The Ontario Building Code | Additional System Restrictions
4.1.8.10. Additional System Restrictions
(1) Except as required by Clause (2)(b), structures with a Type 6 irregularity, Discontinuity in Capacity – Weak Storey, as described in Table 4.1.8.6., are not permitted unless IEFaSa(0.2) is less than 0.2 and the forces used for design of the SFRS are multiplied by RdRo.
(2) Post-disaster buildings shall,
(a) not have any irregularities conforming to Types 1, 3, 4, 5 and 7 as described in Table 4.1.8.6., in cases where IEFaSa(0.2) is equal to or greater than 0.35,
(b) not have a Type 6 irregularity as described in Table 4.1.8.6.,
(c) have an SFRS with an Rdof 2.0 or greater, and
(d) have no storeywith a lateral stiffness that is less than that of the storeyabove it.
(3) For buildings having fundamental lateral periods, Ta, of 1.0 s or greater, and where IEFvSa(1.0) is greater than 0.25, shear walls that are other than wood-based and form part of the SFRS shall be continuous from their top to the foundationand shall not have irregularities of Type 4 or 5 as described in Table 4.1.8.6.
(4) For buildings constructed with more than 4 storeys of continuous wood construction and where IEFaSa(0.2) is equal to or greater than 0.35, timber SFRS of shear walls with wood-based panels, braced frames or moment-resisting frames as defined in Table 4.1.8.9. within the continuous wood construction shall not have irregularities of Type 4 or 5 as described in Table 4.1.8.6.