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Specifications . ,,e31-(4°02a 0(0/(7 7 1 . . 95 3 F Glia L5b i ( h • Orange Tree Yogurt --')- Washington Square ��,�� co, , �� 9585 SW Washington Square Road #H14 ° Tigard, Oregon 97223 Structural Engineering Calculations f P t , / - ' Ti 1- � ; �, 4 4 b - * ✓ • ._GQ:d , For Kim Architecture 7415 Lake Ballinger Way Edmonds, Washington 98026 By Dihong Shao, PE, SE August 10 2009 • Engineering Calculations Seismic Design Parameters Zip Code 97223 Latitude: 45.44033 site class D Longitude: - 122.7762 (If no soil report, use D) S = 106.142 %g , S ins = 1.141 g , F = 1.075 S 37.165 %g,S 0.616 g, F„= 1.657 SOS = 0.761 g , Sol = 0.410 g - Grid Ceiling Support Bracing and compressing struts at 12' -0" on center each way ceiling framing weight = 5 psf seismic mass = 12'x12'x5 psf = 720 lbs Fp = 0.4apSdsWp /[Rp /Ip](1 +2 *(z/h))= 0.4x2.5x0.761x720/(2/1)(1 +2x(0.5))= 528 lbs Fp Min= 0.3SdslpWp = 0.3x0.761x1x720= 164 lbs Fp Min= V = CsW = 0.381x720= 273 lbs where; [Cs= Sds/[R/I]]= 0.761/(2/1) =0.381 tension wire forces = 1.414x528 = 747 lbs compression strut forces = 528 lbs tension wire 12 gage with wire loop to the roof joist top panel points compression strut minimum (2) -3- 112 "x20 gage back to back stud Partition Wall Bracing forces on partition= 5 psf forces at bracing at 4' -0" on center =1.414x5psfx4'x12' /2= 170 lbs 3 -1/2 "x20 gage stud Soffit and Store Front - store front weight (average seismic mass) 20 psf mimimum forces on store front= 5 psf or - Fp = 0.4apSdsWp /[Rp /Ip](1 +2 *(z /h))= 0.4x2.5x0 .761/(3/1)(1 +2x(0))Wp= 0.254Wp 5.1 psf Fp Min= 0.3SdslpWp = 0.3x0.761x1x2Opsf= 4.6 psf Fp Min= V = CsW = 0.254xW= 0.254x20psf 5.1 psf where; [Cs= Sds/[R /l]]= 0.761/(3/1) =0.254 Full height tube steel w= 5psfx8'= 40 plf M= (1/8)x40plfx20'x20' 2 kip-ft S= 0.51x2 1.02 inA3 1= (600/360)x0.186x2x20' 12.4 in "4 HSS4x4x1 /4 Header tube steel w= 40psfx6'= 240 plf M= (1/8)x240plfx8'x8' 1.92 kip -ft S= 0.51x1.92 0.98 inA3 1= (600/360)x0.186x1.92x8' 4.76 in "4 HSS4x4x1 /4 FIELD TECHNICAL INFORMATION Application recommendations for work at the wall or ceiling 401 Suspension Systems for OREGON REVISED 4/07 Acoustical Lay -in Ceilings This document has been reviewed by the State of Oregon, Building Codes Division. In all buildings, other than structures classified as occupancy category III and IV, suspended ceilings installed in accordance with the prescriptive provisions of the 401- OREGON document are deemed by the State of Oregon, Building `�► • Codes Division to comply with the statewide code interpretation. \� This document provides the IBC- referenced standards for the instal- „ lation of suspension systems for General Recommendations • Referenced sources per hierarchy: 2006 IBC (International Building Code), acoustical lay - ceilings. Incorpora American Society of Testing Materials (ASTM C 635, ASTM C 636), Ameri- _ tion of this document will provide a can Society of Civil Engineers (ASCE 7 -05) and Ceilings and Interior Systems Construction Association (CISCA). more uniform standard for installation • Partitions that are tied to the ceiling and all partitions greater than 6 feet in and inspection. This document is height shall be laterally braced to the structure. Bracing shall be independent of the ceiling splay bracing system. Sot erce IBC section 1621.1.2 designed to accomplish the intent of • For further information on bracing of non - load bearing partitions refer to the International Building Code (IBC) NWCB technical document #201. with regard to the requirements for • Al main beams are to be Heavy Duty (HD). Scarce ASCE 7 -05 item 9.6 2 6.2.2a seismic design category D, E and F for • All cross tees shall be capable of carrying the design load without exceeding deflection equal to 1/360 of its span. SuuGo coca zones 3 -4 suspended ceilings and related items. • These recommendations are intended for Unless supported by engineering, the suspended ceilings including grid, panel or tile, light fixtures and air terminals weighing suspension system shall be installed no more the 4 lbs. per square foot. Source ASCE 7-05 item 9.6.2.6.1 per the requirements for Seismic De- � t maximum 3° • All wire ties