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Eriksson Beam uses 5 loading stages
Stage | Loads | Material Properties | Section Properties |
|---|---|---|---|
1 | Self Weight + Prestress | Initial | Gross |
2 | Non-Composite DL | Final | Gross |
3 | Topping Weight | Final | Gross |
4 | Composite DL | Final | Composite |
5 | All Others | Final | Composite |
The section properties will change to the cracked section properties if the applied moment exceeds the cracking moment. However, only sections under a positive moment will crack. In example, if Stage 1 cracks along the top of the member from the prestressing, the stage will still use gross section properties at that location.
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Deflection (downward), applied to the elastic deflection due to the self-weight at release of prestress
Camber (upward), applied to the elastic camber due to prestress at the time of release of prestress
Deflection (downward), applied to the elastic deflection due to superimposed dead load only
Deflection (downward), applied to the elastic deflection caused by the composite topping
Condition | Factor | Equation # |
|---|---|---|
Erection: SW Deflection | 1.85 | 1 |
Erection: P/S Camber | 1.80 | 2 |
Final: SW Deflection (non-comp) | 2.70 | 3 |
Final: SD Deflection (non-comp) | 2.45 | 4 |
Final: SW Deflection (non-comp) | 3.00 | 5 |
Final: SW Deflection (comp) | 2.40 | 6 |
Final: P/S Camber (comp) | 2.20 | 7 |
Final: SD Deflection (comp) | 3.00 | 8 |
Final: Topping Deflection (comp) | 2.30 | 9 |
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In ACI 318-71 9.5.2.3, the base factor used to modify initial deflections to account for long-term effects was calculated using the following equation:
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