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6 records – page 1 of 1.

Experimental and Numerical Analyses of New Massive Wooden Shear-Wall Systems

https://research.thinkwood.com/en/permalink/catalogue93
Year of Publication
2014
Topic
Seismic
Material
CLT (Cross-Laminated Timber)
Application
Shear Walls
Author
Pozza, Luca
Scotta, Roberto
Trutalli, Davide
Pinna, Mario
Polastri, Andrea
Bertoni, Paolo
Publisher
MDPI
Year of Publication
2014
Country of Publication
Switzerland
Format
Journal Article
Material
CLT (Cross-Laminated Timber)
Application
Shear Walls
Topic
Seismic
Keywords
Quasi-Static
Cyclic Loading Tests
Numerical model
Ductility
Eurocode 8
Behaviour Factor
Dissipative Capacity
Language
English
Research Status
Complete
Series
Buildings
ISSN
2075-5309
Summary
Three innovative massive wooden shear-wall systems (Cross-Laminated-Glued Wall, Cross-Laminated-Stapled Wall, Layered Wall with dovetail inserts) were tested and their structural behaviour under seismic action was assessed with numerical simulations. The wall specimens differ mainly in the method used to assemble the layers of timber boards composing them. Quasi-static cyclic loading tests were carried out and then reproduced with a non-linear numerical model calibrated on the test results to estimate the most appropriate behaviour factor for each system. Non-linear dynamic simulations of 15 artificially generated seismic shocks showed that these systems have good dissipative capacity when correctly designed and that they can be assigned to the medium ductility class of Eurocode 8. This work also shows the influence of deformations in wooden panels and base connectors on the behaviour factor and dissipative capacity of the system.
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Fire Performance of Timber Beam-to-Column Connections

https://research.thinkwood.com/en/permalink/catalogue2788
Topic
Connections
Fire
Application
Wood Building Systems
Organization
TallWood Design Institute
Oregon State University
Country of Publication
United States
Application
Wood Building Systems
Topic
Connections
Fire
Keywords
Moment Frame Connection
Moment Resisting Joints
Post-earthquake Fire
Fire Loads
Monotonic Loading Tests
Cyclic Loading Tests
Displacement
Research Status
In Progress
Summary
The goals of this research are to gain a better understanding of the mechanics of timber moment-frame connections during two different fire scenarios: fire and post-earthquake fire. This research will develop the testing methodologies and benchmark data required to develop designs for the fire and post-earthquake performance of timber moment-resisting frame connections. The project wIll test two moment resisting frame connections under fire and post-earthquake fire loading scenarios. Full scale monotonic and cyclic loading tests on sub-assemblies for both connection types at the Emmerson lab. Fire testing of structurally tested and un-tested specimens at the National Research Council (NRC) of Canada. These tests will occur under service loading conditions and will measure temperature gradients through the cross section of the connection, as well as displacements between the beam and column and residual cross section dimensions. Data will be used to benchmark numerical models in order to perfom a parametric study that allows for varying of geometric parameters such as connection geometry and fastener configurations.
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Investigation into the Hysteretic Performance of Self-Centering Timber Beam-to-Column Joints

https://research.thinkwood.com/en/permalink/catalogue1562
Year of Publication
2016
Material
Glulam (Glue-Laminated Timber)
Author
Wang, Kangli
Li, Zheng
He, Minjuan
Year of Publication
2016
Country of Publication
Austria
Format
Conference Paper
Material
Glulam (Glue-Laminated Timber)
Keywords
China
Post-Tensioned
Self-Centering
Energy Dissipation
Joint
Cyclic Loading Tests
Hysteretic Behaviour
Moment-Resisting Capacity
Failure Mechanism
Language
English
Conference
World Conference on Timber Engineering
Research Status
Complete
Notes
August 22-25, 2016, Vienna, Austria p. 1540-1547
Summary
The seismic performance of a post-tensioned (PT) energy dissipating beam-to-column joint for glulam heavy timber structure is investigated in this paper. Such connection incorporates post-tensioned high-strength strand to provide self-centering capacity along with energy dissipating produced by a special steel cap, which is attached with the timber beam and also to prevent the end bearing failure of wood. The moment-rotation behaviour of the proposed posttensioned timber joint was investigated through a series of cyclic loading tests. The timber joint was loaded at the end of the beams to produce a moment at the joint, and the tests were conducted with three different post-tension forces in the steel strand. The hysteretic behaviour and self-centering capacity of the joint are evaluated based on the results from cyclic loading tests. The failure mechanism of the joint was illustrated through test observations, and the momentresisting capacity and energy dissipation of the joint were analysed with regard to various drift level. This research aims to provide possible solutions to minimize the residual deformation of heavy timber structure made of glulam in China.
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Numerical Analysis of Self-Centring Cross-Laminated Timber Walls

