The review starts by identifying the conditions for taking account of the semi‐rigid behaviour of joints with dowel‐type fasteners, i.e. well‐defined load–displacement behaviour, no initial slip and reliable ductility. It is described how reinforcing a wood member perpendicular to the grain with fibre fabrics, plywood or densified veneer wood ensures that joints have reliable ductile behaviour. New types of fastener with desirable properties are described; with the expanded tube fastener being especially interesting. Modelling the load–displacement curves for single fasteners and joints with multiple fasteners is discussed. The so‐called Plane Group of Mechanical Fasteners Model is most appropriate. The Spring Model is less suited to timber than steel. Some examples show how the semi‐rigidity in the joints influences the behaviour of structural systems. The conclusions are that taking semi‐rigidity of joints into account can lead to more efficient and economical structures.
Splitting failure in beam splice joints with gluedin rods parallel to grain in endwood subjected to pure shear is considered. A simple theoretical expression based on beam-on-elastic-foundation theory and quasi-non-linear fracture mechanics is presented for calculation of the joint strength. Tests were conducted on jointed beams in a fourpoint bending test setup in which the joints were located at the point of pure shear force. Hardwood dowels with a diameter of 12 mm and a glued-in length of 120 mm were used as rods, and various beam cross sections and dowel configurations were tested. The theory presented is found to agree well with test results in all cases in which the edge distance of the glued-in rods is relatively small. Some test results indicate that the theory may be conservative in case of large edge distances.
Key wordsShear strength • Splice joint • Glued-in rods • Quasi-non-linear fracture mechanics • Beam-on-elasticfoundation Joints in beams with cross-sectional dimensions of 100 ϫ 200 mm, 50 ϫ 300 mm, and 120 ϫ 420 mm and various dowel configurations were tested in pure shear.
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