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The purpose of the study is to model and experimentally verify factors influencing changes in the instantaneous, medium-term and long-term stiffness of nail plate joints, sawn timber and nail plate trusses. The instantaneous stiffness of the nail plate truss is modelled with the aid of nail plate joint and sawn timber models, the contributions of these components to the overall truss deformation being weighted by the magnitude of their effects. A new joint model is proposed for the nail plate joint and the instantaneous stiffness of sawn timber is modelled by also taking account of the change occurring in the cross-sectional shape as the moisture content of the wood changes. In addition to the constant humidity creep models described in the literature, new mechanosorptive creep models describing joint creep in both constant and variable humidity conditions are presented for the nail plate joint. The sawn timber creep models are experimental power functions in the case of constant humidity and mechanosorptive creep models in the case of variable humidity. The contribution of the joints to the creep of the trusses is emphasized and the presented creep model for the truss in variable humidity is formulated from the joint creep model. An easy-to-use power function is presented for estimating the creep of deflection caused by the medium-term loading of trusses.
The purpose of the study is to model and experimentally verify factors influencing changes in the instantaneous, medium-term and long-term stiffness of nail plate joints, sawn timber and nail plate trusses. The instantaneous stiffness of the nail plate truss is modelled with the aid of nail plate joint and sawn timber models, the contributions of these components to the overall truss deformation being weighted by the magnitude of their effects. A new joint model is proposed for the nail plate joint and the instantaneous stiffness of sawn timber is modelled by also taking account of the change occurring in the cross-sectional shape as the moisture content of the wood changes. In addition to the constant humidity creep models described in the literature, new mechanosorptive creep models describing joint creep in both constant and variable humidity conditions are presented for the nail plate joint. The sawn timber creep models are experimental power functions in the case of constant humidity and mechanosorptive creep models in the case of variable humidity. The contribution of the joints to the creep of the trusses is emphasized and the presented creep model for the truss in variable humidity is formulated from the joint creep model. An easy-to-use power function is presented for estimating the creep of deflection caused by the medium-term loading of trusses.
Stiffness Changes in Nail Plate Trusses
M. Leivo (author)
1991
237 pages
Report
No indication
English
Construction Materials, Components, & Equipment , Construction Equipment, Materials, & Supplies , Wood & Paper Products , Stiffness , Structural timber , Trusses , Structural members , Nails(Fasteners) , Mechanical properties , Joints(Junctions) , Deflection , Gusset plates , Timber construction , Creep properties , Foreign technology
On the stiffness changes in nail plate trusses
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