https://research.thinkwood.com/en/permalink/catalogue2714
Year of Publication
2020
Topic
Design and Systems
Mechanical Properties
Seismic
Material
CLT (Cross-Laminated Timber)
Application
Walls
Author
Slotboom, Christian
Publisher
University of British Columbia
Year of Publication
2020
Format
Thesis
Material
CLT (Cross-Laminated Timber)
Application
Walls
Topic
Design and Systems
Mechanical Properties
Seismic
Keywords
Self-Centring
Model
Finite Element Model
Lumped Plasticity Elements
Fibre-Based Elements
Monotonic Loading Tests
Cyclic Loading Tests
Language
English
Research Status
Complete
Summary
Self-centring Cross-Laminated Timber (CLT) walls are a low damage seismic force resisting system, which can be used to construct tall wood buildings. This study examines two approaches to model self-centring CLT walls, one that uses lumped plasticity elements, and another that uses fibre-based elements. Finite element models of self-centring CLT walls are developed using the Python interpreter of Opensees, OpenSeesPy, and tested under monotonic and reverse cyclic loading conditions. Outputs from the analysis are compared with data from two existing experimental programs. Both models accurately predict the force displacement relationship of the wall in monotonic loading. For reverse cyclic loading, the lumped plasticity model could not capture cyclic deterioration due to crushing of CLT. Both models slightly overpredict the post-tension force. Sensitivity analyses were run on the fibre model, which show the wall studied is not sensitive to the shear stiffness of CLT. OpenSeesPy models are also created of a two-story structure, which is tested dynamically under a suite of ground motions. The structure is based on a building tested as part of the NHERI TallWood initiative. During testing the foundation of the building was found to be inadvertently flexible. To determine the appropriate model parameters for this foundation, calibrations were performed by running a sequence of OpenSeesPy analyses with an optimization algorithm. Outputs from the lumped plasticity and fibre models were compared to experimental results, which showed that both could capture the global behaviour of the system with reasonable accuracy. Both models overpredict peak post-tension forces. The suite of analyses is then run again on the building to predict the performance with a rigid foundation. Cyclic deterioration is more significant for the building with a rigid foundation, and as a result the fibre mode is more accurate.
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Free
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Seismic Design Approach for MTP Balloon Construction - Connection Properties

https://research.thinkwood.com/en/permalink/catalogue2648
Topic
Mechanical Properties
Connections
Author
Niederwestberg, Jan
Organization
University of Alberta
Country of Publication
Canada
Topic
Mechanical Properties
Connections
Keywords
Strength
Stiffness
Ductility
Energy Dissipation
Failure Mode
Steel Plates
Monotonic Loading Tests
Cyclic Loading Tests
Research Status
In Progress
Summary
The objective of this research is to characterize of load-deformation responses of tested connections(stiffness, strength, ductility, energy dissipation, failure modes) by testing large STS connections with steel side plates under monotonic and cyclic loads.
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Towards Resilient Mass Timber Systems: Understanding Durability of Cross-Laminated Timber Connections

https://research.thinkwood.com/en/permalink/catalogue2293
Topic
Connections
Material
CLT (Cross-Laminated Timber)
Organization
Oregon State University
Portland State University
Country of Publication
United States
Material
CLT (Cross-Laminated Timber)
Topic
Connections
Keywords
Durability
Mass Timber
Moisture
Ultrasonic
Cyclic Loading Tests
Research Status
In Progress
Notes
Project contact is Arijit Sinha.
Summary
Cross Laminated Timber (CLT) is gaining acceptance in tall building applications in the US. However, there are knowledge gaps concerning long-term performance, particularly effects due to moisture intrusion and biological decay in relation to connection systems. In a risk-averse industry, this knowledge gap impedes acceptance of CLT. The overall goal of the project is to characterize the effects of moisture accumulation in mass timber buildings on properties of building components and connections. The project will assess CLT connectors using small-scale assemblies, then use these data to develop predictive models that will be compared with full-scale tests. Connection assemblies will be constructed with two wood species and exposed to five moisture/biological regimes. Moisture behavior in the assemblies will be characterized using a combination of non-destructive tools, such as ultrasonic, wave propagation, CAT-Scan, and infrared imaging. The data generated from cyclic loading tests will be used to calibrate the SAWS connection model. This will provide a novel way to estimate the effects of moisture and biological degradation on connections. A deliverable for this project is a design guideline for engineers to account for the effects of moisture intrusion and subsequent fungal decay on panel and connection properties.
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6 records – page 1 of 1.