1410 119TH PL SE 2022-07-19 - Laserfiche WebLink

8. The proposed construction of the exterior decks (north end of the Upper Floor) should be clarified on the plans. 9. The stair construction should be detailed on the plans (including a section) to include rise, run and minimum tread length at the bend. 10. Structural calculations for the gravity framing members that don't comply with the prescriptive provisions of the IRC should be provided. Two beam calculations are included in the back; the locations are not clear, and seismic with overstrength is not considered. A framing key plan with coordinating beam IDs should be included. 11.A shear wall key plan with coordinating wall IDs should be provided. Portions of the lateral design appear to require force-transfer walls with strapping around openings. Notes on the plans and Detail 2/S-5.0 appear intended to specify strapping, but it is difficult to follow; the straps used for holdowns vs force-transfer are difficult to distinguish. 12.The project includes post-installed anchors in existing concrete. Calculations for these connections should be provided. The strength and condition of the concrete is unknown. Documentation substantiating the design strength should be submitted, or lower-bound values that minimize the available strength should be used. 13.The building requires additional holdowns. The required locations should be clearly shown. The connections to the concrete are required to amplify the seismic component (note - not the net uplift value after deducting gravity loads) with the overstrength factor. See ACI 318-14 Section 17.2.3.4.2. Vertical seismic effects per ASCE 7-10 Section 124.2.2 are required. The load combinations per Section 12.4.3.2 should be used. 14.The plans indicate retrofit of existing walls to shear walls. This may require post- installed sill plate anchors in Foundation Details 2/S-2.0, 3/S-2.0, 3/S-3.0, and 4/S-3.0 to comply with the shear wall schedule and details, which are not provided. The seismic loads should be designed including overstrength per ACI 318-14 Section 17.2.3.5.2. 15.The calculations should include design of the floor and roof diaphragms per ASCE 7-10 Section 12.10.1.1. Collectors should be designed per Section 12.10.2.1. In order for the processing of your application to continue, it will be necessary to provide the Building Division with two new sets of revised construction documents reflecting the corrections requested. Please include a response letter which indicates how the corrections were resolved. All codes cited refer to the 2015 International Residential Code (IRC), the 2015 International Building Code (IBC), the 2015 International Mechanical Code (IMC), and/or the 2015 Washington State Energy Code (WSEC), as amended by the State of Washington and adopted by the City of Everett. These comments address building issues only. Additional revisions or additions may be required by other departments (such as Utilities, Traffic, Planning or Fire). All required submittals must be of sufficient detail and information to ensure that the proposed structure will be constructed in compliance with all adopted codes. Sincerely, o 3200 Cedar Street © 425.257.8810 O tlee@everettwa.gov Everett,WA 98201 425.257.8857 fax everettwa.gov 3 \ L-1