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Experimental and Numerical Analysis of Mixed I-214 Poplar/Pinus Sylvestris Laminated Timber Subjected to Bending Loadings

https://research.thinkwood.com/en/permalink/catalogue2592
Year of Publication
2020
Topic
Mechanical Properties
Material
Glulam (Glue-Laminated Timber)
Author
Rescalvo, Francisco
Timbolmas, Cristian
Bravo, Rafael
Gallego, Antolino
Publisher
MDPI
Year of Publication
2020
Format
Journal Article
Material
Glulam (Glue-Laminated Timber)
Topic
Mechanical Properties
Keywords
Poplar
Pine
Bending
Numerical Modelling
Non-Destructive Testing
Language
English
Research Status
Complete
Series
Materials
Summary
The structural use of timber coming from fast growing and low-grade species such as poplar is one of the current challenges in the wood value chains, through the development of engineering products. In this work, a qualitative comparison of the behavior of mixed glued laminated timber made of pine in their outer layers and of poplar in their inner layers is shown and discussed. Single-species poplar and pine laminated timber have been used as control layouts. The investigation includes destructive four-point bending tests and three non-destructive methodologies: finite elements numerical model; semi-analytical model based on the Parallel Axes theorem and acoustic resonance testing. An excellent agreement between experimental and numerical results is obtained. Although few number of samples have been tested, the results indicate that the use of poplar as a low-grade species in the inner layers of the laminated timber can be a promising technology to decrease the weight of the timber maintaining the good mechanical properties of pine. Likewise, the need for the use of the shear modulus in both experimental measurements and numerical analysis is suggested, as well as the need to reformulate the vibration methodology for non-destructive grading in the case of mixed timber.
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Glued-in Rods in Cross Laminated Timber – Numerical Simulations and Parametric Studies

https://research.thinkwood.com/en/permalink/catalogue2231
Year of Publication
2019
Topic
Connections
Mechanical Properties
Material
CLT (Cross-Laminated Timber)
Author
Azinovic, Boris
Danielsson, Henrik
Serrano, Erik
Kramar, Miha
Publisher
ScienceDirect
Year of Publication
2019
Country of Publication
Netherlands
Format
Journal Article
Material
CLT (Cross-Laminated Timber)
Topic
Connections
Mechanical Properties
Keywords
Glued-In Rods
FE Analysis
Numerical Modelling
Load Bearing Capacity
Language
English
Research Status
Complete
Series
Construction and Building Materials
Online Access
Free
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Hybrid Cross Laminated Timber Plates (HCLTP) – Numerical Optimisation Modelling and Experimental Tests

https://research.thinkwood.com/en/permalink/catalogue1751
Year of Publication
2016
Topic
Design and Systems
Mechanical Properties
Material
CLT (Cross-Laminated Timber)
Author
Sustersic, Iztok
Brank, Boštjan
Dujic, Bruno
Brezocnik, Jaka
Gavric, Igor
Aicher, Simon
Dill-Langer, Gerhard
Winter, Wolfgang
Fadai, Alireza
Demschner, Thomas
Ledinek, Gregor
Year of Publication
2016
Country of Publication
Austria
Format
Conference Paper
Material
CLT (Cross-Laminated Timber)
Topic
Design and Systems
Mechanical Properties
Keywords
Timber Ribs
Concrete Topping
Ultimate Limit States
Serviceability Limit States
Numerical Modelling
Experimental Tests
Language
English
Conference
World Conference on Timber Engineering
Research Status
Complete
Notes
August 22-25, 2016, Vienna, Austria p. 4989-4996
Summary
This paper presents the development of two new types of hybrid cross-laminated timber plates (HCLTP) with an aim to improve structural performance of existing cross-laminated timber plates (Xlam or CLT). The first type are Xlam plates with glued timber ribs and the second type are Xlam plates with a concrete topping. A numerical...
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Influence of Lamination Aspect Ratios and Test Methods on Rolling Shear Strength Evaluation of Cross Laminated Timber

