1709 HEWITT AVE 2018-01-02 MF Import

� � 2 ENGINEERING INC., P.S. db�DOVETAILSTRUCTURES lIN2/-49"�DR. S.E. CIVfL�STRUCTURAL F.NGINEERING EI'F.RF.77; IVA. 9R208-Y621 M/CH.4F.L P. AlCCANN SF.. O/�%/('l:;l:SX: 1a13)337-3075 /3FNJ.1MlNJ. MCC4NN F'.L7: 1�Mail: m2engineeringinc(,nlaol.com October 23, 2003 R�3��- �� Steve Miller City of Everett Public Works 3200 Cedar Street Everett, WA 98201 O z,\�,��' � .��,. , Subject: 1709 Hewitt � 04` Q a �p0.� Remodel Structural Comments ; �:Et� ....•��v ��`,� y�cv`ces Dear Steve: Pa�`� I have reviewed the structure of the building mentioned above, on site and through calculations, to include the proposed changes, and have the following comments: 1. The main area of concem is the lateral capacity of the structure across the short direction (east-west). As the building presently stands, the two story structure has wood roof and iloor diaphragms and brick exterior walis, measuring 120' X 24' X 30 feet tall. There are no interior east-west shear walls presently. The present diaphragm aspect ratios exceed the present maximum of 4:1, and this is the weakest point. It is proposed to add five interior cross wall (new shear wall) lines to cut the present diaphragm ratios to approximately 1.25:1 maximum. Although the roof diaphragm as proposed will exceed the limit of 100 plf(l36 max), it is a far cry from the present stress of 528 plf. The existing floor diaphragm stresses (diagonal planking) are acceptable structurally (far less than the allowed 600 pl�. The front wall line facing Hewitt will be strengthened by adding plywood shear walls above and below the windows in the first story level. The lateral �vill be resisted through bending of the TS tube columns, but over a much shorter length, the plywood walls providing the stiffness to reduce the east-west unsupported length. lt is estimated, considering the reduced east-west unsupported length of the columns,