EUROPEAN STANDARDIZATION AND THE CZECH PRACTICE Petr Kuklík 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) Specimenρ 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 ČSN (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 kk

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 ČSN (idt DIN 4074) Bending strength according to NAD ČSN P EN and ČSN 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 Müller 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

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