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REVIEWED BLD2023-0170+Structural_Analysis_or_Calculations+2.10.2023_7.58.50_AM+3362670February 9, 2023 Josh Kline MacDonald -Miller Facility Solutions 7717 Detroit Ave SW, Seattle, WA 98106 . The following documentation shall be available on ' site for the building inspector: ® COE APPROVED ARCHITECTURAL PLAN SET ' ❑ COE APPROVED STRUCTURAL PLAN SET ; ❑ COE REVIEWED CALCULATION PACKET ❑ ENERGY CREDIT WORKSHEET ❑ SITE PLAN ; ❑ CIVIL PLAN i El El �❑ ■ CITY OF EDMONDS BUILDING DEPARTMENT 2021 Project: Swedish Medical Center Edmonds Radiology RTU Replacement, Edmonds, WA Re: Structural Review RECEIVED Feb 10 2023 CITY OF EDMONDS DEVELOPMENT SERVICES DEPARTMENT BLD2023-0170 At your request we have reviewed the new heat pumps replacing the existing AHU on the roof of the Oncology Building. The new units will be mounted to the existing curbs and no new openings in the roof structure are expected. DESCRIPTION OF STRUCTURE The purpose of this analysis is to evaluate the weights on the roof of the new equipment. The structure, designed in 1989, has concrete columns and walls at the first floor supporting a concrete pan joist slab at the second floor. Above this are wood shear walls, posts, and a wood framed roof. The roof is framed with 20" deep engineered joist at 24"oc spanning 30 feet with plywood sheathing. ANALYSIS The roof structure was checked for the weight of the mechanical units along with code level snow load. Even though the loads on the joists with the new units are no more than 5% greater than the existing total loads, a strength check was performed to be sure the framing was acceptable without modifications. The existing joists have the capacity to support the mechanical units. Lateral seismic and wind forces on the units were checked to determine the anchorage of the new units to the existing steel curbs or curb extenders. RESULTS The new units shall all be anchored with a minimum of (8) #10 sheet metal screws for each unit Use the same screw size and spacing for curb adapters to existing curbs. Marjorie Lund PE, SE, DBIA 0ATAIWA=111 BY CITY OF EDMONDS 1201 First Avenue South, Suite 310 I Seattle, Washington 98134 I 206-402-5156 I www.lundopsahl.com 2/9/2023 STRUCTURAL CALCULATIONS 23-028-01 SMC - Edmonds Radiology RTU Replacement 21601 76th Ave W Edmonds, WA 98026 For MacDonald -Miller �UND SAHL arojeet SMC Edmonds Radiology RTLJ Replacerr. sheet suNect Load Review and Anchorage Client MacDonald -Miller Page No. Desagner MAL Date 219123 wwwAindapsahl.ccm Tel, 206.402.5156 SMC - Edmonds Radiology RTU Replacement Table of Contents Section Page Table of Contents ....................................... 2 Plan of exisitng..................................................... 3 Criteria.......................................................... 4 Overturning Check ........................................ 5 Equip replacement wts and joist check............ 6 Appendix Seismic Criteria Wind Criteria Equipment cut sheets for old and new available on request COPYRIGHT: The calculations, sketches and notations contained herein are not a part of the Contract Documents and any seal upon these documents only represents that they were prepared under the supervision of Lund Opsahl LLC. These calculations, sketches and notations are only an instrument for the sole use of Lund Opsahl LLC and are not to be used by any other party. If copies are provided to Building Regulation Agencies they are for the purpose of showing general criteria used for design. Copyright © 2023 Lund Opsahl LLC, All Rights