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9 records – page 1 of 1.

Development of CLT Panels Bond-in Method for Seismic Retrofitting of RC Frame Structure

https://research.thinkwood.com/en/permalink/catalogue1860
Year of Publication
2016
Topic
Seismic
Design and Systems
Material
CLT (Cross-Laminated Timber)
Application
Walls
Frames
Author
Haba, Ryota
Kitamori, Akihisa
Mori, Takuro
Fukuhara, Takeshi
Kurihara, Takaaki
Isoda, Hiroshi
Publisher
J-STAGE
Year of Publication
2016
Country of Publication
Japan
Format
Journal Article
Material
CLT (Cross-Laminated Timber)
Application
Walls
Frames
Topic
Seismic
Design and Systems
Keywords
Retrofit
Earthquake
Panels
Adhesive
Bonding
Language
Japanese
Research Status
Complete
Series
Journal of Structural and Construction Engineering: Transactions of AIJ
Online Access
Free
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Effect of Opening on Seismic Performance of CLT Panel: Part. 1 Shear Test of H-Shape Specimen Panel

https://research.thinkwood.com/en/permalink/catalogue943
Year of Publication
2015
Topic
Seismic
Material
CLT (Cross-Laminated Timber)
Application
Wood Building Systems
Author
Ishiro, Taro
Mohri, Takumi
Yuheiri, Mouri
Nakahata, Takumi
Suzuki, Kei
Harada, Hiroshi
Mori, Takuro
Tanaka, Kei
Kaiko, Naoto
Inoue, Masafumi
Organization
Architectural Institute of Japan
Year of Publication
2015
Country of Publication
Japan
Format
Journal Article
Material
CLT (Cross-Laminated Timber)
Application
Wood Building Systems
Topic
Seismic
Keywords
Shear Test
Opening
Language
Japanese
Research Status
Complete
Summary
A concrete-filled steel tube (CFT) column system has many advantages compared with ordinary sttel or reinforced concrete system. One of the main advantages is the interaction between steel tube and concrete: occurrence of the local buckling of steel tube is delayed by the restraint of concrete, and the strength of concrete is increased by the confining effect provided from the steel tube. Extensive research work has been done in Japan over the last 15 years, including "New Urban Housing Project" and "US-Japan Cooperative Earthquake Research Program", in addition to the work done by individual universities and industries, which has been presented at the annual meeting of Architectural Institute of Japan (AIJ). This paper introduces the merits, design provisions and recent construction trends of CFT column systems in Japan, and discusses the results of trial designs of CFT theme structures which have been carried out to look for the advantages in the performance and construction cost compared with other constructional system.
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Effect of Opening on Seismic Performance of CLT Panel: Part. 2 Bending Shear Test of L-Shape Specimen Panel

https://research.thinkwood.com/en/permalink/catalogue942
Year of Publication
2015
Topic
Seismic
Material
CLT (Cross-Laminated Timber)
Application
Wood Building Systems
Author
Mohri, Takumi
Ishiro, Taro
Yuheiri, Mouri
Nakahata, Takumi
Suzuki, Kei
Harada, Hiroshi
Mori, Takuro
Tanaka, Kei
Kaiko, Naoto
Inoue, Masafumi
Organization
Architectural Institute of Japan
Year of Publication
2015
Country of Publication
Japan
Format
Journal Article
Material
CLT (Cross-Laminated Timber)
Application
Wood Building Systems
Topic
Seismic
Keywords
Bending Test
Shear
Opening
Language
Japanese
Research Status
Complete
Summary
The paper presents some experimental data and phenomenon on bracket anchor connections for Cross-Laminated-Timber. The goal of this research is to provide a better understanding of the seismic performance of bracket connections subjected to seismic actions and how to choose and design bracket connections for Cross-Laminated-Timber structures. Test configuration and experimental setups are illustrated in details; cyclic displacement schedules of the connections in two directions are presented considering that CLT wall has horizontal sliding in the plane and uplift at the end in quasi-state tests. Different failure modes and force transmission mechanisms of different connections under the loading protocol were analysed. And important quantities for seismic design such as strength, and stiffness, equivalent yield load, peak load and ductility of the connections are evaluated and compared among different kinds of connections; an excellent connector is revealed in ductility and load capacity by test data analysis. In addition, some suggestions to choose and design bracket anchor connections are given.
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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
Country of Publication
Canada
Format
Conference Paper
Material
Glulam (Glue-Laminated Timber)
Application
Frames
Topic
Connections
Mechanical Properties
Keywords
Slotted Bolted Connection
Vibration Test
Language
English
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.
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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
Country of Publication
Austria
Format
Conference Paper
Material
CLT (Cross-Laminated Timber)
Topic
Mechanical Properties
Keywords
Bending Tests
Bending Strength
Computational Model
Language
English
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.
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Performance of Semirigid Timber Frame with Lagscrewbolt Connections: Experimental, Analytical, and Numerical Model Results

