3214 BROADWAY BROADWAY KINECT APARTMENTS 2021-08-11

(7l9 Nevada: (702)365-9312 Idaho: (208)342-7168 Lochsa Colorado: (720)644-9246 engineering Alberta: (587)774-9040 28 March 2018 City of Everett 3200 Cedar Street Everett, Washington 98201 ATTN: James Bronder, PE Subject: Broadway Ave. &32nd Street Apartments (Plan Check Number B 1710-41) Lochsa Number: 154191.00 Dear Mr.Bronder, Plan reviews are an important part of the building process and we look forward to resolving the issues brought forth by the plan reviewer. Please see summary of our responses to the structural comments indicated below: Note: All revised drawings should be marked with clouds and delta symbol 1 for `Addenda #1", dated 03/28/2018. Comment#2: It appears that the permit calculations are missing drift checks for the lateral design of the structure. Please provide these computations as well as checks for horizontal irregularities of the structure. Response: See the added drift calculations on sheets A3-A19 for the third and second floors of the concrete podium structure which are the conditions above grade. Based on our review of the drifts,we have concluded that we have an extreme horizontal torsional irregularity type lb.per Table 12.3.1 of ASCE/SEI 7-10. For the wood portion,please see added drift calculations on sheets A145- A147. Calculations are based upon worst case walls located on grids 1.5, 12,A,and F. Analysis is based upon flexible diaphragm force distribution. Upon review of Table 12.3-1,the only horizontal irregularity is Type 2,Reentrant Corner Irregularity. Diaphragm forces and connections were originally designed to take the additional 25% per 12.3.3.4. Comment#3: It appears that the ELF procedure ofASCE 7-10 Sec 12.8 is being used for the design of the lateral force resisting system. Please address how accidental torsion and the accidental torsional amplification factors are being accounted for in the design of the structure. Please provide support calculations are Lochsa Engineering www.lochsa.com 1-866-606-9784