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                                              CLT
                                                                                                                           Oregon State University
                                                                                                                                       College of Forestry
                                                            CROSS LAMINATED                                            TIMBER                      Department of Wood Science and Engineering
                                                                                                Evaluating Effects of Non-Uniform Scaling On Structural Properties
                                                                                                    Using Digital-Image Correlation Deflection Mapping
                                              Introduction                                                              Benjamin Sundberg - Undergraduate Research Fellow OSU COF:WSE COE:CCE
                                              Cross Laminated Timber (CLT) is a                                           Lech Muszynski - Associate Professor OSU COF WSE
                                              relatively new timber product which consists                                  Melanie Noyel - International Graduate Intern                     Digital Image Correlation
                                              of orthogonally oriented dimensioned lumber                                    Thomas Pisaneschi - International Graduate Intern                The deformation of panels during
                                              glued together similar to laminated veneer                                        Vaclav Sebera - Mendel Uni. Brno                              mechanical testing were recorded using
                                              plywood. CLT is cur r ently being used in                                                                                                                                   full field optical measurements based on
                                              Europe but has not yet emerged into the North American Market.                                                                                                              the digital image correlation (DIC) principle.
                                              One of the reasons for this is the lack of standards and testing     Research in Progress at OSU                                                                            Stereographic images of the deflected
                                              procedures for the material.                                                                                                                                                surface are captured by a pair of digital
                                                                                                                   Objectives:
                                                                                                                                                                                                                          camer as and ar e then pr ocessed by
                                                                                                                   The pr imar y goals of the r esear ch at Or egon State
                                                                                                                                                                                                                          advanced computer software.This system




                                                                                                                                                                                                                                                                                                       PRODUCED BY AN AUTODESK EDUCATIONAL PRODUCT
PRODUCED BY AN AUTODESK EDUCATIONAL PRODUCT




                                                                                                                   University are to:
                                              History of CLT                                                         -   Develop testing protocols for panel specimens utilizing
                                                                                                                                                                                                                          returns full field deflection maps across the
                                                                                                                                                                                                                          surface of the panel. This is a great advantage to the traditional topical
                                              CLT was developed in Sweden in the 1970's. However, it wasn't               non-contact full field optical measurement based on
                                                                                                                                                                                                                          measurement of limited discrete points using LVDT's. Full f ield
                                              marketed or produced until the early 1990's. In 1996, Austria              Digital Image Correlation (DIC).
                                                                                                                                                                                                                          deflection measurements enable more accurate comparisons of the
                                              undertook a joint industry-academic research venture that              -   Derive correction factors which will allow predicting
                                                                                                                                                                                                                          outcomes with analytical models and FEM simulations. The anisotropic
                                              standardized the production process and testing procedures                  the mechanical performance of full sized structural
                                                                                                                                                                                                                          nature of the panels may be reflected and characterized in a single test.
                                              ultimately creating modern CLT.                                             panels f rom tests perf ormed on smaller panels
                                                                                                                                                                                                                          This new and exciting technique has been integral in developing the
                                                                                                                          specimens. Smaller panels are easier and less
                                                                                                                                                                                                                          scaling factors for approximating full size panel performance from tests
                                              2007 - the Japanese erected a full scale seven story CLT structure          expensive to manuf acture f or entrepreneurs
                                                                                                                                                                                                                          on smaller specimens.
                                              on the world's largest seismic shake                                        considering entering the market.
                                              table "E-Defense" and subjected the                                                                -
                                              building to 10 earthquakes in a row.                                 Materials:
                                              Fr om this test, the r esear cher s                                  Oregon Hybrid Poplar harvested from Collins/Greenwood                                                  Conclusions and Future Work
                                              concluded that CLT is very good at                                   plantation near Boarman, OR. PRF resin formulated for                                                  Conclusions: The analysis of the full field deflection data acquired from
                                              resisting seismic forces.                                            glulam beams from Hexiom Specialty Chemicals.                                                          optical measurements is pending. The precision and accuracy of the
                                                                                                                                                                                                                          optical measurement is specific to the experimental setup. In our tests
                                              2010 - The Bridgeport House,                                         The study included:                                                                                    the pr ecision of the out of plane def lection was within 0.001"
                                              constructed almost entirely out of                                   Determination of optimal bonding conditions conducted on
                                              cross laminated panels, was finished                                 small billets.                                                                                         Future work includes the
                                              in London. At 9 storey, the Bridgeport House is the tallest timber                                                                                                          construction of full size structural
                                              structure in the world .                                             Construction of 3-Layer CLT Panel specimens for                                                        panel specimens, and the
                                                                                                                   mechanical testing (2'x2', 4'x4', 4'x8')                                                               bending and torsion tests on
                                              2010 - Researchers at OSU began pilot tests on hybrid poplar CLT.                                                                                                           those panels. The data generated
                                                                                                                   Mechanical testing of small and medium sized panels in                                                 from these tests will allow us to
                                              2011 - FP Innovations Canada releases CLT Handbook - First step      torsion and center point bending. Including FEM simulation                                             develop the correction factors for
                                              towards North American market emergence.                             of these mechanical tests. This portion of the study is in                                             tests done on small scale
                                                                                                                   progress.                                                                                              specimens.

