Self-tapping screws are efficient and flexible fasteners, applicable for many types of connections. Investigations on axially loaded groups of screws pointed out, that small spacing between the screws lead to block shear failure mode. So far, block and plug shear failure mode are only analysed for laterally loaded fasteners...
Within this paper a comparison of different reinforcement concepts for timber beams with round holes is carried out. Therefore currently applied standardized methods and two recently developed approaches are considered. By means of numerical and analytical investigations it becomes apparent that the analysed reinforcement methods...
In this contribution bending and shear tests of cross laminated timber (CLT) plates under concentrated loads are presented. The so loaded structural members can fail either due to punching along a critical perimeter line in the vicinity of the concentrated load or in bending. Two test configurations were developed and investigated by linear...
The topic of this paper is the discussion of a proposal for the design of ribbed plates built-up with CLT (plate)- and GLT (ribs)- members. The suggested elastic model is based on the work of Abdelouahed [13] and Smith and Teng [14] for the strengthening of concrete members with FRP plates and will be applied for the mentioned loadcarrying...
Cross-laminated timber has conquered new markets since the publication of volume I Basic design and engineering principles according to Eurocode. The present volume II describing Applications provides the designer of timber structures on the one hand with basics for design factors, mechanical properties and modelling with finite element method. On the other hand it describes in detail the design of floors, ribbed plates and walls e.g. by design approaches regarding forces in joints of plates and diaphragms, concentrated loads, openings, effective width and compression perpendicular to grain. Current scientific knowledge as well as experience from practical engineers is taken into account. 15 examples demonstrate the design approaches as references for practitioners. Closing background information for the shear correction coefficient, deformations due to concentrated loads and the modelling of crosslaminated timber as general grillage will illuminate the background and facilitate deeper understanding of the design with cross-laminated timber.
Introduction of Concentrated Loads in CLT Wall Elements Parallel to Plane – Analytical Model for the Determination of Stresses and Simplification for Practice
In this paper a proposal for the computation of stresses into orthotropic panels (e.g. CLT wall elements) caused by concentrated local load introduction in plane is derived on the basis of linear elastic mechanics. In practice the concept of effective width is often applied for the approximate determination of stresses. On the basis of the elastic...
Mechanical Properties of a Composite Lamella Built Up with Thin Sideboards and
its Utilization to Increase the Material Efficiency of Structural Elements
To increase the material efficiency of Cross Laminated Timber (CLT) a composite lamella was investigated. The lamella with a hollow cross section was built up with spruce sideboards. The hollow-lamellas (HL) have high mechanical properties. Two different types of...
Hasslacher Norica Timber is a wood processing company with about 1,000 employees and plants in Austria, Slovenia and Russia. In the forest around their Russian sawmill “HasslacherLes” the wood species birch (Betula pendula) is growing in large quantities and cut-able qualities. The company has also very modern equipment for...
In this contribution proposals for the resource optimised production of laminar, load carrying timber elements are shown. Therefore also analogies to the ship and aircraft/aerospace engineering as well as to the furniture industry have been considered.
Screw gluing (SG) is an alternative method for the pressure application during the adhesive bonding in cases when hydraulic presses are not applicable. Since the pressure level obtained with screws is relatively low and...
