Calculate position

Lifting Bolt Parameters + wall element design: reinforcement and fixture parameters + Lifting Bolts dialog box

Depending on the option you select, the program calculates the basic position of the lifting bolts in relation to the centroidal axis as follows.
L is the total length of the wall. L1 represents the length between the centroidal axis and the left edge of the wall. L2 is the length between the centroidal axis and the right edge of the wall.

If the lifting bolts extend into the openings, they are moved beside the openings. Furthermore, the lifting bolts are moved to the nearest lattice girder or grid point if the Move lifting bolts option is selected. The program always checks the minimum edge offset and issues a warning, if necessary.

Centroidal axis + L/4

If two lifting bolts are placed, each is offset by L4 from the centroidal axis. If four lifting bolts are placed, each is created at the inner points of each third of L1 and L2.

Examples of position calculation: centroidal axis + L/4

Centroidal axis + (LMin – L*factor)

• The minimum is calculated from L1 and L2. This results in the LMin length.
• The first lifting bolt is applied to the LMin wall side using the (L*factor) offset, measured from the exterior edge of the wall.
• If four lifting bolts are required, the remaining length (LMin - L*factor) is divided into three parts and the additional lifting bolt is created in the direction of the centroidal axis using this offset.
• Finally, the lifting bolts are mirrored across the centroidal axis.

As a result, the second lifting bolt or the second pair of lifting bolts is created at the same offset to the centroidal axis as the first lifting bolt or the first pair of lifting bolts. However, the offset to the exterior edge of the wall can be greater.

Examples of position calculation: centroidal axis + (LMin – L*factor)

Centroidal axis + (LMin – LMin*factor*2)

• The minimum is calculated from L1 and L2. This results in the LMin length.
• The first lifting bolt is applied to the LMin wall side using the (LMin*factor*2 – anchor offset/2) offset, measured from the exterior edge of the wall.
  If only two lifting bolts are required, the anchor offset is zero. This produces an offset of (LMin*factor*2) for the first lifting bolt.
• If four lifting bolts are required, the additional lifting bolt is created at the anchor offset specified in the direction of the centroidal axis.
• Finally, the lifting bolts are mirrored across the centroidal axis.

As a result, the second lifting bolt or the second pair of lifting bolts is created at the same offset to the centroidal axis as the first lifting bolt or the first pair of lifting bolts. However, the offset to the exterior edge of the wall can be greater.

Examples of position calculation: centroidal axis + (LMin – LMin*factor*2)