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ria <br /> 11•111111111 M <br /> INN <br /> EMI <br /> i. Revised calculations for the gravity framing should be submitted for review <br /> as needed based on comments above for the gravity loading. Framing shall <br /> [ be designed for concentrated gravity loads where they occur. <br /> ii. If openings larger than 12"(i.e.,joist spacing minus the width of the joist <br /> top chords)are required,supplemental framing and details for the openings <br /> shall be provided. <br /> iii. Additional calculations shall be provided for continuous joists supporting <br /> transfer loads from adjacent discontinuous joists at openings. <br /> iv. Calculations substantiating the design of wall framing supporting <br /> concentrated loading from above shall be submitted for review. <br /> DCI Response:As we discussed on the phone and the loading given in our calculations,the 125 PSF <br /> is more than adequate for the intended use of the TAT structure. For any HEPA filters placed the <br /> contact load is approximately 40 PSF which is much less than the design load of 125 PSF. <br /> Additionally,openings in the floor have been coordinated with the mechanical engineer such that <br /> there aren't any duct penetrations that will not fit between the joists spaced at 16"o.c.As such, <br /> all joists are continuous for the full span. Lastly,the HEPA filters will sit on sleepers as noted on <br /> plan,S2.1 and detail 7/S4.1.See supplemental calculations sheet S-19 for lateral loading on the <br /> HEPA filters. <br /> 10.This comment has not been completely addressed: <br /> a. Sheet S2.1 now includes a W8x18 hoist beam. The beam is shown at the mezzanine floor level, <br /> not the roof level. Detail 6/S4.0 does not show the beam and the required connection to the <br /> columns. The beam elevation should be clarified. A connection detail should be provided. <br /> b.Section 4/S3.0 on Sheet S2.0 shows a section through the elevator pit. The section shows an "HSS <br /> column per plan". However,the HSS elevator columns do not occur at the locations show in the <br /> section. The required connection for the columns to the foundation should be specified. <br /> DCI Response:The plan now indicates that the bottom of the hoist beam is located at elevation <br /> 25'-5". Detail 6/S4.0 has been updated to show the connection of the hoist beam to the elevator <br /> columns.The location of the section cut for detail 4/S3.0 has been updated on the foundation <br /> plan to correctly show the location of the column.The column connection to the embed plate is <br /> shown in detail 4/S3.0. <br /> Structural Comments <br /> 7. This comment does not appear to be addressed. Page 5 of the structural calculations include <br /> revisions. However,the revisions do not address the comment. See the following: <br /> a. The original comment noted that the diaphragm load must transfer to shear walls that are shorter <br /> in length than the diaphragm. The wall on Grid F.6 is only 20 feet long. The calculations still appear <br /> based on the full diaphragm depth. Note that the diaphragm shear load appears to be at least 600 <br /> plf for the 20'wall length. <br /> b.The general diaphragm design is unclear. The original calculation states that the diaphragm is <br /> blocked,though the drawing do not appear to indicate this. In addition,the calculation considers a <br />