seismic ceiling suspension - suppliers -...
TRANSCRIPT
SEISMIC CEILING SUSPENSION
Better.
Faster.
Easier.
Reliable.
Efficient.
Compliant.
Fast. Easy. Customer Focused.®
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Seismic Codes: Development and Adoption
Purpose of Installation Requirements for Suspended Ceilings• Suspensionsystemsstrongenoughtoresistlateral forceimposeduponitwithoutfailing.
• Preventborderpanelsfromfallingfromtheceiling plane.
Federal Emergency Management Agency (FEMA)Seismic performance during recent large Californiaearthquakes prompted FEMA to address several concernsincluding suspended ceiling performance during a seismicevent.Researchand testsdemonstrated that current industryseismic standards (UBC Standard 25-2) were not adequate.FEMA determined that the key to good seismic performancewassupportof individualpanelsatwallsandexpansionjointsandinteractionwithsprinklersystems.Source:FEMA368NEHRPRecommendedProvisionsforSeismicRegulationsforNewBuildingsandOtherStructures
The Code Official is the Only Authority to Enforce Code ComplianceThebuildingcodewasestablishedtosetminimumrequirementsforlifesafetyandpreservationofproperty.Itisimportanttoknowthatwhilethebuildingcodeestablishestherequirements, it isthecodeofficialthathasthepowertoenforceitsprovisions.
The code official also has the latitude to allow materials andmethodsofconstructionthatarenotaddressedinthecode.Inthiscase,anofficialcanperformtheirownanalysisofevidencepresentedorcanrelyonindependent,qualifiedsourcessuchasICC-EStodotheanalysisandprovidetheirfindings.
Theresultingreportisspecific,technicalevidenceonwhichthecodeofficial canbaseapproval of aparticulardesignwithoutdelayingconstruction.
New Seismic CategoriesAccordingtotheInternationalBuildingCode,aSeismicDesignCategory must be established for each construction projectbasedon:
1. Anticipatedgroundmotion
2. Typeofsoilinaspecificgeographicarea
3. Occupancycategory
All50statesandtheVirginIslandsusetheInternationalBuildingCode(IBC)atalocalorstatewidelevel.
EarthquakesAre Coming!
• California — 62% probability of at least one magnitude 6.7 or greater quake in the San Francisco Bay region before 2032.
• East Coast & Midwest — 90% probability of a magnitude 6 to 7 event occuring within the next 50 years.
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Industry Standard Construction
ASCE 7-05 Section 13.5.6.2.1 Seismic Design Category CReference CISCA Recommendations for Seismic Zones 0 - 2
• Theceilingmustbeafree-floatingsystem,notattachedatanywalls.
• MainandCrossTeesneedaminimumof3/8)clearancefromthewalls.
• AllperimetergridcomponentsmustbetiedtogethertopreventspreadingusingSpacerBars,orothermeans.
• MustuseSafetyWiresonlightfixtures.
• PerimeterSupportWiresrequiredifWallAnglesupportledgeislessthan7/8).
• IntermediateDutysystem,60lb.minimumconnectionstrength.UseofhookCross Teeconnectionisacceptable.
• RefertoIBC2006,ASCE7-05andCISCASeismicZones0&2forcompletedetails.
ASCE 7-05 Section 13.5.6.2.2 Seismic Design Categories D thru FReference CISCA Recommendations for Seismic Zones 3 & 4
• Ceilingareaslessthan144ft2areexemptofstandardconstructionrequirements.
• HeavyDutysuspensionsystemmustbeused.
• Allsystemconnectionsneedtowithstandaminimumconnectionstrengthof180lbs.
• AWallAnglewitha2)ledgesupportmustbeusedattheperimeter.
• Ceilingmustbeattachedontwoadjacentwalls.
• Theopposingwallsmustbeunattached,witha3/4)clearancefromthewallfortheMainorCrossTees.
• SpacerBars,orothermeans,mustbeusedtotieperimetercomponentstogetheronunattachedwallstopreventspreading.
• PerimeterWiresmustbeusedwithin8)fromthewallonallfourwalls.
• SafetyWiresmustbeattachedtothelightfixtures.
• LightFixturesmustbepositivelyattachedtothegridsystem.
• Ceilingpenetrations,likesprinklers,mustprovideclearanceformovement.
• Ceilingareaslargerthan1,000ft2requirehorizontalrestraintevery144ft2consistingoffourdiagonalSplayWiresorrigidbracesincombinationwithaCompressionPost.
