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MINIM <br /> M_ <br /> MINI <br /> MINNNEM <br /> 11. The second floor 3x13.25 beams have been evaluated considering a live load of 30 psf per <br /> pages 1-2 of the structural calculations. The load conditions on the beams have changed and <br /> appear to be higher due to concentration of applied loads. Existing framing shall meet the <br /> requirements of the IBC per IEBC Section 807.4. It appears the second floor is used for office <br /> space and shall be designed for a 50 psf live load and 2,000 lb concentrated load per IBC <br /> Table 1607.1 Item 22. In addition, the design shall include a 15 psf partition load per IBC <br /> Section 1607.5. The design shall consider the unbraced lengths along the stairway opening <br /> unless lateral restraint is provided. Note that if the second floor diaphragm consists of straight <br /> sheathing oriented parallel to the beam, nailing to the sheathing will not provide adequate <br /> restraint. Revised calculations substantiating the design should be submitted for review. <br /> Calculations verifying the capacity of the connections to the existing columns should also be <br /> submitted for review. See IBC Section 1604.1. <br /> DCI Response: The existing floor framing joists and beams have been more accurately <br /> reviewed in the field.The joists have been determined to be 3"x 131/4" @ 12" o.c.while <br /> the floor beams at each column are double 5-3/4"x13-1/2". Based on the new framing <br /> sizes the live load capacity of the 2nd floor framing meets or exceeds the required 75 PSF <br /> retail loading requirement of the code. <br /> 12.Detail 5/AF1.1 indicates that the lower stairway is effectively constructed of 5.5-inch deep <br /> wood joists at 12-inch spacing. The stringers do not appear adequate considering the <br /> minimum clear span of 7.5-feet per Section 1/A8.1, and dead and live loads of 15 psf and 100 <br /> psf, respectively. Documentation substantiating the design of the stringers should be <br /> submitted for review. The design should also evaluate the 300 lb concentrated load per IBC <br /> Table 1607.1 item 30. <br /> DCI Response: Calculations have been performed for the stringers. The design loading <br /> used is 15 PSF dead load and 100 PSF live load.A 300-pound concentrated load was <br /> checked but determined not to be the maximum load case. See sheets S4 thru S6. <br /> 13. The structural documents do not appear to include a design for the second floor stairway <br /> shown in Plan 5/A8.1. Details for the stairway should be included in the structural plans. <br /> Calculations substantiating the design should be submitted for review. See IBC Sections <br /> 1603.1 and 1604.1. <br /> DCI Response: See sheet S4 for design of stringers from the mezzanine to the 2nd level. <br /> 14. The structural drawings appear to be missing nailing between the floor sheathing and <br /> the framing. See IBC Section 107.2.1. Nailing should be specified in the following <br /> locations: <br /> a. Plan 1/AF1.1:New mezzanine floor at elevator. Sheathing must also be specified. <br /> b. Plan 1/AF1.1:Existing sheathing to new framing. <br /> C. Plan 2/AF1.1:Existing sheathing to existing and new framing. <br /> d. Sections 3/AF1.1, 4/AF1.1, and 5/AF1.1:Landing and steps. <br /> DCI Response: The elevator addition is no longer part of this project,so comments a, b <br /> and c do not apply. For part d of this comment see updated detail 3-6/AF1.1 for requested <br /> nailing at landing and steps. <br />