Skip header and navigation

11 records – page 1 of 2.

Advanced Modelling of Cross Laminated Timber (CLT) Panels in Bending

https://research.thinkwood.com/en/permalink/catalogue1796
Year of Publication
2015
Topic
Mechanical Properties
Material
CLT (Cross-Laminated Timber)
Application
Wood Building Systems
Author
Franzoni, Lorenzo
Lebée, Arthur
Lyon, Florent
Forêt, Gilles
Publisher
HAL archives-ouvertes.fr
Year of Publication
2015
Country of Publication
Germany
Format
Presentation
Material
CLT (Cross-Laminated Timber)
Application
Wood Building Systems
Topic
Mechanical Properties
Keywords
Bending
Model
Panels
Shear
Stiffness
Failure Behavior
Shear Force
Reference Test
Language
English
Conference
Euromech Colloquim 556 Theoretical Numerical and Experimental Analyses of Wood Mechanics
Research Status
Complete
Notes
May 2015, Dresde, Germany
Online Access
Free
Resource Link
Less detail

Cross-Laminated Secondary Timber: Experimental Testing and Modelling the Effect of Defects and Reduced Feedstock Properties

https://research.thinkwood.com/en/permalink/catalogue2104
Year of Publication
2018
Topic
Environmental Impact
Mechanical Properties
Material
CLT (Cross-Laminated Timber)

Design Methods for Load-Bearing Elements from Cross Laminated Timber

https://research.thinkwood.com/en/permalink/catalogue1116
Year of Publication
2015
Topic
Design and Systems
Material
CLT (Cross-Laminated Timber)
Author
Vilguts, Aivars
Serdjuks, Dmitrijs
Goremikins, Vadims
Publisher
IOP Publishing Ltd
Year of Publication
2015
Country of Publication
Latvia
Format
Report
Material
CLT (Cross-Laminated Timber)
Topic
Design and Systems
Keywords
FEM
Bending
Compression
Static Load
Pine
Uniformly Distributed Load
Strength
Stiffness
Language
English
Conference
International Conference on Innovative Materials, Structures and Technologies
Research Status
Complete
Notes
September 30-October 2 2015, Riga, Latvia
Online Access
Free
Resource Link
Less detail

Edge Connection Technology for Cross Laminated Timber (CLT) Floor Slabs Promoting Two-Way Action

https://research.thinkwood.com/en/permalink/catalogue2718
Year of Publication
2020
Topic
Connections
Material
CLT (Cross-Laminated Timber)
Application
Floors
Author
Asselstine, Julian
Publisher
University of British Columbia
Year of Publication
2020
Country of Publication
Canada
Format
Thesis
Material
CLT (Cross-Laminated Timber)
Application
Floors
Topic
Connections
Keywords
Bending
Two-Way
Self-Tapping Screws
Stiffness
Modulus of Elasticity
Language
English
Research Status
Complete
Summary
Cross-laminated timber (CLT) is a class of engineered wood product with the ability to act as a flat plate floor system transferring loads in two-directions due to the orthogonally crossed layers. Currently, dimensional limitations from manufacturing and transportation limit the minor span to about 3.0 m. This results in under utilization of the bending properties of the cross-layers or the choice of a different product because of the common use of one-way bending support conditions such as drop beams simply supporting the ends of the longer span. This study investigates the performance of a newly developed edge connection system to maintain continuity in the minor direction span of CLT and promote two-way bending action. Three connections utilizing a tension splice fastened to the underside of the panel edges with self-tapping screws are investigated, with experimental results showing promise to maintain a high level of stiffness. This connection system was placed in the maximum moment location of the minor span - attaining a connected span modulus of elasticity up to 1.17 times the intact span modulus of elasticity, indicating a reinforcing effect created by the connection. Further, the minor direction span is additionally stiffened through the use of parallel-strand lumber rim beams fixed to the edges of the CLT in the minor direction span and hidden within the cross-section of the CLT. ANSYS finite element modelling calibrated and validated from the experimental results show the potential of this flat-plate system using 5-layer CLT to reach column spacing of 6.0 m by 6.0 m limited by deflection under a serviceability limit state uniformly distributed load of 3.25 kPa. This claim maintains a high degree of conservatism, as the boundary stress obtained from the minimum observed failure load is greater than 6 times the maximum stress at an ultimate limit state load of 4.67 kPa. This system has the ability to expand the flexibility for designers to utilize CLT more efficiently and create large open floor spaces uninhibited by drop-beams.
Online Access
Free
Resource Link
Less detail

