The Influence of Improved Strength Grading In Situ on Modelling Timber Strength Properties

  • The management and preservation of structures in our built environment are central and challenging tasks for practicing engineers. Within the CEN member states (European Committee for Standardization), the so-called Eurocodes form the basis of the design and verification of the load-bearing capacity of structures. Current Eurocodes do not contain special recommendations for existing structures, meaning that the principles for new structures are applied. This can lead to an incorrect estimation of the load-bearing capacity within the semi-probabilistic safety concept. A central task within the investigation and evaluation of existing structures is the strength grading of the material in situ using non-/semi-destructive technical devices. Studies show the potential of the ultrasonic time-of-flight measurement in combination with visual evaluation for an improved grading. The information on the material from an improved grading technique can be used to update the material parameters as a target variable using a measured referenceThe management and preservation of structures in our built environment are central and challenging tasks for practicing engineers. Within the CEN member states (European Committee for Standardization), the so-called Eurocodes form the basis of the design and verification of the load-bearing capacity of structures. Current Eurocodes do not contain special recommendations for existing structures, meaning that the principles for new structures are applied. This can lead to an incorrect estimation of the load-bearing capacity within the semi-probabilistic safety concept. A central task within the investigation and evaluation of existing structures is the strength grading of the material in situ using non-/semi-destructive technical devices. Studies show the potential of the ultrasonic time-of-flight measurement in combination with visual evaluation for an improved grading. The information on the material from an improved grading technique can be used to update the material parameters as a target variable using a measured reference variable. In this contribution, test data from a partner project (spruce, pine, and oak) are analyzed, applying the stochastic grading model of Pöhlmann and Rackwitz. It can be shown that different grading techniques influence the updated distribution function of the material strength within the grade. The results depend on the timber species. Perspectives to develop updated models dependent on the knowledge available are shown and discussed.show moreshow less

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Metadaten
Author:Maria LoebijinskiORCiD, Wolfgang Rug, Hartmut Pasternak
URN:urn:nbn:de:kobv:eb1-opus-2357
DOI:https://doi.org/10.3390/buildings10020030
ISSN:2075-5309
Parent Title (English):Buildings
Publisher:MDPI
Document Type:Article
Language:English
Year of Completion:2020
Date of Publication (online):2022/05/24
Date of first Publication:2020/02/18
Publishing Institution:Hochschule für nachhaltige Entwicklung Eberswalde
Release Date:2022/05/24
Tag:code calibration; evaluation procedure; existing structures; modelling material properties; timber
Volume:10
Issue:2
Article Number:30
Page Number:15
Institutions / Departments:Fachbereich Holzingenieurwesen
Dewey Decimal Classification:5 Naturwissenschaften und Mathematik / 53 Physik / 531 Klassische Mechanik; Festkörpermechanik
open_access (DINI-Set):open_access
University Bibliography:University Bibliography
Zweitveröffentlichung
Peer-Review / Referiert
Licence (German):License LogoCreative Commons - CC BY - Namensnennung 4.0 International
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