Radiusholz Curved Cross Laminated Timber (CLT) Elements 25.06.2014 Picture reference: www.radiusholz.at G. Stecher, A. Kraler, R. Maderebner
PROJECT RADIUSHOLZ Idea: Automated production of curved CLT-elements First feasibility study (2008) Determination of the stiffnes and the strength parameters Effects of tension perpendicular to the grain - to the bending- and rolling shear stress Laboratory experiments G. Stecher, A. Kraler, R. Maderebner Z Y X 2
LABORATORY EXPERIMENTS ACCORDING TO pren 16351 Bending tests with loads perpendicular to the plane Shear tests with loads perpendicular to the plane Bending test with loads in plane direction Shear test with loads in plane direction G. Stecher, A. Kraler, R. Maderebner 3
SAMPLE GROUP type description quantity number of layers layer thickness radius [-] [-] [-] [mm] [m] 1 panel - bending 18 5 19 4,5 2 panel - bending 18 9 19 4,5 3 panel - thrust 18 5 32 6,5 4 panel - thrust 18 9 19 4,5 5 plate - bending 18 5 19 6 plate - bending 18 9 19 7 plate - thrust 18 5 32 8 plate - thrust 18 9 19 G. Stecher, A. Kraler, R. Maderebner 4
TESTING SETUP SUPPORT GEOMETRY support geometry - cut support support geometry steel plate support geometry - chock G. Stecher, A. Kraler, R. Maderebner 5
NUMERICAL CALCULATION MODEL Z Y X Normalspannungen σ x [N/mm 2 ] 40.0 32.7 25.5 18.2 10.9 3.6-3.6-10.9-18.2-25.5-32.7-40.0 Max : 34.6 Min : -67.0 normal stress in local x-direction (bending stress); σ m,x,σ c,0, σ t,0 normal stress in local y-direction (transverse stress); σ c,90,σ t,90 shear stress xz G. Stecher, A. Kraler, R. Maderebner 6
Bending test with loads perpendicular to the plane according to pren 16351 G. Stecher, A. Kraler, R. Maderebner 7
Bending test with loads perpendicular to the plane according to pren 16351 Type 2 G. Stecher, A. Kraler, R. Maderebner 8
Bending test with loads perpendicular to the plane according to pren 16351 Type 2 Transverse tensile deformation Global modulus of elasticity in bending Local modulus of elasticity in bending G. Stecher, A. Kraler, R. Maderebner 9
Bending test with loads perpendicular to the plane according to pren 16351 Type 2 G. Stecher, A. Kraler, R. Maderebner 10
Bending test with loads perpendicular to the plane according to pren 16351 Type 1 G. Stecher, A. Kraler, R. Maderebner 11
Bending test with loads perpendicular to the plane according to pren 16351 Type 1 G. Stecher, A. Kraler, R. Maderebner 12
Shear test with loads perpendicular to the plane according to pren 16351 G. Stecher, A. Kraler, R. Maderebner 13
Shear test with loads perpendicular to the plane according to pren 16351 Type 3 G. Stecher, A. Kraler, R. Maderebner 14
Shear test with loads perpendicular to the plane according to pren 16351 Type 3 G. Stecher, A. Kraler, R. Maderebner 15
Shear test with loads perpendicular to the plane according to pren 16351 Type 4 G. Stecher, A. Kraler, R. Maderebner 16
Shear test with loads perpendicular to the plane according to pren 16351 Type 4 G. Stecher, A. Kraler, R. Maderebner 17
Bending test with loads in plane direction according to pren 16351 G. Stecher, A. Kraler, R. Maderebner 18
Bending test with loads in plane direction according to pren 16351 Type 5 Type 6 G. Stecher, A. Kraler, R. Maderebner 19
Shear test with loads in plane direction according to pren 16351 G. Stecher, A. Kraler, R. Maderebner 20
Shear test with loads in plane direction according to pren 16351 Type 7 Type 8 G. Stecher, A. Kraler, R. Maderebner 21
SUMMARY 72 curved cross laminated timber specimens 72 straight cross laminated timber specimens bending stiffness and shear stiffness bending strength and shear strength transverse tensile deformations interaction of bending stresses as well as rolling shear stresses with transverse stresses G. Stecher, A. Kraler, R. Maderebner 22
Thank you for your attention G. Stecher, A. Kraler, R. Maderebner 23