The stud partition is made up of 18mm plywood backing, and 2 layers of 15mm plasterboard. Proposing to use M8 HHD-S, but because of the thickness of partition, remove the outer plasterboard locally to fixings, so overall thickness to be 33mm.
Generally the fixings are in groups of 4 with loads of NEd = 1.42kN, VEd = 1.062kN. Local to the cantilever(short wall) The loads are greater NEd = 6.29kN, VEd = 4.6772.
1. What minimum spacing can the anchors be installed at?
2. Are groups of bolts/loadings going to be a problem for the partition, especially the heavier loads at the cantilever, where we would require 16 bolts to get the load down to 0.4 kN pullout?
3. The partition is a mix of plywood and plasterboard. Is that going to be a problem for the bolt bearing, with the bolt possibly bearing onto the more rigid material?
Rgds
Peter Hull
Thank you for your email, the HHD-S is a light duty fixing for internal use only and based upon the requirements of the published data and your noted combined 'panel' thickness is not compatible with the available diameters of HHD-S and we cannot recommend this item for the application. As an alternative you may wish to review the HTB-2 toggle anchor which doesn't have the same restriction - datasheet attached. Due to the combination of your base materials it may be prudent to make a mock up of your wall and carry out some testing to establish the allowable loads at the preferred c/c to assess the structural stability of the base material in resisting the required loads.