are to be three tight turns sign Category (SDC) D, E and F per (Ism m) around itself within three inches. Twelve the IBC. Manufacturers' recommen - r gage Hanger wire spaced 4 foot on center Illl (figure 1). Source ASTA/1 C 636 item 2.3 4 dations should be followed. - • Changes in ceiling planes will require posi- tive bracing. figure 1 Source ASCE 7 -05 Section 9, 6.2 6 2 2 '(ern i NORTHWEST WAIL & CEILING BUREAU SUSPENSION SYSTEMS FOR ACOUST'CAL LAY - iN CEILINGS figure 2 Lateral Force Bracing (figures 2 and 3) ' Lateral'force Bracing • Ceilings constructed of lath and plaster or gypsum board, screw or nail attached to suspended members that support a ceiling on one level extending from wall to wall shall be exempt from the lateral force bracing requirements. Source CISCA zones 3 4 li 45° or less 45• or less • Lateral force bracing is the use of vertical struts (compression posts) and splay wires (see figure 2). Y • Lateral force bracing is required for ceilings over 144 square feet and not a y �� 1 2 gage required for ceilings less than 144 square feet provided they are surrounded by � / s la 4s• or less ‹ /'� ' brace four walls and braced to structure. Source: State of Oregon, Building Codes Drvsion j 45• or less wires • Lateral Force Bracing shall be 12 feet on center (maximum) and begin no farther than 6 feet from walls. Source CISCA Seismic zones 3 -4 - Cross tee Main beam Seismic splay wires are to be four 12 gage wires attached to the main beam. Wires are arrayed 90° from each other and at an angle not exceeding 45° from the plane of the ceiling. Source' CISCA Seismic zones 3 -4 figure 3 • Seismic splay wires shall be attached to the grid and to the structure in such Maximum Recommended Lengths for a manner that they can support a design load of not less than 200 pounds or Vertical Struts the actual design load, with a safety factor of 2, whichever is greater (figure 6b). Source: CISCA zones 3 -4 EMT CONDUIT • Powder driven shot -in- anchors" when used for seismic application as part of 1/2" EMT conduit up to 5'10" the prescriptive path in Seismic Design Categories D, E and F shall have an ICC -ES approval for seismic applications and shall require "special inspection" 3 /4" EMT conduit up to 7' 8" irrespective of the type of occupancy category the structure is in. Anchors for 1" EMT conduit up to 9' 9" kicker wires (splayed wires installed for purposes other than seismic restraint) are exempt from this requirement. Sourco: State of Oregon, Budding Codes Division METAL STUDS • Splay wires are to be within 2 inches of the connection of the vertical strut to suspended ceiling. Source. CISCA Seismic zones 3 -4 Single 1 /e" metal stud (20 gauge) up to 12' 0" Rigid bracing may be used in lieu of splay wires. Source ASCE aeot ;vn 9.6 2 6.2.2 • Back -to -back 1 /a" metal stud up to 15'0" • Ceilings with plenums less than 12 inches to structure are not required to have (20 gauge) lateral force bracing. Source. Port /and Building Department Single 2'/2" metal stud (20 gauge) up to 13' 6" • Vertical struts must be positively attached to the suspension systems and the structure above. source. CISCA 3 -4 Back-to-back 2 %2" metal stud up to 15' 0" The vertical strut may be EMT conduit, metal studs or a proprietary compression (25 gauge) post (see figure 3). Source: Portland Building Department Wall Moldings (figures 4a and 4b) - Note. Plenum areas greater than 15'0" will require engrneenng ca,cutai,ons. • Wall moldings (perimeter closure angles) are required to have a horizontal flange 2 inches wide. One end of the ceiling grid shall be attached to the wall mold - figure 4a ing, the other end shall have a 3 /4 inch clearance from the wall and free to slide. Attached Wall Molding Requirements Source: ASCE 7 -05 section 9.6.2 6 2 2 item b 7.. • Where substantiating documentation has been provided to the local jurisdiction, / perimeter clips may be used to satisfy the requirements for the 2 -inch closure m etlm o, e' (2e2 mml WALL angle. Source State of Oregon. Building Codes Division • The grid shall be attached at two adjacent walls (pop rivets or approved method). 