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

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Presentation transcript:

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

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

Stress Strain Relation According to Glos (1978)

Stress Strain Relation According to Glos (1978)

Stress Strain Relation According to Glos (1978) Conditions:

Stress Strain Relation According to Glos (1978) Conditions:

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

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

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

Serviceability

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

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

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

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

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

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

GLULAM Standard deviations?

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

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

Connections Probabilistic Framework: Johansen equations

Connections Probabilistic Framework: Johansen equations

Connections Probabilistic Framework: “Splitting Mode parallel”

Connections Mixed Mode Fracture Energy

Connections Probabilistic Framework: “Splitting Mode perpendicular”

Connections Probabilistic Framework: Effective number of fasteners

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

Quantification of Model Parameters

Actions: Collecting Data for a Data Base Coordination:

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??