3/16/2016 - Deferred submittal reviewed. Comments issued.

1. DIAPHRAGM

Please clarify what is acting as the diaphragm for this mezzanine. If the grating is being used please provide a research report from an approved third party showing the capacity of the grating as a diaphragm as required by IBC section 1803.4.

2. HSS COLUMN

AISC 341-10 section E6.5a requires columns in cantilever column systems to be highly ductile per AISC 341-10 section D1.1. The HSS 6X6X1/4 columns do not appear to meet the requirements for a highly ductile member. Please clarify.

3.COLUMN BRACING

AISC 341-10 section E6.4b requires columns to be braced the satisfy the requirements of beams classified as moderately ductile members as indicated in section D1.2a. Please show that this requirement is met.

4. SEISMIC SEPARATION

Please provide a seismic separation between the existing and new mezzanine or tie the mezzanines together to act as a unit as required by ASCE 7-10 section 12.12.3.

5. COLLECTORS

All beam to column connections collect seismic forces. Please indicate the connections are to be fully pretensioned with the faying surfaces prepared as Class A slip critical or better as required by AISC 341-10 section D2.2(4).

Please provide a written response to the comments above and include two copies of additional or revised drawings and one copy of addition or revised calculations.