0 %0 Soffits extending to a point at least level with the bottom plane of the grid and U 1),, independently supported and laterally braced to the structure above are deemed /w ... J to be equivalent to walls. Sources: sate of Oregon, Buy /ding Codes Dyson 2' non) ,� -' `4 U-o, • There shall be a minimum 3 /4 inch clearance from the end of the grid system at � un- attached walls. Source: ASCE 7 -05 section 9.6.2.6.2.2 ;ten b figure 4b Spreader Bars (figure 4b) Unattached Wall Molding Requirements • Spreader (spacer) bars shall be used to prevent the ends of the main beams and cross tees at perimeter walls from spreading open during a seismic event. Perimeter wires shall not be in lieu of spreader bars. Source* CISCA Seismic zones 3 -4 WALL ma,<Impm e•,' mm' • Spreader bars are not required at perimeters where runners are attached directly to closure angles. ° • p . ' o Spreader bar or • Wire tying is an acceptable alterative to spreader bars. other imitable O 4).. sy steep em requirpedmlter ed to • k from • Spreader bars are not required if a 90 degree intersecting cross or main is within y components fro m, Imam �J s preading app 8 inches of the perimeter wall. 2' mm) 's al unattached walla s^ ` I .o� • Where substantiating documentation has been provided to the local jurisdiction, so.. perimeter clips may be used to satisfy the requirements for spreader bars. Source. State of Oregon, Building Codes Division NORTHWEST WAI t. S CES LNG BUREAU • SUSPENSION SYSTEMS FOR ACOUSTICAL LAY-.NI CEILINGS • Hanger (Suspension) Wires (figures 5a and 5b) figure 5a plumb lie • Ha and perimeter wires must be plumb within 1 in 6 unless (figure 5a) counter sloping wires are provided (figure 5b). Source: AS rm C 636 section 2.1 4 • Hanger wires shall be 12 gage and spaced 4 feet on center or 10 gage spaced 5 . feet on center. source: nsrM c 636 • Any connection device at the supporting construction shall be capable of carrying - °— meWnum B' 1. not less than 100 pounds. Source: CISCA zones 3 -4 • Powder driven shot -in- anchors are an approved method of attachment for hanger wires. Source' State of Oregon. Building C cces Division • Terminal ends of each main beam and cross tee must be supported within 8 inches of each wall with a perimeter wire (see figure 4 & 5 b). Source: CISCA zones 3 -4 • Wires shall not attach to or bend around interfering material or equipment. A figure 5b • Countersioping _ trapeze or equivalent device shall be used where obstructions preclude direct suspension. Trapeze suspensions shall be a minimum of back -to -back 1 inch r\ \ cold rolled channels for spans exceeding 48 inches. Source: c/sc.� =manes 3 4, 7 Electrical fixtures ' minimum N'` minimum as enpb /I a 5•eigb '; • Light fixtures weighing less than 10 pounds shall have one 12 gage hanger wire i _' _ , connected from the fixture to the structure above. This wire may be slack. source — —_ ___�__ _____ CISCA Seismic tomes 3 4 . • Light fixtures weighing more than 10 pounds and less than 56 lbs. shall have two 12 gage wires attached at opposing corners of the light fixture to the structure above. These wires may be slack. source. CiSCA Seismic zones 3 -4. • Light Fixtures weighing more than 56 lbs. shall be supported by directly from the figure 6a structure above. These wires must be taut. Source: C/SCA Seismic =ones 3 -4 Vertical hanger wire attachment • Pendant mounted fixtures shall be directly supported from the structure above using a 9 gage wire or an approved alternate support without using the ceiling Shot-in anchor in 3/4 • suspension system for direct support. source: ClscA Seismic Z01105 3 -4 Structural concrete t Ceiling clip 5/13 • Tandem fixtures may utilize common wires. g max Mechanical Services 3 turns . • Terminals or services weighing 20 lbs. but not more than 56 lbs. must have two 12 gage wires connecting them to the ceiling system hangers or the structure Vertical hanger wire above. These wires may be slack. Source. CiSCA Seismic =ores 3-4 - • Terminals or services weighing more than 56 lbs. must be independently sup- figure 6b ported directly from the structure above. These wires must be taut. Source: CiSCA Splayed seismic bracing wire attachment Seismic zones 3 -4 drill -in expansion anchor - Uri Seismic Separation Joints (figure 7) ' • For ceiling