Experimental Research on Structural Behaviors of Glulam I-Beam with a Special-Shaped Section

https://research.thinkwood.com/en/permalink/catalogue2447
Year of Publication
2020
Topic
Design and Systems
Mechanical Properties
Material
Glulam (Glue-Laminated Timber)
Application
Beams
Author
Yang, Ruyuan
Hong, Chaokun
Zhang, Xiaofeng
Yuan, Quan
Sun, Youfu
Publisher
Tech Science Press
Year of Publication
2020
Country of Publication
United States
Format
Journal Article
Material
Glulam (Glue-Laminated Timber)
Application
Beams
Topic
Design and Systems
Mechanical Properties
Keywords
Flange Thickness
Shear Pan Ratio
Stiffener
Stiffness
Bending
Failure
Language
English
Research Status
Complete
Series
Journal of Renewable Materials
Online Access
Free
Resource Link
Less detail

Innovative Hybrid Timber Structures in Japan: Bending Behaviour of T-Shaped CLT-to-Hybrid Timber Composite Beam

https://research.thinkwood.com/en/permalink/catalogue1600
Year of Publication
2016
Topic
Design and Systems
Mechanical Properties
Material
CLT (Cross-Laminated Timber)
Glulam (Glue-Laminated Timber)
Application
Beams
Author
Yagi, Hidemi
Shioya, Shinichi
Tomiyoshi, Eriko
Year of Publication
2016
Country of Publication
Austria
Format
Conference Paper
Material
CLT (Cross-Laminated Timber)
Glulam (Glue-Laminated Timber)
Application
Beams
Topic
Design and Systems
Mechanical Properties
Keywords
Bending
Stiffness
Strength
Japanese Cedar
Steel Bars
Epoxy
Language
English
Conference
World Conference on Timber Engineering
Research Status
Complete
Notes
August 22-25, 2016, Vienna, Austria p. 1939-1947
Summary
Hybrid composite glulam timber reinforced using deformed steel bars and epoxy resin adhesive (RGTSB), was significantly developed in Kagoshima University. In this paper, new experimental data on structural behaviour of CLT-to-the RGTSB composite beams is presented. Two full-scale simply-supported beams were tested...
Online Access
Free
Resource Link
Less detail

Performance Based Tests on Cross Laminated Timber - Concrete Composite Floor Panels

https://research.thinkwood.com/en/permalink/catalogue1423
Year of Publication
2017
Topic
Mechanical Properties
Material
CLT (Cross-Laminated Timber)
Timber-Concrete Composite
Application
Floors

