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Crielaard, R. (author), van de Kuilen, J.W.G. (author), Terwel, K.C. (author), Ravenshorst, G.J.P. (author), Steenbakkers, Pascal (author)Cross-laminated timber, or CLT, is receiving attention for its potential application in tall building structures. As a combustible material, one of the main challenges for the construction of these buildings is the fire risk that results from its use in the structure.<br/><br/>Unprotected CLT can burn along with the fuel load present in a...journal article 2019
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Sandhaas, Carmen (author), Khaloian Sarnaghi, A. (author), van de Kuilen, J.W.G. (author)Tests on double-shear steel-to-timber joints loaded parallel-to-grain were undertaken, using beech and azobé with one, three and five dowels in a row. The dowels were made of high strength steel (hss) and very high strength steel (vhss). The experiments have shown a significant difference in load-carrying capacity of joints with vhss and hss...conference paper 2019
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Schlotzhauer, Philipp (author), Kovryga, Andriy (author), Emmerich, Lukas (author), Bollmus, Susanne (author), van de Kuilen, J.W.G. (author), Militz, Holger (author)Background and Objectives: In the near future, in Europe a raised availability of hardwoods is expected. One possible sales market is the building sector, where medium dense European hardwoods could be used as load bearing elements. For the hardwood species beech, oak, and sweet chestnut technical building approvals already allow the production...journal article 2019
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Kamath, A.C. (author), Gard, W.F. (author), van de Kuilen, J.W.G. (author)Timber sheet piles are widely used to protect canal and stream banks. Quite often, riparian vegetation also grows along these retaining structures. Roots of riparian vegetation mechanically reinforce the soil with their root systems. A timber sheetpile- vegetation model is developed taking into account the mechanical reinforcement of the...conference paper 2019
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Gard, W.F. (author), van de Kuilen, J.W.G. (author)Hydraulic timber structures such as mooring poles, fenders, quay walls, lock gates and jetties are widely used in inner and marine harbours all over the world. In general, these structures give satisfactory performance with regard to the technical requirements. Because of the harsh exposure conditions such as brackish and contaminated water,...conference paper 2018
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Westermayr, Maximilian (author), Stapel, Peter (author), van de Kuilen, J.W.G. (author)This paper investigates the tensile strength and stiffness of low quality beech sawn timber. In addition, the influences of visual and physical characteristics of the beech boards on the mechanical performance were analysed. Visual characteristics like knots, pith or fibre deviation as well as density and dynamic modulus of elasticity were...conference paper 2018
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Sarnaghi, Ani Khaloian (author), van de Kuilen, J.W.G. (author)Structural heterogeneities in wood are changing the complexity of the numerical modelling of this material. Knots are the main strength governing parameters, which are changing the uniformity of the stress distributions through the boards. These weak locations may result in failure in the material. Comprehensive reconstruction of the boards,...conference paper 2018
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van de Kuilen, J.W.G. (author), Ravenshorst, G.J.P. (author)There are more than 1000 wood species worldwide available that have the potential to be used in structural applications. Many of these species are tropical hardwood species. In this paper, the mechanical and physical properties of a large number of tropical hardwoods are presented. They are investigated for relationships that are valid for all...conference paper 2018
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Cabaleiro, M. (author), Lindenbergh, R.C. (author), Gard, W.F. (author), Arias, P. (author), van de Kuilen, J.W.G. (author)Cracks may indicate structural problems in constructions made of timber beams, but their identification in notably roof constructions is difficult. Therefore this paper presents an algorithm for the automatic detection of cracks in timber beams sampled by LiDAR data. This algorithm enables the identification, analysis and monitoring of cracks...journal article 2017
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Hunger, F (author), Stepinac, M (author), Rajcic, V (author), van de Kuilen, J.W.G. (author)Ongoing development of timber and timber<br/>products made from European hardwoods like ash and<br/>beech influences the selection of acceptable methods for<br/>connecting these elements and thus demands validation and<br/>application of current design methods for softwood and<br/>glulam. For the last 20 years, despite many national and<br/...journal article 2016
