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Advancements in Timber Structures' Performance Modeling and Fasteners Analysis

Explore the performance and vulnerability of timber structures focusing on fastener types such as dowels and screws. Analyze models like European Yield Model (EYM) to understand failure mechanisms. Learn about the impact of loading directions and fastener configurations.

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Advancements in Timber Structures' Performance Modeling and Fasteners Analysis

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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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