PASS/EQUIP → Working with PASS/EQUIP → Data input → Skirt support

3.51. Skirt support

Fig. 1. Skirt support

Skirt support can be adjoined to the model’s lower head or to the cylindrical or conical casing shell. Support shell type is determined according to GOST 51274-99 (see Fig. 2).

Fig. 2. Skirt types

There is a possibility of express temperatures estimation for the support components. To do this, click the […] button in the table of loading cases. In the dialog that appears, you can select a method for the temperatures estimation (Fig. 3).

Fig. 3. Skirt components temperature estimation

A transitional section (skirt) with a material different from the support material can be input.

To set the transitional section’s dimensions and material, select and press .

Fig. 4. Transitional section

Option enables performing of supporting shell calculation of strength and stability against loads arising during mounting of the column, and selecting of additional furnishings. For this purpose, additional data should be defined (Fig. 5).

Fig. 5. Lifting scheme

Supporting assembly type and dimensions can be input by pressing .

Fig. 6. Supporting assembly

Supporting node type is determined according to GOST R 51274-99 and GOST 24757-81 (see Fig. 7).

Fig. 7. Supporting assembly types

Option enables considering influence of soil flexibility on natural vibrations period of column. At the active check, it is necessary to define area and inertia moment of foundation base, as well as irregularity coefficient of soil compression. To define geometric characteristics, there is an assistant button, which enables automatic calculation of typical foundation parameters (Fig. 8).

Fig. 8. Foundation geometric parameters

When the check is off, the foundation is modeled as built-in.

Supporting shell inspection window and fittings can be input by pressing .

Fig. 9. Supporting shell fittings

Any number of fittings (including stretched), as well as their dimensions and placement, can be input using . During supporting shell analysis, all sections will be checked and most unsafe section will be determined.

The option “Fittings reinforce the cross section” controls the way of defining the skirt cross section characteristics (when this option is enabled, the cross section is formed taking into account the walls of the fittings).

Support structure (pedestal), if present, can be input by pressing ().

Fig. 10. Column support structure dialog

The support structure can be in the form of cylindrical or conical shells or metal structure with a foundation of vertical or tilted poles.

Variant «Rigid weightless structure» is designed for cases, when pedestal parameters are not known yet, but its height is known. In this case, the pedestal is modeled by rigid link and causes no influence on the vibration period. Wind loads are calculated with consideration the pedestal height.

Fig. 11. Column support structure