Cable property definition
- @CABLE_PROPERTY_DEFINITION {
- @CABLE_PROPERTY_NAME {CblPropName} {
- @ETA_COORDINATE {η} {
- @MASS_PER_UNIT_SPAN {m00}
- @AXIAL_STIFFNESS {S}
- @CABLE_PRE_TENSION {T}
- @DAMPING_COEFFICIENT {μs}
- @COMMENTS {CommentText}
- }
- }
- }
NOTES
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The physical mass and stiffness properties of cables are defined in this section. The properties of the cable are allowed to vary along its span. For this purpose, a number of property sets nset will be defined at specific η locations along the curve defining the geometry of the cable. For a cable with constant properties, use nset = 1 and η = 0.0. For cables with varying properties, property sets must be defined at η = 0.0 and η = 1.0, with any number of additional intermediate values. All η values must appear in ascending order of η. Plots of the cable physical properties will be generated, if requested by the plotting control parameters.
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The structural properties of the cable are its mass per unit length, m00, and its axial stiffness, S.
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The cable pretension, T, is used only in static analysis as a means of overcoming the singularities associated with cable structures.
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Damping in the cable can be modeled by viscous forces Fd proportional to the strain rate, Fd = μs S de/dt, where μs is the damping coefficient, e the strain, and S the cross-sectional stiffness coefficient. Fd, e, and S are all measured in the material basis.