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Header | Description |
|---|---|
Add initial bow to reported deflections | If checked, the initial deflections will be included in the reported total deflections. The initial deflections (defined by the additional bow the user input and bow due to prestressing camber) always affects the P-Delta analysis. |
Additional bow | If this number is non-zero then the nodes of the panel are adjusted to create a deflection of this magnitude at the mid-height of the panel. The rest of the nodes in the panel are then arranged to fit a 4th order equation of the deflection for a uniformly simply supported beam under a uniform load. For sign convention, a negative initial bow moves the panel toward the interior, while a positive bow moves the panel toward the exterior. |
Total Typical deflection limit: L / | Sets the limit for deflection multipliers for both total and live load deflections. The deflection limit is always L divided by the inputted value. This value is used for all non-cantilevered spans. |
Cantilever deflection limit: L / | Sets the limit for deflection multipliers for both total and live load deflections. The deflection limit is always L , as defined above, divided by the inputted value. This value is used for all cantilevered spans. |
Check deflections on cantilevers | If checked, the software will check deflections against the defined limit for all cantilevers and parapets. |
Elastic Analysis
Header | Description |
|---|---|
2nd order effects | The user can select from P-Delta, Moment Magnification, or None. See the Engineering Theory for a discussion of these analysis procedures. |
Analysis beta d | When P-Delta has been selected, the user can then select the type of Beta d value used, non-sway or sway (see ACI 318 for a discussion of these two factors). The user can also select to input their own Beta d factor used in the analysis. |
Crackling Limit | Multiplier used to compute the modulus of rupture for the structural analysis. Settings this value to 0 will force the program to assume the member is cracked at all locations in the structural analysis. This input is separated from the Class U / Modulus of Rupture inputs because those values are used for design calculations where this input is used for analysis calculations. |
Allow cracks to close | When performing the cracking analysis, cracks are iterated until the moment of inertia for all sections does not change. This means cracks are recomputed for each cross section every iteration. If unchecked, once a section is cracked it’s section properties can only decrease due to further cracking, they can never close and increase section properties. |
R-Value Calculation
For information on the thermal analysis, see the PCI Design Handbook 11.1.
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