Searched for: subject%3A%22hardwoods%22
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Peet, Myrthe (author)
The life span of buildings is currently largely determined by economic motives. This often results in a large number of vacant buildings, or unsubstantiated demolition. Since the building industry has the most significant consumption of natural resources compared to other industries worldwide, it is important that the ecological motive gets...
master thesis 2023
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Kalaichelvi Senthil Kumar, Ganesh ShriRaam (author)
Given the desire to construct more structures using sustainable building materials, demand for wood and other bio-based building materials has risen dramatically over the decade. While timber itself is a carbon-neutral material and can sometimes even be carbon-negative, reusing wooden structural members made that have been in service for several...
master thesis 2023
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Rademaker, Rolf (author)
The demand to build with wood and other bio-based materials has increased rapidly the last decade, due to the ambition to build more with sustainable building materials. One of the major challenges in building with wood, is to account for the lower strength and stiffness perpendicular to the grain. Wood is an anisotropic material, meaning the...
master thesis 2022
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Nijkamp, Robert (author)
Self-tapping screws are popular tools used in timber engineering. The axial withdrawal strength of self-tapping screws could be used in timber structures as an active or passive application. An example of an active application is the use as a fastener in wall to wall connections. An example of a passive application is the use as reinforcement...
master thesis 2022
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Gijzenberg, Kees-Jaap (author)
The goal of the thesis is to investigate two main questions for the purpose of modelling fractures in timber with a finite element method. The first question is to evaluate the use of digital image correlation during a three point bending test to obtain mean values for tensile strength and fracture energy, and the follow up question is if it is...
master thesis 2022
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Westermayr, Maximilian (author), Zeilhofer, Monika (author), Rais, Andreas (author), Kovryga, Andriy (author), van de Kuilen, J.W.G. (author)
The market share of European beech (Fagus sylvatica L.) wood in the construction sector is low despite an increase in beech stock in Central European Forests in recent years. More efficient sawing techniques, higher lamella grading yields and solving of adhesion challenges may increase the competitiveness of beech glulam and promote its use....
journal article 2022
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Kamath, A.C. (author), Gard, W.F. (author), van de Kuilen, J.W.G. (author)
Tropical hardwood or treated wooden sheet piles have been used historically to protect stream banks in countries like the Netherlands. However, there is an imminent need for alternative as exploitable tropical hardwood forests available in the country is limited. Locally available softwoods are less resistant to decay and in extreme conditions...
conference paper 2021
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Chen, Xianyue (author)
Timber as a renewable source has been extensively applied among European countries in the construction field. Among more than 1000 available wood species which could be potentially applied as engineered wood, tropical hardwood takes up a significant portion and has advantages of high mechanical resistance and remarkable biological durability...
master thesis 2020
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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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Kloppenburg, Alexander (author)
This research focused on the question whether it is possible to predict the density of tropical hardwoods with acceptable accuracy based on drill resistance measurements. To assess the feasibility, the influence of the characteristics of the drill resistance measurement tool; the Resistograph® and the wood species have been investigated. With...
master thesis 2018
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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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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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Tsalidis, G.A. (author), Di Marcello, M. (author), Spinelli, G. (author), de Jong, W. (author), Kiel, J.H.A. (author)
Torrefaction is a promising biomass upgrading method, offering advantages in logistics and handling. Gasification is an attractive thermochemical conversion technology due to its flexibility in the product gas end-use. The aim of this paper is to investigate the impact of torrefaction on the gasification performance of a softwood (spruce) and...
journal article 2017
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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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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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Ravenshorst, G.J.P. (author)
Timber as a construction material has been used for millennia, but the research field covering the prediction of the strength of structural timber is still in development. Currently, the common conception is that the determination of strength properties has to be determined for every wood species individually. By combining these strength...
doctoral thesis 2015
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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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