5411 OCEAN AVE 2022-02-24 - Laserfiche WebLink

For Calvin Vander Veen Structural Addendum Number 1 From Larry E. Steward PE 11714 Expires 8/20/2020 24738 SE Mirrormont Drive Issaquah, WA 98027 Email Iesteward@hotmail.com phone 425-765-9965 Using Table R602.10.1 of IRC The American Plywood Association tested walls with 4 foot high opening with normal stud height of 10 feet or less did not have significant drop off of Shear strength. Looking at the West wall consists of the 40 foot west wall of the addition which has 17 feet of full height opening which gives 57.5 percent of wall length which qualifies as a braced wall. The Table R602.10.1 Shows 60 percent. This falls short about 2.5 percent. However parallel to this 17.5 feet is a interior braced wall which compensates. The wind force on this is not great as the previous analysis shows. The east wall has 33 feet of opening, however only 15 feet of them are near full height. Therefore the percentage is 15/85= 18 percent. Again the wind forces are small on the long walls. The walls running East and West are shorter and subject to greater unit shear stresses per unit of length. The length of the braced walls in the east west direction exceeds 60 percent. The 2"d story walls are subject to less wind stress than the first floor. The critical part of this is the connection from the roof trusses to the top plate of the second floor stud walls. This is subject to uplift and has been described in my precious structural submittal Sincerely Larry E. Steward PE 11714 40J31010 19 s