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r ` • <br /> r • <br /> 410 <br /> Mr. Neil Montague <br /> Northwest Handling Systems <br /> Plan Check Number: B2103-014, First Building Review <br /> March 16, 2019 <br /> Structural <br /> 1. The structural design has been performed per ASCE 7-10 Section 15.5.3, which references a <br /> response modification factor of R=4. However, the design also considers a higher factor of R=6 <br /> for the moment frame direction. This is only permitted if documentation is submitted per <br /> Section 15.5.3.5 substantiating the use of a higher value. Note that these type of racks are <br /> typically not designed to perform better than ordinary moment frames, which are limited to a <br /> factor of R=3.5. The details do not comply with the requirements for special moment frames <br /> per AISC 341-10. The response factor should be reduced to R=4 for both directions. See IBC <br /> Sections 1613.1 and 1901.2. <br /> Response: This has been addressed. See attached updated calculations. <br /> 2. Continuing with the previous comment, the increased response modification factor will increase <br /> the anchor design loads by 50% for one direction. The increased loads should be used in the <br /> anchor design. See IBC Section 1604.1. <br /> Response: This has been addressed. See attached updated calculations. <br /> 3. Calculations for the anchor design should be submitted for review. The design should comply <br /> with ACI 318-14 Sections 17.2.3.4.3(d) and 17.2.3.5.3(c). The overstrength factor should be <br /> 52=3.0. See IBC Section 1604.1. <br /> Response: This has been addressed. See attached Anchor Design document. <br /> This review has been performed for general compliance with the building codes as adopted and <br /> amended by the state of Washington and the city of Everett. Corrections and comments made <br /> during the review process do not relieve the project from compliance with code and permit <br /> requirements. The designers-of-record are responsible for a complete design in accordance with <br /> the laws of the state of Washington. <br /> If you have any questions or require additional clarification, please contact us. <br /> Respectfully, <br /> Drew Martin, P.E., S.E. <br /> Associate Engineer/ Commercial Plans Examiner <br /> (425)257-8813 <br /> dmartin@everettwa.gov <br /> S:\BMa rtin\2021\B2103-014_R1.docx <br /> O3200 Cedar Street © 425.257.8810 O everetteps@everettwa.gov <br /> Everett,WA 98201 425.257.8857 fax everettwa.gov/sermits <br /> Page 2 of 2 <br />