PREDATOR CONTROL STRUCTURE AND COVERS FOR THE CONCRETE RACEWAYS LOCATED AT THE BERLIN STATE FISH HATCHERY .

2026-11-03

1 . Dimensions : a . 18 ’ wide ( outside dimension ) b . 150 ’ long ( outside dimension ) c . 9 ’ 7 ” peak height ( outside dimension ) d . 6 ’ eave ( wall ) height 2 . Frame system : a . Inline galvanized primer and powder coated steel framing system . i . Aluminum frames are not acceptable . ii . Steel must be sourced and manufactured within the United States . iii . Steel tubing must be minimum 50ksi yield material . iv . Arch chords must be made from a minimum of 2 . 5 ” x 2 . 5 ” square steel tubing v . Arches must be maximum 2 . 5 ’ on center . b . Frame system must have a minimum of 2 rows of purlins in between each arch . i . All purlins must be made from a minimum of 1 . 510 ” round tubing . c . Perimeter Base Frame System : i . Frame system must include full perimeter base except across end openings . ii . Base frame must be made from minimum 2 . 0 ” square tubing . d . End uprights i . The frame system must have a minimum of ( 4 ) 2 . 5 ” x 2 . 5 ” square vertical uprights on the end . 3 . Cover material a . All cover and end walls must be made with minimum 18oz PVC material . b . Vinyl material must be certified to meet NFPA 701 large - scale test , CPAI - 84 and ULC 109 . c . Vinyl material must be certified as no growth mildew resistance to ASTM G21 . d . No rope , ratchet strap , cinch strap , or double d - ring tensioning systems allowed in cover panels or end panels . e . Supplier must include a price for any proprietary tools necessary for tensioning the fabric to the frame . 4 . Environmental and engineering requirements a . Wind load : 90 mph 3 - second gusts per risk Category II b . Ground Snow load : 88 pounds per square foot c . Engineering calculations : i . Climatic and geographic conditions must be based on Allied Environmental Conditions and Test Publications ( AECTP ) – 230 ( Edition 1 ). ii . The engineering must be based on the following methodologies and technical input references must be used in the certified engineering process for the building to be considered : 1 . 2024 International Building Code ( IBC ). 2 . AISC Manual of Steel Construction , 15th edition . 3 . ASCE Standard , Minimum Design Loads for Building and Other Structures , ANSI / ASCE 7 - 16 . 4 . AISC Design Guide 24 : Hollow Structural Sections Connection Manual iii . A RISA - 3D program must be used to solve member forces and reactions at support points . An Allowable Stress Design ( ASD ) approach must be used to analyze the structural members . iv . Foundation anchors must be assumed to be pinned with rotational support about the axis parallel to the arch . Translational lateral degrees of freedom must be unyielding . v . The structural steel tubing shall be manufactured in accordance with ASTM - A - 500 , ASTM - B - 117 , ASTM - B6 and ASTM - G - 23 . All welding shall be performed prior to shipment using MIG welding . vi . Coefficient of friction as it relates to snow shedding shall not be used when calculating snow capacity

New Hampshire

2026-04-28