Skip header and navigation

15 records – page 1 of 2.

Creep and Duration Of Load Characteristics of Cross Laminated Timber

https://research.thinkwood.com/en/permalink/catalogue692
Year of Publication
2014
Topic
Mechanical Properties
Material
CLT (Cross-Laminated Timber)
Author
Nakajima, Shiro
Miyatake, Atsushi
Shibuwasa, Tatsuya
Araki, Yasuhiro
Yamaguchi, Nobuyoshi
Haramiishi, Takeshi
Ando, Naoto
Yasumura, Motoi
Year of Publication
2014
Format
Conference Paper
Material
CLT (Cross-Laminated Timber)
Topic
Mechanical Properties
Keywords
Cedar
Creep
Duration of Load
Conference
World Conference on Timber Engineering
Research Status
Complete
Notes
August 10-14, 2014, Quebec City, Canada
Summary
Creep and duration of load characteristics of cross laminated timber (CLT) were evaluated from the test results of creep and duration of tests. Japanese Ceder (Cryptomeria japonica) was chosen for the specie for the laminations of the test specimens and API was chosen for the adhesive. The results are summarized as follows: (1) The creep factor [i.e. (Initial deflection + Creep deflection) / Initial deflection] for CLT was evaluated to be 2.0 and was almost equivalent to the creep factor commonly known for solid lumber. (2) The duration of load factor [i.e. Strength for 50 years duration of load / Strength for 10 minutes duration of load] of CLT was evaluated to be 0.66 and was almost equivalent to the duration of load factor measured for solid lumbers.
Online Access
Free
Resource Link
Less detail

Effect of Array on Tensile Load Carrying Capacity CLT Drift Pinned Joint

https://research.thinkwood.com/en/permalink/catalogue1532
Year of Publication
2016
Topic
Connections
Mechanical Properties
Material
CLT (Cross-Laminated Timber)
Author
Nakashima, Shoichi
Kitamori, Akihisa
Araki, Yasuhiro
Isoda, Hiroshi
Year of Publication
2016
Format
Conference Paper
Material
CLT (Cross-Laminated Timber)
Topic
Connections
Mechanical Properties
Keywords
Reduction Coefficients
Dowel-Type Connections
Drift Pinned Joint
Tensile Tests
Stiffness
Proportional Limit Load
Conference
World Conference on Timber Engineering
Research Status
Complete
Notes
August 22-25, 2016, Vienna, Austria p. 772-779
Summary
A reduction coefficient is applied in usual design of multiple dowels type connections. The numbers of stiffeners in row is one of important factor to decide this coefficient. CLT drift pinned joint showed small orthotropy against in plane tensile load. Tensile tests of multiple drift pins joints were performed to evaluate the effect of array. Numbers of drift pins n in each specimen were same (n=12), but the arrangements were different (2 x 6, 3 x 4, 4 x 3, 6 x 2). Also the grain directions were parameters (0, 90 degrees). The reduction of initial stiffness and proportional limit load showed good agreement between theoretical prediction and experimental results.
Online Access
Free
Resource Link
Less detail

Embedding Behaviour of Cross Laminated Timber Panels Manufactured from Sugi

https://research.thinkwood.com/en/permalink/catalogue586
Year of Publication
2014
Topic
Mechanical Properties
Material
CLT (Cross-Laminated Timber)
Application
Wood Building Systems
Author
Yamaguchi, Nobuyoshi
Nakajima, Shiro
Araki, Yasuhiro
Miyatake, Atsushi
Ando, Naoto
Year of Publication
2014
Format
Conference Paper
Material
CLT (Cross-Laminated Timber)
Application
Wood Building Systems
Topic
Mechanical Properties
Keywords
Compression Tests
Embedding Tests
Panels
Conference
World Conference on Timber Engineering
Research Status
Complete
Notes
August 10-14, 2014, Quebec City, Canada
Summary
Rocking of narrow wall panels/columns causes embedding forces on the floor panels during earthquakes. In plain/out of plain compression tests and out of plain embedding tests of CLT panels were conducted. Compression and embedding strengths of in plain/out of plain strengths of Sugi CLT panels were obtained. These strengths of CLT panels with /without edge-glues were compared. Out of plain embedding strength loaded at the corner of CLT panels was fairly less than the normal embedding strength, and it was around the middle of the normal embedding and compression strengths. Seismic design is required to CLT buildings in Japan. Embedding performance of joints is significant to maintain ductility of timber structures during earthquakes. CLT wall panels are installed on the CLT floor panels, and narrow wall panels and columns make rocking on the floor panels during earthquakes. Both edges of the wall panels apply embedding forces on the floor panels. Tension behaviour of the joints between wall and floor panels is dominated by those of connecters, etc. Compression behaviour of the joints depends on the embedding behaviour of in plain/out of plain CLT panels of walls and floors. In plain/out of plain compressions, out of plain embedding and rotational embedding performance of CLT panes are required to be clarified. In plain/out of plain compression tests and out of plain embedding tests of CLT panels are conducted. Effects of edge-glue of CLT panels are also analysed.
Online Access
Free
Resource Link
Less detail

