A direct method for imposing restrictions in any direction, in matrix analysis of structures
DOI:
https://doi.org/10.3989/ic.1972.v24.i239.3255Abstract
When analysing a structure by matrix methods, it is common to come up against the problem of imposing restrictions in various directions, so that it is impossible to choose a system of Cartesian axes that will make the directions of these axes coincide with those along which restrictions are to be imposed. This work presents a general method for imposing restrictions in any direction, in a mathematically exact and direct form, modifying the stiffness matrix in the area corresponding to the nodes in which such restrictions are imposed, being the new stiffness matrix, equally symmetrical, and having singular directions.
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