Impact Loading Test of Rubber-Rolled Pin
The impact loading test using dropping weight machine was carried out by pushing down the loading plate which was linked with the connecting plate by bolts as shown in Figure 15. The steel pin and rubber-rolled pin pass through the connecting plate and cut them off by pushing down the loading plate. The connecting plate specimen (SS400, thickness 9 mm) is a half size of actual shape as shown in Figure 16 and its cross section is equal to the connecting plate which is used in the bridge of about 20 m span length. The pin specimens (SC35) were used as two types as shown in Table 5. Type A is the ordinary steel pin and type B is the rubber-rolled pin using LFRR in which they have the same total diameter of 60 mm. The load was measured by the load cell and displacement was measured by the laser type sensor, respectively. In impact test, the responding strains of connecting plate were measured by the 3-axial gauges which were arranged as shown in Figure 17.
The falling weight was set at W = 1 kN and falling height was set at H = 10-150 cm (impact velocity V = 140-540 cm/sec).