areas exceeding 2,500 square feet, a seismic separation joint or full Structural concrete g as° height wall partition that breaks the ceiling shall be provided unless analyses are Steel strap 1 • wide x 2' long x performed of the ceilings bracing system, closure angles and penetrations to 12 gage minimum provide sufficient clearance. S ootce. ASCE 7 -O� item 2 3 turns p tem9.G.26.' �d Splayed seismic bracing wire • The layout and location of the seismic separation joint shall be per the designer of record and noted on the plans. If a seismic separation joint is required by the designer, the designer may use the generic joint detailed in this document or a proprietary joint. The amount of free movement (gap design) shall be a minimum figure 7 of N inch. Source. State of Oregon. Building Codes DMsion • In lieu of seismic separation joints, the ceiling may be divided into areas less than 1 2500 square feet by the use of partitions or soffits as follows: partitions shall extend a minimum of 6 inches above the level of the plane of the grid and shall be inde- 5 ti pendently braced to the structure above. Soffits shall extend to a point at least level I I 1 � with the bottom plane of the grid and shall be independently supported and laterally ll i 11111.1 braced to the structure above. Source State of Oregon Building Codes Division • Other than partitions and soffits, seismic joints may not be used as part of a fire . . rated ceiling assembly unless substantiating documentation is provided. Source i : - State ofCiegon Building Codes Division `_ Flange 3/4 Pop minimum Rivet NORTHWEST WAL 1 & CEILING (3URFAU • SUS °ENSIGN SYSTEMS FOR ACOUSTICAL LAv IN CEII INGS Sprinklers For ceilirigs without rigid bracing, sprinkler head penetrations shall have a 2 inch oversize ring, sleeve or adapter through the ceiling tile to allow free movement of at least 1 inch in all horizontal directions. Rexible head design that can accommodate 1 inch free movement shall be permitted as an alternate. Source ASCE 9 9 6 2.6 2.2 itcrn GLOSSARY FOR THIS DOCUMENT (regional terminology may vary) CROSS TEES LATERAL FORCE BRACING PERIMETER WIRES The cross member that interlock with the The bracing method used to prevent ceil- Hanger wires placed within eight inches of main bean also known as cross runners ing uplift or restrict lateral movement during the surrounding walls. or cross T -bars. a seismic event. Lateral force bracing consists of vertical struts and splay wires. PLENUM DIFFUSER The space above a suspended ceiling. A circular or rectangular metal grill used MAIN BEAM for the passage of air from a ducted The primary suspension member sup- SLACK WIRE system. ported by hanger wires, also known as the A 12 gage wire that is not tight or taut. main runner, carrying tee, carrying runner SPREADER or SPACER BAR ESSENTIAL SERVICE BUILDINGS or mains. Any buildings designed to be used by A bar with notches to prevent the suspen- public agencies as a fire station, MOLDING /CLOSURE ANGLE sion system from separating, also called a police station, emergency operations A light gauge metal angle or channel fas- stabilizer bar. center, State Patrol office, sheriff's tened to the perimeter wall or partition to SPLAY WIRES office, or emergency communication support the perimeter ends of an ac Wires installed at an angle rather than dispatch center. coustical ceiling grid. perpendicular to the grid. GRID PERIMETER CLIPS VERTICAL STRUTS The main beams and cross tees of the Proprietary angle bracket attached directly The rigid vertical member used in lateral suspension system. to the wall molding/closure angle which force bracing of the suspension sys allows for 3/4" movement in the event of HANGER WIRE seismic activity and interlocks properly with tem. Also known as compression posts, 10 or 12 gage soft annealed wire used as ends of grid system. seismic pods, seismic struts. Common primary support for the grid system. Also materials are electrical conduit (EMT), called suspension wires. metal studs or proprietary products. The NWCB has been serving the construction industry for over forty years. It is recognized as a technical authority, educational body and spokes - Nort� person for the wall and