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Connection Performance for LVL-Concrete Composite Floor System

https://research.thinkwood.com/en/permalink/catalogue292
Year of Publication
2015
Topic
Connections
Mechanical Properties
Material
LVL (Laminated Veneer Lumber)
Timber-Concrete Composite
Application
Floors
Author
Fong Lee, Yen
Abd. Ghafar, Nor
Abd. Rahman, Norashidah
Yeoh, David
Organization
International Integrated Engineering Summit (IIES)
Year of Publication
2015
Country of Publication
Malaysia
Format
Conference Paper
Material
LVL (Laminated Veneer Lumber)
Timber-Concrete Composite
Application
Floors
Topic
Connections
Mechanical Properties
Keywords
Push-Out
Notch Connections
Failure
Strength
Stiffness
Ultimate Limit States
Serviceability Limit States
Language
English
Conference
IIES 2014
Research Status
Complete
Notes
December 1-4, 2014, Johor, Malaysia
Summary
The LVL-concrete composite (LCC) structure is a hybrid in system which the LVL member is well connected to the concrete slab by a connector to produce composite action. Various types of connector with different stiffness and shear capacity are available in the market currently. The stiffness of the connector is identified through the push-out experiment. The notch connections for LVL concrete composite beams have higher stiffness and strength compared to mechanical fasteners. This paper discusses the experimental results of symmetrical push-out tests on 3 different types of connector, 150mm rectangular notch with 10mm diameter screw, 100mm rectangular notch with 8mm diameter screw and 100mm triangular notch with 8mm diameter screw. The experimental test was shear push out to failure and the type of failure was discussed. The 150mm rectangular notch was found to be strongest among all and low cost. The 100mm rectangular notch was found to be slightly stiffer than 100mm triangular notch but 100mm triangular notch is easier to construct with only 2 cut. The maximum strength and stiffness at ultimate limit states and serviceability limit states of each type of connection were discussed in this paper.
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Experimental Analysis of the Structural Behavior of Timber-Concrete Composite Slabs Made of Beech-Laminated Veneer Lumber

https://research.thinkwood.com/en/permalink/catalogue611
Year of Publication
2013
Topic
Connections
Mechanical Properties
Material
Timber-Concrete Composite
LVL (Laminated Veneer Lumber)
Application
Floors
Author
Boccadoro, Lorenzo
Frangi, Andrea
Publisher
American Society of Civil Engineers
Year of Publication
2013
Country of Publication
United States
Format
Journal Article
Material
Timber-Concrete Composite
LVL (Laminated Veneer Lumber)
Application
Floors
Topic
Connections
Mechanical Properties
Keywords
Beech
Spruce
Load Carrying Capacity
Structural Behavior
Failure Modes
Notch Connections
Language
English
Research Status
Complete
Series
Journal of Performance of Constructed Facilities
Summary
The wood engineering community has dedicated a significant amount of effort over the last decades to establish a reliable predictive model for the load-carrying capacity of timber connections under wood failure mechanisms. Test results from various sources (Foschi and Longworth 1975; Johnsson 2003; Quenneville and Mohammad 2000; Stahl et al. 2004; Zarnani and Quenneville 2012a) demonstrate that for multi-fastener connections, failure of wood can be the dominant mode. In existing wood strength prediction models for parallel to grain failure in timber connections using dowel-type fasteners, different methods consider the minimum, maximum or the summation of the tensile and shear capacities of the failed wood block planes. This results in disagreements between the experimental values and the predictions. It is postulated that these methods are not appropriate since the stiffness in the wood blocks adjacent to the tensile and shear planes differs and this leads to uneven load distribution amongst the resisting planes (Johnsson 2004; Zarnani and Quenneville 2012a). The present study focuses on the nailed connections. A closed-form analytical method to determine the load-carrying capacity of wood under parallel-to-grain loading in small dowel-type connections in timber products is thus proposed. The proposed stiffness-based model has already been verified in brittle and mixed failure modes of timber rivet connections (Zarnani and Quenneville 2013b).
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Free
Resource Link
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