Evaluation of Buckling Strength of Cross Laminated Timber

https://research.thinkwood.com/en/permalink/catalogue1576
Year of Publication
2016
Topic
Mechanical Properties
Material
CLT (Cross-Laminated Timber)
Author
Nakajima, Shiro
Miyatake, Atsushi
Shibuwasa, Tatsuya
Araki, Yasuhiro
Shindo, Kenta
Haramiishi, Takeshi
Kudo, Yudai
Year of Publication
2016
Format
Conference Paper
Material
CLT (Cross-Laminated Timber)
Topic
Mechanical Properties
Keywords
Japanese Building Code
Buckling Strength
Buckling Test
Buckling Loads
Conference
World Conference on Timber Engineering
Research Status
Complete
Notes
August 22-25, 2016, Vienna, Austria p. 1707-1714
Summary
The Japanese Building Code provides formulas to calculate the buckling strength for structural lumber and structural wooden engineered products such as glulam and LVL. The adaptability of these formulas against cross laminated timbers is discuss in this paper. To determining the buckling strength properties for cross laminated timbers a series of buckling test were operated for full-size cross laminated timber of certain structural grades. The buckling loads obtained though these tests were compared to those derived from the formulas given in the Japanese Building Code. The measured buckling loads and the calculated buckling loads were almost equivalent. The result indicated that in general the formulas given in the Japanese Building Code can well evaluate the buckling strength of cross laminated timbers.
Online Access
Free
Resource Link
Less detail

Evaluation of Dynamic Performance of Glulam Frame Structure Composed of Slotted Bolted Connection System

https://research.thinkwood.com/en/permalink/catalogue503
Year of Publication
2014
Topic
Connections
Mechanical Properties
Material
Glulam (Glue-Laminated Timber)
Application
Frames
Author
Komatsu, Kohei
Mori, Takuro
Kitamori, Akihisa
Araki, Yasuhiro
Year of Publication
2014
Format
Conference Paper
Material
Glulam (Glue-Laminated Timber)
Application
Frames
Topic
Connections
Mechanical Properties
Keywords
Slotted Bolted Connection
Vibration Test
Conference
World Conference on Timber Engineering
Research Status
Complete
Notes
August 10-14, 2014, Quebec City, Canada
Summary
Earthquake-resisting performance of glulam frame structure was evaluated by shaking table tests on a specially designed glulam “double cross shape” specimen composed of slotted bolted connection (SBC) system. By the first vibration test using sinusoidal wave, the specimen survived until 80% level of input waves without damage. After renewing SBC system, the second vibration test was done on a same specimen using the JMA-Kobe NS waves having a maximum acceleration of 816gal. The specimen survived until 100% level of input without damage but failed by the panel-shear when 120% level was inputted. Earthquake-resisting performance of glulam moment-resisting joints composed of SBC system was considered as satisfactory enough for ductile joint system, but improvement of panelshear of glulam member itself was recognized as a future research need.
Online Access
Free
Resource Link
Less detail

Evaluation of Lamination Effect on In-Plane Bending Strength of Cross Laminated Timber

https://research.thinkwood.com/en/permalink/catalogue1542
Year of Publication
2016
Topic
Mechanical Properties
Material
CLT (Cross-Laminated Timber)
Author
Aoyama, Tsuyoshi
Kitamori, Akihisa
Mori, Takuro
Isoda, Hiroshi
Araki, Yasuhiro
Nakagawa, Takafumi
Year of Publication
2016
Format
Conference Paper
Material
CLT (Cross-Laminated Timber)
Topic
Mechanical Properties
Keywords
Bending Tests
Bending Strength
Computational Model
Conference
World Conference on Timber Engineering
Research Status
Complete
Notes
August 22-25, 2016, Vienna, Austria p. 1105-1112
Summary
Various kind of in-plane bending tests of cross laminated timber (CLT) with different shapes have been previously carried out. The results indicate that the bending strength of CLT loaded in plane reduces as the number of layer increases. To evaluate this lamination effect on in-plane bending strength of CLT, a computational model based on Monte Carlo method was developed. The estimated bending strength showed the same tendency.
Online Access
Free
Resource Link
Less detail