ceiling industry. It provides Wall and services to architects and the construction commu- Ceiling nity on all matters relating to the diversified wall and Bureau NWCB - Oregon ceiling industry. Phone: (503) 295 -0333 As the industry's development and coordination Fax: (503) 295 -2733 organization, the NWCB saw the need to establish 1032 -A NE 65th St. a document to provide clarification and the intent B.C. Wall and Ceiling Association of NEHRP (National Earthquake Hazards Reduction Seattle, WA 98115 Phone: (604) 597 -7180 Program) an agency of FEMA (Federal Emergency Phone (206) 524 - 4243 Fax: (604) 597 -7208 Management Agency). It is meant to serve as a set Fax (206) 524 -4136 of recommendations and is not intended for any Toll Free (800) 524 -4215 Alberta Wall and Ceiling Association specific construction project. info@nwcb.org Phone: (403) 250 -7045 The NWCB makes no express or implied warranty www.nwcb.org Fax: (403) 291 -9515 or guarantee. ALASKA • IDAHO • OREGON • WASHINGTON • ALBERTA • BRITISH COLUMBIA • SASKATCHEWAN ' Building Codes Division Statewide Code Interpretation Working with Oregonians .,, ,Ci' to ensure safe building ,.• construction while No 2004 OSSC Section 1621.1 and ,-.- , ., supporting a positive ,7 business climate. 2007 OSSC (effective on April 1, 2007) Section - 1613.1. 2004 OSSC Section 1621.1, 2007 OSSC Section 1613.1, Code Section: - ASCE 7 -02 Section 9.6.2.6 and ASCE 7 -05 Section 13.5.6.2.2 2004 and 2007 for OSSC's and Code Edition: 2002 and 2005 for ASCE Standard 7. Date: REVISED: April20, 2007 Subject: Construction requirements for Suspended Ceiling Systems. Question: What are the minimum requirements of the Oregon Structural Specialty Code for the construction of suspended ceiling systems? Answer: I. The following options are available: a. An engineered ceiling system designed for appropriate forces, - b. Prescriptive ceiling systems per CISCA standards as provided below, except for ceiling systems in structures classified as Occupancy category III or IV: i. in Seismic Design Category C, construction in accordance with CISCA standards for seismic zones 0 -2. All of the notes in section IV of this interpretation shall be applicable in addition to the CISCA requirements. ii. in Seismic Design Categories D through F, construction in accordance with CISCA standard for seismic zones 3 and 4 with modifications as noted in ASCE 7- 02 or ASCE 7 -05 standard. All of the notes in sections IV and V of this interpretation shall be applicable in addition to the requirements contained in ASCE 7- 02/05 or ASCE 7 -05 and the CISCA standards for Building Codes Division • Department of Consumer and Business Services • State of Oregon , 1535 Edgewater NW Salem, Oregon ♦ PO Box 14470 Salem, OR 97309 -0404 + �' � ; 503- 378 -4133 • TTY 503- 373 -1358 ♦ Fax 503- 378 -2322 • bcd.oregon.gov In accordance with OAR 918- 008 -0110, the information contained in this statewide code interpretation is IAA legally binding on any party involved in activities regulated by applicable Oregon law, applicable Oregon regulations or the state building code. If the information contained in this statewide code interpretation is cited as a basis for a civil infraction, a representative of the jurisdiction must cite the interpretation number found in this document. Seismic Design Categories D through F. c. Effective April 1, 2007, (with the adoption of the 2007 OSSC) the following two additional options will be available based upon ASCE 7 -05 Sections 13.2.5 and 13.2.6: i. Shake table testing of components and their supports, to determine their seismic capacities, in accordance with ICC Acceptance criteria 156. {Section 13.2.5 of the ASCE 7 -05. }, or ii. Seismic qualification by experience data based on nationally recognized procedures. {Section 13.2.6 of the ASCE 7-05.