Reserved. �� @•�Ild oAe,0&7 jE+oLTS N EE Cn KCa T`fP SECTION C SKYLIGHT SUPPORT %A1 1'/2"= 1i pn _ 59 �j�� rsUUr- rM)AMI U rLHIN VJ Dr-�� 1/8'-Y-O' FEET — 46LDe ;Co STUD ALL TYP - IQ PLANE OF J05T5 SKYLIGHTIPENTHOUSE ROOF T U5E SIMPSON SMEWED W SERIES }1' HAHGER5 FOR 56EWE0 CONHEG7I0H5 I 90° CDMHECTION57 FOR y_ MOTE: ALL WDOD COLUMN5 HAVE 5IMP15ON F� POST CAPS ANDA5P POST 5ASE5 UHLESS NOTED OTHERWI5E, ALL STEEL LOLUMN5 HAVE A EGO OR CCO WELDED AT TOP TO RECEIVE WOOD MEM5ERS UNLE55 NOTED O.5 PLTWOOIO 4 x1-2"n , u HI %g'6OLTS GLYWoov N r 11 /4�A307 G9L7S— 4V. _ 40a "E5ELOW° JOISTS J�EYOWD _CTION -IRU STEP IN ROOF n 63 53 w �O��VEK11 4WITH KERF I II/2 DOMT KC /CIA DOLT �N/ 5� OVERSIZED WASHERS =TAIL s3 s5 Pfclect 5MC Edmonds Radiology RTU Replacem sheet CPSAHL Subject Load Review and Anchorage LND Client MacDonald-Millef Page No aeslgner MAl Date 2%23 www,bndopsahl c om Tel: 206,402 5156 Project Address: 21601 76th Ave W Edmonds, WA 98026 Design Code: 2018 IBC ASCE 7-16 Project Description: Review existing structure to support new mechanical unit Provide seismic anchorage for the new unit Mechanical Unit Information (provided by Client) Unit Tag (e) Weight (n) Weight % Change Note New 307 Ibs 377 Ibs 23% Further analysis required. See attached calculations. **Note: Mechanical Unit Weights were provided by Client. Lund Opsahl takes no responsibility if incorrect unit weights were provided Summary The framing supporting the above mentioned units were checked for the additional weight added to the roof structure to verify demand on the existing framing does not exceed 5% per IBC Chapter 34. The above mentioned mechanical units were reviewed for overturning forces from wind and seismic loading. Calculations verifying client's proposed anchorage are included. The proposed anchorage of the units is acceptable. SUIAHL Unit Information Tag: New Weight: 377 Ibs Height: 2.92 ft Length: 4.00 ft Width: l3.42 ft Seismic Loading Project SMC Edmonds Radiology RTU Replacem Sheet subject Load Review and Anchorage cllent MacDonald -Miller Page No. Designer MAL Date 2/9/23 www.lunclopsahl.con Tel:206.402.5156 Fp= 154lbs D= 377 Ibs FFp(vrt) _ +/- 64 Ibs = Width N Worst Cast Uplift ASD: 0.6D+0.7E = 44 Ibs LRFD: 0.9D+E = 72 Ibs **Note negative values indicate uplift Wind Loading Fh= 31� D= 377 Ibs F� _ +/- 294 Ibs = Width N Worst Cast Uplift ASD: 0.6D+0.6W = -571bs LRFD: 0.9D+W = -713 lbs **Note negative values indicate uplift **Note our calculation checks overturning moment of the mechanical unit in the short direction(width). Reactions D E R1 189 Ibs -66 Ibs +/- 32 Ibs RZ 189 Ibs 66 Ibs +/- 32 Ibs Worst Case Compression ASD: D+0.7E = 257 Ibs LRFD: 1.2D+E = 324 Ibs Reactions D W R1 189 Ibs -136 Ibs +/- 147 Ibs Rz 189 Ibs 136 Ibs +/- 147 Ibs Worst Case Compression ASD: D+0.6W = 358lbs LRFD: 1.2D+W = 509lbs Rroiect SMC Edmonds Radiology RTU Replacem sheet r Subjod Load) Review and Anchorage DClient MacDonald -Miller Page No- HL 'i x,, MAL DPW214123 i,AvwSUIAJuridopsahkom Tei-206402.313$ Existing unit number Wt Width Depth Catalog Equip Height Number Name of Replacement unit to sit on same curb Wt Width Depth Height Catalog Equip Number AHU-1 307 55 36 25 YCCO18F HP-1 370 50 43 35 4YCZ6024A AHU-2 307 55 36 25 YCCO18F HP-2 370 50 43 35 4YCZ6024A AHU-3 526 64 45 33 YCC048F HP-3 243 60 46 41 4YCZ6048C AHU-4 352 55 36 29 YCC030F HP-4 377 48 41 35 4YCC4030A From overturning calculations there is no uplift (tension) on the units. Attachments are designed for shear only and wind forces govern. Maximum wind force is 318#. V=318/8= 40#/screw Use minimum 8 screws, #10 SMS Roof design Check 20" TJI/35 @ 24"oc Span = 30 feet Dead Load 20psf Snow Load 25 psf Assume mechanical unit at mid -span with 2joists carrying load M=90 (30)Z/8 + (377/2)x30/4 = 11,540 #-ft From 1995 catalog for TJI, Ma=11,890 #-ft DCR=0.97 Okay (point load calculation is conservative) A This is a beta release of the new ATC Hazards by Location website. Please contact us with feedback. 