5. STRUCTURAL DESIGN OF CONNECTIONS 5.2 FASTENER SPACING AND EDGE AND END DISTANCES The rules for fastener connection geometry without predrilling of LVL-P on the wide face (flatwise connections) are similar to solid wood. In LVL-C connections, the spacing between fasteners as well as end and edge distances can be smaller because the product is not sensitive to splitting, due to its cross veneers. Connections at the edge face (edgewise), however, have a risk of splitting and require larger fastener spacing and end and edge distances for both LVL-P and LVL-C. Predrilling reduces the risk of splitting and smaller spacing and end and edge distances can be used. Figure 5.4. Spacings (a1 and a2), end distances (a3,t and a3,c) and edge distances (a4,t and a4,c) for fasteners 34. Figures 5.4.–5.7. describe the spacings a1, a2, end distances a3,c, a3,t, edge distances a4,c, a4,t and angles α, β and ε in different cases of laterally loaded connections.. Their values for different faces of LVL-P and LVL-C products are given in: • Table 5.1. for nails and screws with outer thread diameter < 12 mm • Table 5.3. for bolts and screws with outer thread diameter ≥ 12 mm • Table 5.4. for dowels Figures 5.6.–5.7. and Table 5.1. give the definitions and values for axially loaded screw connections. 144 LVL Handbook Europe
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