10721 19TH AVE SE 2023-04-07 - Laserfiche WebLink

Mr. Ross Jameson 2812 Architecture Plan Check Number: C1802-019, Second Review (Structural) September 26, 2018 Structural General: 1. This comment has not been completely addressed. The Special Inspection Schedule in Note 13 on Sheet S1.0 should be revised to include geotechnical special inspections. See IBC Table 1705.6. Gravity System: 8. This comment has not been completely addressed. The response states that the cantilever floor joists support the gravity loading, including the third floor wall and roof tributary loads, while the B2 beam transfers reaction from the discontinuous shear walls. See IBC Sections 1604.1, 1604.4, and 1613.1. The following comment should be addressed: a. The following should be addressed for the joists: i. The manufacturer's literature for the floor joists indicates that they are limited to a maximum cantilever length of 24 inches. It appears this limit may apply to the tabulated conditions provided in the literature. Additional information should be provided verifying that the joists can perform in negative bending for the loads and length shown in the drawings. ii. Verify if cantilever reinforcement is required. Revise Detail 9/S4.2 as needed. iii. The dead line load, based on a tributary wall height of 11 feet and a tributary roof width of 7 feet, appears to be at least 260 plf based on the weight on calculation page A-5. The line load on page B-8 is only 108.5 plf and should be increased. iv. The snow line load, based on a tributary roof width of 7 feet, appears to be at least 175 plf. The line load on page B-8 is only 152.5 plf and should be increased. v. The joist partially relies on loads on the back-span portion for stability. The joists should be evaluated with reduced dead loads on the back-span (i.e., 0.6D). Full live loads should be placed on the cantilever only (i.e., no live load on the back-span). vi. Calculations substantiating the hold-down capacity of the hangers at the back-span end should be provided where required to stabilize the joists. b. The following comments should be addressed for the beam: i. The design assumes that the joists carry all of the gravity loading. However, depending on the relative stiffnesses of the framing, the beam will deflect and support a portion of the gravity weight. A portion of the gravity loading should be including in the beam loading. ii. The beam should include vertical seismic load effects per ASCE 7-10 Sections 12.4.2.2 and 12.4.3.2. iii. Calculations substantiating the capacity of the hangers shall be submitted for review. The hangers shall be able to resist loads in both directions. iv. The beams are supported by cantilever B2 beams. Calculations substantiating the load path should be submitted for review, including but not limited to: beams, posts at the cantilever base, and back-span resistance. age 2of46 CITY OF EVERETT • 3200 Cedar Street • Everett, WA 98201 • (425) 257-8810 • Fax(425) 257-885/