A Post-tensioned Cross-Laminated Timber Core for Buildings

https://research.thinkwood.com/en/permalink/catalogue2700
Year of Publication
2020
Topic
Connections
Mechanical Properties
Design and Systems
Material
CLT (Cross-Laminated Timber)
Application
Cores
Walls
Author
Znabei, Tigist
Year of Publication
2020
Format
Thesis
Material
CLT (Cross-Laminated Timber)
Application
Cores
Walls
Topic
Connections
Mechanical Properties
Design and Systems
Keywords
Prestress
Post-Tensioning
Bending
Shear Stiffness
Core Structure
Compressive Strength
Language
English
Research Status
Complete
Summary
This master thesis is on post-tensioning cross-laminated timber stability cores for multiple story buildings. When designing a CLT core, significantly larger core sections will be needed than when designing a stabilizing core in concrete. This is for one part due to the limited stiffness of the CLT compared to concrete. For another part it is due to the limited stiffness of connectors in CLT. Sliding and uplift can occur in connections in CLT loaded in tension and shear respectively. The CLT panels behave like rigid bodies, with most of the displacement occurring at the connections. In addition, cooperation between flange and web may be limited, depending on the stiffness of the corner connection and the occurrence of shear lag. Post-tensioning is suggested as a solution to diminish uplift and sliding in the connectors. In this way, with the same core section, a taller building may be realized compared to the non-post-tensioned case. In the thesis also the long-term effects on the prestress level is assessed, as estimating these effects is important for the safety of the system.This thesis adds to the body of knowledge on post-tensioned CLT structures. Firstly, previous studies on post-tensioned CLT focus on individual shear walls and on seismic design situations. This thesis explores how beneficial post-tensioning is from the perspective of serviceability limit state governed design. Furthermore, though post-tensioning as a prestressing method has been applied often in concrete structures, prestressing of CLT is a novel research subject. Especially the estimation of long-term force loss is a topic that still requires research. This thesis provides the designer with a straightforward calculation method (using python) for estimation of prestress force loss in the long-term.The research was carried out with a literature study and a case-study. The literature research comprised of studies on structural design with CLT loaded in-plane; the effective flange of a CLT core; stiffness of connections in CLT; prestressing of CLT; a design approach for post-tensioning; time dependent losses in post-tensioned CLT. The case study was based on a fictitious floorplan including a “minimal core”, and at expressing the benefit of post-tensioning in terms of height gain.The degree to which the flange and the web cooperate showed highly dependent on the connection between flange and web and the core height. In the case study, the effective flange width showed to depend highly on the height of the core and the stiffness of the connection between flange and web.In the case-study, without post-tensioning, approximately half of the displacements could be attributed to the connections. With post-tensioning, the uplift and sliding displacements in the horizontal joints was eliminated. Consequently, the attainable height was significantly increased: from 5 storeys in the un-post-tensioned case, to 8 storeys in the post-tensioned case. Long-term effects on the prestress loss were considerable. In the case-study, approximately 40% loss of post-tension force in the lifetime of the building was predicted and included in the design. Largest causeof force loss was due to changes of moisture content during construction. The remaining lateral displacements after post-tensioning were due to bending and shear.Post-tensioning of CLT cores is a powerful method for reducing lateral displacements in cases where uplift and sliding are dominant contributors to the lateral displacements. This is especially the case in light-weight buildings. Uplift and sliding displacements can be eliminated altogether with post-tensioning. The designer should realize that post-tensioning does not increase the bending and shear stiffness of the core. The thesis also concludes that with the post-tensioning of CLT walls, the compressive strength of the CLT in the so-called “compression-toe” might be exceeded. It is an important check in design. Furthermore, depending on the decision to re-tighten the rods at some point or not, the post-tension force loss should be calculated and included in finding the right prestress level. For this estimation of the moisture level of the CLT proved to be an important but difficult step. It is likely that the 40% force loss in the case-study is on the conservative side, since a large change in moisture content has been assumed. In practice, the moisture content can be measured on site. This can help verify the assumptions on the moisture content used in force loss calculations. This can help in assuring the structure is safe in the long-term.
Online Access
Free
Resource Link
Less detail

Serviceability Performance of Timber Concrete Composite Floors

https://research.thinkwood.com/en/permalink/catalogue2353
Year of Publication
2019
Topic
Serviceability
Material
Timber-Concrete Composite
Application
Floors
Author
Tannert, Thomas
Mehdi Ebadi, Md
Gerber, Adam
Year of Publication
2019
Country of Publication
Canada
Format
Journal Article
Material
Timber-Concrete Composite
Application
Floors
Topic
Serviceability
Keywords
Hybrid
Concrete Slab
Bending
Vibration
Long-term Performance
Stiffness
Language
English
Research Status
Complete
Series
Modular and Offsite Construction (MOC)
Notes
DOI: https://doi.org/10.29173/mocs95
Online Access
Free
Resource Link
Less detail

Structural Performance of Nail-Laminated Timber-Concrete Composite Floors

https://research.thinkwood.com/en/permalink/catalogue2146
Year of Publication
2017
Topic
Connections
Material
NLT (Nail-Laminated Timber)
Timber-Concrete Composite
Application
Floors
Author
Hong, Kwan Eui Marcel
Organization
University of British Columbia
Year of Publication
2017
Country of Publication
Canada
Format
Thesis
Material
NLT (Nail-Laminated Timber)
Timber-Concrete Composite
Application
Floors
Topic
Connections
Keywords
Truss Plates
Self-Tapping Screws
Strength
Stiffness
Shear Connectors
Quasi-Static Loading Test
Bending
Language
English
Research Status
Complete
Summary
Nail-laminated timber-concrete composite (TCC) is a system composed of a nail-laminated timber (NLT) panel connected to a concrete slab through shear connections. When used as flexural elements such as floors, the concrete and NLT are located in the compression and tension zones, respectively...
Online Access
Free
Resource Link
Less detail

11 records – page 1 of 2.