• Ceilingareaslargerthan2,500ft2requireaSeismicSeparationJoint.
• CeilingssubjecttospecialinspectionperASCE7-05Section13.5.6.2.2(h).
• RefertoIBC2006,ASCE7-05andCISCASeismicZones3&4forcompletedetails.
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Becauseceilingpanelperformanceandnon-teebarsuspensionsystemsarenotwelldefinedintheIBCrequirements,CMCisworkingwithanindependent,internationallyrenownedstructuralengineeringfirmtotestbothstandardandnon-standardceilingsystemsforseismicperformance.Theresultsofourfull-scaleseismictestsofferprovensafetyandperformancesupportforstandardandnon-standardceilings,flexibledesignoptions,andmoreefficientinstallationdesigns.
ThefollowingCMCgridsystemsareacceptableforuseinInternationalBuildingCodeSeismicDesignCategories:200 Snap-Grid / 640, 650, 660 & 670 Drywall / 660 Wide Face / 730 All Stainless Steel / 830 All Aluminum / 1200 Seismic / 1260 Aluminum Cap / 4500 & 4600 Bolt Slot / 4000 Tempra™
ContactChicagoMetallicforspecificcomponentsandcorrespondingSeismicDesignCategories.Note:Checklocalcodeforinstallationrequirements.
Youwillfirstneedtoverifytheseismicdesigncategoryforthebuildinginwhichyouwillbeinstallingyourceiling.Thisinformationwillbedeterminedbythearchitectordesigneronrecord,andcanbefoundinthegeneralinformationsectionofthespecificationsorinthegeneralnotesonthestructuraldrawings.Youwillthenwanttorefertothebuildingcodeandinstallationstandardsthatarecurrentlybeingusedoracceptedinyourjurisdiction,andareavailablefromyourlocalcodeofficial.
ASeismicDesignCategory(SDC)isaclassificationassignedtoastructurebasedonitsoccupancyoruse(OccupancyCategory)andonthelevelofexpectedsoilmodifiedseismicgroundmotion.Thiscanbeexpressedschematicallyasfollows:[Occupancy Category] + [Soil modified seismic ground motion] SDC
GenerallyacceptedinstallationstandardsarebasedoncurrentversionsoftheIBC,ASCE-7,theCISCASeismicdocuments,andtheASTME580,andarestraightforward.Ifyouneedadditionalassistance,pleasefeelfreetocontactourTechnicalServicesteamat800-323-7164,option3.
Eachlocalorstategovernmentofficehasadepartmentthatmanagesbuildingpermitsandconstructionrequirements.Youshouldcontactthemtoseewhatinstallationstandardstheywillrequire.
Can I use any CMC grid in seismic applications?
Where can I find the information I need to install ceilings to meet seismic requirements?
Where can I find instructions detailing each step needed to install ceilings that meet seismic design categories?
How can I verify what codes my local or state officials require us to follow?
Seismic Ceiling Installation: FAQ
What is a seismic design category?
Seismic DesignCategory (SDC)
What does it mean?
A Very small seismic vulnerabilityB Low to moderate seismic vulnerabilityC Moderate seismic vulnerabilityD High seismic vulnerability
E and F Very high seismic vulnerability and near a major fault
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ChicagoMetallichasdesignedaseismicperimeterclip,item#1496.00,whichprovidesfortheuseofa15/16)wallanglewhileeliminatingtheneedforperimeterspacerbars.ThiscliphasbeenrecognizedbyICC-ESasanalternativeinstallationthatiscompliantwiththeIBC.OfficialapprovalofthisalternativeremainsthepurviewoftheAuthorityHavingJurisdiction(AHJ).SeeICC-ESESR-2282atwww.icc-es.org.
ChicagoMetallic’sseismicgridsystem,includingthe1496.00perimeterclip,wasrigorouslytestedattheStructuralEngineeringEarthquakeSimulationLaboratory(SEESL)attheStateUniversityofNewYorkatBuffalo.Theevaluationprocess,includingroomsizetestingonshaketablesattheUniversityweremonitoredbyengineersfromChicagoMetallicandtheStateUniversityofNewYorkatBuffalo,aswellasbyengineersfromanindependentstructuralengineeringgroup,toinsureaccuratedatawasproperlycollectedandsummarized.ThisreportwasthensubmittedtoICC-ES,whereoursuspendedceilinggridandperimetercliphasbeenrecognizedbyICC-EStoperformasrequiredbythecurrentIBC.
