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H.E. Bergeron Engineers, fnc. (603)356-6936(phone} <br /> PO Box 440,2605 White Mountain Hwy (603)356-7715(fax) <br /> North Conway, M-t 0386Q-Q440 �'•�sbengineers.com <br /> March 26, 2013 <br /> Brian D'Arcangelo <br /> Cambridgeport Air Systems <br /> Engineered Systems Division <br /> 8 Fanaras Drive <br /> Salisbury, MA 01952 <br /> H_V Re: P!� No. 39607-OD <br /> CW7!•Slructurol.5urvaying Autozone Store 2418, Zephyrhilfs, FL, 33542 <br /> 2011420 CURB ADAPTER wJ Carrier 5UTCA07 unit <br /> NEB Project#2013-025 <br /> Dear Brian, <br /> As requested, H.E. Bergeron Engineers, lnc. (NEB) has analyzed the 2011420 CURB ADAPTER <br /> with the Carrier 507CA07 roof top unit, for wind and seismic capacity. Full structural drawings are <br /> not included in this repart. HEB assumes no responsibility for the wind and/or seismic rating of the <br /> existing curb or its attachment method to the building structure. <br /> Methodoloqv: <br /> All unit dimensions are based on data provided by Cambridgeporf. As requested by <br /> Cambridgepa�t, wind and seismic design were based on the Florida Building Code(FBC 2010). Wind <br /> calculations were based on a basic wind speed of 180 mph in Pasco Caunty, FL with Exposure <br /> Category C. All ca[culafions assume that the building is a one-story structure, with an ordinary steel <br /> frame, 18-ft high, on stiff sail. Cambridgeporf reports that this curb adapter will be used at the <br /> Autozone Store 2498 project, located in Zephyrhills, FL. <br /> Wind Analvsis Results: <br /> Cambridgeport requires this curb adapter to be fastened to the existing 16 gauge curb with#1Q Tek <br /> Screws. Calculations show that 8 equally spaced fasteners are required per short rail to prevent <br /> shear faifure and acF�ieve a safety factor of 1.27 based on AISC Manual of Steel Construction <br /> allowable shear values in table 1-D. Calcu]ations show that 30 equally spaced fasteners are <br /> required per [ong rail to prevent overturning failure and achieve a safety factor of 1.27 based on <br /> AISC Manual of Steel Construction allowable tension values in table i-A. Calculatians show tha# 1 <br /> tie-down bracket is required per short rail, and 2 equally spaced tie-dawn brackets are required per <br /> long rail to prevent overtuming failure at the uni#ta curb adapter connection. Rail stiffeners are not <br /> required to prevent the rails from buckling during a design base wind event. <br /> Seismic Anafvsis Results: <br /> 7he seisrnic calculations show that 8 equally spaced fasteners per short rail will prevent shear <br /> failure and achieve a safeEy factor of 149.24 based an AISC Manual of Steel Construction alfowable <br /> shear vaJues in table 1-D. The curb adapter rails will not fail due to buckling during a design base <br /> seismic event. <br /> If you have any other questions, comments, or need additional information, pfease let us know. <br /> Sincerely, -;`•;_"��"�, <br /> �-w`���>. <br /> H.E. Bergerfln Engineers, lnc. •:�`�r� - Z'-���•�` '� <br /> ,`�J ,. .�`'! '``_, %`'+'''�, <br /> � �'`- f.,:��_�'� V - � <br /> � g�- „ - . � � �� <br /> . . r <br /> �-�-;:t�;._ e.�;_ :�- _ <br /> H. Edmund Bergeron, PE . _ c_ °:_`:`�z,� Jasan C Ross, PE <br /> President _ � :�;,� �-;•�4- Seniar Project Engineer <br /> Copy: File � :,�•`L:':'t�J,`,3,GU,^5'3�-.- <br /> P Uobs1�01 J52013-025 Cambndg�parl Nulozone 51o�e.2.78 Zephyr Htlls FL�CorreSpoiidencetLlr BOArcange!o Auto-�ne Slore�2•S t B�3-?v �l doc <br />