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Input | Description |
|---|---|
f’c | Final compressive strength of the wall concrete (often referred to as the 28-day strength). |
f’ci | Concrete compressive strength at time of release of the prestress in the casting yard, or at time of stripping of members without prestressing. The release strength cannot exceed the final compressive strength. This is used for all stripping and handling analysis. It may also be used for erection (user input). |
wc | Density of the concrete used in the wall. |
Ec | Modulus of elasticity of the wall concrete at final. This value will be calculated and updated when f’c or the unit weight of the beam are changed. |
Eci | Modulus of elasticity at time of release of the prestress in the casting yard, or at time of stripping of members without prestressing. This value will be calculated and updated when f’ci or unit weight are changed. |
Type | Wall concrete type can be designated as normalweight, sand-lightweight, or all lightweight. |
Stress Stain Curve
The concrete stress strain curve comes from Collins, Michael P. and Mitchell, Denis, Prestressed Concrete Structures. This curve is used anytime the stress strain curve needs to be evaluated for the concrete, which can happen for flexure capacity.
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Input | Description |
|---|---|
fy | Yield strength of the rebar. |
Es | Modulus of elasticity of the rebar. |
Stress Strain Curve
The mild stress strain curve assumes linear elastic behavior up until yield. At that point the stress always returns the yield stress. Strain hardening is not accounted for and rupture strain is not checked.
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Input | Description |
|---|---|
fpu | Ultimate tensile strength of prestressing steel. |
Ep | Modulus of elasticity of prestressed reinforcement. |
Stress Strain Curve
The prestress stress strain curve uses the equations found in the PCI Design Handbook 8th Edition Design Aid 15.2.3. Note that in these equations, the coefficients found in the equation are solved for to account for the user defined material properties. The yield stress in the strand is assumed to be 90% of the ultimate stress.
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Load combinations can be enabled and disabled by using the include check box. Auto select load combinations will turn on only the combinations which match your load input’s load types.
Strength Combinations
Import default strength and service combinations from the currently selected specification. You need at least one strength combination to run the analysis.
Service Combinations
Import default strength and service combinations from the currently selected specification. You need at least one strength combination to run the analysis.
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