https://research.thinkwood.com/en/permalink/catalogue2367
Year of Publication
2019
Topic
Design and Systems
Mechanical Properties
Material
CLT (Cross-Laminated Timber)
Application
Wood Building Systems
Author
Li, Minghao
Dong, Wenchen
Lim, Hyungsuk
Year of Publication
2019
Country of Publication
United States
Format
Journal Article
Material
CLT (Cross-Laminated Timber)
Application
Wood Building Systems
Topic
Design and Systems
Mechanical Properties
Keywords
Rolling Shear Strength
Lamination Aspect Ratio
Short-Span Bending
Numerical Modelling
Douglas-Fir
Radiata Pine
Language
English
Research Status
Complete
Series
Journal of Materials in Civil Engineering
Summary
Rolling shear (RS) strength may govern load carrying capacity of cross laminated timber (CLT) subjected to high out-of-plane loading because high RS stresses may be induced in cross layers and wood typically has low RS strength. This study investigates RS strength properties of none-edge-glued CLT via experimental testing (short-span bending tests and modified planar shear tests) and numerical modelling. CLT specimens with different manufacturing parameters including two timber species (New Zealand grown Douglas-fir and Radiata pine), three lamination thickness (20 mm, 35 mm, and 45 mm) and various lamination aspect ratios (4.1~9.8) were studied. The lamination aspect ratio was found to have a substantial impact on RS strength of CLT. Higher aspect ratios led to a significant increase of RS strength and an approximately linear relationship could be established. With similar lamination aspect ratios, the Radiata pine CLT had higher RS strength than the Douglas-fir CLT. The two different test methods, however, yielded comparable RS strength assessments. Numerical models were further developed to study the influence of the test configurations and gaps in the cross layers on stress distributions in the cross layers. It was also found the compressive stresses perpendicular to grain in cross layers had negligible influence on the RS strength evaluations.
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Non-Linear Numerical Modelling of a Post-Tensioned Timber Frame Building with Dissipative Steel Angle Devices

https://research.thinkwood.com/en/permalink/catalogue649
Year of Publication
2014
Topic
Seismic
Material
Glulam (Glue-Laminated Timber)
Application
Wood Building Systems
Author
Simonetti, Michele
Smith, Tobias
Carlo Ponzo, Felice
Di Cesare, Antonio
Pampanin, Stefano
Nigro, Domenico
Year of Publication
2014
Country of Publication
Turkey
Format
Conference Paper
Material
Glulam (Glue-Laminated Timber)
Application
Wood Building Systems
Topic
Seismic
Keywords
Numerical modelling
Pres-Lam
Non-linear Dynamic Loading
Static Loading
Beam-Column Joint
Dissipative Steel Angles
Language
English
Conference
European Conference on Earthquake Engineering and Seismology
Research Status
Complete
Notes
August 25-29, 2014, Istanbul, Turkey
Summary
This paper describes the numerical modelling of post-tensioned timber (Pres-Lam) frame systems under non-linear dynamic and static loading. From the conception of the post-tensioned jointed ductile concept it has been clear that the nature of its controlled rocking mechanism leant itself well to the use of a lumped plasticity approach. This approach combines the use of elastic elements with springs representing plastic rotations in the system. Two experimental testing campaigns have been used in order to confirm the effectiveness of this modelling technique in predicting both the global (frame) and local (beam-column) response of these systems. The first of these tests was a full scale beam-column joint tested quasi-statically and the second was a 3-dimensional, 3-storey, 2/3rd scale multi-storey post-tensioned timber frame building tested dynamically. During the testing programmes the specimens were tested both with and without the addition of dissipative steel angles which were designed to yield at a certain level of drift. These steel angles release energy through hysteresis during lateral frame movement thus increasing damping. Both structures were modelled using a lumped plasticity approach with springs that were calibrated against the moment rotation design procedure used for post-tensioned timber connections. This work has proved the adequacy of the use of two numerical modelling programs, RUAUMOKO and SAP2000, in providing accurate representation of structural response when calibrated against current design procedures. All testing was performed in the structural laboratory of the University of Basilicata in Potenza, Italy. This experimental campaign is part of a series of experimental tests in collaboration with the University of Canterbury, Christchurch, New Zealand.
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The Numerical Analysis and Experimental Verification on the Thermal Performance of Hybrid Cross-Laminated Timber (CLT)-Glass Facade Elements

https://research.thinkwood.com/en/permalink/catalogue2704
Year of Publication
2020
Topic
Energy Performance
Material
CLT (Cross-Laminated Timber)
Author
Rajcic, Vlatka
Bedon, Chiara
Barbalic, Jure
Perkovic, Nikola
Year of Publication
2020
Format
Conference Paper
Material
CLT (Cross-Laminated Timber)
Topic
Energy Performance
Keywords
Structural Glass
CLT-Structural Glass Hybrid Facade
Small-Scale Experiments
Finite Element Modelling
Numerical Modelling
Language
English
Conference
Challenging Glass Conference
Research Status
Complete
Summary
Structural solutions involving the mechanical interaction of timber and glass load-bearing members showed a progressive increase in the last decade. Among others, a multipurpose hybrid facade element composed of Cross-Laminated Timber (CLT) members and glass panels interacting by frictional contact mechanisms only was proposed ion the framework of the VETROLIGNUM project. While demonstrating enhanced load-bearing and deformation capacity performances under seismic loads, facade elements are known to represent a building component with multiple performance parameters to satisfy. These include energy efficiency, durability, lightening comfort and optimal thermal performance. In this paper, a special focus is dedicated to the thermal performance assessment of CLT-glass facade modules under ordinary operational conditions. Based on the thermal-chamber analysis of small-scale prototypes, reliable Finite Element numerical models are developed and applied to full-scale VETROLIGNUM solution. Sensitivity analyses are hence carried out to explore the actual thermal performance of these novel hybrid systems.
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Numerical Modelling of Timber Concrete Composite Structures in Fire - Guidance Document

https://research.thinkwood.com/en/permalink/catalogue2166
Year of Publication
2018
Topic
Fire
Design and Systems
Material
Timber-Concrete Composite
Glulam (Glue-Laminated Timber)
LVL (Laminated Veneer Lumber)
Application
Wood Building Systems
Beams

