Rothoblaas - Plates and Connectors Page 144
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DIFFUSE AND CONCENTRATED JOINTS FORCE TRANSFER MODE Joints with cylindrical shank connectors transmit the load through high and very localised shear forces: these are transmitted in the structural elements in an uneven manner, stressing a limited volume of timber (demonstrated by the blue areas in the adjacent diagram) . Joint with cylindrical shank connectors . XEPOX epoxy adhesive and SHARP METAL technology allow to spread the load over a very wide area compared to that involved by a cylindrical shank connector . This results in a more homogeneous and less severe stress on the wood component . Joint glued with XEPOX . Joint with SHARP METAL . SCALE FACTORS Cylindrical shank connections typically have diameters between 4 and 20 mm and are loaded with forces proportional to this dimension . Since the force is concentrated, when using these connectors it is necessary to respect the minimum distances and spacing, in order to avoid fragile failures along the stressed wood fibre . In addition, when using connectors with a large diameter, there is a considerable weakening of the net cross-section of the timber elements at the drill holes . The mechanical engagement of the SHARP METAL hooked surface and the pull-through into the timber structure of the XEPOX adhesive allow a load distribution over the whole connected timber area, avoiding splitting and weakening of the cross-section . 144 | DIFFUSE AND CONCENTRATED JOINTS | EPOXY ADHESIVES AND HOOKED PLATES
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