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This is Fig. 2 from the 1986 BOSOR4 user's manual paper. This slide shows finite difference discretization: the “finite difference element” on which BOSOR4/BIGBOSOR4 is based. The meridional length of the element is L; the single integration point is at the element mid-length E; the nodal degrees of freedom involved in the local stiffness, mass, and load-geometric matrices for the ith finite element are identified in the vector qi.
NOTE: Although the example displayed here is for variable nodal point spacing, the developer of BOSOR4/BIGBOSOR4 recommends that users make every effort always to specify uniform nodal point spacing within each segment in all BOSOR models.
(from STRUCTURAL ANALYSIS SYSTEMS – Vol. 2, A. Niku-Lari, editor, Pergamon, 1986, pp. 25-54)
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