FAQ 001189 PT

Calculation RSTAB

How are cable structures analyzed according to the large deformation analysis in RSTAB?

Resposta

If you design a structure with beams, columns, and cable, RSTAB uses the large deformation analysis only for the cables. Cables are always designed according to the large deformation analysis in RSTAB.

The "Cable" member type in RSTAB has the effect that the calculation is carried out according to the large deformation analysis so that cable chains do not result in a failure as it would be the case for the "Tension" member type. This is the major difference to the "Tension" member type, because cables also resist only tension and fail when subjected to negative axial forces. Thus, cables are automatically calculated according to the large deformation analysis taking into account longitudinal and transverse forces.

The tension members and cables have a stiffness in the longitudinal direction. In addition, the "Cable" member type has also an ideal stiffness in the transverse direction, which is 1/200 of the longitudinal direction.

This stiffness of the transverse direction is necessary to, for example, calculate a cable chain line. Such a chain line would not be possible with the "Cable" member type.

To correctly determine the cable sag line of deformed cables, you must model several connecting cable members. A cable chain line is created. If you don't define a division, the cable sag line is not determined and the results are not plausible.

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