14. SEISMIC LOAD
Reference the seismic load determination. None of Anchorage, AK is Seismic Design Category C. Seismic Design Category D is the lowest category in Anchorage. Please clarify. Please clarify what lateral system is being used. For masonry only Special Reinforced Masonry Shear walls are permitted in seismic design category D. While wind may control the design forces, it is likely prescriptive seismic requirements will control detailing. Where wind controls, structures must still be detailed as required for seismic. Reference IBC section 1604.10.
Comment remains. The response is not clear in how the requirements for Special Reinforced Masonry Shear Walls have been met. Please clarify. Reference ACI 530-08 section 1.17.3.2.6. WAB – 5/31/2012
15. DRIFT AGAINST PARAPETS
Please verify no snow drift loads apply against the parapets along the 24’ length of the building. Reference ASCE 7-05 section 7.8.
Comment resolved. The parapet is 2’-6” tall. This is not tall enough for a drift load. WAB – 5/31/2012
16. DESIGN WIND SPEED
The design wind speed has been taken as 150 mph. While this is conservative it leads to a base design pressure of 39.66 psf (qp) or 59.5 psf on windward parapets and 39.7 psf on leeward parapets (these are main wind force resisting loads…components and cladding would be worse). It is possible that the 45 psf used is conservative, but this must be shown. If the intent is not to design to 150 mph wind, please revise the calculations and resubmit. Reference ASCE 7-05 section 6.5.12.2.4.
Comment remains. The wind load on the parapets in the updated calculations do not appear to be per ASCE 7-05 section 6.5.12.2.4. It’s possible the load determined is for the main-wind-force-resisting system case, but generally parapet design is controlled by components and cladding. Please note that no parapet design could be located in the calculations. WAB – 5/31/2012
17. DESIGN OF C5X6.7
Reference the calculations and the drawings. It appears that the calculations provide a design of a C5X9, but not C5X6.7. Please clarify. Reference AAC section 23.10.104.8.
Comment resolved. Response accepted. WAB – 5/31/2012
18. LINTEL
Reference the building sections. The building sections appear to require the general contractor to provide the lintels at the openings in the CMU. Please verify this is the intent. If so, this must listed as a deferred submittal. Please note that work above the foundation level can not commence without lintels so deferring this item would delay full approval of the module.
Comment remains. No response provided. WAB – 5/31/2012
19. FOUNDATION REQUIREMENTS
Reference sheet 7 of the module drawings. Please clarify the foundation requirements. Is the building being supported by a series of 2’X2’ footings? What spans between these footings? What keeps frost heaving from occurring on whatever spans between the footings? How deep are the 2’X2’ footings? What’s the reinforcing requirements. Reference AAC section 23.10.104.8. Response to this comment may generate additional comments. Please note that the floor of the module is insulated which is would likely keep heat from the soil so the foundations will need to be as if for a cold foundation.
20. REINFORCEMENT OF CMU WALLS
Reference the drawings. Please clarify where the masonry reinforcement has been indicated. CMU shear walls must be reinforced per ACI 530-08 sections 1.17.4.3.1 and 1.17.3.2.6 at a minimum, and shear design must be per ACI 530-08 section 2.3.5 or 3.3.4.1.2 depending on if ASD or LRFD design procedures are used.
21. PARAPET DESIGN
Reference the calculations. Please clarify where the design of the parapets and their connections have been provided. Design of parapets must meet the load requirements of ASCE 7-05 section 6.5.12.4.4.
Comment remains. No design provided. WAB – 5/31/2012
22. OUT-OF-PLANE SUPPORT OF CMU
Reference the calculations and details. Please clarify how the CMU walls are restrained for the out-of-plane forces 12.11.2.1 as well the design wind forces. For the out-of-plane seismic load, the requirements of ASCE 7-05 section 12.11.2.2 must also be met.
23. LATERAL LOAD PATH
Please clarify the lateral load path from the roof diaphragm to the CMU walls. Please clarify the lateral load path for the lateral loads from the floor to the foundation. Reference ASCE 7-05 section 12.1.3 and AAC section 23.10.104.8.
24. CONCRETE FLOOR
Please indicate the concrete floor thickness and reinforcement requirements or clarify where this information has been provided. Reference AAC section 23.10.104.8.
25. STATEMENT OF SPECIAL INSPECTIONS
Please provide a statement of special inspections with the information required by IBC Chapter 17. The statement of special inspections must include both the type and frequency of inspections. Reference to this document is not sufficient to resolve this comment.
Comment resolved. The statement of special inspections has been attached to the plans. WAB – 5/31/2012
26. SPECIAL INSPECTORS
Please provide a letter from the Owner indicating who they will be hiring to provide special inspections on this project. The special inspector(s) must be licensed by MOA in the type of inspection(s) to be performed.
Comment remains for kiosk. Please provide certification permitting fabrication without special inspections. Certification must be through IAS, or AISC (for steel) or other well known established agency. WAB – 5/31/2012
Please provide a written response to the comments and include one copy of additional or revise calculations and two copies of additional or revise drawings. While not required it is extremely helpful to the reviewer if the response indicates where in the submittal each comments has been addressed.
All submittals should be sent to the permit manager.
