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1620.2.3 Discontinuities in Vertical System
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Structures with a discontinuity in lateral capacity, vertical irregularity Type 5, as defined in Table 1616.5.1.2, shall not be over two stories or 30 feet (9144 mm) in height where the "weak" story has a calculated strength of less than 65 percent of the story above.
Exception: Where the "weak" story is capable of resisting a total seismic force equal to the over-strength factor, Ωo, as given in Table 1617.6.2, multiplied by the design force prescribed in Section 1617.5, the height limitation does not apply.
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