My company must often anchor from floor to ceiling with a strip of plate (such as a door jamb). The predominate load is shear (parallel to the vertical wall). Almost every time we do, we have trouble estimating the amount of concrete that should be included above (at the ceiling) and below(at the floor). When dealing with our standard loads, Profis indicates that many hundreds of inches above and below the anchor plate is required. This makes sense if you draw the concrete cone from the top an bottom most anchor in the group. However, i think that this shear stress will actually transfer to the floor and possibly the ceiling depending on the surrounding conditions. Has this issue come up before? If you assume that the concrete just stops at the floor and ceiling, a wall would be able to withstand almost no load. From experience we know that this is not the case. Any thoughts would be appreciated.
Brandon,
PROFIS Anchor is limited to performing calculations in a single slab of concrete. It will not take into consideration additional support from surrounding structures.
To further assist with your question, it would be best if you could supply a typical drawing and a copy of the PROFIS design file to Hilti’s technical services department at HNAtechnicalservices@hilti.com.
Lisa