Responses of Random-Oriented-Fiber and Neoprene Bearing Pads Under Selected Loading Conditions
Alex Aswad and Leonard Tulin
Appears on pages(s):
abrasion; bearings; compression tests; cyclic loads; fibers; neoprene; pads; plastics, polymers, and resins; shape factor; shear modulus; shear tests; stiffness; Structural Research
Random-oriented-fiber (ROF) and neoprene bearing pads were subjected to cyclic compression and shear loading in an effort to determine their characteristics when used as bearing pads for precast parking decks. The cyclic test program included specimens in the thickness range of ¬ to « in. These specimens were subjected to compressive stress normal to the pad with both parallel and nonparallel platens and then were cycled up to 5500 times to a maximum shear strain of 70 percent their thickness. Apparent shear moduli and coefficients of lateral resistance were determined for these specimens. In addition, a few samples were tested in cyclic compression to 1500 psi and in monotonic compression to 8500 psi. The results are tabulated for easy reference. Quality control information was extracted from the manufacturer's test reports and is summarized in an appendix. Estimates of reaction displacements and rotations due to shrinkage, creep, temperature gradient, and load for a typical twin-tee are also included in an appendix.