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

Drew Martin,Commercial Plans Examiner—Public Services Department RE:Plan Check#C 1802-019— 10725 19th Avenue SE—Correction Notice#2 October : 2018 'age 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. a. i. The joists can cantilever more than 24"per general note on page 11 of the Trus Joist TJI Joist Specifier's Guide below the cantilevers table by using Forte software.Attached forte calculation sheets S-2 and S-3 show the joists pass design. ii.No cantilever reinforcement is required but web stiffeners are provided at the cantilever support. iii.-iv. See joist calculation sheet S-2 for updated design loads. v. See attached joist calculation S-3 showing the reduced load on backspan. vi. The maximum uplift force at the back span of the joist is 336 pounds. Upside down IUS2.06 hangers are called out on detail 9/S4.2and have a capacity of 1,070 pounds of uplift. b. i. See attached sheet S-4 for the gravity weight applied to the rim beam. ii. The worst case uplift occurs with no dead load applied to the beam, which is analyzed on sheet S-6. The worst case moment and shear occurs with full dead load which is analyzed on sheet S-5. iii. See attached sheet S-4 for hanger check of the rim beam. iv. See attached sheets S-7 and S-8 for cantilever beam designs. The plans have been updated to follow uplift load path where required. See sheet S-9 for updated footing calculations at these locations. Lateral System: 15. This comment has not been completely addressed.