Handling
- Tim Kostka
This tab covers the handling input of the program.
Stage Options
Input | Description |
|---|---|
Include Stage | Checking this box will include the corresponding stage for the analysis. |
Impact Factor | Impact factor is applied to all self weight for the analysis. The impact factor is not included when checking lifter capacities. |
Concrete Strength | Option to use either the release strength, stripping strength, or the 28-day strength of the concrete. |
Stress Limits | Service stress multipliers used in the Performance summary allowable calculations. |
Lift Type | Static Lift: Will assume all lift locations act as a pin. Rolling Block: Will assume a sling is run between sets of connectors. This sling normalizes forces between connectors. The forces are normalized between for an entire crane line. For example, if doing a 4-high lift using 2 crane lines, the first two lifters will have the same reaction and the second two lifters will have the same reaction. Where if one was doing a 4-high lifting on a single crane line, all 4 lifters would have the same value. |
Sling Angle | Angle used to compute the lateral force at a given lifter. This value will not effect the analysis and will only be used to estimate the shear force a connector is exerting on the panel. |
Tilt Angle | The angle to tilt the member for the analysis. The tilt angle is used to change the direction of the applied self weight. It does not change how lifter forces are computed as a more accurate computation requires more data than is provided. Tilt angle is only available when a ground reaction is included. |
Add Ground Reaction | Option to add an a ground reaction on the member. If the ground reaction ends up being negative (in tension), consider removing the ground reaction. |
Face Lifters on Single Crane Line | Â Uses a single crane line for the face lifters. |
Assume top Edge Lifters Carry Panel Weight | This option is used to assume the panel will be held carrying it’s entire weight on the top edge lifters. Checking this option will override the computed tension in the connection to be the panel weight divided by the number of edge lifters. |
Lifter Capacities
The software can also be instructed to check lifter capacities. If told to do so the user can input capacities for face lifters, side edge lifters, and top edge lifters. The analysis will only check those which correspond to the given lifter locations. The lifter’s capacities can either be entered on the fly or imported from the Lifter Library. For edge lifters, the reported vertical reaction is assumed to act as a shear force and is not combined with shear due to the sling angle. Capacities are checked using un-factored reactions.
Lifter Locations
Face / Top Edge Lifters
This option allows for one column of lifters to be used down the center of the pile or two columns of lifters selected allowing the input of two lateral locations manually.
Support Locations
This section allows for the input of a table of lifter locations to be input. Table modification buttons are shown in the image above. Clicking on the green plus sign will add one additional row to the table which can be manually edited. The corresponding stage's checkboxes show which stage the lift point will be used in. The red minus button will remove the currently selected row and the two boxes will copy the currently selected row. The wand button will expand into a default locations wizard.
More information on the Default Locations wizard can be found at Default Locations Wizard .
Datums
When defining the rows and column, the user can use either end of the panel as a datum. When selecting a datum the location positive direction is towards the opposite side of the pile. For example, if the end of the panel is the datum, a positive location is towards the start.