Ring girders

To design the legs, base plates, cross-bracing, anchor bolts, ring girder, and foundations, it is necessary for the designer to determine the actual distribution of forces. 

Figure 4-9. Loading diagram for a ring girder vertical forces on a ring beam. Horizontal Forces on Ring Beam...

Figure 4-14. Dimensions and loadings for various ring girders.

Figure 6-5. Dimension, forces, and loading at a ring girder.

Figure 6-7. Loading diagram for a ring girder sheii to beam.

Step 2 If a ring girder is required, design the girder to resist all load conditions. 

Step 2 The shell stresses due to horizontal loading are exceeded and a ring girder must be added. 

The containment is a prestressed reinforced concrete structure in the shape of a cylinder with a torispherical dome and a flat foundation mat. The cylindrical portion of the containment is prestressed by a post tensioning system consisting of horizontal tendons and vertical tendons. The dome is prestressed with crossed tendons that are anchored at the dome stiffening ring girder. The foundation mat is conventional reinforced concrete. 

R = distance from of dome to external edge of ring girder... 

Compute Elev. of Anchorage Point on Ring Girder ... 

The flat portion of the DOME-RING-GIRDER will be assumed to be 10 -3 (3.1242 m) wide in order to satisfy anchorage requirement. Therefore, the X-Y coordinates of points A are... 

To verify the point of Tangency of the Dome-Ring-girder Intersection for final design notes. 

To determine the proper spacing of Dome Tendons to obtain Equal Areas of NO Prestress in Ring Girder Region size of Dome from Bulds. 

Ring Girder. Volume of ring girder will be determined by sealing from sketch sh.6... 

To recalculate the friction loss sustained by vertical Tendons from Tendon Gallery Base Slab to Ring Girder Anchorage. This loss is necessary for calculation of required vertical prestress. 

Example 12.5. The ring girder shown in Fig. 12.14 is supported at eight points. If IF = 200 kips, find the forces in the ring at the supports and at the point of maximum torsional moment. 

T = tensile force on foundation Tf = torsion moment in a ring girder t = thickness... 

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