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A platform for research: civil engineering, architecture and urbanism
The influence of wood density on metal-plate connector mechanical behavior under cyclic loading
Design criteria of wood joints connected with metal plates have been determined by static tests, whereas wind or earthquakes produce dynamic loads on structures. Allowable stresses are deduced from these tests, hence stress reduction coefficients are often inadequate for predicting joint life and safety design loads. Furthermore, many factors influence wood joint performance, such as wood density and mechanical properties, grain angle, connector orientation and its features, etc. This study dealt with the influence of wood density on static and fatigue properties of such joints. Static and cyclic loading and tensile tests were carried out on joints assembled at a 90-degree angle and connected with metal plates for two categories of density ranging from 0.34 to 0.38 and from 0.45 to 0.56 (12 % moisture content) of Norway spruce (Picea abies Karst.). High-density wood joints were not much more rigid but could bear an average of 30 percent greater load than low-density joints. Apart from the initial imposed load level, wood density did not influence mechanical behaviour of this type of joint. The results do not allow an accurate estimation of joint life. Nevertheless, the endurance limit can be relatively easy to estimate and lies at about 40 percent of ultimate static tensile strength corrected by individual densities. The first sheared teeth occured by 2100 cycles. Beyond that threshold, shearing of teeth is the main parameter determining joint life.
The influence of wood density on metal-plate connector mechanical behavior under cyclic loading
Design criteria of wood joints connected with metal plates have been determined by static tests, whereas wind or earthquakes produce dynamic loads on structures. Allowable stresses are deduced from these tests, hence stress reduction coefficients are often inadequate for predicting joint life and safety design loads. Furthermore, many factors influence wood joint performance, such as wood density and mechanical properties, grain angle, connector orientation and its features, etc. This study dealt with the influence of wood density on static and fatigue properties of such joints. Static and cyclic loading and tensile tests were carried out on joints assembled at a 90-degree angle and connected with metal plates for two categories of density ranging from 0.34 to 0.38 and from 0.45 to 0.56 (12 % moisture content) of Norway spruce (Picea abies Karst.). High-density wood joints were not much more rigid but could bear an average of 30 percent greater load than low-density joints. Apart from the initial imposed load level, wood density did not influence mechanical behaviour of this type of joint. The results do not allow an accurate estimation of joint life. Nevertheless, the endurance limit can be relatively easy to estimate and lies at about 40 percent of ultimate static tensile strength corrected by individual densities. The first sheared teeth occured by 2100 cycles. Beyond that threshold, shearing of teeth is the main parameter determining joint life.
The influence of wood density on metal-plate connector mechanical behavior under cyclic loading
Der Einfluß der Holzdichte auf das mechanische Verhalten von Nagelplattenverbindungen unter Wechsellast
Jorfe Daniel De Melo Moura (author) / Bastian, C. (author) / Duchanois, G. (author) / Leban, J.M. (author) / Triboulot, P. (author)
Forest Products Journal ; 45 ; 74-82
1995
9 Seiten, 13 Bilder, 3 Tabellen, 26 Quellen
Article (Journal)
English
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