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/ <br /> FS -- Swenson Say Faget <br /> b } STRUCTURAL ENGINEERING <br /> 0 0 loci <br /> 2124 Third Ave.Suite 100 <br /> ell Seattle,WA <br /> _ri, ® e'\I �s O 206:43.62121 <br /> 934 Broadway,Suite 100 <br /> Tacoma,WA 98402 <br /> August 8,2017 0 253.284.9470 <br /> Lisa Miller,Chief Operating Officer 3 ssiengtneers.cam <br /> Community Health Center of Snohomish County __.._._..._._.._._ <br /> 8609 Evergreen Way <br /> Everett,WA 98208 <br /> Re: Responses to August 2,2017 City of Everett Review Comments <br /> Plan check#B1705-065 <br /> CHCSC Rucker Avenue <br /> Everett,WA <br /> Following are our written responses to the August 2,2017 City of Everett review comments for the <br /> project. <br /> Structural <br /> Item 11. <br /> A full length reinforcing plate will be provided per the revised Detail 6/S3.1. <br /> Item 15. <br /> See revised Braced frame elevation 12/S3.1. Column thickness has been increased to 5/8"to meet <br /> compactness requirement for 8x8 HSS. <br /> Item 18. <br /> AISC 341-10, Section F2.6c,Required Strength of Bracing Connections,indicates that the required <br /> tension strength of brace connections is the lesser of the expected yield strength in tension of the brace <br /> or the maximum load effect that can be transferred to the brace by the system. <br /> The building code(IBC,ASCE 7-10)does not require the foundation,the braced frame footings in the <br /> current project,to be designed to resist uplift forces greater than those generated by the code base shear. <br /> Based on the equivalent lateral force analysis used for the project and the braced frame analysis,the <br /> calculated uplift force is approximately 139.1k. To resist this uplift,the foundation design shows(3) <br /> micropiles at each braced frame footing with each micropile providing an uplift capacity of 50k. <br /> Considering pile capacity allowable increases for short term seismic loads and the dead load of the <br /> concrete pile cap,the calculated uplift capacity of the braced frame footing is approximately 205k. The <br /> capacity to demand ratio,or effective overstrength, for the frame foundation is 205/139.1=1.47. <br /> Applying the effective overstrength factor to the braced frame connection force at the lowest level <br /> yields a connection force of 118.6k. <br />