} II. Northwest Wall & Ceiling Bureau - Technical Bulletin 401 OREGON (NWCB TB 4010R): In structures other than those classified as occupancy category III or IV, suspended ceilings installed in accordance with the prescriptive provisions of NWCB TB 4010R are deemed to comply with this interpretation. NWCB TB 401OR contains information compiled from the different applicable documents such as ASCE Standard 7 -05, IBC 2006, ASTM Standard C635 and CISCA and is available at the following internet address: http://www.nwcb.org/imagestresource_files/401_0REGON.pdf All of the notes in sections IV and V of this interpretation shall be applicable in addition to the requirements contained in NWCB TB 4010R. III. The Seismic restraint for suspended ceiling systems in structures classified as Occupancy Category III and IV, are required to be designed for the specific project and the anchorage of the ceiling system is required to be periodically special inspected in Seismic Design Categories D, E, and F in accordance with the provisions of the current edition of the Oregon Structural Specialty Code. IV. GENERAL NOTES. The following notes are applicable to sections I and II: a. SPECIALTY CEILINGS. Specialty ceilings, must be installed using an engineered design and may not use the provisions of this interpretation. Specialty ceilings include but are not limited to those: i. Incorporating arched ceilings, curved or curvilinear ceilings or sloped ceilings; or ii. Having no direct connection to the surrounding walls or supports, such as "free floating" or "cloud" ceiling elements. b. TILES. Suspended ceilings installed to this interpretation may use either standard acoustical lay -in ceiling panels, tegular or kerfed ceiling panels. -2- c. SPREADER BARS. i. Wire ties are deemed equivalent to spreader bars ii. Spreader bars are not required if a 90 degree intersecting • cross or main is within 8 inches of the perimeter wall. iii: Spreader bars are not required at perimeters where • ceiling grid ends are attached to closure angles. d. WIRE GAUGE: The minimum wire size shall be US Steel Wire Gage #12 (0.1055 inch). V. Notes Specific to Design Categories D through F a. Lateral force bracing is required for ceilings over 144 square feet. b. Ceilings with interstitial spaces less than 12 inches to framing are not required to have lateral force bracing. c. GRID ATTACHMENT: The suspended ceiling grid shall be attached to two adjacent walls. Soffits complying D(ii)(2) are deemed to be equivalent to walls. d. SEISMIC JOINTS i. For ceiling areas exceeding 2,500 square feet, a seismic separation joint shall be provided. The layout and location of seismic separation joints shall be per the designer of record and noted on the plans. ii. In lieu of seismic separation joints, the ceiling may be divided into areas less than 2,500 square feet by the use of partitions or soffits as described below. 1. Partitions. Where used, partitions shall extend a minimum of 6 inches above the level of the plane of the grid and shall be independently braced to the structure above. 2. Soffits. Where used, soffits shall extend to a point at least level with the bottom plane of the grid and shall be independently supported and laterally braced to the structure above. iii. Other than partitions and soffits, seismic joints may not be used as part of afire rated ceiling assembly unless substantiating documentation is provided. iv. The minimum movement that must be accommodated at seismic joints is 3 A of an inch. e. PERIMETER CLIPS: Where `substantiating documentation is provided, perimeter clips may be used to satisfy the following requirements: i. 2 inch closure angle ii. Spreader bar requirements • f. Sprinkler Heads: Flexible head design that can accommodate 1 inch free movement in any direction shall be permitted as an -3- - • alternate to the requirement for 2 inch oversize rings, sleeves or • adapters, through the ceiling tile. g. "Powder driven shot -in- anchors" when used for seismic application as part of the prescriptive path in Seismic Design Categories D, E, & F shall have an ICC -ES approval for seismic applications and shall require "special inspection" irrespective of the type of "occupancy category" the structure is in. Anchors for kicker wires (splayed wires installed for purposes other than seismic restraint) are exempt from this requirement. As of the issuance of this interpretation, approved load testing values for the use of `powder driven shot -in- anchors" in normal - weight concrete over a metal pan deck have not been established Until such time as approved load