
Seismic Use Group
Do these terms still show up in your specs/drawings?Do these terms still show up in your specs/drawings?
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These building code changes require that specifications that look like this:
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Look more like this:
[Manufacturer Seismic Qualification: The low voltage switchboard(s) shall meet and be certified to seismic requirements specified in the [IBC 2009 International Building Code] [CBC 2010 California Building Code] [ASCE American Society of Civil Engineers 7-10].
The low voltage switchboard(s) shall be complaint with IBC 2009 parameters:Building Occupancy Category (as defined in Table 1.1 from ASCE 2010): [I] [II] [III] [IV] Seismic Design Category: [A] [B] [C] [D] [E] [F] Site Class: [A – Hard Rock] [B - Rock] [C – Very dense soil and soft rock] [D –Stiff soil profile] [E – Soft Soil Profile] [F – Soil vulnerable to potential failure or collapse under seismic loading] as defined in IBC 2006 Table 1613.5.2 Site Class DefinitionsIp – Importance Factor: [1.5 – Components must function after an earthquake for life safety purposes (Building Occupancy Code IV)] [1.0 – Non-essential buildings. Function not life critical. (Building Occupancy Code I and II)]Ss – Mapped Spectral Accelerations for Short Periods at 0.2 seconds – [239%g] [300%g – for RCS rear connected switchboards only]Sds – 5% Damped Design Spectral Response Accelerations for Short Periods at 0.2 seconds – [XXXX]
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Calculate design earthquake Forces - ASCE
FFpp = design Force= design Force
Occupancy Category, Bldg
function Ip = Importance
factor
Site class = soil properties
Bldg height & mounting floor
Wp = Weight of product
SS = Spectral accel, design earthquake
Fp = (.4) (.67) SS Wp Ip
2.5Mounted @ ground level Site Class D
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IBC - Building Use
Occupancy CategoryOccupancy Category 1 – Low hazard to human life. Storage, temp facility 2 – Average hazard to human life. 3 – Substantial hazard. > 300 people. School, Factory, etc. 4 – Essential, human life critical. Hospital, fire station,
emergency center, aviation traffic, etc.
IIPP -- Importance factorImportance factor
IP = 1.5, component must function after earthquake life-safety purpose All Occupancy Category 4 bldgs Example: SWBD in hospital
IP = 1.0, non-essential bldgs. Function not critical
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IBC - Site Class
A, B, C, D, E, Fbased on soil type
used during design of structure
Site Class A hard rock
Site Class D stiff soil, most common
Site Class F peat, loose soils
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Seismic Design Category
A, B, C, A, B, C, DD, E, F , E, F
Inputs to Seismic Design Category:Inputs to Seismic Design Category:
Location
Building Use (Occupancy Category)
Soil Type (Site Class)
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Seismic Design Category Graphically
Seismic Design Seismic Design CategoryCategory
SS = Spectral accel, design earthquake
This is essentially what constituted the old This is essentially what constituted the old Zone 4Zone 4
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Switchboard frame strengthened for Seismic
Seismic frame Corner Gussets added
Non-seismic frame
Siemens Siemens drawings drawings will show will show the boltthe bolt--down down pattern. An pattern. An engineer engineer will still will still need to need to perform perform calcs for calcs for torque torque valuesvalues
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Seismic Spectral acceleration Maximum Considered Earthquake
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Seismic Spectral acceleration Maximum Considered Earthquake
SS = 2.90g Mapped Max considered earthquake (California)
SDS = 1.93g Seismic design spectral accel, short period (0.2 sec)
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SDS Seismic design spectral acceleration, short period (0.2 sec)
For high seismic zones:For high seismic zones:
SSDSDS = 0.67 * S= 0.67 * SS S (Mapped Max considered earthquake)(Mapped Max considered earthquake)
California Maximum SCalifornia Maximum SDSDS = 1.93g(this value varies greatly across = 1.93g(this value varies greatly across the state!!)the state!!) Proposed changes to 2012Proposed changes to 2012--IBC would increase SIBC would increase SDS DS up to 2.49g up to 2.49g
in California!in California!
