EUROPEAN STANDARDIZATION AND THE CZECH PRACTICE Petr Kuklk CZECH TECHNICAL UNIVERSITY IN PRAGUE FACULTY OF CIVIL ENGINEERING Horsens, September 2008 EUROPEAN STANDARDIZATION 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 EUROPEAN STANDARDIZATION CIB, RILEM EN standards European standards European standards Eurocodes Eurocodes EUROPEAN STANDARDS STRUCTURAL TIMBER GRADING METHODS Visual grading method Visual grading method Stress grading method Stress grading method 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 INFLUENCE OF THE CRITERIA OF VISUAL GRADING FOR THE CLASSIFICATION OF TIMBER DETERMINATION OF PROPERTIES OF STRUCTURAL TIMBER ACCORDING TO EN 408 EXAMPLE OF TEST RESULTS (SPRUCE) Specimen 12 Knot ratio Annual ring Slope of grain E stat fmfm ,170,8842, , ,221,432, , ,221,5919, , ,262,6527, , ,241,8014, , ,121,0014, , ,301,5143, , ,101,4544, , ,303,7260, , ,253,5359, , ,202,1015, ,88 FACTOR FOR CALCULATION OF CHARACTERISTIC VALUES A-Number of samples B-Number of specimens in the sample VISUAL GRADING OF STRUCTURAL TIMBER ACCORDING TO SN (idt DIN 4074) Strength properties Strength classes Characteristic values (in MPa) Coniferous (spruce, fir, pine, larch) S 13S 10S 7 Bendingf m,k Tensionf t,0,k f t,90,k 0,3 Compressionf c,0,k f c,90,k 5,1 4,6 Shearf v,k 2,52,41,8 Modulus of elasticity E 0,mean E 0, E 90,mean E 90, Shear modulus G mean G Density kk TIMBER QUALITY ACCORDING TO EN 338 GRADING OF STRUCTURAL TIMBER BY PENETRATION METHOD Relationship between the depth of penetration and density Relationship between density and bending strength Relationship between density and modulus of elasticity Relationship between density and modulus of elasticity CONTRIBUTION OF NDT Strength class according to SN (idt DIN 4074) Bending strength according to NAD SN P EN and SN P EN [MPa] Density [kg/m 3 ] Strength calculation [MPa] Strength test [MPa] S ,98340,04 S ,22141,50 S ,28249,37 S ,04050,90 S ,77555,41 S ,39577,22 EUROCODE 5 Timber-concrete composite floors Mller 1922 Mechanically jointed beam Test arrangement for load-slip behaviour with interlayer without interlayer Test of nail in tension Load-slip diagram of dowel type fastener Failure mode of dowel type fastener Determination of the load-carrying capacity 2 hinges concrete timber Determination of the load-carrying capacity 1 hinge Determination of the slip modulus COMPOSITE BEAM Relationship between the arrangement Relationship between the arrangement of cross section and beam stiffness Relationship between the span and beam stiffness THANK YOU FOR YOUR ATTENTION