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12 records – page 1 of 2.

Investigation and Optimization of Connections in Timber Assemblies Subjected to Blast Loading

https://research.thinkwood.com/en/permalink/catalogue2509
Year of Publication
2020
Topic
Design and Systems
Connections
Material
CLT (Cross-Laminated Timber)
Glulam (Glue-Laminated Timber)
Application
Wood Building Systems

Behaviour of Cross-Laminated Timber Subjected to Blast Loading

https://research.thinkwood.com/en/permalink/catalogue2451
Year of Publication
2019
Topic
Mechanical Properties
Material
CLT (Cross-Laminated Timber)
Author
Poulin, Mathieu
Organization
University of Ottawa
Year of Publication
2019
Country of Publication
Canada
Format
Thesis
Material
CLT (Cross-Laminated Timber)
Topic
Mechanical Properties
Keywords
Blast Loading
Language
English
Research Status
Complete
Online Access
Free
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Blast Testing of Loaded Mass Timber Structures

https://research.thinkwood.com/en/permalink/catalogue1164
Year of Publication
2018
Topic
Mechanical Properties
Material
CLT (Cross-Laminated Timber)
NLT (Nail-Laminated Timber)
Application
Walls

Blast Testing of Loaded Cross-Laminated Timber Structures

https://research.thinkwood.com/en/permalink/catalogue1234
Year of Publication
2018
Topic
Mechanical Properties
Design and Systems
Material
CLT (Cross-Laminated Timber)
Application
Wood Building Systems
Author
Weaver, Mark
Newberry, Charles
Podesto, Lisa
O’Laughlin, Casey
Organization
Structures Congress
Publisher
American Society of Civil Engineers
Year of Publication
2018
Country of Publication
United States
Format
Conference Paper
Material
CLT (Cross-Laminated Timber)
Application
Wood Building Systems
Topic
Mechanical Properties
Design and Systems
Keywords
Blast Tests
Airblast Loads
Axial Load
Panels
Load Distribution
Quasi-Static
Language
English
Conference
Structures Conference 2018
Research Status
Complete
Notes
April 19–21, 2018, Fort Worth, Texas
Summary
Results from a series of blast tests performed in October 2016 on three two-story, single-bay cross-laminated timber (CLT) structures demonstrated the ability of CLT construction to resist airblast loads in a predictable fashion. These tests were performed on structures without superimposed load to limit inertial resistance. Subsequently, a follow-on series of tests...
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Exploring Cross-Laminated Timber Use for Temporary Military Structures: Ballistic Considerations