SSDSDS values values -- shown in Compliance Documentshown in Compliance Document
DO NOT SPECIFY SDO NOT SPECIFY SDS DS = 1.93 FOR CONVENIENCE!!! = 1.93 FOR CONVENIENCE!!!
THIS WILL UNECESSARILY ADD COST TO YOUR PROJECT. USE THE THIS WILL UNECESSARILY ADD COST TO YOUR PROJECT. USE THE VALUE APPROPRIATE FOR YOUR PROJECT LOCATION!!!VALUE APPROPRIATE FOR YOUR PROJECT LOCATION!!!
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Specific Seismic Hazard information is available on the USGS website.
For this example, Beverly Hills is chosenFor this example, Beverly Hills is chosen
First, calculate SFirst, calculate Sss
http://earthquake.usgs.gov/hazards/designmaps/javacalc.phphttp://earthquake.usgs.gov/hazards/designmaps/javacalc.php
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We can now calculate SWe can now calculate SDSDS
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This pop up window will appear. Once you click OK, the This pop up window will appear. Once you click OK, the values shown will update the previously viewed tablevalues shown will update the previously viewed table
Choose Site Class Choose Site Class (A, B, C, D, E, F)(A, B, C, D, E, F)
““DD”” most commonmost common
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This is the This is the value that value that the the SDsSDs of of the the equipment equipment must must exceed.exceed.
This is the This is the SdsSdsvalue that our value that our equipment must equipment must exceed in order exceed in order to comply with to comply with IBC2009IBC2009
http://earthquake.usgs.gov/hazards/designmaps/javacalc.phphttp://earthquake.usgs.gov/hazards/designmaps/javacalc.php
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BTLV Seismic Compliance – 2009 IBC
Seismic brochures for all Siemens LV equipment: http://www.sea.siemens.com/us/Products/PowerDistribution/Product/WL-Low-Voltage-Switchgear/Pages/WL-LV-Switchgear-Technical-Overview.aspx
Superseded StandardsSuperseded Standards
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Shake Table Testing
10 x 10 hexagon table10 x 10 hexagon table
Independent triIndependent tri--axial systemaxial system
Pittsburgh, PAPittsburgh, PA
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Input Motions
Resonant Frequency Search – sweep 1 to 33 Hz
Input Motion – 3 axes separately (X, Y, Z)
STAY AWAY STAY AWAY FROM FROM 60HZ!!60HZ!!
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Essential buildings Ip = 1.5 (Hospitals, etc)
Elect. equipment - remain operable following seismic test
Anchoring system intact
No life-safety hazard due to collapse or subassembly separation
Minor structural damage in frame - allowed
non-Essential buildings Ip = 1.0
Equip. operable or not operable, following seismic test
Anchoring system intact
No life-safety hazard due to collapse or subassembly separation
Minor structural damage in frame - allowed
Criteria to Pass Seismic Test
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A.Manufacturer Seismic Qualification: The low voltage switchboard(s) shall meet and be certified to seismic
requirements specified in the CBC 2010 California Building Code.
What should your specifications look like?What should your specifications look like?
Building Occupancy Category (as defined in Table 1.1 from ASCE 2010): [I] [II] [III] [IV]
The low voltage switchboard(s) shall be compliant with IBC 2009 parameters:
Seismic Design Category: [A] [B] [C] [D] [E] [F]
1.1. The low voltage The low voltage switchboard(sswitchboard(s) shall be compliant with IBC 2009 ) shall be compliant with IBC 2009 parametersparameters
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c. Site Class: [A – Hard Rock] [B - Rock] [C – Very dense soil and soft rock] [D – Stiff soil profile] [E – Soft Soil Profile] [F – Soil vulnerable to potential failure or collapse under seismic loading] as defined in IBC 2006 Table 1613.5.2 Site Class Definitions
e. Sds – 5% Damped Design Spectral Response Accelerations for Short Periods at 0.2 seconds –xxxx (Location Specific, may be available from architect or can be derived from USGS application)
d. Ip – Importance Factor: [1.5 – Components must function after an earthquake for life safety purposes (Building Occupancy Category IV)] [1.0 – Non-essential buildings. Function not life critical. (Building Occupancy Category I and II)]
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