LATERAL PRESSURES DURING FILLING OF A FULL-SCALE GRAIN BIN

Lateral pressures were measured in two different corrugated walled gra in bins using load cells mounted on the wall at discrete locations. Bi n A was 12.8 m (42 ft) in diameter and 17.1 m (36 ft) tall while bin B was 11.0 m (36 ft) in diameter and 14.0 m (46 ft) tall. Tests were co nducted with corn. The lateral pressures measured in the 12.8 m diamet er bin were only slightly larger than those measured in the 11.0 m dia meter grain bin. In the 12.8 m diameter bin, the largest average later al pressure was 28.2 kPa (589 lb/ft(2)) at a grain depth of 15.2 m (49 .9 ft) while in the 11.0 m diameter grain bin the largest average late ral pressure was 26.9 kPa (562 lb/ft(2)) at a grain depth of 11.9 m (3 9.1 ft). Best fit values of mu and k were determined using Janssen's e quation and the SAS NLIN procedure. For Bin A values of 0.6 and 0.52 w ere determined for mu and k, respectively. For Bin B best fit values o f 0.55 (mu) and 0.52 (k) were determined. For both bins, the pressures estimated during filling by both EP433 and DIN1055 were slightly larg er than the lateral pressures measured by the load cells for almost al l grain heights. For these conditions, EP433 produced a slightly more conservative design at large grain heights than that of DIN1055.