8 The ATC Hazards by Location website will not be updated to support ASCE 7-22. Find out why_ L)T Hazards by Location Search Information Address: 21601 76th Ave W, Edmonds, WA 98026, USA Coordinates: 47.8033727,-122.3356861 Elevation: 405 ft Timestamp: 2023-02-07T20:05:04.072Z Hazard Type: Seismic Reference ASCE7-16 Document: Risk Category: II Site Class: D-default Basic Parameters axes I- MR Marysville u. II —rett igI 405 ft a Name Value Description SS 1.283 MCER ground motion (period=0.2s) St 0.451 MCER ground motion (period=1.0s) SMS 1.539 Site -modified spectral acceleration value SMt * null Site -modified spectral acceleration value SDS 1.026 Numeric seismic design value at 0.2s SA Sol * null Numeric seismic design value at 1.0s SA * See Section 11.4.8 Additional Information Name Value Description SDC * null Seismic design category Fa 1.2 Site amplification factor at 0.2s FV * null Site amplification factor at 1.0s CRS 0.909 Coefficient of risk (0.2s) CRt 0.895 Coefficient of risk (1.0s) PGA 0.546 MCER peak ground acceleration mt. Baker- noqua National Fora e-auIe oRedm-Dnd Renton :-.A Map data ©2023 Google Report a map error A This is a beta release of the new ATC Hazards by Location website. Please contact us with feedback. 8 The ATC Hazards by Location website will not be updated to support ASCE 7-22. Find out why_ L)T Hazards by Location Search Information Address: 21601 76th Ave W, Edmonds, WA 98026, USA Coordinates: 47.8033727,-122.3356861 Elevation: 405 ft Timestamp: 2023-02-07T20:12:16.149Z Hazard Type: Wind ASCE 7-16 ASCE 7-10 MRI 10-Year 67 mph MRI 10-Year MRI25-Year 73 mph MRI25-Year MRI50-Year 78 mph MRI50-Year MRI 100-Year 83 mph MRI 100-Year Risk Category 1 92 mph Risk Category I Risk Category II 97 mph Risk Category II Risk Category III 104 mph Risk Category III -IV Risk Category IV 108 mph axes I- MR equirYl Marysville u. II —rett 11 405 ft a mt. Baker-noqua National Fora e-auIe oRedm-Dnd Renton :-.A Map data ©2023 Google Report a map error ASCE 7-05 72 mph ASCE 7-05 Wind Speed 79 mph 85 mph 91 mph 100 mph 110 mph 115 mph 85 mph The results indicated here DO NOT reflect any state or local amendments to the values or any delineation lines made during the building code adoption process. Users should confirm any output obtained from this tool with the local Authority Having Jurisdiction before proceeding with design. Please note that the ATC Hazards by Location website will not be updated to support ASCE 7-22. Find out why. Disclaimer Hazard loads are interpolated from data provided in ASCE 7 and rounded up to the nearest whole integer. Per ASCE 7, islands and coastal areas outside the last contour should use the last wind speed contour of the coastal area — in some cases, this website will extrapolate past the last wind speed contour and therefore, provide a wind speed that is slightly higher. NOTE: For queries near wind-borne debris region boundaries, the resulting determination is sensitive to rounding which may affect whether or not it is considered to be within a wind-borne debris region. Mountainous terrain, gorges, ocean promontories, and special wind regions shall be examined for unusual wind conditions. 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