Skip header and navigation

9 records – page 1 of 1.

Design of Post-Tensioned Timber Beams for Fire Resistance

https://research.thinkwood.com/en/permalink/catalogue4
Year of Publication
2012
Topic
Design and Systems
Fire
Material
LVL (Laminated Veneer Lumber)
Application
Beams
Author
Buchanan, Andrew
Abu, Anthony
Carradine, David
Moss, Peter
Spellman, Phillip
Year of Publication
2012
Country of Publication
Switzerland
Format
Conference Paper
Material
LVL (Laminated Veneer Lumber)
Application
Beams
Topic
Design and Systems
Fire
Keywords
Full Scale
Furnace Tests
Post-Tensioned
Box Beams
Vertical Loads
Failure
Language
English
Conference
International Conference on Structures in Fire
Research Status
Complete
Notes
June 6-8, 2012, Zurich, Switzerland
Summary
This paper describes a series of three full-scale furnace tests on post-tensioned LVL box beams loaded with vertical loads, and presents a proposed fire design method for post-tensioned timber members. The design method is adapted from the calculation methods given in Eurocode 5 and NZS:3603 which includes the effects of changing geometry and several failure mechanisms specific to posttensioned timber. The design procedures include an estimation of the heating of the tendons within the timber cavities, and relaxation of post-tensioning forces. Additionally, comparisons of the designs and assumptions used in the proposed fire design method and the results of the full-scale furnace tests are made. The experimental investigation and development of a design method have shown several areas which need to be addressed. It is important to calculate shear stresses in the timber section, as shear is much more likely to govern compared to solid timber. The investigation has shown that whilst tensile failures are less likely to govern the fire design of post-tensioned timber members, due to the axial compression of the post-tensioning, tensile stresses must still be calculated due to the changing centroid of the members as the fire progresses. Research has also highlighted the importance of monitoring additional deflections and moments caused by the high level of axial loads.
Online Access
Free
Resource Link
Less detail

Dynamic Testing of Multi-Storey Post-Tensioned Glulam Building: Planning, Design and Numerical Analysis

https://research.thinkwood.com/en/permalink/catalogue634
Year of Publication
2012
Topic
Design and Systems
Material
Glulam (Glue-Laminated Timber)
Application
Wood Building Systems
Author
Smith, Tobias
Pampanin, Stefano
Carradine, David
Di Cesare, Antonio
Carlo Ponzo, Felice
Auletta, Gianluca
Nigro, Domenico
Simonetti, Michele
Mossucca, Antonello
Year of Publication
2012
Country of Publication
Portugal
Format
Conference Paper
Material
Glulam (Glue-Laminated Timber)
Application
Wood Building Systems
Topic
Design and Systems
Keywords
Post-Tensioned
Dissipative Steel Angles
Dynamic Testing
Damping Ratio
Language
English
Conference
World Conference on Earthquake Engineering
Research Status
Complete
Notes
September 24-28, 2012, Lisbon, Portugal
Summary
The following paper describes the first stage of dynamic testing of a post-tensioned timber building to be performed in the structural laboratory of the University of Basilicata in Potenza, Italy as part of a series of experimental tests in collaboration with the University of Canterbury in Christchurch, New Zealand. During this stage of testing a 3-dimensional, 3-storey post-tensioned timber structure will be tested. The specimen is 2/3rd scale and made up of frames in both directions composed of post-tensioned timber. The specimen will be tested both with and without the addition of dissipative steel angles which are designed to yield at a certain level drift. These steel angles release energy through hysteresis during movement thus increasing damping. The following paper discusses the testing set-up and preliminary numerical predictions of the system performance. Focus will be placed on damping ratios, displacements and accelerations.
Online Access
Free
Resource Link
Less detail

