Glued-in rods – Application and design rules
University of Zagreb (Croatia)
1) Glued-in rods (GiR) are an effective way of producing stiff, high-capacity connections in timber structures. GiR are used for column foundations, moment-resisting connections in beams and frame corners, as shear connectors and for strengthening structural elements when extensively loaded perpendicular to grain and in shear. Also, GiR represent very interesting solution of connecting elements regarding to aesthetic appearance. There are plenty of new structures executed with GiR (bridges, trusses, special structures) and lot of old structures is strengthened with this technique. One invited speaker (engineer or academic) can explain benefits of GiR and show it on real structures.
2) Over the past 25 years, despite many national research projects, European projects, COST Actions (e.g. E13, E34) and constant practical application of GiR there is still no universal standard for the design thereof. Although there are numerous studies and calculation methods, and although in an earlier version of EN 1995 design methods exists, the basic problem is still which method to accept and to implement in EN 1995. It is clear that a lack of a common European design approach is a serious obstacle to the exploitation of the GiR connection. In the CEN/TC 250/SC5 work programme (“towards a 2nd generation of EN Eurocodes”), glued-in rods are pointed out as an important work item. One speaker can explain problems with design rules regarding to different approaches to the problem and history of recommended design rules.
3) In multiple rod connections non-uniform distribution of forces and interference between the rods occur. In present design recommendations there is a lack of guidelines for such problem. For multiple rod connections the spacing between the rods and the edge distances are key issues and new recommendations should be done. One speaker can explain differences between applications with one GiR and multiple GiR and show it on examples (or real structures).
4) Reinforcement of structural elements with GiR is known for decades. Notched beams or beams with holes, curved or tapered beams and contact zones, supports with high compression stresses perpendicular to the grain can be shown and explained.
5) Use of new materials such as FRP rods, new adhesives and new wood based products (LVL). One speaker can explain problems and advantages with implementation of new materials in such applications with overview on technical approvals and problems of implementation in the codes.
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