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As of SAP2000 V14.0.0, shell reinforcement design is based on Eurocodes. The content of this article will be updated accordingly.
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The [SAP2000|sap2000:home] formulation for [shell|kb:Shell] reinforcement design is based on the following publications:

* Brondum-Nielsen, T. (1974). [Optimum Design of Reinforced Concrete Shells and Slabs |http://www.byg.dtu.dk/upload/institutter/byg/publications/rapporter/abk-r044.pdf], _Report NR.R 44_, Technical University of Denmark, Copenhagen, Denmark.

* Marti, P. (1990). [Design of Concrete Slabs for Transverse Shear |http://www.concrete.org/PUBS/JOURNALS/OLJDetails.asp?Home=SJ&ID=3137], _ACI Structural Journal, 87_(2), 180-190.

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The formulation is documented in the technical note Concrete Shell Reinforcement Design, available through Help > Documentation > Technical Notes > Concrete Shell Reinforcement Design.


h1. Setting shell design parameters

Default shell design parameters, such as rebar cover, may be modified through Define > Section Properties > Area Sections, as shown in Figure 1:

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!Concrete_shell_section_design_parameters.png|align=center,border=0!

{center-text}Figure 1 - Set default shell design parameters{center-text}


h1. Reviewing results

After analysis is run, design parameters may be reviewed through Display > Show Forces/Stresses > Shells by selecting the component type Concrete Design, as shown in Figure 2:

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!Member_forces_shells_concrete_design.png|align=center,border=0!

{center-text}Figure 2 - Review design parameters{center-text}

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ASt1 represents reinforcement in the 1 direction of the [shell|kb:Shell], and ASt2 is in the 2 direction. The reinforcement calculated for either the top or bottom face of the shell object may be displayed separately, as shown in Figure 3:

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!Concrete_shell_design_rebar_areas.png|align=center,border=0!

{center-text}Figure 3 - Reinforcement for top or bottom surface and orientation{center-text}

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*TO DO:*
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Update shell reinforcement design with current Eurocodes.
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