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42 records – page 1 of 5.

Design Concept for a Greened Timber Truss Bridge in City Area

https://research.thinkwood.com/en/permalink/catalogue2392
Year of Publication
2020
Topic
Design and Systems
Environmental Impact
Material
Timber (unspecified)
Application
Bridges and Spans
Author
Kromoser, Benjamin
Ritt, Martin
Spitzer, Alexandra
Stangl, Rosemarie
Idam, Friedrich
Publisher
MDPI
Year of Publication
2020
Format
Journal Article
Material
Timber (unspecified)
Application
Bridges and Spans
Topic
Design and Systems
Environmental Impact
Keywords
Wooden Trusses
Timber Bridges
Timber Engineering
Greened Structures
Vertical Green
Sustainable Structural Engineering
Digital Design
Parametric Design
Automated Construction
Resource-Efficient Structural Engineering
Language
English
Research Status
Complete
Series
Sustainability
Summary
Properly designed wooden truss bridges are environmentally compatible construction systems. The sharp decline in the erection of such structures in the past decades can be led back to the great effort needed for design and production. Digital parametric design and automated prefabrication approaches allow for a substantial improvement of the efficiency of design and manufacturing processes. Thus, if combined with a constructive wood protection following traditional building techniques, highly efficient sustainable structures are the result. The present paper describes the conceptual design for a wooden truss bridge drawn up for the overpass of a two-lane street crossing the university campus of one of Vienna’s main universities. The concept includes the greening of the structure as a shading design element. After an introduction, two Austrian traditional wooden bridges representing a good and a bad example for constructive wood protection are presented, and a state of the art of the production of timber trusses and greening building structures is given as well. The third part consists of the explanation of the boundary conditions for the project. Subsequently, in the fourth part, the conceptual design, including the design concept, the digital parametric design, the optimization, and the automated prefabrication concept, as well as the potential greening concept are discussed, followed by a summary and outlook on future research.
Online Access
Free
Resource Link
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Environmental and Economic Evaluation of Small-Scale Bridge Repair Using Cross-Laminated Timber Floor Slabs

https://research.thinkwood.com/en/permalink/catalogue2397
Year of Publication
2020
Topic
Design and Systems
Environmental Impact
Material
CLT (Cross-Laminated Timber)
Application
Bridges and Spans

Bending Capacity of Orthogonal and Parallel Glulam T-section Beams

https://research.thinkwood.com/en/permalink/catalogue2476
Year of Publication
2020
Topic
Mechanical Properties
Material
Glulam (Glue-Laminated Timber)
Application
Beams
Bridges and Spans
Author
Wang, Jiejun
Yang, Tao
Ning, Fan
Rao, Zhenyu
Publisher
Eastern Macedonia and Thrace Institute of Technology (EMaTTech)
Year of Publication
2020
Country of Publication
Greece
Format
Journal Article
Material
Glulam (Glue-Laminated Timber)
Application
Beams
Bridges and Spans
Topic
Mechanical Properties
Keywords
Bearing Capacity
Stiffness
Integrity
Strain
Deflection
Ultimate Bearing Capacity
Shear Strength
Finite Element Model
Displacement
Failure Mechanism
Ductility
Language
English
Research Status
Complete
Series
Journal of Engineering Science and Technology Review
ISSN
1791-2377
Online Access
Free
Resource Link
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Petawawa Research Forest Centennial Bridge

