1. EUROPEAN STANDARDIZATION AND THE CZECH PRACTICE Petr Kuklík CZECH TECHNICAL UNIVERSITY IN PRAGUE FACULTY OF CIVIL ENGINEERING Horsens, September 2008

2. EUROPEAN STANDARDIZATION

3. EUROPEAN TECHNICAL COMMITTEES more than 100 EN! TC 38 Durability of wood and wood-based products TC 112 Wood-based panels TC 124 Timber structures TC 175 Round and sawn timber TC 193 Adhesives TC 250/SC 5 Structural Eurocodes/Timber structures

4. EUROPEAN STANDARDIZATION CIB, RILEM → EN standards European standards European standards Eurocodes Eurocodes

5. EUROPEAN STANDARDS

6. STRUCTURAL TIMBER GRADING METHODS Visual grading method Visual grading method Stress grading method Stress grading method

7. STRUCTURAL TIMBER NDT - GRADING METHODS Penetration method Penetration method Stress wave method Stress wave method Ultrasound method Ultrasound method Impact sounding method Impact sounding method

8. INFLUENCE OF THE CRITERIA OF VISUAL GRADING FOR THE CLASSIFICATION OF TIMBER

9. DETERMINATION OF PROPERTIES OF STRUCTURAL TIMBER ACCORDING TO EN 408

10. EXAMPLE OF TEST RESULTS (SPRUCE) Specimenρ 12 Knot ratio Annual ring Slope of grain E stat fmfm 115370,170,8842,018 19777,22 124370,221,432,011 37555,85 134490,221,5919,013 22551,93 144410,262,6527,011 65047,04 154500,241,8014,014 03739,54 165540,121,0014,016 18475,81 175410,301,5143,017 24461,68 185390,101,4544,014 19569,79 194060,303,7260,06 71824,33 204730,253,5359,08 67527,32 214790,202,1015,014 57750,88

11. FACTOR FOR CALCULATION OF CHARACTERISTIC VALUES A-Number of samples B-Number of specimens in the sample

12. VISUAL GRADING OF STRUCTURAL TIMBER ACCORDING TO ČSN 73 2824-1 (idt DIN 4074) Strength properties Strength classes Characteristic values (in MPa) Coniferous (spruce, fir, pine, larch) S 13S 10S 7 Bendingf m,k 272216 Tensionf t,0,k 161310 f t,90,k 0,3 Compressionf c,0,k 222017 f c,90,k 5,1 4,6 Shearf v,k 2,52,41,8 Modulus of elasticity E 0,mean 12 00010 0008 000 E 0,05 8 0006 7005 400 E 90,mean 400330270 E 90,05 270220180 Shear modulus G mean 750630500 G 05 500420330 Density kk 380370350

13. TIMBER QUALITY ACCORDING TO EN 338

14. GRADING OF STRUCTURAL TIMBER BY PENETRATION METHOD

15. Relationship between the depth of penetration and density

16. Relationship between density and bending strength

17. Relationship between density and modulus of elasticity Relationship between density and modulus of elasticity

18. CONTRIBUTION OF NDT Strength class according to ČSN 73 2824-1 (idt DIN 4074) Bending strength according to NAD ČSN P EN 1995-1-1 and ČSN P EN 1995-2 [MPa] Density [kg/m 3 ] Strength calculation [MPa] Strength test [MPa] S 102246033,98340,04 S 102240234,22141,50 S 132743731,28249,37 S 102249244,04050,90 S 132740939,77555,41 S 132753761,39577,22

19. EUROCODE 5 Timber-concrete composite floors Müller 1922

20. Mechanically jointed beam

21. Test arrangement for load-slip behaviour with interlayer without interlayer

22. Test of nail in tension

23. Load-slip diagram of dowel type fastener

24. Failure mode of dowel type fastener

25. Determination of the load-carrying capacity 2 hinges concrete timber

26. Determination of the load-carrying capacity 1 hinge

28. Determination of the slip modulus

29. COMPOSITE BEAM

30. Relationship between the arrangement Relationship between the arrangement of cross section and beam stiffness

31. Relationship between the span and beam stiffness

32. THANK YOU FOR YOUR ATTENTION