Seismic Bracing Systems - Power-Strut

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PS0812 US Siezmic Cvr.qxd12/12/085:09 PMPage 2Seismic Bracing SystemsElectrical/Mechanical Uses Seismic Load Specifications Load & Horizontal Load Schedules Design Tables Bracing Channel, Fittings, &Accessories Images Through January 2009Electrical Infrastructure Solutions

PS0812 US Siezmic Cvr.qxd12/12/085:09 PMPage 3The Power to Handle Seismic LoadsThe present line of Power-Strut continuous slot metalframing is the result of over one half century ofexperience in metal framing.This complete line includes channels, finishes, fittings andaccessories for any framing or support solution.large or small, heavy or light.Power-Strut is proud of the exacting standards ofresearch, design, engineering and manufacturing thatgo into production of the Power-Strut system.Maximum recommended load ratings for channels havebeen established through testing and are based onallowable stresses applicable to the Power-Strut MaterialSpecification. Electrical Power-Strut products are listedby the Underwriters' Laboratories, Inc. (U.L.) andcertified by the Canadian Standards Association (CSA.)

23 121 33529(' 3 *(6Some of the pages in this book are pending approval by OSHPD. They have been signed by the Structural Engineerand have been submitted but are awaiting review. Many of the approvals awaiting review need corrections and for thisreason OSHPD is checking what they have approved before they approve new items even though many of those maybe corrections to a previous approval.i thru iv: The page numbers changed for this series of pagesiv: Added Fv notation and changed s to sc5 and 6: New seismic table informationA1 and A14: The OSHPD approved pages may still be rejected by the SEOR as it does not include vertical seismicrequired by the CBC. The submitted, but not OSHPD approved pages meet the OSHPD requirement and the Code.A12 and A13: Changed component names to comply with MSS SP-58 Type numbersB1: The page added closer rod stiffener spacing where compression loads may exceed L/r 200. This is especiallyimportant when using other OSHPD pre-approvals where compression loads have been ignored when using cable forbrace material.B4: Retrofit fittings use our sister company’s pre-approval.B5 and B6: Allowable loads for pipe clamps used a factor of 5 in order to cover all piping applications in accordancewith MSS standards at that time. However, we did not print safety factors used for our products in the approval.Since then there is a proposal to change the standard. And OSHPD has approved these type clamps with a safetyfactor of 3.5. To convert to a safety factor of 3.5 multiply the approval by 5 and divide by 3.5.Example: 200 pound rating x 5/3.5 286B7: Changed component name to comply with MSS SP-58 Type numberB9: The PS 680 has been modified to meet the OSHPD requirement and renumbered to PS 681.C1: The math has been clarified to allow other brace patterns including cable. Since cable can only be used fortension bracing two opposing cables are required wherever a single rigid brace may be used.C2: This is somewhat redundant to C1 but includes a layout for the differing brace patterns.NOTES REGARDING SAFETY FACTORSSafety factors vary by product depending on the intended use. OSHPD requires safety factors for some products. Forexample, for a wedge anchor that has not been tested for cracked concrete OSHPD requires a safety factor of 10 inthe tension zone (generally the underside of a slab). For cable the OSHPD guidelines have been an industry standardof 5 unless pre-stressed where they allow a safety factor of 3. On one approval OSHPD has approved cable with asafety factor barely more than 2 (must be pre-stressed) based on the testing submitted for that approval.Note: Gray shading behind items that have changed since OSHPD approved the page.

MemorandumTo:All FDD StaffFrom:John D. Gillengerten, S.E.Deputy DirectorSubject:2007 CBC and Use of Existing Pre-ApprovalsState of CaliforniaDate:April 22, 2008Until further notice, existing OSHPD anchorage pre-approvals (OPA) may be usedon projects subject to the 2007 California Building Code (CBC) without modification.All aspects of the design and installation of the pre-approved component or system,including computation of the lateral forces, shall be in accordance with the approvedOPA.OSHPD Pre-Approval UsageThe use of the Pre-Approvals, now designated as “OPA” numbers are valid for projects submitted to OSHPDafter November 1, 2002 and designed to the requirements of the 2001 CBC. Either the manufacturer or the listedengineer must be contacted for copies of the Pre-Approval for your use. Copies of the Pre-Approval details mustbe on the job site prior to starting the installation of the component or system.OSHPD does not currently enforce expiration dates. All Pre-Approvals are valid regardless of expiration date.Specifying Pre-Approved systems does not preempt the Building Permit process. Contract documents shall besubmitted to OSHPD for review and approval and issuance of a Building Permit prior to construction occurring.Go to for additional informationTuesday, August 26, 2008