Post-Tensioned LVL Beams: Experimental Results and Numerical Modelling

https://research.thinkwood.com/en/permalink/catalogue1713
Year of Publication
2016
Topic
Serviceability
Mechanical Properties
Material
LVL (Laminated Veneer Lumber)
Application
Beams
Author
Granello, Gabriele
Giorgini, Simona
Palermo, Alessandro
Pampanin, Stefano
Year of Publication
2016
Country of Publication
Austria
Format
Conference Paper
Material
LVL (Laminated Veneer Lumber)
Application
Beams
Topic
Serviceability
Mechanical Properties
Keywords
Post-Tensioned
Monitoring
Creep
Deflection
Finite Element
Numerical Modelling
Language
English
Conference
World Conference on Timber Engineering
Research Status
Complete
Notes
August 22-25, 2016, Vienna, Austria p. 4520-4528
Summary
The benefits of longitudinally post-tensioning in timber beams has been highlighted in several laboratory tests carried out at the University of Canterbury. However, there is still some concern about the long-term behaviour of post-tensioned engineered wood, which relates in particular to the amount of possible post-tensioning loss due to creep...
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Predicting the Human-Induced Vibration of Cross Laminated Timber Floor Under Multi-Person Loadings

https://research.thinkwood.com/en/permalink/catalogue2701
Year of Publication
2021
Topic
Acoustics and Vibration
Material
CLT (Cross-Laminated Timber)
Application
Floors
Author
Wang, Chang
Chang, Wen-Shao
Yan, Weiming
Huang, Haoyu
Publisher
ScienceDirect
Year of Publication
2021
Format
Journal Article
Material
CLT (Cross-Laminated Timber)
Application
Floors
Topic
Acoustics and Vibration
Keywords
Human-Induced Vibration
Multi-Person Loadings
Numerical Modelling
Language
English
Research Status
Complete
Series
Structures
Summary
The vibration of cross laminated timber (CLT) floor is closely related to human-induced loadings. However, research and prediction approaches regarding human-induced vibration of the CLT floor have been mostly limited to a single-person excitation condition. This paper presents new prediction approaches to the vibration response of the CLT floor under multi-person loadings. The effect of multi-person loadings on the vibration performance of a CLT floor was investigated through numerical modelling, experimental testing and analytical investigation. A finite element model was developed through a computational software to perform an accurate analysis of human-induced loadings. An analytical model was established to predict human-induced vibration of the CLT floor under multi-person loadings. Experimental tests were conducted to validate the numerical modelling. Results of both numerical modelling and experimental testing showed that the vibration performance of the CLT floor under multi-person loadings was almost double that under single-person loadings. Thus, multi-person activities are more likely to cause the occupants feelings of discomfort. A method for predicting the human-induced vibration of the CLT floor under multi-person loadings was then developed. The measured response, numerical modelled response, and predicted response were compared using an existing design metric, vibration dose value (VDV). The results were largely consistent. It is therefore concluded that the proposed prediction method will enable engineers to design timber floor systems that consider multi-person loadings.
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A Survey on Modelling of Mass Timber Buildings

https://research.thinkwood.com/en/permalink/catalogue1916
Year of Publication
2017
Topic
Design and Systems
Application
Wood Building Systems
Author
Chen, Zhiyong
Karacabeyli, Erol
Lum, Conroy
Organization
FPInnovations
Year of Publication
2017
Country of Publication
Canada
Format
Report
Application
Wood Building Systems
Topic
Design and Systems
Keywords
Numerical Modelling
Research
Designers
Prediction
Software Tools
Empirical Equations
Design Challenges
Language
English
Research Status
Complete
Summary
A survey was conducted under the "Renessaince in Wood Construction" project that was funded by Natural Resources Canada (NRCan) under the Transformative Technologies Program to see information about numerical modelling on mass timber buildings. A questionnaire was sent to designers and researchers covering different performance attributes. The compiled information includes the available software packages and resources of empirical equations that are used by the designers and researchers for predicting the structural, fire, acoustic, and building envelope (energy and durability) performance of mass timber buildings, and the challenges that they are facing in using those tools. This report summarizes the input obtained from practicing designers and researchers who responded to this survey.
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10 records – page 1 of 1.