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Structural problems in the precastconcretewalls of some large bunker silos in Albertahave raised questions about the adequacy of the 1983 CFBC design loads forhigh (over 3 m) bunker silo walls. This paper examines these design loads in lightof design procedures usedfor earth retaining walls. One of theA-frames with structural problems is analyzed to try to explain the observed cracking. Also, the preliminary results of a full-scale experiment ona bunker silowitha 4.9-m-high wall are provided. Only static wall loads have been considered thus far. The stored material was com silage with an average moisture content of about 71% at the time of loading. The average bulk density was approximately 870 kg/m3. Analysis ofthe silo frame using equivalent fluid pressures indicated the highly stressed areas. Bending moments and shear forces exceeded the strength at several points. The experiments showed that pressure increased with depth about lineraly down to the second row of sensors 1.37m from the silo floor. The rate of increase was approx imately 5 kPa/m. At the bottom row of sensors, 0.71 m from the floor, the pressure was slightly lower than that in the second row.
J.C. Jofriet, Q. Zhao, D.E. Darby, and H. Bellman 1989. BUNKER SILO WALL LOADS. Canadian Agricultural Engineering 31(2):187-193.
Canadian Society for Bioengineering