In contrast, Quick Anchor relies on the posting of the anchor rods in tension. If the anchor rods are not sufficiently tensioned, where a backup of the anchor rod can share the forces, the software assumes that there is no post tension applied and the software considers the full capacity requirement for the group. If the anchor rods are in compression but cannot take the load alone, the anchor group will be post tensioned to avoid shear, and there will be no post tensioning of the anchor rods.
Example Problem 1 illustrates the differences between all of the applications. In each case, the stress values (shown in the process graphic area or points in the output graphic window) are identical for the installed anchor. However, different highlights were selected to represent the results found in each software application. The software using product design values used the anchor diameter to determine which configuration to highlight, and then applied the appropriate span. The software using anchor rod section modulus values used the infinite span method to determine which configuration to highlight.
The primary difference between topologies is the product selection and how the anchor is applied. In addition, the presence or absence of a base plate provides different stress values. While this demonstrates the difference between software that considers flexure compared to software that does not, research other data points.
The results obtained from this example differ because of the way the software has been set up. In general, if a load is applied at a certain location, by a certain moment, the software should apply the load to a group of anchors. The software should not apply a load to a single anchor.