Ourevaluationreport(ICC-ESR2282)fromICC-EScanbefoundontheirwebsiteatwww.icc-es.org.Theevaluationreportcanbefoundunderthesearchfunctiononthewebsite,byenteringeitherourmanufacturers’name(ChicagoMetallic),orourICC-ESreportnumber(2282).Thereportwillprovideindetailtheevaluationofourproductandproperinstallationrequirements.ThereisalsoalinktothereportdirectlyfromtheChicagoMetallicwebsite.
ChicagoMetallichasdesignedwhatwebelieveistheonlyseismicseparationjointalternativethathasbeenbothtestedattheStateUniversityofNewYorkatBuffaloandevaluatedbyanindependent,internationally-renownedstructuralengineeringgroup.TheSeismicSeparationTee(SST)fromChicagoMetallichasbeendesignedtoprovidemovementduetoseismicactivityalongtheseparationjoint.SeismicactivitycausestheSSTteestomovelinearly,thuseliminatingtheneedforaconventionalseparationjoint.
Otherbenefitsovercompetitiveproductsorstandardrecommendedinstallationsinclude:aone-stepinstallationprocess–Justinserttheteesandinstallpushrivetstocreatetheexpansionjoint,andyouaredone.Thereisnogoingbacktocutmainorcrossteesortoaddadditionalchannels,anglesorclips.
OurindependentstructuralengineeringgrouphaswrittenasummaryreportthatshowsthatourSSTperformsinsuchawaythatmeetstherequirementsoutlinedbytheIBC.ThisreportcanbedelivereddirectlytothecodeofficialbycontactingChicagoMetallicandprovidinguswiththecodeofficialscontactinformation(name,address)alongwiththeprojectnameandlocation.
My building owner does not like the 2) wall molding that is required in IBC seismic design categories D, E and F. Is there an alternative?
How can local code officials be sure that the use of the Chicago Metallic perimeter clip 1496.00 is compliant with the IBC?
Where can the local code officials or I find verification of the testing, or recognition byICC-ES?
Seismic Ceiling Installation: FAQ
Has an alternative method for seismic separation joints been developed yet?
Is there written documentation for the SST too?
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Seismic Ceiling System Details
1496 Seismic Perimeter Clip
Thoughsuspendedceilingsareconsiderednon-structural,recommendationsforseismicstabilizationdoexist.However,traditionalseismicceilingconstructioniscostly.Additionaljointclips,wires,stabilizerbars,andseismicseparationjointsincreasethecostofmaterials,whileattachingseparatorclipsandfieldcuttingcrossteessignificantlyimpactlaborcosts.InadditiontoitsSeismic1200IntermediateandHeavyDutygrid,ChicagoMetallicnowintroducestheSeismicSeparationCrossTee(SST™)andPerimeterClip,bothofwhichcansaveupto75%inmaterialandlaborcostscomparedtotraditionalinstallationmethods.
Eachseismicdesigncategoryhasspecificrequirementsregardingperimetercomponents,andour1496SeismicPerimeterCliphasbeenengineeredtomeetthem.Currentcoderequirementsincludea2)wideperimeterwallmolding,andstabilizerbarstoprovidesupport,andpreventtheceilinggridfromspreadingapartalongthemolding.ChicagoMetallic’sSeismicPerimeterClipmeetsseismiccriteriasetforthbytheInternationalBuildingCode(IBC)tostabilizemainandcrossteesattheceiling’sperimeter,asdetailedinICC-ESReport#2282.Thiscliptiestogetherperimetercomponentsandhasbeentestedandrecognizedasanalternatemethodofstabilizingteesattheperimeter.Itsrobustconstructionallowscontractorstouseasleek15/16)angleinlieuofthelessdesirable2)angleandeliminatescostlystabilizerbars.ThePerimeterClipiseasytoinstall.Clearlyvisibledimensionmarkersontheclipshowtherequired3/8)or3/4)clearanceofthegridtothewall.Anintegralbackplateaccommodatestheadditionalattachmentofthecliptothewalland/orwallangleifdesired,andscrewholesprovideeasyattachmenttotheteewhennecessary.Theclipisabrightbrasscolor,makingiteasilyidentifiableduringon-siteinspections.Thecommercialqualitysteelclipfitscommongridcomponentsandcanbeusedwithlay-inpanelceilings.
