TY - JOUR
T1 - Model for the prediction of the tensile strength and tensile stiffness of knot clusters within structural timber
AU - Fink, Gerhard
AU - Kohler, Jochen
PY - 2014
Y1 - 2014
N2 - In the present paper, a model for the prediction of the local strength and stiffness properties is developed. Compared to existing models, here the local material properties are described according to their morphological characteristics; i.e. the timber boards are subdivided into sections containing knots (knot sections) and sections without knots (clear wood sections). The strains of the corresponding sections are measured during non-destructive tensile tests using an optical camera device. Based on these measurements the tensile stiffness of each particular section is estimated. For the estimation of the tensile strength, destructive tensile tests are performed. Herewith, the tensile strength of the entire timber board is measured. The strength of the other knot clusters are estimated using censored regression analysis. Taking into account the results of the experimental investigation, material models are developed to predict the tensile strength and the tensile stiffness of knot clusters.
AB - In the present paper, a model for the prediction of the local strength and stiffness properties is developed. Compared to existing models, here the local material properties are described according to their morphological characteristics; i.e. the timber boards are subdivided into sections containing knots (knot sections) and sections without knots (clear wood sections). The strains of the corresponding sections are measured during non-destructive tensile tests using an optical camera device. Based on these measurements the tensile stiffness of each particular section is estimated. For the estimation of the tensile strength, destructive tensile tests are performed. Herewith, the tensile strength of the entire timber board is measured. The strength of the other knot clusters are estimated using censored regression analysis. Taking into account the results of the experimental investigation, material models are developed to predict the tensile strength and the tensile stiffness of knot clusters.
UR - http://www.scopus.com/inward/record.url?scp=84899655249&partnerID=8YFLogxK
U2 - 10.1007/s00107-014-0781-0
DO - 10.1007/s00107-014-0781-0
M3 - Article
AN - SCOPUS:84899655249
VL - 72
SP - 331
EP - 341
JO - European Journal of Wood and Wood Products
JF - European Journal of Wood and Wood Products
SN - 0018-3768
IS - 3
ER -