By Comite Euro-International Du Breton
Smooth fastening thoughts are more and more getting used to move rather a lot into concrete and masonry buildings. even so truth wisdom of the behaviour of such platforms is especially restricted and there's no mostly authorised layout strategy
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Additional resources for Fastenings to concrete and masonry structures : state of the art report
Sample text
4) are plotted against the data using two boundary values for the ratio of head diameter to embedment depth djhef. 5) shows the characteristic strength to be - 0 . 8 1 times the mean value. Factors to account for the effects of spacing and edge distance are based Fig. 11. 9 mm \ 3 CO Q. 3 Fig. 12. 6 s/4/lef on an approach originally developed by Eligehausen & Pusill-Wachtsmuth (1982) (Fig. 12). Two boundary conditions are assumed for anchor spacing. (a) For a theoretical centre-to-centre anchor spacing ofs = 0, the capacity of a multiple anchor fastening is reduced to the capacity of one anchor.
3). Theoretically, this failure mode may also occur if the spacing between headed anchors in a group is too small (Fig. 5). The resistance to splitting failure increases with increasing member size, edge distance, spacing and concrete tensile capacity. 6. Load—displacement behaviour. Load—displacement curves for headed anchors exhibiting concrete-cone failures are shown in Fig. , 1988). As before, the total displacements measured at the surface of the concrete are equal to the total steel strain plus the elastic concrete strain added to any displacement (slip) of the anchor head caused by crushing of the concrete.
0 i a 0 3 d « . 1 ii Hi' i1 • o °C 0 ( 0 •••• ,'7 c 0 0 0 O | . ' • p* • 77777771 0 - 0. 0 VTTT 4 0 C 0 0 • / • > „ • 0 0 o9 0 0 ' ;o°o° r. 0 0 s » \ " 0 IIIIIill (a) 0? Fig. 17. '. °. (b) (c) A complete installation is achieved when neither the screw nor the sleeve will turn with continued application of torque. (d) Once installed, sleeves cannot be reused or reinstalled without significant impairment of their load-carrying capacity. Plastic anchors expanded with a driven expansion element are also available (Fig.