Thin Shell and Folded-Plate Construction

NYC Admin. Code tit. 27, ch. 1, subch. 10, art. 10

in effect

NYC Admin. Code § 27-632 General requirements.

§ 27-632 General requirements. Thin shell and folded-plate construction may be used for buildings or portions of buildings, as required in this section and subject to the provisions of this subchapter. The applicable provisions of the several reference standards relating to allowable stresses and the use of structural materials shall apply except as modified in this section.

NYC Admin. Code § 27-633 Analysis.

§ 27-633 Analysis. (1) Unless otherwise permitted by the commissioner, stresses, displacements, and stability of thin shell and folded-plate structures shall be determined on the basis of the assumption of elastic behavior. The shell or plate may be assumed to be homogeneous and isotropic. (2) The analysis for stability shall consider large deflections, creep effects and the deviation between the actual and theoretical shell surface.

NYC Admin. Code § 27-634 Thin concrete shells.

§ 27-634 Thin concrete shells. The provisions of sections 403, 404 and 405 of reference standard RS 10-45 shall apply with the following modifications. The remaining sections of reference standard RS 10-45 shall not apply. (1) The advisory provisions of this standard shall be considered as mandatory. (2) The minimum ultimate strength of concrete for thin shells shall be three thousand psi. (3) Change all references to "the building code (ACI 318-63)" to "reference standard RS 10-4".

Source: City of New York, Charter, Administrative Code and Rules (American Legal Publishing XML export, codelibrary.amlegal.com)URL: https://codelibrary.amlegal.com/codes/newyorkcity/latest/NYCadmin/0-0-0-51097Fetched: 10/24/2026