Experimental Investigations of Post-Tensioned Timber Frames with Advanced Seismic Damping Systems

https://research.thinkwood.com/en/permalink/catalogue464
Year of Publication
2012
Topic
Mechanical Properties
Seismic
Material
Glulam (Glue-Laminated Timber)
LVL (Laminated Veneer Lumber)
Application
Wood Building Systems
Author
Smith, Tobias
Carradine, David
Di Cesare, Antonio
Carlo Ponzo, Felice
Pampanin, Stefano
Buchanan, Andrew
Nigro, Domenico
Organization
Structures Congress
Publisher
American Society of Civil Engineers
Year of Publication
2012
Country of Publication
United States
Format
Conference Paper
Material
Glulam (Glue-Laminated Timber)
LVL (Laminated Veneer Lumber)
Application
Wood Building Systems
Topic
Mechanical Properties
Seismic
Keywords
Damping
Energy Dissipation
Full Scale
Post-Tensioning
Language
English
Conference
Structures Congress 2012
Research Status
Complete
Notes
March 29-31, 2012, Chicago, Illinois, United States
Summary
This paper describes initial experimental testing to investigate feasible sources of passive damping for the seismic design of post-tensioned glue laminated timber structures. These innovative high performance structural systems extend precast concrete PRESSS technology to engineered wood structures, combining the use of post-tensioning bars or cables with large post-tensioned timber members. The combination of these two elements provides elastic recentering to the structure while the addition of damping using a specialised energy dissipation system gives the desirable `flag shaped' hysteretic response under lateral loading. Testing has been performed on a full scale beam-column joint at the University of Basilicata in Italy in a collaborative project with the University of Canterbury, New Zealand. The experimental testing uses engineered wood products, extending the use of laminated veneer lumber (LVL) structures tested in New Zealand to testing of glue laminated timber (glulam) structures in Italy. Current testing is aimed at further improvement of the system through additional energy dissipation systems.
Online Access
Payment Required
Resource Link
Less detail

Full-Scale Fire Tests of Post-Tensioned Timber Beams

https://research.thinkwood.com/en/permalink/catalogue257
Year of Publication
2012
Topic
Fire
Material
LVL (Laminated Veneer Lumber)
Application
Beams
Author
Spellman, Phillip
Carradine, David
Abu, Anthony
Moss, Peter
Buchanan, Andrew
Year of Publication
2012
Country of Publication
New Zealand
Format
Conference Paper
Material
LVL (Laminated Veneer Lumber)
Application
Beams
Topic
Fire
Keywords
Failure Mechanisms
Steel Anchorage
Full Scale
Furnace Tests
Post-Tensioned
Language
English
Conference
World Conference on Timber Engineering
Research Status
Complete
Notes
July 15-19, 2012, Auckland, New Zealand
Summary
: This paper describes a series of full-scale furnace tests on loaded post tensioned LVL beams. Each beam was designed to exhibit a specific failure mechanism when exposed to the standard ISO834 fire. In addition to the beams a number of steel anchorage protection schemes were also investigated. These included wrapping the ends in kaowool, using intumescent paint, covering the anchorage with fire rated plasterboard and covering the anchorage with timber (LVL). The results of the full-scale tests cover temperature distributions through the timber members during the tests, the temperatures reached within the cavity and those of the tendons suspended within the cavity, the relaxation of the tendons during the test, the failure mechanisms experienced, and a summary of the anchorage protection details and their effectiveness. Recommendations for the design of both post-tensioned timber beams and associated anchorages are also provided.
Online Access
Free
Resource Link
Less detail

