In structural grain storage design, according to the plane of rupture criterion, a grain bin is classified as a 'deep bin' (silo) rather than a 'shallow bin' when:
Options:
(A) The plane of rupture starting from the bottom of the wall intersects the opposite wall before reaching the top free grain surface
(B) The plane of rupture intersects the top free grain surface before reaching the opposite wall
(C) The height of the bin is strictly less than its diameter
(D) Wall friction between the grain and the bin wall is assumed to be exactly zero
Answer Key:
A
Step-by-Step Solution & Explanation
By definition, a bin is classified as a deep bin when the plane of rupture intersects the opposite vertical wall before intersecting the top free grain surface. In deep bins, side wall friction carries a large fraction of the vertical grain weight (calculated via Janssen's equation or Airy's deep bin formula).