5900 36TH AVE W C BRIDGE POINT 2025-04-22

0 i M SHUTLER '_■maja CONSULTING MN WilM ENGINEERS,INC. 12503 Bel-Red Road,Suite 100,Bellevue,WA 98005*(425)450-4075*FAX(425)450-4076 i 9-8-2022 Randy Brown SynThesis PLLC 12503 Bel-Red Road, Suite 100 Bellevue, WA 98005 1. RE: BP Everett 500 Building C Everett, WA Plan Check#B2204-051 Randy, Please find below my responses to the building department comments on the structural drawings for BP Everett 500 Building C. • Comment Number 1 : The lateral system is a combination of special reinforced concrete shear walls and special steel concentrically braced frames. This has been clarified in the general notes on sheet S-1.0. • Comment Number 2 : The brace sizes have been revised so they are now in agreement on both the foundation plan and frame elevation. The brace size is a W14x132. After the initial permit submission,the brace frame locations have been revised to better meet the owner's needs. As such the braces can now be found on grids F and K. F.: • Comment Number 3 : The load cases used in design of the system are for normal loading of the braced bay. Case one is when the loading is balanced between tension and compression. Case two is how we internally determine if the loading delivered to the system will cause the brace to buckle. Case three is how we determine the maximum compression load applied to the column using overstrength. Case four(sheet L-51 and L-52)is new and shows the maximum level of load transferrable to the system by overturning analysis. This maximum level of load transferrable to the system is a higher load than the overstrength load case,and was used to design the connections. • Comment Number 4 : The brace member has been revised to W14x132 in all details. This member is highly ductile and meets all requirements of AISC 341-16. • Comment Number 5 : The braced frame beams have been revised to W24x84,which meets highly ductile member requirements. The axial demand load for the frame beams is 316 kips and can be '' found on sheet L-66 of the structural calculations. • Comment Number 6 : Protected zones have been added to the elevation on sheet S-3.1. • Comment Number 7 : Braced frame connection calculations have now been completed and can be found on sheets L-66 through L-72 of the latest calculation package, • Comment Number 8 : Panel overturning has been checked on calculation sheets L-27 through L-39 of the revised structural calculation package. The required connections to stitch the panels together removes any individual panel overturning issues. These stitched connections are now shown on the panel elevations as type"G" connections. i..