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is devoted to frequently asked questions (FAQ) related to generalized displacements. |
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Can
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generalized displacements
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approximate joint rotations in a solid model
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?
Yes, suppose this will work for a model consisting only of solid elements. Suppose the position vector from joint 1 to 2 is given by (dx, dy, dz). Then you can define a A generalized displacement of type rotation may be defined for the rotation about the Z axis, then given as Rz = dx*dUy – dy*dUx. Thus the coefficients to define the Coefficients which define generalized displacement are for Joint 1 : are then (dy, -dx, 0, 0, 0, 0), and for Joint 2: , (-dy, dx, 0, 0, 0, 0).
Separate If necessary, separate rotational generalized displacements can be defined for Rx and Ry, if needed. Once defined, these can be plotted plots and tabular output in tablesare available.
Can
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generalized displacements
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calculate
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strain?
Yes, you can use generalized displacements (defined via Define > Generalized Displacements) to calculate the strains from joint displacements for elements for which the strains are not directly reported by SAP2000when element strain is not directly reported, strain values from joint displacements may be calculated using generalized displacements. This is done through the Define > Generalized Displacements menu.