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WG 1 Discussion

This publication discusses the analysis of failures on timber structures in Germany and Nordic countries, as well as providing guidelines for maintenance and failure assessment. Topics include assessing and repairing cracks in glulam structures, ensuring stability of slender structures, communication from design to construction site, and identifying durability failures.

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WG 1 Discussion

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  1. WG 1Discussion • Planning of Cost Publication: Table of content established(Further publications: journal articles, WCTE2006, CEN standard) • Discussion on the presented topics Cost E55 14.05.2007

  2. Table of content • Introduction • Matthias Frese, Analysis of failures on timber structures in Germany • Eva Frühwald, Analysis of failures on timber structures based on a Nordic project • Heinrich Kreuzinger, Guidelines on maintenance and failure assessment • Tomi Toratti, Guidelines for quality in the timber building process6. Discussion Cost E55 14.05.2007

  3. What are the Systems or Components leading to failures or malfunctions? Further discussion topics related to learning from failures: - Cracks in glulam structures: how do we assess them? How do we repair them? - Special teaching and training efforts for designers on stability of slender structures. - How do we ensure a good communication from design to the construction site? - Durability failures - are we missing them? - Any needs for further joint European activities on the topics presented. WG 1 Cost E55 14.05.2007

  4. What are the Systems or Components leading to failures or malfunctions? Failure mechanisms may be different in different countries Different building culture Quality control level of design and construction Who does the failure assessment, is the info available WG 1 Cost E55 14.05.2007

  5. What are the Systems or Components leading to failures or malfunctions? Failure modes A. Loss of stability B. Connections and cracks C. Floor vibrations Reasons for the failures 1. Designer error 2. Lack of design (no engineering)3. Construction error (design not followed) No evidence on malfunctions related to design method or safety level of design codeor material quality (except a few) WG 1 Cost E55 14.05.2007

  6. What are the Systems or Components leading to failures or malfunctions? • Loss of stability: Related to roof trussesScenarios:- Roof truss drawings (from the manufacturer) are not followed on the site: a problem in the building prosess - Alterations are carried out without engineering Cost E55 14.05.2007

  7. What are the Systems or Components leading to failures or malfunctions? • B. Connections and cracks- Design needs expertise- perpendicular to grain stresses- Wood dries in service Connection design should consider the drying of woodorwood has to be very dry when installed Cost E55 14.05.2007

  8. Cost E55 14.05.2007

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