Low cost Glulam Portals have been successful in achieving a total saving of up to 13% in comparison to standard steel frame structures, when compared to the. Glulam frame of a roof structure. Glued laminated timber, also called glulam, is a type of structural engineered wood product The result was the first glulam portal. In , Hetzer moved his company to Ettersburger Strasse, still in Weimar. Key words: construction design, structure, three-pinned frames, long-span, . Glulam portal frames (reproduced from Handbook 1 – Timber structures. ).
|Published (Last):||15 July 2016|
|PDF File Size:||13.19 Mb|
|ePub File Size:||2.62 Mb|
|Price:||Free* [*Free Regsitration Required]|
The laminates are finger-jointed to give greater lengths and then glued together to produce the desired size. Free spans of over m have been built.
Glued laminated timber
After planing of the sides, the finished width is a few millimetres less than the width of the laminates. Glulam Glulam is the term used for beams, arches or columns consisting of several laminates of timber arranged parallel to the longitudinal axis of the member; the individual pieces being assembled with their grains approximately parallel and glued together to form a member which functions as a single structural unit.
The size is limited only by transportation and handling constraints. Shell structures provide a wide choice of advanced forms free from columns. Glulam that has been manufactured in accordance with the rules given in national or European codes is graded in strength classes.
The formal requirements are given in ENwhich classifies two types of glue: Retrieved 2 June It also means architects and engineers have virtually unlimited possibilities when designing their own constructions in glulam, whether the task is a small house, the roof of a department store or a road bridge.
Glue type I may be used for glulam glilam in any climate class, while glue type II is limited to climate classes This is supported by the light weight of the material, combined with the ability to furnish long lengths and large cross-sections.
Here is an example of Swedish glulam cross-sectional dimensions below. International Journal of Life Cycle Assessment In contrast with laser cutting machines, the cost-effective CNC machines carve the material using mechanical tools, like a router.
The appropriate class is determined by the strength of the timber used and its position in the cross-section. From Wikipedia, the free encyclopedia. No other building material can be compared with glulam for expressing architectural glulsm structural possibilities. It compared two options for a roof structure of a new airport in Oslo, Norway — steel beams and glulam spruce wood beams.
Furthermore, when using glulam it is possible to obtain larger cross-sectional dimensions and longer lengths than solid construction timber. Retrieved 3 February Hetzer continued to patent various ingenious systems, but the first of these that could be compared with subsequently standardised horizontal glulam was DRP No.
For larger buildings, two or three pin trusses, portal frames or arch frames of glulam components are suitable.
In North America the material providing the laminations is termed laminating stock or lamstock. The structure was built in Bern inand has subsequently been refurbished and extended. Glulam provides the strength and versatility of large wood members without relying on the old growth-dependent solid-sawn timbers.
Glued laminated timber – Wikipedia
InHetzer moved his company to Ettersburger Strasse, still in Weimar. The glue used in glulam manufacturing has documented high strength and durability under long-term loading.
Prefabrication is invariably employed and the structural engineer needs to develop clear method statements for delivery and erection at an early stage in the design. Glulam finger joints were developed to provide broad surface area for gluing. Straight beams are manufactured with a constant cross-sectional dimension, mono-pitched or double-pitched. CNC machine tools can utilize up to framme axes, which enables undercutting and hollowing-out processes.
Journal of the Southampton Local History Forum. Holy Trinity, Camboand Holy Trinity, Horsleyand four s Merseyside churches also feature laminated timbers: The parts are assembled by nailing, screwing or bolting, unaffected by the time of the year or the weather, and any adjustments can pportal made with simple hand tools.
Sports structures are a particularly suitable application for wide-span glulam roofs. The roof includes 2, cubic metres of Douglas-fir lamstock lumber in glulam beams. Leading architects all over the world have demonstrated their credentials with glulma glulam constructions.