3105 PINE ST DELTA HOTEL 2020-05-04

DCI 55 n �" i�yp k�...'.'i�ryv...-'8 ,..,iel 'Y erteineeFts ' 3 E 1 Washington '(\ JUN1 3 2013 E LLJ Oregon $ California CPI � (� 3� T .5 Texas Permit � rvIc T cp June 7,2018 Alaska Q. Colorado City of Everett Montana Attn: Drew Martin 3200 Cedar Street Everett,WA 98201 Re: Structural Plan Review 3105 Pine Street Plan Check Number B1805-025 Dear Mr. Martin The following is our responses to your structural comments for the referenced project in your e-mail dated May 18,2018. The sign has been designed considering Exposure B(ASCE 7-10 Section 26.7.2). For the easterly wind, the surface roughness per Section 26.7.2 qualifies as Exposure C, increasing the Kz-coefficient from 0.93 to 1.21 per Table 29.3-1 (h=80 feet). The wind pressure for easterly wind should be increased. DCI Response:The design has been updated to such that exposure B is used for all loading directions except for wind loading coming from the east uses wind exposure C. 4 Liao t3 A1o. ooadLE-REek<CO u/ La.0 e',"01, 7 The determination of Cf-factor on page 3 of the structural calculations is not clear. It does not appear consistent with ASCE 7-10 Figure 29.4-1. DCI Response:The Cf-factor used in the calculations is 1.9 from section 29.5.1 of ASCE 7-10. The loading diagrams on pages 4-7 appear to only represent Case A of ASCE 7-10 Figure 29.4-1. Based on Footnote 3, Cases B and C also apply. pe r toRxEcr DCI Response:The wind design approached used is from ASCE 7-10 section 9.5 which does not have the loads cases A, B and C used as specified in ASCE 7-10 section 29.4.1. /The load combinations identified at the bottoms of pages 4-7, and the calculations on page 3, indicate the design is only based on IBC Eqn. 16-12. Eqn 16-15 should also be considered. This combination is anticipated to control uplift on the anchor design. DCI Response:The original design used EQ 16-15 as the main concern was the uplift on the steel frame and thus the connections to the roof to resist the uplift.The updated design uses both EQ 16-15 and 16-12 to verify worst case loading for all connection locations and directions. The calculations do not clearly indicate if the weight of the sign surface has been included in the model in addition to the frame weight. The entire weight of the structure should be included. DCI Response:The updated design now includes the weight of the sign surface attached to the sign frame. See supplemental calculations S-1 and S-12. 6. The calculations do not include an evaluation of the existing parapet design with the additional lateral contributions from the sign. Calculations should be based on record documents or field (//:2) 818 Stewart Street,Suite 100tH Seattle,Washington,98101 Phone(206)332-1900 Service I nA.,novation Value . T