Modelling the Fire Performance of Structural Timber Floors

https://research.thinkwood.com/en/permalink/catalogue212
Year of Publication
2012
Topic
Design and Systems
Fire
Material
Timber-Concrete Composite
Application
Floors
Author
O'Neill, James
Abu, Anthony
Carradine, David
Moss, Peter
Buchanan, Andrew
Year of Publication
2012
Country of Publication
Switzerland
Format
Conference Paper
Material
Timber-Concrete Composite
Application
Floors
Topic
Design and Systems
Fire
Keywords
Failure Mechanisms
Finite Element Model
Fire Resistance
Thermo-mechanical
Full Scale
Language
English
Conference
International Conference on Structures in Fire
Research Status
Complete
Notes
June 6-8, 2012, Zurich, Switzerland
Summary
This paper describes numerical modelling to predict the fire resistance of engineered timber floor systems. The floor systems under investigation are timber composite floors (various timber joist and box floor cross sections), and timber-concrete composite floors. The paper describes 3D numerical modelling of the floor systems using finite element software, carried out as a sequential thermo-mechanical analysis. Experimental testing of these floor assemblies is also being undertaken to calibrate and validate the models, with a number of full scale tests to determine the failure mechanisms for each floor type and assess fire damage to the respective system components. The final outcome of this research will be simplified design methods for calculating the fire resistance of a wide range of engineered timber floor systems.
Online Access
Free
Resource Link
Less detail

The Seismic Performance of a Post-Tensioned LVL Building During the 2011 Canterbury Earthquake Sequence

https://research.thinkwood.com/en/permalink/catalogue633
Year of Publication
2012
Topic
Seismic
Material
LVL (Laminated Veneer Lumber)
Application
Wood Building Systems
Author
Smith, Tobias
Carradine, David
Pampanin, Stefano
Ditommaso, Rocco
Carlo Ponzo, Felice
Year of Publication
2012
Country of Publication
Portugal
Format
Conference Paper
Material
LVL (Laminated Veneer Lumber)
Application
Wood Building Systems
Topic
Seismic
Keywords
Multi-Storey
Post-Tensioned
Language
English
Conference
World Conference on Earthquake Engineering
Research Status
Complete
Notes
September 24-28, 2012, Lisbon, Portugal
Summary
The seismic performance of a two storey post-tensioned Laminated Veneer Lumber (LVL) building during the aftershock sequence following the 6.3 MW 22nd February 2011 Canterbury earthquake is presented. The building is made from a new form of timber construction combining the use of concrete PRESSS technology and wood products using post-tensioning elements with large timber members. Originally a test specimen, the building was demounted and reassembled as the offices of the STIC research consortium on the campus of UoC. Close to the beginning of construction the 7.1 MW 2010 Darfield earthquake occurred in the Canterbury area however construction went ahead as planned with the building being almost complete when the more devastating 2011 February event occurred. Innovative techniques have been used to evaluate the seismic response of the building and this paper presents a general overview of building performance and provides insight into the behaviour of a post-tensioned structure.
Online Access
Free
Resource Link
Less detail

Seismic Performance of a Post-Tensioned LVL Building Subjected to the Canterbury Earthquake Sequence

https://research.thinkwood.com/en/permalink/catalogue157
Year of Publication
2012
Topic
Seismic
Material
LVL (Laminated Veneer Lumber)
Application
Frames
Walls
Wood Building Systems
Author
Smith, Tobias
Carradine, David
Pampanin, Stefano
Ditommaso, Rocco
Carlo Ponzo, Felice
Year of Publication
2012
Country of Publication
New Zealand
Format
Conference Paper
Material
LVL (Laminated Veneer Lumber)
Application
Frames
Walls
Wood Building Systems
Topic
Seismic
Keywords
Post-Tensioning
Quasi-Static
Dynamic
Language
English
Conference
New Zealand Society for Earthquake Engineering Conference
Research Status
Complete
Notes
April 13-15, 2012, Christchurch, New Zealand
Summary
The following paper presents the seismic performance of a two storey post-tensioned Laminated Veneer Lumber (LVL) building during the aftershock sequence following the MW 6.3 Canterbury earthquake that occurred on 22nd February 2011. Composed of post-tensioned walls in one direction and post-tensioned frames in the other, the structure under analysis was originally tested quasi-statically in the structural laboratories of the University of Canterbury (UoC), Christchurch, New Zealand. Following testing the building was demounted and reassembled as the offices of the STIC (Structural Timber Innovation Company) research consortium on the UoC campus with several significant changes being made to convert the building from its initial use as a test specimen into a functioning office structure.
Online Access
Free
Resource Link
Less detail

