3315 SEAWAY BLVD 2020-06-05 - Laserfiche WebLink

EMI= INN 11111111111111 n■r■r ww ® MIN 7. The diaphragm analysis on calculation page 5 is based on a diaphragm connection length to the shear walls of 37 feet. However, the wall length on Grid F.6 is only 20 feet long. The diaphragm design should be revised. Alternatively,the diaphragm should be provided with a collector. Calculations substantiating the design of the collector, including the connection to the shear wall, should be submitted for review. A detail for the collector connection should be included in the structural drawings. See IBC Sections 107.2.1, 1604.1, 1604.4, and 1613.1, and ASCE 7-10 Section 12.10.2.1. { DCI Response: The diaphragm has been check using a depth equal to the shear wall length. See updated calculations sheet 0-5. 8. Design uplift forces on the shear walls are calculated on pages 9 and 10. The shear wall holdown design has not been provided in the structural calculations. The earthquake component of the holdown forces exceeds 20% of the total uplift. The earthquake component shall be increased per the provisions of ACI 318-14 Section 17.2.3.4.3. Calculations substantiating the holdown design should be submitted for review. Note that the uplift forces have been calculated using ASD load combinations; LRFD-based loads shall be used to verify the anchorage design. See IBC Section 1901.2. DCI Response: Calculations for the anchorage of the shear wall hold down to the footings have been performed. See updated calculations sheets 0-29 and 0-36 thru 0-40. Miscellaneous: 9. Sheet A5.6 show plans and elevations for an elevator. The following comments should be addressed: a. The elevator design drawings should be included in the list of deferred submittals in the Structural General Notes. See IBC Section 107.3.4.1. b. The design loads for the elevator system, including impact loading, should be specified in the "Design Criteria and Loads"section of the Structural General Notes. At a minimum, estimated design loads should be specified for the design, and verified when the elevator design drawings are submitted for review. See IBC Sections 1603.1.8 and 1607.9.1. c. The building structure(i.e., elevator shaft and supporting floor framing)that supports components of the elevator system is included in the current submittal drawings. Calculations substantiating the design of the structure to support the elevator loads concurrently with other loads should be submitted for review. The calculations should include the evaluation of deflection limits per IBC Section 1607.9.1. The design shall consider concurrent multi-directional loading as determined by the elevator manufacturer. See IBC Sections 1604.2 and 1605. d. The connections between the elevator guide rails and the structural framing are typically the responsibility of the engineer-of-record for the building system. At a minimum, connection details between the rail bracket and structural framing are required. Calculations and details for the elevator connections to the structural framing should be submitted for review. The design shall consider concurrent multi-directional loading as determined by the elevator manufacturer. The required locations and maximum spacing for the connection points should be specified in the structural drawings. See IBC Section 107.2.1 and 1604.4. e. The structural calculations shall be performing using the appropriate load combinations including live and seismic loading per IBC Section 1605.3. In addition, documentation shall be submitted verifying the nominal loads have been increased for impact effects per IBC Section 1607.9.1. DCI Response: a. The structural general note -: - been updated to include elevators in the deferred 1