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Round 1 Bowling and Amusement 12/09/2024 Paradigm Design <br />Main Place Mall Expansion Grand Rapids, MI <br />Santa Ana, California <br />Project #2309147GR <br />1.Frame: Steel, fabricated with a connection for an upper threaded hanger rod and an <br />opening on the underside to allow for a maximum of 30 degrees of angular lower hanger- <br />rod misalignment without binding or reducing isolation efficiency. <br />2.Dampening Element: Molded, oil-resistant rubber, neoprene, or other elastomeric <br />material with a projecting bushing for the underside opening preventing steel to steel <br />contact. <br />2.14 SPRING HANGERS <br />A.Combination Coil-Spring and Elastomeric-Insert Hanger with Spring and Insert in <br />Compression: <br />1.Frame: Steel, fabricated for connection to threaded hanger rods and to allow for a <br />maximum of 30 degrees of angular hanger-rod misalignment without binding or reducing <br />isolation efficiency. <br />2.Outside Spring Diameter: Not less than 80 percent of the compressed height of the spring <br />at rated load. <br />3.Minimum Additional Travel: 50 percent of the required deflection at rated load. <br />4.Lateral Stiffness: More than 80 percent of rated vertical stiffness. <br />5.Overload Capacity: Support 200 percent of rated load, fully compressed, without <br />deformation or failure. <br />6.Elastomeric Element: Molded, oil-resistant rubber or neoprene. Steel-washer-reinforced <br />cup to support spring and bushing projecting through bottom of frame. <br />7.Adjustable Vertical Stop: Steel washer with neoprene washer "up-stop" on lower <br />threaded rod. <br />8.Self-centering hanger-rod cap to ensure concentricity between hanger rod and support <br />spring coil. <br />2.15 SNUBBERS <br />A.Description: Factory fabricated using welded structural-steel shapes and plates, anchor bolts, <br />and replaceable resilient isolation washers and bushings. <br />1.Anchor bolts for attaching to concrete shall be seismic-rated, drill-in, and stud-wedge or <br />female-wedge type. <br />2.Resilient Isolation Washers and Bushings: Oil- and water-resistant neoprene. <br />3.Maximum 1/4-inch air gap, and minimum 1/4-inch-thick resilient cushion. <br />2.16 RESTRAINT CHANNEL BRACINGS <br />A.Description: MFMA-4, shop- or field-fabricated bracing assembly made of slotted steel <br />channels with accessories for attachment to braced component at one end and to building <br />structure at the other end and other matching components and with corrosion-resistant coating; <br />rated in tension, compression, and torsion forces.