ChicagoMetallic’sExposedTeegridincludesseismicandfire-ratedseismicconstructions.The1200SystemisofferedforIntermediateDutyandHeavyDutyperformanceperASTMC635tosatisfytherequirementsofallSeismiccodeconstructions.Theexposedteeconstructionpermitsdirectupwardaccesstomechanicalsystemsandisacost-effectivesolutiontoseismicrequirements.Stab-incrossteescantileverduringinstallationandwillnotfallout,makingforaneasierinstallationandprotectingagainstlateralpull-out.WhenusedwiththeSeismicSeparationTee,the15/16)widefacecreatesasleekceilingdesigninallseismicinstallations.
Seismic 1200 Exposed Grid
ThefollowingCMCsystemsgridareacceptableforuseinInternationalBuildingCodeSeismicDesignCategories:
1200Seismic 1260AluminumCap 660WideFace 4000Tempra™
4500Ultraline™
4600Ultraline™
ContactChicagoMetallicforspecificcomponentsandcorrespondingSeismicDesignCategories.
Note:Checklocalcodeforinstallationrequirements.
3/8)and3/4)dimensionmarkersBackPlate
TeeAttachmentScrewHoles
• Stab-incrossteeswithQuickClick™endclips.
• SST™CrossTeeeliminatesthethree-stepprocessofcompetitivealternatives.
• The1496SeismicPerimeterClipexceedstheIBCrequirementfor2)ledgesupport.
1496SeismicPerimeterClip
SST™CrossTees
15/16)WallAngle
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> > > > PUSH TOWARDS < < < < < < < < PULL AWAY > > > >
Seismic Ceiling System Details
SST™ (Seismic Separation Tee)
ChicagoMetallic’sSST™SeismicSeparationTeeoffersaONE-stepprocesstomeetingIBCrequirements.Eachteehasonestaked-onstab-inendtabandanopposingelongatedintegralend.TheelongatedendsoftwoSSTsareinstalledonbothsidesoftheMainTeethathasbeendesignatedastheSeismicJoint,thenlockedinplacewithtwo(2)pushrivets.Inaseismicevent,seismicforcescausetheteestomovelinearly,thuseliminatingtheneedforaconventionalseparationjoint(seephotosbelow).
InadditiontothelaborsavedbygoingfromtheTHREE-stepprocessofreturningtotheassembledgrid,cuttingoffteeclips,andinstallingtwo-piecebrackets,theONE-stepSSTprocesseliminatestheneedformorechannels,wallangles,andadditionalhangerwires;doesnotinterferewithstruts,wires,orceilingpanels;helpskeepthegridsystemsquare,andpreservestheappearanceofthegridwork.
TheextendedintegraltaboftheSSTallowsittopushtowardsandpullawayfromthedesignatedseismicjointmainteeandmaintainastrongconnection.Thepushrivetsenablethejointtowithstandapulloutforceinexcessof180pounds.Theinternalfrictioninthejointalsoprovidesameasureofdamping.
elongatedintegralendtab staked-onstab-inendtab
designatedseismicjointmaintee
pushrivetslockeachSSTinplace
Toinstallsuspendedceilingsthatexceed2,500sq.ft.inseismiczones,theIBCrequiresseparationjointsthatallowcrossteestomovelaterallyduringaseismicevent.Traditionally,contractorscreatetheirownseismicsolutionsbyassemblingthegridandthenrevisitingtheassemblytocutthegridandbuildupconventionalseparationjointswithtees,channels,andangles.Thegridisthenstabilizedwithadditionalhangerwires.Inadditiontoincreasedmaterialcostsandtimeonthejob,thismulti-stepprocessrisksincurringdelayswhiletheconstructionmethodisinspectedandapproved.
Competitivealternativestothismethodincludeinstallingatwo-piecebracketatmain/crossteeintersections.Thissolutionrequiresthecontractortoinstallthegrid,thenreturntothegrid,cutoffthecrossteetabs,andattachthebracketwithscrews.WhilethesystemmaymeetIBCrequirements,itisaTHREE-stepcomponentandlaborintensiveprocess.
TheChicagoMetallicSST™istheonlyproductavailableinthemarkettodaythathasbeenbothtestedattheStateUniversityofBuffaloandreviewedbyanindependent,internationally renowned structural engineering group to be a viable solution forcreating seismic separation joints in IBC seismic design categories D, E and Finstallations.
Conventional Seismic Separation Joint
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IBC Seismic Catagory C
A-1> <A-2 B-1> <B-2
UNATTACHEDWALL
UN
ATTA
CH
EDW
ALL
UN
ATTA
CH
EDW
ALL U
NATTAC
HED
WALL
UN
ATTACH
EDW
ALL
UNATTACHEDWALL
UNATTACHEDWALL UNATTACHEDWALL
Conventional IBC Installation CMC 1496 Clip Installation (ESR-2282)
3/8)
3/8)
SpacerBar7/8)Min.
