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Field Testing on Innovative Timber Structures

https://research.thinkwood.com/en/permalink/catalogue671
Year of Publication
2014
Topic
Design and Systems
Material
LVL (Laminated Veneer Lumber)
Application
Floors
Frames
Author
Leyder, Claude
Wanninger, Flavio
Frangi, Andrea
Year of Publication
2014
Format
Conference Paper
Material
LVL (Laminated Veneer Lumber)
Application
Floors
Frames
Topic
Design and Systems
Keywords
Beech
Post-Tensioned
Office Buildings
Conference
World Conference on Timber Engineering
Research Status
Complete
Notes
August 10-14, 2014, Quebec City, Canada
Summary
In timber research, a main objective is the development and promotion of innovative and efficient timber structures. Therefore a pilot building, named ETH House of Natural Resources, has been designed, which uses two innovative structural systems, a post-tensioned timber frame and a composite beech LVL concrete floor. The building will be used as an office building for the Laboratory of Hydraulics, Hydrology and Glaciology from ETH Zürich and will serve as a showcase building of a sustainable and reliable timber construction for students and researchers, among others.
Online Access
Free
Resource Link
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Investigation of a Post-Tensioned Timber Connection

https://research.thinkwood.com/en/permalink/catalogue335
Year of Publication
2014
Topic
Connections
Mechanical Properties
Material
Glulam (Glue-Laminated Timber)
Application
Beams
Author
Frangi, Andrea
Wanninger, Flavio
Organization
ETH Zurich
Year of Publication
2014
Format
Report
Material
Glulam (Glue-Laminated Timber)
Application
Beams
Topic
Connections
Mechanical Properties
Keywords
Ash
Bending Test
Failure
Hardwood
Post-Tensioned
Reinforcement
Spruce
Research Status
Complete
Summary
A post tensioned timber connection made of glulam has been developed at the ETH in Zurich. The connection is made of spruce with ash reinforcement in the connection area where high stresses perpendicular to the grain occur. The moment-rotation-behaviour of this post-tensioned beam-column timber joint has been analysed with a series of static bending tests. The timber joint was loaded at the ends of the beams in order to apply a moment to the connection. The tests were conducted with different forces in the tendon, from 300 kN up to 700 kN. The bending tests were performed with a controlled load level, so that no embedment failure perpendicular to the grain occurred in the column. The intended self-centring behaviour could be verified and no damage could be observed during all the tests. A final bending test was conducted in order to study the failure mode of the post-tensioned timber connection. The vertical load on the beams was increased until the tendon-elongation got so high that the test had to be aborted due to safety reasons. Nearly no damage occurred during the last test, only minor residual deformations could be observed. The failure is an embedment failure in the column due to exceedance of the strength perpendicular to the grain. The specimen, test setup, instrumentation and the results of all performed tests are presented in this technical report.
Online Access
Free
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Post-Tensioned Timber Connections, Experimental Analysis of the Long Term Behavior

https://research.thinkwood.com/en/permalink/catalogue527
Year of Publication
2014
Topic
Connections
Mechanical Properties
Material
Glulam (Glue-Laminated Timber)
Author
Wanninger, Flavio
Frangi, Andrea
Year of Publication
2014
Format
Conference Paper
Material
Glulam (Glue-Laminated Timber)
Topic
Connections
Mechanical Properties
Keywords
Climate
Post-Tensioning
Relative Humidity
Temperature
Long-term Behaviour
Conference
World Conference on Timber Engineering
Research Status
Complete
Notes
August 10-14, 2014, Quebec City, Canada
Summary
To estimate the loss of tendon force for a post-tensioned timber connection a series of tests are being conducted at the ETH in Zurich. Several post-tensioned specimens are being observed in different climate conditions. One set of specimens is in a climate chamber, where the relative humidity and temperature are kept constant. The second set of test specimens is positioned in an uncontrolled environment, where temperature and relative humidity change daily. The two environments allow estimating the influence of changes in relative humidity and temperature on the loss rate of tendon force. First results show that the relative humidity influences this rate, making it a key variable to estimate the total loss in post-tensioning force during the lifetime of a building.
Online Access
Free
Resource Link
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Post-Tensioned Timber Frame Structures

https://research.thinkwood.com/en/permalink/catalogue63
Year of Publication
2015
Topic
Connections
Material
Glulam (Glue-Laminated Timber)
Application
Beams
Columns
Author
Wanninger, Flavio
Organization
ETH Zurich
Year of Publication
2015
Format
Thesis
Material
Glulam (Glue-Laminated Timber)
Application
Beams
Columns
Topic
Connections
Keywords
Moment Resistance
Economical
Timber Joints
Moment-Rotation
Bending Test
Pushover Test
Numerical Modeling
Research Status
Complete
Summary
The present research report was written as a PhD thesis (ETH Dissertation Nr. 22815) by Flavio Wanninger and shows the results of a comprehensive experimental and numerical analysis on the structural behaviour of post-tensioned timber frame, in particular with focus on the momentrotation-behaviour of the developed post-tensioned beam-column timber joint using hardwood and the long-term behaviour of the system. The results of the experimental and numerical investigations provide reliable data for the development and validation of calculation models for the design of post-tensioned timber frames with hardwood for vertical and horizontal loads and taking into account the long-term behaviour. The objective of the research project is the development and implementation of post-tensioned timber frame structures into the practice and fits well into the overall research strategy of the institute on the development of innovative solutions for timber structures.
Online Access
Free
Resource Link
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