1. Taskforce Meeting Zurich 6./7.09.2004 Summary and Progress Jochen Köhler, ETH Zurich, Switzerland

2. Contents Stress Strain Relation Serviceability DOL GLULAM Connections Quantification of model parameters

3. Stress Strain Relation According to Glos (1978)

4. Stress Strain Relation According to Glos (1978)

5. Stress Strain Relation According to Glos (1978) Conditions:

6. Stress Strain Relation According to Glos (1978) Conditions:

7. According to Glos (1978) Discussion: MOE in tension = MOE compression ? Quantification of asymptotic compression strength and strain. Modelling of N ? Typical values: Stress Strain Relation

8. Actions: Quantify asymptotic stress Include into the Model Code Coordination: Jochen Köhler

9. Serviceability According to Torratti (1992): The following conditions apply –The deformations are calculated in the grain direction only –The maximum stress bending stress is 20 Mpa –Natural conditions environment conditions apply (temperature and humidity) –The model has been successfully compared to tests on European softwoods, both solid wood and glulam of different sizes

10. Serviceability

11. Actions: Producing a matrix for different load and climate situations. Therefore the following is needed: –quantify moisture loads (Lars-Oluf Nielsson (Lund)/study from DTU 2003) –quantify load sequences –acquiring data, quantify model parameters –doing calculations and sensitivity analysis Coordination:Tomi Toratti

12. DOL Limit state function: Model (Nielsen): Applied stress: combined with climate deviations

13. DOL Limit state function: Model (Barrett): Applied stress: combined with climate deviations

14. DOL Gaps: DOL - Tension perpendicular to the grain DOL - Connections

15. DOL Actions: Acquire North American data Review data, quantify model parameters Distribute tasks according ‘Tension perpendicular to the grain’ and ‘Connections’ Coordination:John D. Sorensen

16. GLULAM Glued laminated timber in BENDING Load carring capacity depending on the outermost lamination Lamination = timber boards with length a; jointed by finger joints a is assumed to be Poisson distributed The tensile strength and stiffness of each board is assumed to be constant and lognormal distributed. The strength of the finger joints is assumed to be lognormal distributed

17. GLULAM Standard deviations?

18. GLULAM Actions: Proposal of a simple model Test data acquisition Coordination: Hans-J. Larsen

19. Connections Probabilistic Framework: Johansen equations “Splitting Mode parallel” “Splitting Mode perpendicular”

20. Connections Probabilistic Framework: Johansen equations

21. Connections Probabilistic Framework: Johansen equations

22. Connections Probabilistic Framework: “Splitting Mode parallel”

23. Connections Mixed Mode Fracture Energy

24. Connections Probabilistic Framework: “Splitting Mode perpendicular”

25. Connections Probabilistic Framework: Effective number of fasteners

26. Connections Actions: Acquire test data Case study – reliability analysis Coordination: André Jorissen

27. Quantification of Model Parameters

28. Actions: Collecting Data for a Data Base Coordination:

29. Summary Topic:Coordination: Stress Strain Relation, Basic Material Properties - Tension Perpendicular - Grading Jochen Köhler ?? ServiceabilityTomi Toratti GLULAMHans-J. Larsen DOL - Connections John Sorensen ?? ConnectionsAndré Jorissen Data Base?? Moisture??