Design Shell SAP2000.pdf


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Concrete Shell Reinforcement Design

Design Information

Notations
The algorithms used in the design of reinforcement for concrete shells are expressed using the following variables:

Ast1(bot)

Reinforcement intensity required in the bottom layer in local
direction 1

Ast1(top)

Reinforcement intensity required in the top layer in local direction 1

Ast2(bot)

Reinforcement intensity required in the bottom layer in local
direction 2

Ast2(top)

Reinforcement intensity required in the top layer in local direction 2

Cb1

Distance from the bottom of section to the centroid of the bottom steel parallel to direction 1

Cb2

Distance from the bottom of the section to the centroid of the
bottom steel parallel to direction 2

Ct1

Distance from the top of the section to the centroid of the top
steel parallel to direction 1

Ct2

Distance from the top of the section to the centroid of the top
steel parallel to direction 2

d1

Lever arm for forces in direction 1

d2

Lever arm for forces in direction 2

db1

Distance from the centroid of the bottom steel parallel to direction 1 to the middle surface of the section

db2

Distance from the centroid of the bottom steel parallel to direction 2 to the middle surface of the section

dbmax

Maximum of db1 and db2

Notations

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