Full Scale Shake Table Tests on Five Story and Three Story CLT Building Structures

https://research.thinkwood.com/en/permalink/catalogue1670
Year of Publication
2016
Topic
Seismic
Material
CLT (Cross-Laminated Timber)
Application
Wood Building Systems
Author
Kawai, Naohito
Miyake, Tatsuya
Yasumura, Motoi
Isoda, Hiroshi
Koshihara, Mikio
Nakajima, Shiro
Araki, Yasuhiro
Nakagawa, Takafumi
Sato, Motoshi
Year of Publication
2016
Format
Conference Paper
Material
CLT (Cross-Laminated Timber)
Application
Wood Building Systems
Topic
Seismic
Keywords
Full Scale
Shake Table Tests
Japan
Conference
World Conference on Timber Engineering
Research Status
Complete
Notes
August 22-25, 2016, Vienna, Austria p. 3828-3835
Summary
The national research project to investigate proper structural design method for CLT (Cross Laminated Timber) buildings has been advanced by the subsidy of the Ministry of Land, Infrastructure, Transport and Tourism of Japan since 2011. This paper provides the outline of shake table tests executed as a part of the project in February 2015. Two specimens, one (Specimen A) is five story and another (Specimen B) is three story, were tested. As the result, for both specimens damage was rather slight by the strong input wave according to the Building Standard Law of Japan. Finally, Specimen A survived three dimensional input wave of 100% of JMA Kobe (strong ground motion recorded during Kobe Earthquake in 1995), and Specimen B survived 140% of JMA Kobe.
Online Access
Free
Resource Link
Less detail

In-Plane Shear Test of Full Scale Cross Laminated Timber Panels

https://research.thinkwood.com/en/permalink/catalogue602
Year of Publication
2014
Topic
Mechanical Properties
Material
CLT (Cross-Laminated Timber)
Application
Walls
Author
Araki, Yasuhiro
Nakajima, Shiro
Yamaguchi, Yoshinobu
Nakagawa, Takafumi
Miyatake, Atsushi
Yasumura, Motoi
Year of Publication
2014
Format
Conference Paper
Material
CLT (Cross-Laminated Timber)
Application
Walls
Topic
Mechanical Properties
Keywords
Panels
In-Plane Shear Test
Conference
World Conference on Timber Engineering
Research Status
Complete
Notes
August 10-14, 2014, Quebec City, Canada
Summary
The in-plane shear specimens of full scale CLT panels are tested. From the test results, about the failure behaviour, if there is finger joint near the shear plane, cracks are tended to progress along the joint was confirmed. About the maximum shear unit stress was about 3N/mm2 , and shear stiffness was about 600GPa calculated as the total cross section effective. CLT is composed of longitudinal layers and cross layers. When the CLT is used as shear wall, it is important to understand the in-plane shear performance in order to control the structural performance of wall and joints and the collapse mechanism. Therefore, the in-plane shear specimens of full scale CLT panels are tested.
Online Access
Free
Resource Link
Less detail

Research Outline of Seismic Standard Development for CLT Construction in Japan

https://research.thinkwood.com/en/permalink/catalogue1645
Year of Publication
2016
Topic
Design and Systems
Seismic
Material
CLT (Cross-Laminated Timber)
Application
Wood Building Systems
Author
Araki, Yasuhiro
Nakagawa, Takafumi
Kawai, Naohito
Isoda, Hiroshi
Year of Publication
2016
Format
Conference Paper
Material
CLT (Cross-Laminated Timber)
Application
Wood Building Systems
Topic
Design and Systems
Seismic
Keywords
Japan
Conference
World Conference on Timber Engineering
Research Status
Complete
Notes
August 22-25, 2016, Vienna, Austria p. 3420-3427
Summary
The national research project to investigate proper structural design method for CLT(Cross Laminated Timber) buildings has been advanced by the subside of the Ministry of Land, Infrastructure, Transport and Tourism of Japan since 2011. This paper provides the outline, research item and main result stream of the project. Full-scaled building tests and element tests for evaluating seismic performance are described in this paper mainly. Numerical studies have been also conducting as well.
Online Access
Free
Resource Link
Less detail

Strength Properties of CLT Composed of Sugi Laminations : (9) Small Scale CLT Shear Wall

https://research.thinkwood.com/en/permalink/catalogue984
Year of Publication
2013
Topic
Mechanical Properties
Material
CLT (Cross-Laminated Timber)
Application
Shear Walls
Author
Watanabe, Hiroshi
Araki, Yasuhiro
Nakajima, Shiro
Miyattaki, Atsushi
Yasumura, Motoi
Ando, Naoto
Kaiko, Naoto
Organization
Architectural Institute of Japan
Year of Publication
2013
Format
Journal Article
Material
CLT (Cross-Laminated Timber)
Application
Shear Walls
Topic
Mechanical Properties
Keywords
In-Plane Shear Force
Strength Properties
Sugi
Research Status
Complete
Summary
An investigation was carried out on CLT panels made from Sitka spruce in order to establish the effect of the thickness of CLT panels on the bending stiffness and strength and the rolling shear. Bending and shear tests on 3-layer and 5-layer panels were performed with loading in the out-of-plane and in-plane directions. ‘Global’ stiffness measurements were found to correlate well with theoretical values. Based on the results, there was a general tendency that both the bending strength and rolling shear decreased with panel thickness. Mean values for rolling shear ranged from 1.0 N/mm2 to 2.0 N/mm2.
Online Access
Free
Resource Link
Less detail

15 records – page 1 of 2.