https://research.thinkwood.com/en/permalink/catalogue1919
Year of Publication
2019
Topic
Design and Systems
Material
Timber (unspecified)
Application
Bridges and Spans
Author
Koo, Kenneth
Prevost, Glen
Pineau, John
Organization
FPInnovations
Year of Publication
2019
Country of Publication
Canada
Format
Report
Material
Timber (unspecified)
Application
Bridges and Spans
Topic
Design and Systems
Keywords
Road Bridge
Construction
Culvert System
Engineered Wood Product (EWP)
Language
English
Research Status
Complete
Summary
The Petawawa Research Forest (PRF) was established in 1918 and is the oldest research forest in Canada. It is located along Highway 17, east of Chalk River, Ontario, and is part of Garrison Petawawa under the jurisdiction of the Department of National Defence. By special agreement, it is managed by the Canadian Wood Fibre Centre, under the Canadian Forest Service, Natural Resources Canada. The research undertaken at the PRF influences forest policy, industry, silvicultural practices, and private forest management practices across the country. Operational commercial harvests also occur at the PRF. Meridian Road is an access road at the PRF and leads to research, forest management, and recreational sites. A multi-cell culvert system at Young’s Creek recently failed (bottom left), and the crossing needed large-scale maintenance to allow the continued movement of logging trucks, vehicles, and research teams. The culvert failure negatively impacted water flow and habitat. To rectify these issues, a modern, single-lane engineered wood product (EWP) bridge, named Centennial Bridge (bottom right), was installed and built by Corington Engineering Inc., of Renfrew, Ontario. The experience at the PRF is of interest to sustainable forest licence (SFL) holders (and municipalities) looking to gain more knowledge about the construction and design of EWP access road bridges. The goal of this case study was to highlight the main construction and design details of Centennial Bridge and draw some comparisons to conventional steel-logging road bridges.
Online Access
Free
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Research Needs Assessment for the Mass Timber Industry: Proceedings of the 2nd North American Mass Timber Research Needs Workshop

https://research.thinkwood.com/en/permalink/catalogue2164
Year of Publication
2019
Topic
General Information
Material
CLT (Cross-Laminated Timber)
DLT (Dowel Laminated Timber)
NLT (Nail-Laminated Timber)
Glulam (Glue-Laminated Timber)
Timber-Concrete Composite
Application
General Application
Shear Walls
Walls
Wood Building Systems
Floors
Columns
Bridges and Spans

Development of a Smart Timber Bridge (Phase III): Moisture and Strain Sensor Investigation for Historic Covered Bridges

https://research.thinkwood.com/en/permalink/catalogue2182
Year of Publication
2019
Topic
Moisture
Material
Glulam (Glue-Laminated Timber)
Other Materials
Application
Bridges and Spans
Author
Phares, Brent
Pence, Trevor
Wacker, James
Hosteng, Travis
Year of Publication
2019
Country of Publication
United States
Format
Report
Material
Glulam (Glue-Laminated Timber)
Other Materials
Application
Bridges and Spans
Topic
Moisture
Keywords
Moisture Content
Sensor
Strain
Reliability
Accuracy
Language
English
Research Status
Complete
Series
General Technical Report
Summary
Nationwide, bridges are deteriorating at a rate faster than they can be rehabilitated and maintained. This has resulted in a search for new methods to rehabilitate, repair, manage, and construct bridges. As a result, structural health monitoring and smart structure concepts have emerged to help improve bridge management. In the case of timber bridges, however, a limited amount of research as been conducted on long-term structural health monitoring solutions, and this is especially true in regards to historic covered timber bridges. To date, evaluation efforts of timber bridges have focused primarily on visual inspection data to determine the structural integrity of timber structures. To fill this research need and help improve timber bridge inspection and management strategies, a 5-year research plan to develop a smart timber bridge structure was undertaken. The overall goal of the 5-year plan was to develop a turnkey system to analyze, monitor, and report on the performance and condition of timber bridges. This report outlines one phase of the 5-year research plan and focuses on developing and attaching moisture sensors onto timber bridge components. The goal was to investigate the potential for sensor technologies to reliably monitor the in situ moisture content of the timber members in historic covered bridges, especially those recently rehabilitated with glulam materials. The timber-specific moisture sensors detailed in this report and the data collected from them will assist in advancing the smart timber bridge.
Online Access
Free
Resource Link
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Innovative Strategies to Protect Concrete Bridge Decks and Cross-Laminated Timber Structures through the Use of Impermeable Overlays

https://research.thinkwood.com/en/permalink/catalogue2281
Year of Publication
2019
Topic
Moisture
Design and Systems
Material
CLT (Cross-Laminated Timber)
Application
Bridges and Spans
Floors