SpacerBar 7/8)Min.
3/8)Min.
3/8)Min.
15/16)Angle1496Clip
1496Clip15/16)Angle
A-1
A-2
B-1
B-2
* LEGEND
• –12ga.hangerwire
–HorizontalRestraint(Refertoillustrationonpage11)
–SpacerBar
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IBC Seismic Catagories D, E and F
C-1> <C-2 <D-3
D-1or
D-2>
(usethisoptionorD-2below)
(usethisoptionorD-1above)
ATTACHEDWALL ATTACHEDWALL
ATTA
CH
EDW
ALL
ATTA
CH
EDW
ALL
UN
ATTACH
EDW
ALL
UN
ATTACH
EDW
ALL
ATTACHEDWALL
UNATTACHEDWALL UNATTACHEDWALL
Conventional IBC Installation CMC 1496 Clip Installation (ESR-2282)
8)Max.
8)Max.3/4)
SpacerBar 2)Min.
8)Max.
15/16)Angle
PopRivet
15/16)AngleScrew
1496Clip
15/16)Angle
1496Clip
3/4)fromgridtoinsideofangle
2)Min.
PerimeterWire±10°fromvertical PerimeterWire
±10°fromvertical
PerimeterWire±10°fromvertical
PerimeterWire±10°fromvertical
PopRivet
Screw
C-1
C-2
D-1
D-3
D-2
12(O.C. 6(max.
12(O.C.
6(max.
12(O.C. 6(max.
12(O.C.
6(max.
* LEGEND
• –12ga.hangerwire
–HorizontalRestraint(Refertoillustrationonpage11)
–SpacerBar
PopRivet
PerimeterWire±10°fromvertical
8)Max.
8)Max.
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Seismic Separation Joint
IBC Seismic Catagories D, E and F
Conventional IBC Installation CMC SST™ Installation
1-1/2)
1448Channel 1448Channel
1428Angle DesignatedSeismicSeparation
SST™ElongatedIntegralEnds
SeismicJoint SSTrowstoeithersideofdesignatedseismicjoint
PushRivets
12(O.C.
12(O.C.
12(O.C.
12(O.C.
12(O.C.
12(O.C.6(O.C.max
6(O.C.max
* LEGEND
• –12ga.hangerwire
–HorizontalRestraint(Refertoillustrationonpage11)
–SST
IMPORTANT! Do not place horizontal restraint over separation joint.
E> <F
E F
12(O.C.
12(O.C.
12(O.C. 12(O.C.
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Seismic Horizontal Restraint
Thesehorizontalrestraintpointsshallbeplaced12(O.C. inbothdirectionswith thefirstpointwithin6(ofeachwall.BraceWiresshallbeattachedtoMainTeeswithin2)ofCrossTeeintersection,atamaximumangleof45°relativetoceilingplane.Wiresshallbetiedwithaminimumofthreetightwraps(seeASTMC636forexamples).
Forcompletedetails,pleaserefertothecurrentversionofASCE7.
Vertical Struts — Allowable LengthsMaximum Recommended Length for Vertical Struts1
EMT Conduit
1/2)EMT..........................................upto5(10)
3/4)EMT............................................upto7(8)
1)EMT...............................................upto9(9)
Metal Studs
Single1-5/8)metalstud(20gauge).................. upto12(0)
Single2-1/2)metalstud(20gauge).................. upto13(6)
Back-to-back1-5/8)metalstud(20gauge)....... upto15(0)
Back-to-back2-1/2)metalstud(25gauge)....... upto15(0)
Note:Plenumareasgreaterthan15(0)willrequireengineeringcalculations.
1Source: Northwest Wall & Ceiling Bureau Rev. 4/07
12ga.hangerwiretypical4(O.C.
VerticalPost
12ga.bracewiresconnectedtoMainTee
45°max
45°max
45°max
45°max
Literature Disclaimer: Presentations in this brochure or any other Chicago Metallic Corporation publication are correct to the best of our knowledge at time of preparation. We provide this information in an advisory capacity only. Any advisory recommendations given in our publications must be modified to conform with local codes, conditions and specifications. We reserve all rights to amend any information published in our literature without additional notice. Chicago Metallic can not be held responsible or liable for the selection nor application of our products.
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