How does ideCAD calculate the maximum permissible deflections according to ACI 318-19?
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Deflection calculated in accordance with “Calculation of immediate deflections” and “Calculation of time-dependent deflections” should not exceed the limits ACI 318-19 Table 24.2.2 given below.
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Member | Condition | Deflection to be considered | Deflection limitation | |
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Flat roofs | Not supporting or attached nonstructural elements likely to be damaged by large deflections Immediate deflection due to L | Immediate deflection due to maximum of Lr, S, and R | l/180 | |
Floors | l/360 | |||
Roof or Floors | Sıpporting or attached to nonstructural elements | Likely to be damaged by large deflections | That part of hte total deflection occurring after attachment of nonstructural elements, which is the sum of the time-dependent deflection due to all sustained loads and the immediate deflection due to any additional live load | l/480 |
Not likely to be damaged by large deflections | l/240 | |||
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