Numerical simulation of framed joints in sawn-timber roof trusses

This paper presents an analysis of carpentry joints between structural timber members based on numerical simulation. In conventional design, simplifying assumptions of the stress distribution and the transmission of forces on the contacting surfaces are made, and the effect of contact friction between surfaces is neglected. Whereas a number of authors have been concerned with other types of joints, such as mechanical or glued joints between timber members, carpentry joints have hardly been subject to numerical simulations. This study presents a more realistic approach to the behaviour of these joints, using the finite element method, which enables further knowledge of the stresses acting on the joint. In addition, the finite element method enables the optimization of the geometric definition of carpentry joints between structural timber members. The numerical simulations performed for framed joints have revealed that friction between contacting surfaces has particular relevance for the behaviour of the joint. The Spanish Technical Building Code, among others, is based on conventional design. Numerical simulations have revealed a high level of safety in such a conventional definition of framed joints.

[1]  M. Piazza,et al.  Seismic behavior and retrofitting of joints in traditional timber roof structures , 2002 .

[2]  K. J. Fridley,et al.  Failure modeling of sawn lumber with a fastener hole , 2000 .

[3]  R. Hussein.  Parametric investigation of the buckling performance of metal-plate-connected joints , 2000 .

[4]  D M Moses,et al.  A three-dimensional model for bolted connections in wood , 2003 .

[5]  Rakesh Gupta,et al.  Destructive testing of metal-plate-connected wood truss joints. , 1990 .

[6]  Peter Ellegaard.  Finite-Element Modeling of Timber Joints with Punched Metal Plate Fasteners , 2006 .

[7]  Rakesh Gupta,et al.  Modeling of metal-plate-connected wood truss joints: Part II - application to overall truss model , 1997 .

[8]  Edward Lusambo,et al.  SE—Structures and Environment: The Strength of Wire-connected Round Timber Joints , 2002 .

[9]  Dong-Sheng Jeng,et al.  Finite element modeling for the mechanical behavior of dowel-type timber joints , 2003 .

[10]  Ghyslaine McClure,et al.  Elasto-plastic modeling of wood bolted connections , 2003 .

[11]  K. G. Gebremedhin,et al.  Resistance distributions of a metal-plate-connected wood truss , 1992 .

[12]  Rakesh Gupta,et al.  ANALYSIS OF METAL-PLATE-CONNECTED WOOD TRUSSES WITH SEMI-RIGID JOINTS , 1992 .

[13]  Manuel J. Freire-Tellado,et al.  Estructuras de madera , 1991 .

[14]  Ramón Argüelles Álvarez,et al.  Estructuras de madera: diseño y cálculo , 1996 .

[15]  Rüdiger Dillmann,et al.  Computer-Aided Design and Manufacturing , 1986, Symbolic Computation.

[16]  Rakesh Gupta,et al.  MODELING OF METAL-PLATE-CONNECTED WOOD TRUSS JOINTS , 1996 .

[17]  Lars Stehn,et al.  The influence of nail ductility on the load capacity of a glulam truss structure , 2004 .

[18]  Francisco Ayuga,et al.  Analysis of dynamic discharge pressures in cylindrical slender silos with a flat bottom or with a hopper: comparison with Eurocode 1 , 2005 .

[19]  J. C. Simo,et al.  An augmented lagrangian treatment of contact problems involving friction , 1992 .

[20]  Kei Sawata,et al.  Estimation of yield and ultimate strengths of bolted timber joints by nonlinear analysis and yield theory , 2003, Journal of Wood Science.