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TW Catalogue EN Int. 03-2015

2503/2015 11 WT Joining timber rafters 3/6 Kd FK,Rd <_ 1 or Kz,d cos () · FK,Rd <_ 1 or Ky,d sin () · FK,Rd <_ 1 Kz,d + Ky,d (cos () + sin ()) · FK,Rd <_ 1 Kd Design value of coupling force Kz,d Design value of coupling force at right angles to the roof surface Ky,d Design value of the coupling force parallel to the roof surface FK,Rd Design value of the coupling force resistance (see table on page 4)  Roof pitch angle Defining the fastener Design proposal Fastener length L (in mm) depends on width b (7 cm-16 cm) and height h (14 cm-24 cm) of the smaller rafter cross section. The corresponding fastener lengths L are listed as a function of rafter dimensions in the adjoining table. b h b[cm] h[cm] 7 8 9 10 12 14 16 14 160 160 160 160 160 160 160 16 160 190 190 190 190 190 190 18 160 190 220 220 220 220 220 20 160 190 220 245 245 245 245 22 160 190 220 245 275 275 275 24 160 190 220 245 300 300 300 26 160 190 220 245 300 330 330 28 160 190 220 245 300 330 330 Design In the case of only vertical external loading, e.g. inherent load, snow load, the coupling force acts vertically (K = Kv). In each case one of the following must be verified. α Kz Ky Ky K Kz K=Kv Lot α Ky Ky Kz Kz K K Lot Lot sgsclamp d1 dk In the case of non-vertical external loading, also combinations with wind loads, the coupling force does not act vertically. Components Kz and Ky must be established and the following verified. 11. Technical documentation and data sheets 78910121416 14160160160160160160160 16160190190190190190190 18160190220220220220220 20160190220245245245245 22160190220245275275275 24160190220245300300300 26160190220245300330330 28160190220245300330330

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