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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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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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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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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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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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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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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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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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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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Gard, W.F. (author), Van de Kuilen, J.W.G. (author), Cabrera de Diego, M. (author)Hydraulic timber structures such as mooring poles, fenders, lock gates and jetties are widely-used in inner and sea 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, drying-out,...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
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Van de Kuilen, J.W.G. (author), Xia, Z. (author)Cross laminated timber (CLT) has been rapidly developed and utilized for multi-rise constructions in recent years, even high-rise CLT buildings with 40 stories have been proposed and designed. A use of unbonded post-tensioning (PT) steel bars through over CLT walls of the high-rise CLT buildings to take up the tensile forces produced by wind...conference paper 2014
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Van de Kuilen, J.W.G. (author), Otterloo, J. (author), Ravenshorst, G.J.P. (author), De Vries, P. (author)Wooden mitre gates are used for centuries in waterways and canals. For newly built as well as the renewal of such gates, a number of wood species is used, ranging from oak to dense tropical hardwoods. As mitre gates have high loads to withstand, their strength verification has become more and more important. As strength verification rules for...conference paper 2014
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Kovryga, A. (author), Stapel, P. (author), Van de Kuilen, J.W.G. (author)The quality assurance of timber properties is important for the safety of timber structures. In the current study, the quality control options of timber are analysed under the prism of the different growth regions. Therefore, these options - machine and output control - are simulated in accordance with EN 14081, and the performance is assessed...conference paper 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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Ravenshorst, G.J.P. (author), Gard, W.F. (author), Van de Kuilen, J.W.G. (author)Strength class assignments and durability class assignments of wood species to be used in structures are necessary to make it possible for the engineer to design safe and durable timber structures. As a result of sustainable managed forests, more tropical wood species with relative small batch size, are coming on the market. In Europe, strength...journal article 2013
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- Stepinac, M. (author), Hunger, F. (author), Tomasi, R. (author), Serrano, E. (author), Rajcic, V. (author), Van de Kuilen, J.W.G. (author) conference paper 2013
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Sandhaas, C. (author), Van de Kuilen, J.W.G. (author)Wood is highly anisotropic and shows ductile behaviour in compression and brittle behaviour in tension and shear where both failure modes can occur simultaneously. A 3D material model for wood based on the concepts of continuum damage mechanics was developed. A material subroutine containing the developed model was implemented into a standard FE...journal article 2013
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Surmeli, A.N. (author), Ravenshorst, G.J.P. (author), Van de Kuilen, J.W.G. (author)The current practice is that the deformations of timber façade elements are determined by testing, or they are limited by prescribing dimensions in a very conservative way. To use generic calculation models, suitable for almost all types of windows, approximations deviating from the actual behaviour have to be done. This paper investigates if a...report 2013
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- van de Kuilen, J.W.G. (author), Gard, W.F. (author) conference paper 2012