testing values are established, an on -site pull -test of such assemblies is required. The test shall demonstrate that the anchor can support a minimum 250 lbs for not less than 10 seconds and be conducted by an approved testing agency. At a minimum, such testing shall be performed on 5% of the total number of wires but no less 5. Test samples shall be selected from dispersed locations. On Site Test Failures. In case of pull test failures, the testing agency shall notify the local jurisdiction. An increased level of testing, as described below, shall be conducted. All failed anchors shall be replaced. Increased testing requirements. 1. A minimum of 6 anchors in the immediate vicinity of the failed anchor shall be tested: 2. In the event of any additional failure, all anchors placed on the same day shall be tested. Load testing results are required to be submitted to the local jurisdiction for approval prior to the ceiling grid inspections. h. Expansion, Screw In and Adhesive Anchors. The International Codes Counsel — Evaluation Services (ICC -ES) has recently issued new acceptance criteria for the anchors noted above. In order to give manufacturers time to complete the approval process, the Building Codes Division is authorizing the following grace periods effective immediately:. 1. Expansion anchors:. Grace period expires November 30, 2007. In the interim, expansion anchors must comply with the previously issued acceptance criteria "ACO1." After that date, expansion anchors must comply with the new ICC -ES acceptance criteria "AC193." 2. Screw anchors: Grace period expires April 30, 2008. In • the interim, screw anchors must comply with the previously issued acceptance criteria "AC 106." After that date, screw - 4 - 1 _ " 11IT :t`. + _ _ rl: `a•- '. hr + . - i • _ 1 S, anchors must comply with the new ICC -ES acceptance criteria "AC 193." 3. Adhesive anchors: Grace period expires April 30, 2008. In the interim, adhesive anchors must comply with the previously issued acceptance criteria "AC58." After that date, adhesive anchors must comply with the new ICC -ES acceptance criteria "AC308." Please note that the grace periods referenced above will not be 1 extended. VI Upgrading of Existing Ceilings; a. Ceilings without Seismic Bracing. Where existing ceilings are without seismic bracing, the ceiling system shall be brought into substantial compliance with current code requirements • when 50% or more of the ceiling tile is altered, repaired or replaced as part of a general space alteration, or if all of the ceiling system is removed. Substantial Compliance means installation of the following items where required in new construction; i. lateral force bracing (splayed wires) ii. compression struts iii. slack wires on all light fixtures and air terminals. This requirement does not trigger the need for; i. 2 inch closure angle as specified in section II ii. Seismic separation joints iii. 1 inch movement in all directions around sprinkler pendants These upgrades are not required when: i. removing portions of tiles or panels and/or grid to alter • ductwork, sprinkler pipe, etc. ii. portions of a ceiling are removed only to facilitate the installation of sprinkler piping. b. Ceilings without Compression Struts. Where existing ceilings have seismic bracing but do not have compression struts at the center of the splayed wires, the addition of compression struts will only be required when and where the grid is replaced, altered, raised or lowered. Analysis: Building Codes Division staff has obtained clarifications from both the ASCE and CISCA staff regarding the intent of provisions in their respective documents. Both documents intended to allow the prescriptive construction of suspended ceilings in accordance with the methodology provided in the _`'• appropriate CISCA standard along -with the modifications listed in the ASCE 7 document. - Contact: Richard S. Rogers, Structural Program Chief richard.rogers@state.or.us (503) 378 -4472 '�. is , r — • , a I N • 1 I I I I I I I I I 1 I I I 1 I _ , I ,11E I - I I (E) WI4 ' , I I I I I I I I I I , I I I I I I I I I I I I I 1 I I I I I I I I I I I I I I I I I I -. 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