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3 /7Jci . 0 I5 <br /> , ,,,,c., . = , '''V'W Harris Groin:;' <br /> 1/15/18 } '��� "/ <br /> v WAS 4/' <br /> Reference: Customer Name:Access Laser , ?,v-, ,,,_. ____- <br /> - / "3 ", <br /> „ t <br /> 'z 4',', .'' <br /> Project Title:Tenant Improvement " <br /> Subject of Letter: Clean Room Structural Review X36 <br /> HGI Project No.:0070285.00 -AyCM� ti� i0 ke . ,1 <br /> S I <br /> Background: <br /> The following memo is regarding a new aluminum framed clean room which is part of the Access Laser Tenant <br /> Improvement project at 2211 West Casino Road, Suite A Everett, WA.The new clean room will be installed inside <br /> of an existing tilt up concrete panel warehouse. The California based manufacturer of the clean room has hired a <br /> California based PE to provide sealed calculations and design drawings for the clean room. This design firm shall <br /> be considered the Specialty Structure Engineer(SSE).As the Engineer of Record (EOR) for the Access Laser <br /> Tenant Improvement Project Harris Group has provided a review of these design documents. <br /> General Review: <br /> The design calculations and drawings have been reviewed to determine if code prescribed loading and design <br /> criteria have been followed. It is Harris Groups opinion that the attached design is adequate and that the SSE has <br /> used sound engineering methods. It should be noted that the clean room structure will not attach to the warehouse <br /> structure. <br /> Gravity System Review: <br /> The clean room walls consist of aluminum strut posts with wall panel infill. The clean room ceiling consists of <br /> aluminum trusses, stiffened aluminum struts, and posts. As the clean room will be installed within an existing <br /> warehouse no snow load has been considered. Further, a ceiling live load of 0 PSF has been used for design. <br /> The attached design calculations show the gravity system is adequate for the design loads. <br /> Lateral System Review: <br /> Seismic loading has been determined using ASCE 7 Chapter 13 for nonstructural components. This was chosen <br /> since ASCE 7 Chapter 12 does not provide design coefficients for aluminum structures, and there is no cyclic test <br /> data for this undefined structure.The design values from ASCE 7 Chapter 13 table 13.5-1 have been used for <br /> "Other Flexible Components of High Deformability Elements and Attachments".This approach uses sound <br /> reasoning. <br /> Two types of moment connections are used to make up the lateral force resisting system of the clean room. First, <br /> each strut beam to strut post connection has a gusset plate to obtain fixity at the connection. Second,the truss top <br /> and bottom chords are fixed to each column to obtain fixity at the connection. Each post is attached to the slab on <br /> grade using post installed anchors.The attached design calculations indicate the post to the slab connection has <br /> been modeled as a pinned connection. <br /> The attached design calculations show the lateral system is adequate for the design loads. <br /> Post Bearing Check: <br /> The SSE indicates the slab bearing check shall be per the EOR.Worst case post compression on Frame F2= <br /> 23431b. Existing slab is 6"thick.Assume 4"post base and 1:1 load spread, load area is (4"+6"+6")^2/144= <br /> 1.78SgFt. Soil bearing is 2343lb/1.78SgFt= 1316PSF<2000PSF. Therefore, post bearing is OK. <br /> Sincerely, <br /> Alejandro M Warner PE <br /> Our difference is engineered. 300 Elliott Ave.W. <br /> Suite 500 <br /> Seattle,WA 98119 <br /> (206)494-9400 <br /> www.harrisoroup.com <br />