Skip header and navigation

2 records – page 1 of 1.

Long-Term Performance of Adhesively Bonded Timber-Concrete-Composites

https://research.thinkwood.com/en/permalink/catalogue390
Year of Publication
2014
Topic
Connections
Mechanical Properties
Serviceability
Material
Timber-Concrete Composite
Application
Beams
Author
Tannert, Thomas
Brunner, Maurice
Vallée, Till
Endacott, Bryn
Year of Publication
2014
Country of Publication
Canada
Format
Conference Paper
Material
Timber-Concrete Composite
Application
Beams
Topic
Connections
Mechanical Properties
Serviceability
Keywords
Adhesives
Long-term
Deflection
Environmental Conditions
Language
English
Conference
World Conference on Timber Engineering
Research Status
Complete
Notes
August 10-14, 2014, Quebec City, Canada
Summary
Timber-concrete-composite (TCC) floors are a successful example of hybrid structural components. TCC are composed of timber and concrete layers connected by a shear connector and are commonly used in practical civil engineering applications. The connection of the two components is usually achieved with mechanical fasteners where relative slip cannot be prevented and the connection cannot be considered rigid. More recently, an adhesively bonded TCC system has been proposed, and has been shown to perform predictably under static short-term loading. One of the main considerations when designing TCC floors is their long-term performance. In the research presented herein, two adhesively bonded TCC beams were exposed to serviceability loads for approximately 4.5 years. During this time the environmental conditions and the deflections were monitored. After having been loaded for 4.5 years, the beams were tested to failure, resulting in findings that long-term loading caused no degradation of the adhesive bond. This research provides input data to develop design guidance for adhesively bonded TCC under long-term loading.
Online Access
Free
Resource Link
Less detail

Wood-Based Beams Strengthened with FRP Laminates: Improved Performance with Pre-Stressed Systems

https://research.thinkwood.com/en/permalink/catalogue305
Year of Publication
2015
Topic
Design and Systems
Mechanical Properties
Material
Solid-sawn Heavy Timber
Author
Kliger, Robert
Haghani, Reza
Brunner, Maurice
Harte, Annette
Schober, Kay-Uwe
Organization
European Journal of Wood and Wood Products
Publisher
Springer Berlin Heidelberg
Year of Publication
2015
Country of Publication
Germany
Format
Journal Article
Material
Solid-sawn Heavy Timber
Topic
Design and Systems
Mechanical Properties
Keywords
Fibre-Reinforced Polymer
Pre-stressed
Bending
Reinforcement
Language
English
Research Status
Complete
Series
European Journal of Wood and Wood Products
ISSN
1436-736X
Summary
Using bonded fibre-reinforced polymer (FRP) laminates for strengthening wooden structural members has been shown to be an effective and economical method. In this paper, properties of suitable FRP materials, adhesives and two ways of strengthening beams exposed to bending moment are presented. Passive or slack reinforcement is one way of strengthening. The most effective way of such a strengthening was to place reinforcement laminates on both tension and compression side of the beam. However, the FRP material is only partially utilised. The second way is to apply pre-stressing in FRP materials prior to bonding to tension side of flexural members and this way was showed to provide the most effective utilisation of these materials. The state of the art of such a strengthening and various methods are discussed. Increasing the load-bearing capacity, introducing a pre-cambering effect and thus improving serviceability which often governs the design and reducing the amount of needed FRP reinforcement are some of the main advantages. A recent development on how to avoid the requirement for anchoring the laminates at the end of the beams to avoid premature debonding is shown and the advantage of such a system is described.
Online Access
Free
Resource Link
Less detail