The test program for each specimen included two phases.
First, each test specimen was subjected to cyclic loads to
simulate fatigue loadings commonly applied to highway
bridge structures in service. Figure 5 shows a photograph
of this test setup. Each test specimen was supported on a
39 ft (12 m) span by roller supports. Vertical loads were
applied symmetrically 13.5 ft (4.11 m) from each roller.
Loads were applied by servo-hydraulic controlled actuators
operated under load control. The pair of 100 kip
(445 kN) capacity actuators applied loads to the top of the
deck along the centerline of the girder through 12 × 12 in.
(300 × 300 mm) elastomeric pads backed by steel plates.