7 %/( 2) &217(176OSHPD PRE-APPROVAL INFORMATION.TABLE OF CONTENTS .DESIGN TABLESPipe Data.C1Brace Design.C2PREFACE .iINTRODUCTION .iiGLOSSARY. iiiBrace Location Requirements .C3Hanger Load Table .C4Seismic Force Graph .C5Trapeze Load Tables.C6NOTATIONS . ivGENERAL INFORMATIONLateral Force Design .1Lateral Force Design Sample .2Concrete Expansion Anchor Load Table .C8Concrete Expansion Anchor Test Specification . C10Floor Mounted Equipment With Hung Pipe/conduit .C11ANCHORAGEMaterial Specification .3Steel. D1Seismic Table Use Procedure .4Concrete . D2Single Pipe Seismic Table.5Wood. D3Trapeze Seismic Table .6SEISMIC BRACING SYSTEMSAPPENDIXComponent Index. R1Trapeze Selection Procedure and Sample Problem.A12000 International Building Code. R2Trapeze Assembly.A5N.F.P.A. Pipe Data. R3Single Pipe Hanger Selection Procedure and Sample Problem.A7Electrical Metallic Tubing Data . R4Single Pipe Hanger Assembly.A12Conduit Spacing. R5Single Pipe Hanger Load Table .A13Conduit Data . R6Single Pipe Hanger Brace/clamp.A14Steel Pipe Data. R7COMPONENTSHanger Rod with Stiffener .B1Fasteners .B2Angle Connectors .B3Hinge Connectors .B4One Piece Pipe Clamp.B5Two Piece Pipe Clamp .B6One Bolt Steel Lug.B7Concrete Insert .B8Beam Clamp .B10Channel Properties .B11Copper Tube Data. R8PVC Data. R10Hanger Spacing For PVC Plastic Pipe . R11Hot Rolled Steel Load . R12

35() &(These guidelines were developed using sound engineeringprinciples and judgment. They represent realistic and safedetails compatible with the general guidelines and force factorsin the State of California Code of Regulations, Title 24, alsoreferred to as the California Building Standards Code. Materialcontained in this publication is for general information only andcan be referenced in the 2001 California Building Code basedon the 1997 Uniform Building Code. Anyone making use of thedata does so at his own risk and assumes any and all liabilityresulting from such use. ALLIED ELECTRICAL Groupdisclaims any and all express or implied warranties of fitness forany general or particular application.A copy of this Seismic Bracing catalog showing the properSeismic Brace tables (Pages 5 & 6) and Brace LocationRequirements (Page C3) along with the Power-Strut Engineering catalog shall be on the jobsite prior to startingthe installation of the seismic bracing system.The Seismic Tables defined in Pages 5 & 6 are for a seismicfactor of 1.0g and can be used to determine brace location,sizes, and anchorage of pipe/duct/conduit and trapezesupports. The development of a new seismic table isrequired for seismic factors other than 1.0g and must bereviewed by OSHPD prior to seismic bracing. For OSHPD,these documents can be considered a change order inaccordance with Part1, Title 24, CBC.TITLES U B M I T T E DPrefaceOPA-0242, Rev 1JOSEPH L. LA BRIEStructural EngineerNo. SE 356655 E Huntington DrSuite 277Arcadia, CA 9100623 5HY 26 3' 6XEPLWWHGPAGEiDATE04/21/20053RZHU 6WUXW 6HLVPLF &DWDORJ

