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Swenson Say Faget <br /> 0 STRUCTURAL ENGINEERING <br /> 2124 Third Ave,Suite 100 <br /> Seattle,WA 98121 <br /> 0 206.443.6212 <br /> 934 Broadway,Suite 100 <br /> Tacoma,WA 98402 <br /> July 12,2017 O 253.284.9470 <br /> Lisa Miller,Chief Operating Officer - weer`;;/cef`'cry, <br /> Community Health Center of Snohomish County <br /> 8609 Evergreen Way <br /> Everett,WA 98208 <br /> Re: Responses to June 21,2017 City of Everett Review Comments <br /> Plan check#B 1706-031 <br /> CHCSC Rucker Avenue <br /> Everett,WA <br /> Following are our written responses to the June 21,2017 City of Everett review comments for the <br /> project. <br /> Structural <br /> Item 1. <br /> While Special Concentrically Braced frames are being designed for the project,the project is a <br /> voluntary seismic retrofit of an existing building. The existing building has a complete lateral system <br /> even though the existing lateral system consists of non-compliant steel moment frames. The <br /> redundancy factor of 1.0 was used because,independent of the new braced frames, there is an existing <br /> lateral system for the building. Removal of one of the braces in the braced frame system will not result <br /> in a reduction in story strength or extreme torsional irregularity. <br /> Item 2. <br /> a. Please see revised sheet S2.1 and revised/added footing details. New footing extensions are <br /> intended to partially lap over the existing footings and match existing bottom of footing <br /> elevations. The top of footing elevation would be set at the same elevation as current column <br /> plinths. <br /> b. See revised footing details. The new footing overlays/extensions will be doweled together so <br /> that horizontal sliding forces can be resisted by combined however compression and uplift <br /> forces from the braced frames are intended to be resisted by the micropiles. <br /> c. See approximate dimensions provided on Sheet S2.1 <br /> d. Only sliding forces are intended to be shared and resisted by the combined new and existing <br /> footings. Some vertical load sharing is inevitable but not part of the design. The existing <br /> footings are sized for all gravity loads and the footing extension and micropiles are designed for <br /> uplift and compression forces from the braced frames. <br />