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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
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
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.
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Non-Linear Numerical Modelling of a Post-Tensioned Timber Frame Building with Dissipative Steel Angle Devices

https://research.thinkwood.com/en/permalink/catalogue649
Year of Publication
2014
Topic
Seismic
Material
Glulam (Glue-Laminated Timber)
Application
Wood Building Systems
Author
Simonetti, Michele
Smith, Tobias
Carlo Ponzo, Felice
Di Cesare, Antonio
Pampanin, Stefano
Nigro, Domenico
Year of Publication
2014
Format
Conference Paper
Material
Glulam (Glue-Laminated Timber)
Application
Wood Building Systems
Topic
Seismic
Keywords
Numerical modelling
Pres-Lam
Non-linear Dynamic Loading
Static Loading
Beam-Column Joint
Dissipative Steel Angles
Conference
European Conference on Earthquake Engineering and Seismology
Research Status
Complete
Notes
August 25-29, 2014, Istanbul, Turkey
Summary
This paper describes the numerical modelling of post-tensioned timber (Pres-Lam) frame systems under non-linear dynamic and static loading. From the conception of the post-tensioned jointed ductile concept it has been clear that the nature of its controlled rocking mechanism leant itself well to the use of a lumped plasticity approach. This approach combines the use of elastic elements with springs representing plastic rotations in the system. Two experimental testing campaigns have been used in order to confirm the effectiveness of this modelling technique in predicting both the global (frame) and local (beam-column) response of these systems. The first of these tests was a full scale beam-column joint tested quasi-statically and the second was a 3-dimensional, 3-storey, 2/3rd scale multi-storey post-tensioned timber frame building tested dynamically. During the testing programmes the specimens were tested both with and without the addition of dissipative steel angles which were designed to yield at a certain level of drift. These steel angles release energy through hysteresis during lateral frame movement thus increasing damping. Both structures were modelled using a lumped plasticity approach with springs that were calibrated against the moment rotation design procedure used for post-tensioned timber connections. This work has proved the adequacy of the use of two numerical modelling programs, RUAUMOKO and SAP2000, in providing accurate representation of structural response when calibrated against current design procedures. All testing was performed 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, Christchurch, New Zealand.
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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
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
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.
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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
Format
Conference Paper
Material
Glulam (Glue-Laminated Timber)
Application
Wood Building Systems
Topic
Seismic
Keywords
Dissipative Steel Angles
Dynamic Testing
Post-Tensioning
Energy Dissipation
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.
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