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. ).
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Glued laminated timber
Glulam has greater strength and stiffness than structural timber of similar dimensions. Glulam also has a better strength to weight ratio than steel. This means that glulam beams can span large distances with a minimal need of intermediate supports. 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. Wood is one of the oldest construction materials in the world.
Buildings, bridges and ships have been built in timber for many centuries. No other material has such a wide range of uses. Glulam — glued laminated timber — opens up still further possibilities for wood building technology. Glulam has many applications: Glulam consists of individual laminates of structural timber, providing a highly effective utilization of the raw material.
The laminates are finger-jointed to give greater lengths and then glued together to produce the desired size. Due to the production technology, very large structural components are possible. Little energy is needed for the manufacture of glulam. The glulam technology allows the manufacture of thick, wide and very long components; not just simple straight but curved elements too. Straight beams are manufactured with a constant cross-sectional dimension, mono-pitched or double-pitched.
For larger buildings, two or three pin trusses, portal frames or arch frames of glulam components are suitable. Portal frames can have curved or finger-jointed haunches. Glulam beams can be arranged in the form of a grid. Shell structures provide a wide choice of advanced forms free from columns.
There are also many complex structural systems, e. One advantage is that all glulam components can be made in the factory in suitable sections for transportation, and then assembled on the building site.
Glued laminated timber – Wikipedia
Free spans of over m have been built. No other building material can be compared with glulam for expressing architectural or structural possibilities. Leading architects all over the world have demonstrated their credentials with spectacular glulam constructions.
When dealing glulxm wide spans, glulam products are the best choice for framing.
Glulam structures can be erected quickly and simply by using prefabricated units. The parts are assembled by nailing, screwing or bolting, unaffected by the time of the year or the weather, and any adjustments can be made with simple hand tools.
A glulam frame can carry its full load immediately after the assembly. Glulam is the term used for beams, arches or columns consisting of several laminates of timber arranged parallel to the longitudinal glluam 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.
In elements of this type, any characteristics or features, such as knots, which may exist in the individual laminates, are equally spread, unlike a solid timber element from the same species. Furthermore, when using glulam it is possible to obtain larger cross-sectional dimensions and longer lengths than solid construction timber. Certified glulam is the accepted term for glulam with at least four laminates, that has been manufactured, controlled and marked according to certain rules.
EN Timber Structures — Glued laminated timber — Requirements is the European standard specifies the requirements for glued laminated timber products used in load-bearing structures, and deviations from target size corresponding porrtal tolerance class requirements.
Certified glulam is marked in accordance with porhal standard. Glulam that has been manufactured in accordance with the rules given in national or European codes is graded in strength classes. The appropriate class is determined by the strength of the timber used and its position in the cross-section. The strength and stiffness values of the various strength classes are then given in the code.
Frzme manufactured in Sweden corresponds to strength classes in accordance with Eurocode 5. Glulam manufactured by other methods than according to the regulations contained in the codes, e. The glue used in glulam manufacturing has documented high strength and durability under long-term loading. Only glues of which the industry has long-term practical experience are used. The formal requirements are given in ENwhich classifies two types of glue: Glue type I may be used for glulam construction in any climate class, while glue type II is limited to climate classes A list poortal approved glues is kept by the Nordic Glulam Control Board.
glulzm After planing of the sides, the finished width is a few millimetres less than the width of the laminates. Here is an example of Swedish glulam cross-sectional dimensions below. The following sizes in the table are in stock and should be the first choice, especially if only a few beams are involved. Other dimensions are also available depending on the factories’ capability.
An appealing aesthetic appearance which acts as a valuable addition to the interior and exterior environment. Small manufacturing tolerances pportal good form stability within normal temperature and moisture conditions.
Good heat insulating characteristics, reducing the effect of cold bridges and the risk of condensation. Low weight, resulting in low transport and erection glullam and reducing the cost of foundations. Flexible production, enabling curved structural components to be produced at lower costs than other materials. Glulam construction Glulam has greater strength and stiffness than structural timber of similar dimensions.
Modern glulam technology Wood is one of the oldest construction materials in the world.
Structural design The glulam technology allows the manufacture of thick, wide and very long components; not just simple straight but curved elements too.
Architectural design and construction No other building material can be compared with glulam for expressing architectural or structural possibilities.
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.
Advantages of using glulam An appealing aesthetic appearance which acts as a valuable addition to the interior and exterior environment. A high strength to weight ratio, enabling wide spans. High resistance to fire — often a requirement in public buildings. Long life in chemically demanding environments.