Events calendar
RILEM International Symposium on Materials and Joints in Timber Structures - Recent advancement of technology
Please note that the deadline for abstracts has been changed. The organizers have decided to accept abstracts until the 13th of January 2013 (ultimate deadline).
Advancement in timber structures which represent discrete elements connected either rigidly, i. e. glued or semi rigidly (mechanically) is based on both, improved new materials and innovative jointing technology.
Regarding materials, it is certainly the spacious plate-material cross-lam, manufactured up to slab sizes(thickness, width and length) of 0.4 m x 4 m x 30 m, which has opened new perspectives for timber constructions. As openings, such as windows and doors, can be easily cut into the monolithic elements, rapid, dry and highly prefabricated building has reached a new level of technology. Cross-lam already enabled wooden multi-storey buildings up to 10 storeys and positive feasibility studies have opened the horizon for 30 storey buildings. However the re-invention of plywood on the basis of boards is still not finished. There are many further options, one of them being the vertical use of cross-lam for beams where high shear and tension perpendicular to grain capacity is mandatory.
Another as well promising and necessary wood material option consists in the use of hard woods for engineered wood products which has gained considerable momentum. Now, the first industrial productions of oak and chestnut glulam beams as well as beech LVL have entered the market.
Regarding durability, being one of the very crucial issues of the material wood in all but indoor uses, true advancements of technology in wood modification have to be acknowledged. The first heavy traffic bridges built of extremely durable acetylated wooden beams manifest undeniable progress. There are other examples, for instance thermo-wood, where developments are no more confined to small-scale laboratory production.
A further renewable wood-like material, namely bamboo, is considerably extending the possibilities and efficiency of wooden materials. Processed and densified bamboo strands enable the production of plates and beams of strength properties similar and higher as steel. Low density wood fiber boards, representing a highly ecological insulation material are now simultaneously used for structural bracing purposes, too.
Regarding mechanical joints, self-tapping screws produced up to lengths of 1.5 m have changed jointing and reinforcement technology considerably. Employing the screw primarily as a tension transferring device at an angle to fiber direction overcomes deficiencies of dowel type fasteners which act by embedment and hereby inherently induce splitting due to tension perpendicular to grain. Self tapping screws used in combination with special dove-tailed metal plates enable architecturally esteemed, completely hidden end-grain connections.
In case of glued joints, now approved and reliable adhesive systems have entered into timber construction technology and enable new jointing solutions for instance for wide-span grid-like spherical domes. Glued-in perforated steel plates lead to stiff and strong timber-concrete compound structures. Recently a new glued jointing technology for glulam beams which enables the transfer of forces without any reduction of the full cross-sectional capacity has been developed.
The symposium aims to compile the latest knowledge on novelties in wooden materials and jointing technology including relevant calculation and design models. All fields relevant for structural engineering shall be considered. Apart from strength, stiffness and fire issues, special consideration shall be given to construction and connection solutions for favorable seismic behavior. Further durability and environmental issues are of interest.
The local organizers and editors will be Simon Aicher, Hans W. Reinhardt and Harald Garrecht, all from University of Stuttgart.
Previous conference in this series: Joints in Timber Structures, Stuttgart 2001 (see RILEM PRO 22)
Important dates for prospective authors:
Send out of Conference flyer: 09 October 2012
Deadline for abstracts: 13.01.2013
Notifications of paper acceptance: to the end of January
Deadline for papers: 01.05.2013
Important dates of registration:
Early bird registration (reduced fee): 15.07.2013
Latest registration: 01.08.2012
Advancement in timber structures which represent discrete elements connected either rigidly, i. e. glued or semi rigidly (mechanically) is based on both, improved new materials and innovative jointing technology.
Regarding materials, it is certainly the spacious plate-material cross-lam, manufactured up to slab sizes(thickness, width and length) of 0.4 m x 4 m x 30 m, which has opened new perspectives for timber constructions. As openings, such as windows and doors, can be easily cut into the monolithic elements, rapid, dry and highly prefabricated building has reached a new level of technology. Cross-lam already enabled wooden multi-storey buildings up to 10 storeys and positive feasibility studies have opened the horizon for 30 storey buildings. However the re-invention of plywood on the basis of boards is still not finished. There are many further options, one of them being the vertical use of cross-lam for beams where high shear and tension perpendicular to grain capacity is mandatory.
Another as well promising and necessary wood material option consists in the use of hard woods for engineered wood products which has gained considerable momentum. Now, the first industrial productions of oak and chestnut glulam beams as well as beech LVL have entered the market.
Regarding durability, being one of the very crucial issues of the material wood in all but indoor uses, true advancements of technology in wood modification have to be acknowledged. The first heavy traffic bridges built of extremely durable acetylated wooden beams manifest undeniable progress. There are other examples, for instance thermo-wood, where developments are no more confined to small-scale laboratory production.
A further renewable wood-like material, namely bamboo, is considerably extending the possibilities and efficiency of wooden materials. Processed and densified bamboo strands enable the production of plates and beams of strength properties similar and higher as steel. Low density wood fiber boards, representing a highly ecological insulation material are now simultaneously used for structural bracing purposes, too.
Regarding mechanical joints, self-tapping screws produced up to lengths of 1.5 m have changed jointing and reinforcement technology considerably. Employing the screw primarily as a tension transferring device at an angle to fiber direction overcomes deficiencies of dowel type fasteners which act by embedment and hereby inherently induce splitting due to tension perpendicular to grain. Self tapping screws used in combination with special dove-tailed metal plates enable architecturally esteemed, completely hidden end-grain connections.
In case of glued joints, now approved and reliable adhesive systems have entered into timber construction technology and enable new jointing solutions for instance for wide-span grid-like spherical domes. Glued-in perforated steel plates lead to stiff and strong timber-concrete compound structures. Recently a new glued jointing technology for glulam beams which enables the transfer of forces without any reduction of the full cross-sectional capacity has been developed.
The symposium aims to compile the latest knowledge on novelties in wooden materials and jointing technology including relevant calculation and design models. All fields relevant for structural engineering shall be considered. Apart from strength, stiffness and fire issues, special consideration shall be given to construction and connection solutions for favorable seismic behavior. Further durability and environmental issues are of interest.
The local organizers and editors will be Simon Aicher, Hans W. Reinhardt and Harald Garrecht, all from University of Stuttgart.
Previous conference in this series: Joints in Timber Structures, Stuttgart 2001 (see RILEM PRO 22)
Important dates for prospective authors:
Send out of Conference flyer: 09 October 2012
Deadline for abstracts: 13.01.2013
Notifications of paper acceptance: to the end of January
Deadline for papers: 01.05.2013
Important dates of registration:
Early bird registration (reduced fee): 15.07.2013
Latest registration: 01.08.2012
See all events
from Tuesday 8 October
to Thursday 10 October 2013
Stuttgart, Germany
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Stuttgart, Germany
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