https://research.thinkwood.com/en/permalink/catalogue201
Year of Publication
2015
Topic
Connections
Mechanical Properties
Material
Glulam (Glue-Laminated Timber)
Application
Beams
Author
Mori, Takuro
Nakatani, Makoto
Tesfamariam, Solomon
Publisher
Springer Berlin Heidelberg
Year of Publication
2015
Country of Publication
Germany
Format
Journal Article
Material
Glulam (Glue-Laminated Timber)
Application
Beams
Topic
Connections
Mechanical Properties
Keywords
Lag Screws
Beam-to-Column
Moment Resistance
Stiffness
Finite Element Model
Analytical Model
Numerical Model
Language
English
Research Status
Complete
Series
International Journal of Advanced Structural Engineering
ISSN
2008-6695
Summary
This paper presents analytical and numerical models for semirigid timber frame with Lagscrewbolt (LSB) connections. A series of static and reverse cyclic experimental tests were carried out for different beam sizes (400, 500, and 600 mm depth) and column–base connections with different numbers of LSBs (4, 5, 8). For the beam–column connections, with increase in beam depth, moment resistance and stiffness values increased, and ductility factor reduced. For the column–base connection, with increase in the number of LSBs, the strength, stiffness, and ductility values increased. A material model available in OpenSees, Pinching4 hysteretic model, was calibrated for all connection test results. Finally, analytical model of the portal frame was developed and compared with the experimental test results. Overall, there was good agreement with the experimental test results, and the Pinching4 hysteretic model can readily be used for full-scale structural model.
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Proposal of Reinforcing Method Using Wooden Sheets for Reduction of Strength Variation Coefficient of Glued Laminated Timber

https://research.thinkwood.com/en/permalink/catalogue1145
Year of Publication
2012
Topic
Mechanical Properties
Material
Glulam (Glue-Laminated Timber)
Author
Mori, Takuro
Adachi, Koji
Umemura, Kenji
Yamauchi, Hidefumi
Yano, Hiroyuki
Publisher
J-STAGE
Year of Publication
2012
Country of Publication
Japan
Format
Journal Article
Material
Glulam (Glue-Laminated Timber)
Topic
Mechanical Properties
Keywords
Bending Strength
Reinforcement
Bending Test
Strength Distribution
Defects
Language
Japanese
Research Status
Complete
Series
Journal of the Society of Materials Science, Japan
ISSN
1880-7488
Summary
Glued laminated timber (glulam) composed of mechanical-graded lamina shows higher strength reliability than lumber. However the glulam still has wider strength distribution than steel or concrete for structural applications because of the large difference between the mean and the lower limit value. This study aimed at reduction of the coefficient of variation of the glulam in bending strength by partial reinforcement technique using wooden sheets. The wooden sheets made from bamboo or white oak were covered to several defects on the surface of glulam such as large knots and finger joints. The strength performance and the reinforcement effect for the bending test of the glulam with reinforcement materials were evaluated. As a result, it was clarified that a bamboo sheet (two layers) or a white oak sliced veneer sheet could reinforce the defects, and the average of bending strength was improved due to the improvement in the lower value in the strength distribution.
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Reinforcement of Shear Failure with Long Screw in Moment-Resisting Joint

https://research.thinkwood.com/en/permalink/catalogue689
Year of Publication
2014
Topic
Connections
Mechanical Properties
Material
Glulam (Glue-Laminated Timber)
Application
Beams
Columns
Author
Nakatani, Makoto
Morita, Hideki
Mori, Takuro
Year of Publication
2014
Country of Publication
Canada
Format
Conference Paper
Material
Glulam (Glue-Laminated Timber)
Application
Beams
Columns
Topic
Connections
Mechanical Properties
Keywords
Lagscrewbolts
Shear Strength
Panel Zone
Language
English
Conference
World Conference on Timber Engineering
Research Status
Complete
Notes
August 10-14, 2014, Quebec City, Canada
Summary
Moment resisting joint with lagscrewbolts shows good mechanical performance and aesthetic. However, beam and column joints rarely showed a brittle shear failure in a panel zone of a column in previous studies. Therefore, a joint system reinforced by long screws was developed to prevent from the failure in this research. The maximum shear strength of the joint increased with increasing the number of long screws. However, the average of six screws specimens was lower than that of four screws, because the glulam and some of the screws were damaged due to the narrow space between the screws during an inserting process of the screws.
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Free
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Verification of Seismic Resistant Performance of Developed Original Cross-Laminated Timber Core Structure Method by Shaking Table Experiment

https://research.thinkwood.com/en/permalink/catalogue2699
Year of Publication
2020
Topic
Seismic
Connections
Material
CLT (Cross-Laminated Timber)
Application
Wood Building Systems
Author
Gunawan, Indra
Moritani, K
Isoda, Hiroshi
Mori, Takuro
Shinohara, M
Noda, T
Hosomi, R
Kurumada, Shinsuke
Makita, T
Publisher
IOP Publishing Ltd
Year of Publication
2020
Format
Journal Article
Material
CLT (Cross-Laminated Timber)
Application
Wood Building Systems
Topic
Seismic
Connections
Keywords
Core Structure
Shaking Table
Joint
Wall-to-Foundation
Wall-to-Wall
Earthquake
Shear Force
Research Status
Complete
Series
IOP Conference Series: Materials Science and Engineering
Summary
In recent years, development of wood engineering is gradually increasing. Instead of using many wood columns, cross laminated timber is expected for constructing spacious open space building. Since cross-laminated timber has high rigidity and strength, cross-laminated timber is expected to be used as earthquake resistant wall or floor diaphragm that makes the span of building can be increased and the position of the wall can be adjusted openly. In order to optimize the performance of cross-laminated timber for open space building, original cross laminated timber core structure method was developed. In this paper, the development concept of original cross laminated timber core structure method will be explained. In this method, the joint connection for each element such as joint connection for wall-concrete foundation, wall-beam, and wall to hanging wall was also developed. The experiment to verify the strength and rigidity of each connection has been conducted and the result will be described. The shaking table experiment of 3-story open space building constructed by original cross laminated timber structure using varies earthquake waves was conducted. In this experiment natural period, shear force for each floor, story drift, and building response data is taken. The result shows the structure designed by original CLT core structure method is satisfy the requirement based on Japan cross-laminated panel structure regulation.
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9 records – page 1 of 1.