Shaking Table Testing of a Multi-Storey Post-Tensioned Timber Building

https://research.thinkwood.com/en/permalink/catalogue650
Year of Publication
2014
Topic
Seismic
Material
Glulam (Glue-Laminated Timber)
Application
Wood Building Systems
Author
Carradine, David
Nigro, Domenico
Simonetti, Michele
Smith, Tobias
Pampanin, Stefano
Di Cesare, Antonio
Carlo Ponzo, Felice
Year of Publication
2014
Country of Publication
New Zealand
Format
Conference Paper
Material
Glulam (Glue-Laminated Timber)
Application
Wood Building Systems
Topic
Seismic
Keywords
Multi-Storey
Post-Tensioned
Reinforcement
Shaking Table Testing
Dissipative Steel Angles
Language
English
Conference
New Zealand Society for Earthquake Engineering Conference
Research Status
Complete
Notes
March 21-23, 2014, Auckland, New Zealand
Summary
This paper describes results of shaking table testing of a post-tensioned timber frame building in the structural laboratory of the University of Basilicata in Potenza, Italy. This experimental campaign is part of a series of experimental tests in collaboration with the University of Canterbury in Christchurch, New Zealand. The specimen was 3-dimensional, 3-storey, 2/3rd scale and constructed using post-tensioned timber frames in both directions. The structure was tested with and without dissipative steel angle reinforcing which was designed to yield at a certain level of drift. These steel angles release energy through hysteresis during seismic loading, thus increasing damping. Testing was performed up to a maximum PGA of 0.77g with and 0.58g without the dissipative reinforcing. At comparable levels of PGA the addition of the reinforcing reduced drifts by 32% without increases in peak floor accelerations. Test results were also compared favourable against numerical blind predictions using the RUAUMOKO 2D and SAP2000 structural analysis programs.
Online Access
Free
Resource Link
Less detail

Shaking Table Tests of a PRES LAM Frame With and Without Additional Energy Dissipating Devices: Design and Testing Set-Up

https://research.thinkwood.com/en/permalink/catalogue646
Year of Publication
2013
Topic
Seismic
Material
Glulam (Glue-Laminated Timber)
Application
Wood Building Systems
Author
Smith, Tobias
Pampanin, Stefano
Carlo Ponzo, Felice
Di Cesare, Antonio
Simonetti, Michele
Nigro, Domenico
Carradine, David
Year of Publication
2013
Country of Publication
New Zealand
Format
Conference Paper
Material
Glulam (Glue-Laminated Timber)
Application
Wood Building Systems
Topic
Seismic
Keywords
Dissipative Steel Angles
Dynamic Testing
Post-Tensioning
Energy Dissipation
Language
English
Conference
New Zealand Society for Earthquake Engineering Conference
Research Status
Complete
Notes
April 26-28, 2013, Wellington, New Zealand
Summary
Post-tensioned timber (PRES LAM) is a new form of seismic resistant construction which already has real building applications throughout New Zealand. The innovative high seismic performance system combines the use of precast concrete PRESSS technology and engineered wood products combining post-tensioning elements (providing recentring) with large timber members. Additional steel dissipation devices are often also placed in order to provide additional strength and dissipative capacity. The following paper describes the design, fabrication and set-up of a dynamic testing campaign to be performed in the structural laboratory of the University of Basilicata (UNIBAS) in Potenza, Italy. The test specimen is a 2/3rd scale, 3-storey post-tensioned timber frame and wall are to be studied both with and without the addition of dissipative steel angles which are designed to yield at a certain level of drift in order to provide the desirable ‘flag shaped’ hysteretic response. These steel angles release energy through hysteresis during movement thus increasing damping as well as providing additional strength. The ratio between post-tensioning and energy dissipation provided will be altered between tests in order to investigate their contribution to dynamic frame performance. The specimen will be subjected to an increasing level of seismic loading using a set of 7 natural earthquakes selected from the European Strong Motion database. This paper first describes the testing set-up, the fabrication of the test specimen and testing apparatus and the selection of cases which will be tested.
Online Access
Free
Resource Link
Less detail

9 records – page 1 of 1.