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14-15 May 2007

14-15 May 2007. 1. COST E55 : Modelling the performence of timber structures Working Group 2: Vulnerability of components Timber Connections. 14-15 May 2007. 2. Round smooth nailsgels. threated nails. traditional wood screws hexagon wood screws. threated nailes. staple. bolt.

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14-15 May 2007

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  1. 14-15 May 2007 1 COST E55 : Modelling the performence of timber structures Working Group 2: Vulnerability of components Timber Connections

  2. 14-15 May 2007 2

  3. Round smooth nailsgels threated nails traditional wood screws hexagon wood screws threated nailes staple bolt Self-tapping screws • “Spax” • “SFS” • dowel dowel 14-15 May 2007 3

  4. Dowel type fasteners • European Yield Model (EYM) • K.W. Johansen (1949) • A. Meyer (1957) • parallel to grain loading • single fastener • ductile failures 14-15 May 2007 4

  5. Dowel type fasteners • European Yield Model (EYM) • K.W. Johansen (1949) • A. Meyer (1957) • parallel to grain loading • single fastener • ductile failures 14-15 May 2007 5

  6. parallel to grain loading • single fastener • ductile failures 14-15 May 2007 6 Dowel type fasteners • European Yield Model (EYM) • K.W. Johansen (1949) • A. Meyer (1957) only for parallel to grain loading

  7. F Dowel type fasteners F90  • European Yield Model (EYM) • K.W. Johansen (1949) • A. Meyer (1957) he F0 h b 14-15 May 2007 7

  8. Dowel type fasteners • European Yield Model (EYM) • K.W. Johansen (1949) • A. Meyer (1957) • parallel to grain loading • single fastener • ductile failures ? not depending on n. 14-15 May 2007 8

  9. Dowel type fasteners • European Yield Model (EYM) • K.W. Johansen (1949) • A. Meyer (1957) • parallel to grain loading • single fastener • ductile failures loading perpendicular to the grain embedment compression accumulation of stresses 14-15 May 2007 9

  10. a2 a1 • parallel to grain loading • single fastener • ductile failures ? 14-15 May 2007 10 Dowel type fasteners • European Yield Model (EYM) • K.W. Johansen (1949) • A. Meyer (1957) staggered patterns

  11. `nails 5d a2 4d minimum combination amax=2*8d to be used in equation (2) 3d 2d not acceptable d a2 0 2d 0 4d 6d 8d 10d a1 amax>2*8d if a2 > 5d and a1 > 16d a1 screws 5d `bolts 4d 4d minimum combination minimum combination a2 a2 3d amax=2*5d to be used in equation (2) 3d amax=2*6d to be used in equation (2) 2d 2d not acceptable not acceptable d d 0 0 6d 10d 8d 6d 2d 4d 7d 0 d 2d 3d 5d 4d 0 a1 a1 amax>2*6d if a2 > 4d and a1 > 12d amax>2*6d if a2 > 4d and a1 > 10d 14-15 May 2007 11

  12. Self-tapping screws • high withdrawal and push-in strength Spax Hexagon wood screw Rapid Tecfi Heco 14-15 May 2007 12

  13. tension perpendicular to grain pushing-in example: steel to timber connection withdrawal pushing in withdrawal pushing in pushing in perpendicular grain loading self-tapped connection to steel plate 14-15 May 2007 13

  14. screws (2) LVL - Q top plate hf LVL S- floorbeam h hef R screws (1) 2400 potential notch LVL- Q side beam main beam span 14-15 May 2007 14

  15. F inclination  800 Fwithdrawal [kN] 600 400 200 rods M48 0 0 0,5 1,0 1,5 2,0 2,5 3,0 3,5  [degrees] 14-15 May 2007 15

  16. 14-15 May 2007 15 Thank you for your attention.

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