,1752'8&7,21Power-Strut Seismic Bracing Systems are designed andconstructed to resist virtually all code specified seismic forcesin the event of an earthquake; therefore, keeping non-buildingstructural components of hospitals and other essential facilitiesoperational and intact.Seismic bracing shall not limit the expansion andcontraction of systems; the engineer of record shallascertain that consideration is given to the individualdynamic and thermal properties of these systems andthe building structure. Proper seismic & thermal jointsshould be provided as directed by the project engineer.The details and schedules presented do not include theweights from branch lines. All fire sprinkler branch linebracing shall comply with the requirements of the currentedition of the NFPA-13. The project engineer mustverify the additional load from branch lines are within theallowable capacity of the bracing details.Essential facilities are those structures, which arenecessary for emergency post-earthquake operations.Such facilities shall include, but not be limited to:Hospitals and other medical facilities having surgeryor emergency treatment areas; fire and policestations; municipal government disaster operationand communication centers deemed to be vital inemergencies.Actual applications may vary and are not limited tosupport methods shown. However, any changes to thesupport methods, hardware and designs depicted inthese guidelines should only be made in accordance withstandard engineering practices by a qualified registeredengineer and shall be approved by California Office ofStatewide Health Planning and Development (OSHPD) orgoverning agency.Power-Strut bracing systems designed per thecatalog requirements do not guarantee adequacy ofexisting structures to withstand the loads inducedby the seismic attachments. It is the responsibility ofthe project engineer to verify that the structure is capableof supporting any and all items constructed using theseguidelines. It is the responsibility of the project engineerand the installer to determine the adequacy of placementand installation in regards to these guidelines includingcompliance with all applicable codes.Where possible, pipes and conduit and their connectionsshall be constructed of ductile materials [copper,ductile iron, steel or aluminum and brazed, or weldedconnection]. Pipes and their connections, constructed ofother material, e.g. cast iron, no-hub pipe and threadedconnections, shall have the brace spacing reduced toone-half of the spacing for ductile pipe.Pipes, ducts and conduit supported by a trapeze wherenone of those elements would individually be braced neednot be braced if connections to the pipe/conduit/ductworkand directional changes do not restrict the movement ofthe trapeze. If this flexibility is not provided, bracing willbe required when the aggregate weight of the pipes andconduits exceed 10 lb/ft.TITLES U B M I T T E DIntroductionOPA-0242, Rev 1JOSEPH L. LA BRIEStructural EngineerNo. SE 356655 E Huntington DrSuite 277Arcadia, CA 91006PAGEiiDATE04/21/2005

*/266 5 Grade – Ground level of building; referred to as 0 ftelevation.Run – Direction of pipe layout, along the axis of the pipe.Strength Design – For load and resistance factordesign; ultimate load (design for most critical effects ofloads)Lateral Brace – A generic term used to describe abrace that resists lateral forces in the longitudinal andtransverse direction.Lateral Force – Force acting on a component or elementthat is positioned across, perpendicular, or at a 90 angleto its vertical.Sway Brace – A mechanical device used for resistinglateral forces.Transverse– Direction perpendicular to the horizontal ofa component or element's run.Longitudinal– Direction along the horizontal of acomponent or element's run.Trapeze – Part of an assembly used to help resistseismic forces.Shallow Anchors – Anchors with an embedded length todiameter ratio of less than 8.Working Stress – Allowable load used for design; factorsdown strength design loads, providing a safety factor.TITLES U B M I T T E DGlossaryOPA-0242, Rev 1JOSEPH L. LA BRIEStructural EngineerNo. SE 356655 E Huntington DrSuite 277Arcadia, CA 9100623 5HY 26 3' 6XEPLWWHGPAGEiiiDATE04/21/20053RZHU 6WUXW 6HLVPLF &DWDORJ

