Title: Listeskrue 3,5x45.pdf
Design of the screwsThe screws are loaded predominantly axially. The axial tension force in the screw may be calculated fromthe shear loads of the roof Rs:T SR S cosThe load-carrying capacity of axially loaded screws is the minimum design value of the axial withdrawal capacity of the threaded part of the screw, the head pull-through capacity of the screw and the tensile capacity of the screw. In order to limit the deformation of the screw head for heat insulation thicknesses over 200 mm or with compressive strength below 0,12 N/mm², respectively, the axial withdrawal capacity of the screws shall be reduced by the factors k1 and k2:(cid:1832)(cid:3028)(cid:3051),(cid:3080),(cid:3019)(cid:3031) (cid:3404) (cid:1865)(cid:1861)(cid:1866)(cid:1748) (cid:1750) (cid:1749)(cid:1747)(cid:1863)(cid:3028)(cid:3051) ∗ (cid:1858)(cid:3028)(cid:3051),(cid:3031) ∗ (cid:1856) ∗ (cid:1864)(cid:3032)(cid:3033) ∗ (cid:1863)(cid:2869) ∗ (cid:1863)(cid:2870) ∗ (cid:4672) ρk (cid:1750)0,8 (cid:4673) 350