Editing Lifter Locations
Row Locations
Any location entered here can be used for stripping, transportation, or either erection stage. Any row included for stripping or erection will place a lifter at that location for all column locations defined. If included for transportation, dunnage will be included at that location.
Columns Locations
Any location defined will will place a lifter at all rows being included for a given analysis. Columns will not change the internal forces for a given panel, only the reported reactions.
Top Edge Lifter Locations
Any location entered here can be used for stripping or either erection stage. Any row included for stripping or erection will place a lifter at the top of the panel at all defined locations. Top edge lifters are assumed to have their own crane line.
Default Rows / Columns
Rows and columns may be placed at default locations by using the ‘Set to Default’ buttons. Default locations are supported for 2-point, 3-point, and 4-point lifts. These locations can be entered and saved by the user for future use.
Datums
When defining the rows and column, the user can use either end of the panel as a datum, or the panel’s centroid. When selecting a datum the location positive direction is towards the opposite side of the panel, or towards the end / right edge if centroid is user. For example, if the end of the panel is the datum, a positive location is towards the start. If for a column the centroid is used as a datum, the right side is the positive direction.
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 on imported from the Lifter Library. For edge lifters, the reported vertical reaction is assumed to act as a shear force.
Handling Stages
Stripping and handling contains four optional stages for stripping, handling, erection, and a secondary erection. The four optional analysis stages contain the following options:
Header | Description |
|---|---|
Load Multiplier | A multiplier to be applied to all self weight. |
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. |
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. |
Concrete Strength | Option to use either the release strength or the 28-day strength of the concrete. |
Stress Limits | Option to use either the handling stress limits or the in-place stress limits. |
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. |
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. |
Add Edge Lifters | Will add in a set a lifters at the top of the panel. These connections will assume to be on their own crane line. |
Assume Edge Lifters Carry Entire Panel Weight in Tension | This option is used to assume the panel will be held carrying it’s entire weight on the lifters. Checking this option will override the computed tension in the connection to be the panel weight divided by the number of edge lifters. |