127 7,216ap – Component Amplification Factor.Fx – Horizontal transverse brace earthquake loadperpendicular to Fy.ASME – American Society of Mechanical EngineersASTM – American Society for Testing MaterialsFy – Transverse brace earthquake load perpendicular toFx.Ca – Seismic – Structure roof elevation with respect to grade.CL – Longitudinal Clamp Capacityhx – Equipment attachment elevation with respect tograde (not less than 0.0).CT – Transverse Clamp CapacityIp – Seismic Importance Factor.Fb – Transverse brace earthquake load along bracelength.LB – Distance from one angle fitting to another on atrapeze.FbALLOW – Allowable Brace Force.FHL – Longitudinal Horizontal Force; force alonghorizontal run of pipe. (FHL FpxS3)LT – Distance from one threaded rod to another on atrapeze.NFPA – National Fire Protection AssociationFHL ALLOW - Allowable longitudinal horizontal force as permanufacturer's testing.FHT – Transverse Horizontal Force; force perpendicularto horizontal run of pipe. (FHT FpxS2)PS – Power-StrutRp – Component Response Modification – seismic coefficient used to define the following;Fp – Lateral force on a part of the structure; designseismic force (strength design).Fp - Lateral force on a part of the structure factored toWorking Stress level; design seismic force (WorkingStress).sc a Ca IpRp1 3hxhrS1 – Hanger spacingS2 – Transverse brace spaceFROD – Rod axial force.S3 – Longitudinal brace spaceFV – Vertical Seismic (FV). Vertical acceleration from aseismic event and may be up (uplift) or down(FV 33% * FHT * S1/S2)Wp – Weight of element or component.Wt – Total WeightTITLES U B M I T T E DNotationsOPA-0242, Rev 1JOSEPH L. LA BRIEStructural EngineerNo. SE 356655 E Huntington DrSuite 277Arcadia, CA 91006PAGEivDATE04/21/2005

*(1(5 / ,1)250 7,21The following defines the total design lateral seismic force, Fp, as described in Chapter 16A of the 2001California Building Code (CBC). The values of the following coefficients have been determined to providea safe approximation to use as a design lateral force. The Engineer of Record shall qualify for thecalculation of the seismic force as needed, see sample problem on the following page.Fp a pCa I pRp1 3hxW p scWphrThis is not part of the approved page. SpecificationChanged with Oct. 12, 2006 AmendmentFp a pCa I p1 2RphxW p sW phrap 1.0in-structure Component Amplification Factor:For plumbing equipment and associated piping, necessary for the continuing operation ofessential service buildings (Table 16A-O, 2001 CBC).Ca 0.66Seismic Coefficient (.06 to .66):0.66 derived from Table16A-Q of the 2001 CBC; knowing the seismic zone (Z) to be 4,having a stiff soil profile type (SD), and a Type A seismic source having large magnitudesand slip rates, which results in a near source factor (Na) of 1.5. (refer to Tables 16A-S,16A-J, 16A-I, & 16A-U)Ip 1.50Seismic Importance Factor:For essential facilities with occupancies having surgery and emergency treatment areas(Table 16A-K, 2001 CBC).Rp 3.0Component Response Modification Factor:3.0 for plumbing equipment, associated piping and/or anchors with an l/d 8, necessaryfor the continuing operation of essential service buildings.1.5 for shallow anchors with an embedded length-to-diameter ratio of less than 8.Adhesive or non-ductile anchors are not allowed when using the tables in this book.hx Equipment attachment elevation with respect to grade (not less than 0.0).hr Structure roof elevation with respect to grade.Limits to this lateral seismic force: 0.7Ca IpWp a Fp a 4Ca IpWp.The use of Fp in this catalog necessitates a conversion from strength design of the seismic force to workingstress of the seismic force. Thus, Fp(strength design) 1.4 Fp(working stress).TITLEA P P R O V E DFixed Equipment AnchorageOffice of Statewide Health Planning and DevelopmentLateral ForceDesignOPA-0242 Apr 25, 2003**** Valid for 3 Years Maximum ****JOSEPH L. LA BRIEStructural EngineerNo. SE 356655 E Huntington DrSuite 277Arcadia, CA 91006PAGE1DATE04/25/20033RZHU 6WUXW 6HLVPLF &DWDORJ

*(1(5 / ,1)250 7,21A 3-story building, 40' high, will have piping suspended above the ceiling of the first floor at an elevation of 20'from grade. The building is in California located on seismic zone 4 with a soil profile of Sc. The nearest proximityto a known seismic source is less than 1 mile (approximately 1.6 km) and has a seismic source type A.Solution:1) Rp 3.0Ca 0.6hx 20'hr 40'Fpa pCa I p h ³20 ³1.0 r 0.6 r 1.5 1 3 x W p 1 3 W p 0.75W pR p h

The Seismic Tables defined in Pages 5 & 6 are for a seismic factor of 1.0g and can be used to determine brace location, sizes, and anchorage of pipe/duct/conduit and trapeze supports. The development of a new seismic table is required for seismic factors other than 1.0g and must be reviewed by OSHPD prior to seismic bracing. For OSHPD,

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