Development of a joint system using a compressed wooden fastener I: evaluation of pull-out and rotation performance for a column—sill joint

Jung, Kiho; Kitamori, Akihisa; Komatsu, Kenshi

doi:10.1007/s10086-009-1027-3

Cited by 13 publications

(4 citation statements)

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“…It was also shown that as the density of the dowel is increased, the results show a proportional improvement in stiffness, yield load and maximum load (Jung et al, 2008). When used in post-and-beam connections, densified wood dowels showed very good properties in resisting pull-out and moment rotation forces and demonstrated the potential for this type of modified timber material to be used for structural purposes such as long-span frame structures and has the potential to be further optimised (Jung et al, 2009). The densified wood used in this study was produced by thermo-mechanical compression of softwood timber (Scots pine -Pinus sylvestris) to increase its density, strength, stiffness and hardness (Mehra et al, 2019(Mehra et al, , 2018 making it highly suited to demanding applications.…”

Section: Densified Wood Dowelsmentioning

confidence: 95%

Densified wood dowel reinforcement of timber perpendicular to the grain: a pilot study

Conway

Mehra

Harte

et al. 2021

Journal of Structural Integrity and Maintenance

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An investigation was carried out to examine the potential to utilise densified wood dowels as a reinforcement for timber subjected to compression loading perpendicular to the grain. While timber has a high strength-to-weight ratio parallel to the grain, it demonstrates poor strength perpendicular to the grain and in recent years there has been a significant number of studies examining the use of steel screws and bonded-in rods as reinforcement in this area. This is becoming more and more important with the increased use of timber in medium-to-high rise structures. In this study, thermo-mechanical densified wood in the form of dowels are utilised as compression reinforcement perpendicular to the grain and tested to failure. Thermo-mechanically densified dowel reinforcement arrangements of 2, 4, and 6 dowels are examined experimentally under a compressive load and compared to timber samples similarly reinforced but with steel selftapping screws. The results have demonstrated the potential to utilised densified wood to create an all-wood solution to reinforce against compressive stresses perpendicular to the grain. Additionally, modifications to recently proposed Eurocode 5 recommendations for the design of compression reinforcement using self-tapping steel screws are presented, which are suitable for the design of compression reinforcement using densified wood dowels.

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Section: Densified Wood Dowelsmentioning

confidence: 95%

Densified wood dowel reinforcement of timber perpendicular to the grain: a pilot study

Conway

Mehra

Harte

et al. 2021

Journal of Structural Integrity and Maintenance

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“…The ultimate load of the joint increased linearly with increasing density of the base member but increasing density of the base member had a negative influence on the ductility of the joint. In 2009 and 2010, Jung et al [101][102][103] studied densi loaded in shear in beam-column, beam-beam, and glued-in the results showed that the densified dowels exhibited strength and joint rotation performance than conventional properties of the glued-in-rod joints using densified dowel to cyclic humidity and after soaking for 24 h in cold water wood could act as a suitable substitute for maple in dowel In 2009 and 2010, Jung et al [101][102][103] studied densified Japanese cedar as dowels loaded in shear in beam-column, beam-beam, and glued-in-rods systems (Figure 12), and the results showed that the densified dowels exhibited a relatively higher pull-out strength and joint rotation performance than conventional maple dowels. The mechanical properties of the glued-in-rod joints using densified dowels also remained after exposure to cyclic humidity and after soaking for 24 h in cold water and they stated that densified wood could act as a suitable substitute for maple in dowel connections, especially where severe compression or a high shear-stress concentration occurs.…”

Section: Dlts Assembled With Thm-densified Wooden Dowelsmentioning

confidence: 99%

Adhesive-and Metal-Free Assembly Techniques for Prefabricated Multi-Layer Engineered Wood Products: A Review on Wooden Connectors

Han

Kutnar

Sandak

et al. 2023

Forests

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Engineered wood products (EWPs) are being increasingly used as construction materials. EWPs are currently being made using synthetic adhesives or metal fasteners, which lead to poor recyclability and reusability. Therefore, this review paper focused on emerging adhesive- and metal-free assembling techniques including wood dowels, rotary-dowel welding, wooden nails, and dovetail joining as alternative ways of making prefabricated EWPs. This will contribute towards green construction and optimising the building process to minimise its negative impact on the environment and its inhabitants, while maximising the positive aspects of the finished structure. The respective advantages and shortcomings will be compared with those of equivalent EWPs. In general, the dowel-laminated timber (DLT) provides sufficient load-bearing capacity and even better ductility than EWPs of equivalent size, but its relatively low stiffness under a bending load limits its application as a structural element. Optimised manufacturing parameters such as dowel species, dowel spacing, dowel diameter, dowel insertion angle, dowel shape, etc. could be studied to improve the stiffness. The improved mechanical properties and tight fitting due to set-recovery of densified wood support its use as sustainable alternatives to hardwood dowels in DLT to overcome problems such as the loosening of connections over time and dimensional instability. The rotary welding technology could also enhance the strength and long-term performance of dowel-type joints, but its poor water resistance needs further investigation. The main obstacles to implementing DLT products in the market are missing technical information and design guidelines based on national codes.

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“…To prevent severe raw material shortages in the future [4], instead of using solid timber, engineered timber materials such as laminated veneer lumber (LVL) [33], laminated strand lumber (LSL) [34], and CLT [35,36] are mainly used. Compressed timber plates and dowels are used to connect members in post-andbeam structures as a substitute for a steel fastener [37][38][39][40]. Moreover, there is an amplified imperative to protect timber when conserving historical timber structures, where the combustion properties of aged wood differ significantly from those of fresh timber [41,42].…”

Section: Timber Chemical and Physical Propertiesmentioning

confidence: 99%

Contemporary Fire Safety Engineering in Timber Structures: Challenges and Solutions

Zang,

Liu,

et al. 2023

Fire

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As environmental conservation and sustainability gain prominence globally, modern timber structures are receiving increased focus. Nonetheless, the combustible nature of timber raises significant fire safety concerns. This review explores the recent advancements in fire safety engineering for timber structures, emphasizing both contemporary high-rise buildings and historical timber constructions. It covers topics like inherently safer design principles, fire risk prediction, and evacuation methodologies. The review emphasizes the criticality of selecting suitable materials, structural design, firefighting systems, and advanced sensor technologies for early fire detection. Additionally, we analyze and compares various evacuation strategies, offering insights into the challenges and future directions for fire safety in modern timber structures.

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Development of a joint system using a compressed wooden fastener I: evaluation of pull-out and rotation performance for a column—sill joint

Cited by 13 publications

References 4 publications

Densified wood dowel reinforcement of timber perpendicular to the grain: a pilot study

Densified wood dowel reinforcement of timber perpendicular to the grain: a pilot study

Adhesive-and Metal-Free Assembly Techniques for Prefabricated Multi-Layer Engineered Wood Products: A Review on Wooden Connectors

Contemporary Fire Safety Engineering in Timber Structures: Challenges and Solutions

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