Modular Timber Concrete Composite System for Short Span Highway Bridges

https://research.thinkwood.com/en/permalink/catalogue2297
Year of Publication
2019
Topic
Design and Systems
Connections
Material
Timber-Concrete Composite
Glulam (Glue-Laminated Timber)
Application
Bridges and Spans
Author
Liang, Yi
Publisher
University of Toronto
Year of Publication
2019
Country of Publication
Canada
Format
Thesis
Material
Timber-Concrete Composite
Glulam (Glue-Laminated Timber)
Application
Bridges and Spans
Topic
Design and Systems
Connections
Keywords
Modular Construction
Ultra-High Performance Fibre Reinforced Concrete (UHPFRC)
Self-Tapping Screws
Canadian Highway Bridge Design Code
Language
English
Research Status
Complete
Summary
An innovative concept for a modular timber concrete composite system for short span highway bridges has been designed and key components experimentally validated. The proposed system consists of a Ultra-High Performance Fibre Reinforced Concrete(UHPFRC) deck and glue-laminated timer (glulam) girders linked to act compositely together by reinforcing steel bar shear connectors. This composite system has light, stable modules that can be rapidly constructed on site with less special equipment. Simple design checks indicate that the concept satisfies all serviceability limit state(SLS) and ultimate limit state(ULS) requirements of the Canadian Highway Bridge Design Code. Pull-out tests characterized the embedment lengths of 20M steel bar connectors to be 10 bar-diameters in UHPFRC. Push-off tests determined the embedment lengths of the same bars to be 30 bar-diameters glued into the timber girders. The slip modulus of the connectors is determined to be 67 kN/mm. The stiffness of the crosswise self-tapping screw connectors were tested and found to be structurally insignificant in this application. The excellent tensile and cracking properties of the reinforced UHPFRC deck was experimentally verified. A small amount of reinforcement would further improve the ductility of the UPHFRC deck system.
Online Access
Free
Resource Link
Less detail

Evaluation of Bending Performance of Nail Laminated and Dowel Laminated Timber

https://research.thinkwood.com/en/permalink/catalogue2309
Year of Publication
2019
Topic
Design and Systems
Mechanical Properties
Material
NLT (Nail-Laminated Timber)
DLT (Dowel Laminated Timber)
Application
Floors
Walls
Roofs
Bridges and Spans
Wood Building Systems
General Application

Identifying Incipient Decay in Douglas-fir Bridge Components using X-Ray Computerized Tomography

https://research.thinkwood.com/en/permalink/catalogue2350
Year of Publication
2019
Topic
Design and Systems
Moisture
Serviceability
Material
Glulam (Glue-Laminated Timber)
Solid-sawn Heavy Timber
Application
Bridges and Spans
Author
Senalik, Christopher
Wacker, James
Wang, Xiping
Wu, Xi
Year of Publication
2019
Country of Publication
United States
Format
Conference Paper
Material
Glulam (Glue-Laminated Timber)
Solid-sawn Heavy Timber
Application
Bridges and Spans
Topic
Design and Systems
Moisture
Serviceability
Keywords
X-ray Computerized Tomography
Wood Timber
Brown Rot Fungus
Incipient Decay
Language
English
Conference
International Nondestructive Testing and Evaluation of Wood Symposium
Research Status
Complete
Summary
In this report, wooden members of sizes typically used in bridge construction are examined using x-ray computerized tomography (CT) to determine the presence of internal decay. This report is part of an overall study in which Douglas-fir (Pseudotsuga menziesii) glue-laminated (glulam) beams and solid sawn timbers were inoculated with brown rot fungus, Fomitopsis pinicola, and exposed to aboveground conditions approximately 25 miles (40 km) north of Gulfport, Mississippi, USA. The goal of the overall study is to develop interior decay within the test specimens and then identify and characterize the decay using a variety of nondestructive testing (NDT) techniques. One NDT technique used is x-ray CT. The pixel brightness (PB) of CT scan images is proportional to the specific gravity (SG) at that location; high SG materials appear brighter whereas low SG materials appear darker. The consumption of wood by fungus decreases the wood SG; however, fungal progression takes place in areas where sufficient moisture is present. The presence of moisture increases wood SG as detected by the CT scan, which masks the effect of the fungal decay, which is a common co-occurrence with many NDT techniques. To identify incipient decay, it is necessary to examine the ring structure both within and outside of the area of moisture. Quantifying the extent of the decay requires correlating the PB to known SG values for both dry wood and wood of varying moisture content. In this report, the relationship between wood SG, moisture content, and PB was quantified.
Online Access
Free
Resource Link
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42 records – page 1 of 5.