Any Structure can be classified as B(Beam or Bernoulli)regions and D(disturbed/discontinuity) regions. B-regions are in which Bernoullis hypothesis of straight-line strain profile applies. D-regions are parts of structure with a complex variation in strain profile. D-regions include portions near abrupt changes in geometry or concentrated forces. Based on St.Venants principle, the extent of D-region spans about one section depth of the region on either side of the discontinuity. In conventional design practice, B-regions are designed accurately but D regions are designed using ...