Analysis Options
- Tim Kostka
This tab covers the Analysis Options for Eriksson Pile.
General Options
Option | Description |
|---|---|
Effective Length Factor, k | Effective length factor for piles/columns. |
EI Multiplier | Member stiffness multiplier. |
Slenderness Method | Chooses which method will be used to calculate slenderness in the member. ACI uses LRFD 9th Ed. 5.6.4.3, where Secant uses the secant method as described in the ACI Journal, Arthur R. Anderson and Saad E. MOUSTAFA, “Ultimate Strength of Prestressed Concrete Piles and Columns” |
Show Mild Slenderness | This options enables the slenderness method chosen to be overlaid on the Mild Interaction Diagram. |
Seismic Detailing
Options that allow for a more accurate report on seismic detailing. If these options are omitted the worst case is assumed and reported.
This will not affect the pile analysis. These options are not required but will make the Spiral Summary more accurate.
Option | Description |
|---|---|
Depth of Pile in Soil | The length of the pile that is under the surface of the soil. This is used in ACI seismic detailing. Used in ACI 318-19 18.13.5.10.5 |
Distance to Zero Curvature | This is the distance of the pile to the first point of zero curvature. This is used in ACI seismic detailing. Used in ACI 318-19 18.13.5.10.5 |
Part of Seismic Resisting System | Is the pile part of the seismic resisting system. Spiral provisions vary depending on whether the pile is part of the structure’s seismic-force-resisting system. This is used in PCI seismic detailing. |
Shear
Values that can be used to override the defaults in the LRFD 5.7.3.3 shear equations used by the program.
Option | Description |
|---|---|
Manually Define Values | Allows the user to unlock all variables in the shear calculations |
bv | Effective web width taken as the minimum web width within the depth dv as determined in LRFD Art. 5.7.2.8 |
dv | Effective shear depth as determined in LRFD Art. 5.7.2.8 |
β | Factor indicating ability of diagonally cracked concrete to transmit tension and shear as specified in LRFD Art. 5.7.3.4 |
λ | Concrete density modification factor as specified in LRFD Art. 5.4.2.8 |
θ | Angle of inclination of diagonal compressive stresses as determined in LRFD Art. 5.7.3.4 |
α | Angle of inclination of transverse reinforcement to longitudinal axis |
Pitch | Spacing of transverse reinforcement measured in a direction parallel to the longitudinal reinforcement |
λduct | Shear strength reduction factor accounting for the reduction in the shear resistance provided by the transverse reinforcement due to the presence of a grouted post-tensioning duct. 1.0 for ungrouted post-tensioning ducts |
Resistance Factors
Option | Description |
|---|---|
Shear, ϕshear | The resistance factor for shear. |
Flexure, ϕFlex | The resistance factor for flexure. |
Compression, ϕComp | The resistance factor for compression. |
Service Stresses
These are multipliers that return service stress limits.
Option | Description |
|---|---|
Prestressing Applied | Choose to display prestressing added to demand or the allowable in the Performance Summary. |
Compression Multipliers
Option | Description |
|---|---|
Sustained | Compression multiplier for sustained loads limit. |
Service | Compression multiplier for stripping and erection limits. |
Transfer | Compression multiplier for transfer stress limit. |
Sustained + Transient | Compression multiplier for sustained + transient loads limit. |
Tension Multipliers
Option | Description |
|---|---|
Sustained | Tension multiplier for sustained loads limit. |
Service | Tension multiplier for stripping and erection limits. |
Transfer | Tension multiplier for transfer stress limit. |
Sustained + Transient | Tension multiplier for sustained + transient loads limit. |