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' E1ISTRUCTURAL <br /> ENGINEERS <br /> Engineers Northwest Inc.,P.S. <br /> 7. The plans do not provide a connection detail for the intersection of the diaphragm framing and <br /> beams at locations without columns. A detail should be provided. See IBC Section 107.2.1. <br /> Response: Additional details have been added to address this. <br /> 8. Detail 3/S1.2 specifies a bolted shear connection using a 1" plate welded to the supporting beam. <br /> The weld size should be specified. See IBC Section 107.2.1. <br /> Response: Correct detail and call out has been added. Please see typical beam to <br /> column detail and beam to beam connection detail. (1,2,3,4 on 53.1) <br /> 9. Detail 3/S1.2 specifies a bolted shear connection using (2) 3/a A325N bolts. Detail 4/S1.2 <br /> references Detail 3/S1.2 for this connection, however, other details with bolted connections do not <br /> reference Detail 3/S1.2. The details should be coordinated to specify the connection requirements. <br /> See IBC Section 107.2.1. <br /> Response: Correct detail and reference has been made. <br /> 10. Detail 8/S1.2 specifies a bolted connection between the guard posts and the structural framing with <br /> (2) 5/8" bolts. The type and grade of the bolts should be specified. See IBC Section 107.2.1. <br /> Response: The detail has been revised to show flare bevel weld. Please see attached <br /> connection calculation and the detail 6/S3.1. <br /> Gravity System: <br /> 11. The structural design for the stairway appears to be incomplete. The following should be <br /> addressed: <br /> b. The stair stringers and supporting framing to the main structure appear to be incomplete, <br /> particularly at Grid B/2, per the plans on Sheet S1.1. See IBC Section 1603.1. <br /> Response: The stair stringer framings is now correctly shown on the plan. <br /> c. The drawings do not appear to include connection details for the stairway framing, including <br /> but not limited to the cantilever framing and connections of channel stringers to wide-flange <br /> beams. Details shall be provided in the drawings. See IBC Section 107.2.1. <br /> Response: The detail showing the connection from stringer to beam and beam to <br /> column have been added. <br /> d. Calculations substantiating the stairway design shall be submitted for review, including but <br /> not limited to stairway framing, mezzanine framing supporting the stairway, and the <br /> connections. See IBC Section 1604.1. <br /> Response: Please see attached calculation. The calculation also includes the <br /> connection of the stringer to the cantilevered beam with weld, and also the <br /> connection of cantilevered beam to the column. <br /> Lateral System: <br /> 12.The lateral analysis has been performed using a finite element model (FEM). The structural <br /> calculations indicate the Equivalent Lateral Force Procedure (ELFP) of ASCE 7-10 Section 12.8. See <br /> IBC 1613.1 and ASCE 7-10 Section 12.7.3. The following documentation should be submitted for <br /> review: <br /> 9725 Third Avenue NE•Seattle,WA 98115 <br /> 206.525.7560.fax 206.522.6698 <br /> www.erigineersnw.com <br />