https://research.thinkwood.com/en/permalink/catalogue2371
Year of Publication
2018
Topic
Design and Systems
Market and Adoption
Material
CLT (Cross-Laminated Timber)
Application
Wood Building Systems
Author
Sanborn, Kathryn
Publisher
Georgia Institute of Technology
Year of Publication
2018
Country of Publication
United States
Format
Thesis
Material
CLT (Cross-Laminated Timber)
Application
Wood Building Systems
Topic
Design and Systems
Market and Adoption
Keywords
Ballistic Resistance
Panels
Military Structures
Blast Analysis Tool
Spruce-Pine-Fir
Southern Pine
SPF
Language
English
Research Status
Complete
Summary
The design and construction of temporary military structures has changed little since World War II. While these structures are lightweight and rapidly deployable, they require a sizeable workforce to construct and provide minimal ballistic and blast protection for occupants. Cross-laminated timber (CLT) is a relatively new prefabricated engineered wood product that is strong, stiff, quick to build, and has the potential to offer inherent ballistic and blast resistance compared to traditional wood products. The orthotropic nature of CLT coupled with the energy absorbing capacity of the thick wood panels warrant further investigation into the viability of CLT for temporary military structures. To that end, the research presented in this thesis seeks to better understand the ballistic and blast response of CLT panels and to develop evaluation criteria for the use of CLT in temporary military structures. Specific areas of investigation included: 1) experimental testing of the ballistic resistance of CLT panels, conducting in conjunction with U.S. Army laboratories in Aberdeen Proving Grounds, Maryland and Vicksburg, Mississippi; 2) the design, prototyping, and experimental testing of enhanced CLT panels to further improve ballistic performance; 3) a qualitative analysis of CLT panels under ballistic impact resistance mechanisms; 4) the development of a CLT blast analysis tool to predict the elastic response of CLT to blast loadings; and 5) the development of a simplified tool to identify evaluation criteria for temporary military structure material selection, including conventional materials as well as CLT. Specimens in this research consisted of commercially produced Spruce-Pine-Fir CLT as well as Southern Pine CLT specimens fabricated specifically for this research. Ballistic testing of both types of conventional CLT indicate that the material’s inherent penetration resistance is significantly greater than that of dimension lumber and plywood used in current common temporary military structures. The testing shows that current U.S. military design guidelines (UFC 4-023-07), used for determining required wood thickness based on ballistic threat, under predicts the ballistic performance of CLT. From testing and analysis, the thesis develops updated equations for predicting the thickness of CLT required for ballistic protection. A qualitative analysis of ballistic specimens identified local failure modes in the CLT and links the observed damage the anisotropic material properties, grading, and defects in sawn timbers. Enhanced CLT specimens were fabricated using various hardening materials including thin metal plates and gratings, polymer-based armors, and fiber-reinforced epoxy matrix panels. The enhanced CLTs were evaluated based on ease of production, ballistic resistance as compared to conventional CLT, and cost-benefit analysis. The shear analogy method was incorporated into a single-degree-of-freedom blast analysis to predict the response of different types and sizes of CLT panels under blast loads within the elastic regime. The tool was validated using field data from low-level live blast tests and showed good agreement with the field data. Finally, tailored evaluation criteria for comparative assessment of construction materials for use in temporary military structures – considering issues of cost, the logistics of in-theater deployment, energy consumption and force protection were developed and applied through using the AHP decision-making process.
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Effect of Realistic Boundary Conditions on the Behaviour of Cross-Laminated Timber Elements Subjected to Simulated Blast Loads

https://research.thinkwood.com/en/permalink/catalogue2361
Year of Publication
2017
Topic
Seismic
Material
CLT (Cross-Laminated Timber)
Application
Floors
Walls
Author
Cote, Dominic
Publisher
University of Ottawa
Year of Publication
2017
Country of Publication
Canada
Format
Thesis
Material
CLT (Cross-Laminated Timber)
Application
Floors
Walls
Topic
Seismic
Keywords
Connections
Seismic Load
Blast Loads
Fasteners
Language
English
Research Status
Complete
Summary
Cross-laminated timber (CLT) is an emerging engineered wood product in North America. Past research effort to establish the behaviour of CLT under extreme loading conditions has focussed CLT slabs with idealized simply-supported boundary conditions. Connections between the wall and the floor systems above and below are critical to fully describing the overall behaviour of CLT structures when subjected to blast loads. The current study investigates the effects of “realistic” boundary conditions on the behaviour of cross-laminated timber walls when subjected to simulated out-of-plane blast loads. The methodology followed in the current research consists of experimental and analytical components. The experimental component was conducted in the Blast Research Laboratory at the University of Ottawa, where shock waves were applied to the specimens. Configurations with seismic detailing were considered, in order to evaluate whether existing structures that have adequate capacities to resist high seismic loads would also be capable of resisting a blast load with reasonable damage. In addition, typical connections used in construction to resist gravity and lateral loads, as well as connections designed specifically to resist a given blast load were investigated. The results indicate that the detailing of the connections appears to significantly affect the behaviour of the CLT slab. Typical detailing for platform construction where long screws connect the floor slab to the wall in end grain performed poorly and experienced brittle failure through splitting in the perpendicular to grain direction in the CLT. Bearing type connections generally behaved well and yielding in the fasteners and/or angles brackets meant that a significant portion of the energy was dissipated there reducing the energy imparted on the CLT slab significantly. Hence less displacement and thereby damage was observed in the slab. The study also concluded that using simplified tools such as single-degree-of-freedom (SDOF) models together with current available material models for CLT is not sufficient to adequately describe the behaviour and estimate the damage. More testing and development of models with higher fidelity are required in order to develop robust tools for the design of CLT element subjected to blast loading.
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Behaviour of Glued-Laminated (Glulam) Beams and Columns Subjected to Simulated Blast Loads