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Kovryga, Andriy (author), Stapel, Peter (author), van de Kuilen, J.W.G. (author)Generally, for structural timber the main properties are listed in a strength class system. In Europe EN 338 (2016) lists available strength class and their respective characteristic properties. Depending on the product application the bending or the tension properties are of main interest. For glulam lamellas, tension classes are preferred as...conference paper 2016
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Kovryga, Andriy (author), Stapel, Peter (author), van de Kuilen, J.W.G. (author)For the production of lamellas for GLT or CLT visually or machine strength graded timber is required. Visual grading allows only for a limited number of classes while reject rates tend to be high. The present paper shows the potential of an evolutionary algorithm NSGA-II optimizing the boundaries of multiple visual grading criteria in a...conference paper 2016
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Misconel, A. (author), Ballerini, M. (author), van de Kuilen, J.W.G. (author)Double-shear steel-to-timber joints of beech laminated veneer lumber (LVL) with slotted-in steel plates using very high strength steel (VHSS) dowels have been investigated. Tensile tests on full-scale joints with one, two, three and six dowels have been carried out, using both VHSS and mild steel dowels. The goal...conference paper 2016
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Ravenshorst, G.J.P. (author), van de Kuilen, J.W.G. (author)The current methods for the determination of the strength properties for wood species for grading purposes require extensive testing. Species independent grading might be a solution for this problem, in particular for tropical hardwoods. The strength reducing characteristics such as knots and slope of grain...conference paper 2016
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Ravenshorst, G.J.P. (author), Gamper, N. (author), van de Kuilen, J.W.G. (author), de Vries, P.A. (author)The current shear strength values for high density tropical hardwoods are very low compared to the values for softwoods, according to European strength class tables. The reason for this is that standardized tests according to European standard EN 408 have not been performed yet for tropical hardwoods. In this...conference paper 2016
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van de Kuilen, J.W.G. (author)Measuring and assessing wood properties during the production chain is getting more and more important for an optimal use of the resource. Over the years, research has been performed with the focus on establishing important wood properties, with the final goal of an optimized use in timber engineering. It is...conference paper 2016
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Crielaard, R. (author), van de Kuilen, J.W.G. (author), Terwel, K.C. (author), Ravenshorst, G.J.P. (author), Steenbakkers, P. (author), Breunesse, A. (author)Cross-laminated timber, or CLT, is receiving attention for its potential use in tall buildings. As a combustible material, one of the challenges for the construction of these buildings is the fire risk that results from its use in the structure. Unprotected CLT can burn along with the fuel load present in a compartment. Irrespective of its fire...conference paper 2016
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Yaitskova, N. (author), Van de Kuilen, J.W.G. (author)Time-of-flight is a time for an ultrasonic pulse to cross a sample. It contains valuable information about the mechanical properties of a material. For the ultrasonic pulse propagating in wood perpendicular to the grain the relation between the time-of-flight and the elastic constants is rather complex due to the strong anisotropicity of wood....journal article 2014
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Stapel, P. (author), Van de Kuilen, J.W.G. (author)Structural timber in Europe is either graded visually or by machine. Both grading methods are applied to limit the variation in engineering properties of sawn timber. The obtained grading results are largely dependent on the method chosen. In addition, parameters such as species, source, and cross-section of the timber, as well as the applied...conference paper 2014
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Jiang, Y. (author), Schaffrath, J. (author), Knorz, M. (author), Winter, S. (author), Van de Kuilen, J.W.G. (author)In a current research project the gluability of four European timber species and their applicability in glued laminated timber is investigated. The influence of different processing parameters on the adhesive bonding is assessed with regard to shear strength and delamination resistance. Furthermore, microscopy-based investigations revealed...conference paper 2014