                                                                                                                                                                            PRODUCED BY AN AUTODESK EDUCATIONAL PRODUCT

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Poster ic2011 sundberg

  • 1. PRODUCED BY AN AUTODESK EDUCATIONAL PRODUCT CLT Oregon State University College of Forestry CROSS LAMINATED TIMBER Department of Wood Science and Engineering Evaluating Effects of Non-Uniform Scaling On Structural Properties Using Digital-Image Correlation Deflection Mapping Introduction Benjamin Sundberg - Undergraduate Research Fellow OSU COF:WSE COE:CCE Cross Laminated Timber (CLT) is a Lech Muszynski - Associate Professor OSU COF WSE relatively new timber product which consists Melanie Noyel - International Graduate Intern Digital Image Correlation of orthogonally oriented dimensioned lumber Thomas Pisaneschi - International Graduate Intern The deformation of panels during glued together similar to laminated veneer Vaclav Sebera - Mendel Uni. Brno mechanical testing were recorded using plywood. CLT is cur r ently being used in full field optical measurements based on Europe but has not yet emerged into the North American Market. the digital image correlation (DIC) principle. One of the reasons for this is the lack of standards and testing Research in Progress at OSU Stereographic images of the deflected procedures for the material. surface are captured by a pair of digital Objectives: camer as and ar e then pr ocessed by The pr imar y goals of the r esear ch at Or egon State advanced computer software.This system PRODUCED BY AN AUTODESK EDUCATIONAL PRODUCT PRODUCED BY AN AUTODESK EDUCATIONAL PRODUCT University are to: History of CLT - Develop testing protocols for panel specimens utilizing returns full field deflection maps across the surface of the panel. This is a great advantage to the traditional topical CLT was developed in Sweden in the 1970's. However, it wasn't non-contact full field optical measurement based on measurement of limited discrete points using LVDT's. Full f ield marketed or produced until the early 1990's. In 1996, Austria Digital Image Correlation (DIC). deflection measurements enable more accurate comparisons of the undertook a joint industry-academic research venture that - Derive correction factors which will allow predicting outcomes with analytical models and FEM simulations. The anisotropic standardized the production process and testing procedures the mechanical performance of full sized structural nature of the panels may be reflected and characterized in a single test. ultimately creating modern CLT. panels f rom tests perf ormed on smaller panels This new and exciting technique has been integral in developing the specimens. Smaller panels are easier and less scaling factors for approximating full size panel performance from tests 2007 - the Japanese erected a full scale seven story CLT structure expensive to manuf acture f or entrepreneurs on smaller specimens. on the world's largest seismic shake considering entering the market. table "E-Defense" and subjected the - building to 10 earthquakes in a row. Materials: Fr om this test, the r esear cher s Oregon Hybrid Poplar harvested from Collins/Greenwood Conclusions and Future Work concluded that CLT is very good at plantation near Boarman, OR. PRF resin formulated for Conclusions: The analysis of the full field deflection data acquired from resisting seismic forces. glulam beams from Hexiom Specialty Chemicals. optical measurements is pending. The precision and accuracy of the optical measurement is specific to the experimental setup. In our tests 2010 - The Bridgeport House, The study included: the pr ecision of the out of plane def lection was within 0.001" constructed almost entirely out of Determination of optimal bonding conditions conducted on cross laminated panels, was finished small billets. Future work includes the in London. At 9 storey, the Bridgeport House is the tallest timber construction of full size structural structure in the world . Construction of 3-Layer CLT Panel specimens for panel specimens, and the mechanical testing (2'x2', 4'x4', 4'x8') bending and torsion tests on 2010 - Researchers at OSU began pilot tests on hybrid poplar CLT. those panels. The data generated Mechanical testing of small and medium sized panels in from these tests will allow us to 2011 - FP Innovations Canada releases CLT Handbook - First step torsion and center point bending. Including FEM simulation develop the correction factors for towards North American market emergence. of these mechanical tests. This portion of the study is in tests done on small scale progress. specimens. PRODUCED BY AN AUTODESK EDUCATIONAL PRODUCT