Abstract
The nuclear containment structure consists essentially of two basic shapes, the cylinder and the spherical dome. Between the dome roof and the cylindrical wall, a ring beam is designed to transmit minimum dome thrust to the perimeter wall and to introduce minimum bending moment at the intersection of the wall and roof. In the thickened portion of the dome and the ring girder, the tendons fan out to their respective anchorage positions on the outside face of the ring girder. Even with four anchorage elevations on the ring girder, the dome tendon anchorages become highly congested. The three-way tendon system has been warmly welcomed by most designers because of increasing the anchorage space to create room for tendon pockets which the post-tensioning system depends upon. In order to satisfy the dome shape and anchorage position, the choice of dome tendon profiles often results in complex geometric problems. It is the purpose of this paper to present a study of tendon geometry, to formulate the general equation such that the tendon profiles, lengths, pocket orientations, interference of dome tendon and cylindrical vertical tendon and frictional loss can be easily programmed.
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