https://research.thinkwood.com/en/permalink/catalogue1549
Year of Publication
2016
Topic
Mechanical Properties
Material
Glulam (Glue-Laminated Timber)
Application
Beams
Columns
Author
Lacroix, Daniel
Doudak, Ghasan
Year of Publication
2016
Country of Publication
Austria
Format
Conference Paper
Material
Glulam (Glue-Laminated Timber)
Application
Beams
Columns
Topic
Mechanical Properties
Keywords
Blast Loads
Static Loads
Dynamic Loads
Dynamic Tests
Language
English
Conference
World Conference on Timber Engineering
Research Status
Complete
Notes
August 22-25, 2016, Vienna, Austria p. 1199-1206
Summary
This paper presents preliminary results from an experimental program investigating the dynamic behaviour of glulam beams and columns subjected to simulated blast loads. A total of eight glulam beams and columns were tested destructively under static and dynamic loads...
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Behaviour of FRP Retrofitted Glued-Laminated (Glulam) Beams Subjected to Simulated Blast Loads

https://research.thinkwood.com/en/permalink/catalogue1550
Year of Publication
2016
Topic
Mechanical Properties
Material
Glulam (Glue-Laminated Timber)
Application
Beams
Author
Lacroix, Daniel
Doudak, Ghasan
Year of Publication
2016
Country of Publication
Austria
Format
Conference Paper
Material
Glulam (Glue-Laminated Timber)
Application
Beams
Topic
Mechanical Properties
Keywords
Retrofitted
Static Loads
Dynamic Loads
GFRP
Damage
Predictive Model
Language
English
Conference
World Conference on Timber Engineering
Research Status
Complete
Notes
August 22-25, 2016, Vienna, Austria p. 1207-1214
Summary
Preliminary results from an experimental program investigating the behaviour of retrofitted glulam beams subjected to static and dynamic loads are presented in this paper. The effect of glass fibre-reinforced-polymer (GFRP) laminates applied on the tension side was investigated under both static and dynamic loading as a potential retrofit on...
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Free
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Flexural Response of Glued Laminated (Glulam) Beams Subjected to Blast Loads

https://research.thinkwood.com/en/permalink/catalogue492
Year of Publication
2014
Topic
Mechanical Properties
Material
Glulam (Glue-Laminated Timber)
Application
Beams
Author
Lacroix, Daniel
Viau, Christian
Doudak, Ghasan
Year of Publication
2014
Country of Publication
Canada
Format
Conference Paper
Material
Glulam (Glue-Laminated Timber)
Application
Beams
Topic
Mechanical Properties
Keywords
Strain
Flexural Behaviour
Blast Loads
Language
English
Conference
World Conference on Timber Engineering
Research Status
Complete
Notes
August 10-14, 2014, Quebec City, Canada
Summary
An extensive body of research is currently available on the behaviour of concrete and steel structures when subjected to blast threats, however, little to no details on how to address the design or retrofitting of wood structures are available. In this p...
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Free
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Blast-Resistant Testing for Loaded Mass Timber Structures

https://research.thinkwood.com/en/permalink/catalogue843
Topic
Mechanical Properties
Material
CLT (Cross-Laminated Timber)
Application
Walls
Organization
Forest Products Laboratory
Country of Publication
United States
Format
Report
Material
CLT (Cross-Laminated Timber)
Application
Walls
Topic
Mechanical Properties
Keywords
Exterior Walls
Blast Loads
Protection
Research Status
In Progress
Summary
The objectives of this project are to develop a design methodology and to demonstrate performance for exterior bearing CLT walls used in buildings subject to force protection requirements. This methodology should be published by U.S. Army Corp of Enginee...
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12 records – page 1 of 2.