3315 SEAWAY BLVD 2020-06-05 - Laserfiche WebLink

1111111111111111 MINI INNIIIIII Inil width has been used based on the fact that the floor or roof sheathing is applied perpendicular to the framing so that the width of the sheathing is typically 4 or 8 feet wide.When the shear wall tries to lift up the sheathing will effectively"pick up"the floor for some distance. For this project DCI would like to keep this 4'tributary width as the basis for our design. i. The shear wall holdown design shall be revised. The earthquake component shall be increased per the provisions of ACI 318-14 Section 17.2.3.4.3. The design load shall be calculated per ASCE 7-10 Section 12.4.3.2 Equation 7:a)the overstrength factor shall apply to the earthquake component, not the net uplift force after reduction by gravity loads;and b)the vertical seismic load effect per Section 12.4.2.2 shall be included in the design load. Note that the uplift forces have been calculated using ASD load combinations; LRFD-based loads shall be used to verify the anchorage design, not soft conversions. See IBC Sections 1613.1 and 1901.2. DCI Response:The design for the anchorage of the shear wall hold downs has been updated to include overstrength factors per ASCE 7-10 Section 12.4.3.2 equation 7.See Supplemental calculations sheets S-6 thru S-18. j. The design of the HDU8 anchor requires a minimum embedment of 11";the calculations states a footing thickness of 14". The footings are only 12"thick per Sheet S2.0. The design shall be revised. The minimum concrete cover of 3" per ACI 318-14 shall be maintained. Verify the minimum clearance required by the manufacturer for this product. DCI Response: Based on updated anchorage calculations the HDU 8 anchors require 13" embedment.As a result,the continuous footings now have a depth of 16"at the HDU 8 holdowns to provide 3"cover.The footings with the HDU 5 and below will have a 14"depth to provide a 4" cover for the 5/8"diameter anchors that require 11"embedment. k. The following comments shall be addressed for the Hold-Down table in Detail 12/S3.0: i. The design strengths shall be defined as ASD or LRFD. Note that the design values in the Shear Wall Schedule of Detail 11/S3.0 should be similarly defined. ii. The embedment lengths shall be revised for the HDU8. iii. Calculation page T-8 is based on the Hilti HIT-RE 500 system. Note 6 specifies the HILTI HIT-HY 200 system. The note shall be revised. Note that holdowns used for other locations are based on the HILTI HIT-HY 200 system. If all anchors are changed to the new system,revised calculations for all holdowns shall be submitted for review. DCI Response:Design strength for capacity has been noted as ASD.Embedment lengths have been updated and the calculations have been updated to only use Hilt HIT HY-200 adhesive.See 12/S3.0 and supplemental calculations S-7 thru S-18. I. The following comments shall b: addressed for the lid joists: 3 5