1908.1.7 ACI 318, Section 18.2.1.
BC § 1908.1.7
Modify ACI 318 Sections 18.2.1.2 and 18.2.1.6 to read as follows: 18.2.1.2 – Structures assigned to Seismic Design Category A shall satisfy requirements of Chapters 1 through 17 and 19 through 26; Chapter 18 does not apply. Structures assigned to Seismic Design Category B, C, or D also shall satisfy 18.2.1.3 through 18.2.1.7, as applicable. Except for structural elements of plain concrete complying with Section 1908.1.2 of the New York City Building Code, structural elements of plain concrete are prohibited in structures assigned to Seismic Design Category C or D. 18.2.1.6 – Structural systems designated as part of the seismic force-resisting system shall be restricted to those permitted by ASCE 7 as modified by Chapter 16 of the New York City Building Code. Except for Seismic Design Category A, for which Chapter U8 does not apply, the following provisions shall be satisfied for each structural system designated as part of the seismic force-resisting system, regardless of the Seismic Design Category: (a) Ordinary moment frames shall satisfy 18.3.
(b)Ordinary reinforced concrete structural walls and ordinary precast structural walls need not satisfy any provisions in Chapter 18.
(c)Intermediate moment frames shall satisfy 18.4.
(d)Intermediate precast structural walls shall satisfy 18.5.
(e)Special moment frames shall satisfy 18.6 through 18.9.
(f)Special structural walls shall satisfy 18.10.
(g)Special structural walls constructed using precast concrete shall satisfy 18.11. All special moment frames and special structural walls shall also satisfy 18.2.4 through 18.2.8.
