The structural behaviour of timber joints subjected to bi‐axial bending

Chang, Wen‐Shao; Shanks, Jonathan; Kitamori, Akihisa; Komatsu, Kenshi

doi:10.1002/eqe.854

Cited by 10 publications

(3 citation statements)

References 11 publications

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“…As a result, the design of timber joints is extremely important. In some Asian countries such as China, South Korea, and Japan, mortise and tenon joints [1][2][3][4][5] are traditionally used in timber buildings from dwelling houses to palaces. In these joints, steel fasteners are not used, therefore keeping the original beauty of the timber.…”

Section: Introductionmentioning

confidence: 99%

Experiment on Behavior of a New Connector Used in Bamboo (Timber) Frame Structure under Cyclic Loading

Zhou

Huang

et al. 2018

Advances in Materials Science and Engineering

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Connection is an important part of the bamboo and timber structure, and it directly influences the overall structural performance and safety. Based on a comprehensive analysis of the mechanical performance of several wood connections, a new connector for the bamboo (timber) frame joint was proposed in this paper. Three full-scale T-type joint specimens were designed to study the mechanical performance under cyclic loading. The thickness of the hollow steel column was different among three specimens. The specimens were loaded under displacement control with a rate of 10 mm per minute until the specimens reach failure. It was observed that the failures of three specimens were caused by the buckling of flanges in the compression and that the steel of connections does not yield. The load-displacement hysteretic curve for three specimens is relatively plump, and the stiffness of connection degenerates with the increasing of cyclic load. The maximum rotation is 0.049 rad, and the energy dissipation coefficient is 1.77. The thickness of the hollow steel column of the connector has significant impact on the energy dissipation capacity and the strength of the connection. A simplified moment-rotation hysteresis model for the joint was proposed.

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Section: Introductionmentioning

confidence: 99%

Experiment on Behavior of a New Connector Used in Bamboo (Timber) Frame Structure under Cyclic Loading

Zhou

Huang

et al. 2018

Advances in Materials Science and Engineering

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“…They were constrained translationally in the three axes and rotationally around the z-axis. The decisions on the omission of the girts and the application of the hinge connections were taken, taking into account the limited contributions of nuki joints and iron pegs to masonry walls based on relevant references on timber joint behaviour [68][69][70][71]. Rigid connections were applied to connections between orthogonal walls and those between a wall and timber beams.…”

Section: Numerical Simulation 51 Description Of the Numerical Modelsmentioning

confidence: 99%

Dynamic Identification Tests of 20th Century Historic Masonry Buildings in Japan

et al. 2021

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This paper discussed the application of health monitoring systems to 20th-century historic buildings. Natural disasters are major threats to monuments. They are often seismically vulnerable and require interventions. However, taking into account their historic and cultural values, it is appropriate to observe long-term behaviour before making a decision on intervention schemes. To this aim, health monitoring is considered an effective approach. In recent years, MEMS (micro-electromechanical systems) accelerometers have been attracting attention for their convenience and efficacy. Nonetheless, the reliability of MEMS accelerometers still needs to be examined for the monitoring of monuments as sufficient research contributions have not been made. This paper presented two case studies that were monitored by means of MEMS accelerometers. They were masonry structures positioned in seismic-prone regions in Japan. A number of earthquakes were detected by the accelerometers during one year of monitoring. To examine the accuracy of the adopted MEMS accelerometers, dynamic identification tests were conducted using high-sensitivity strain-gauge accelerometers and servo velocity meters. Based on responses obtained from the tests, numerical simulation was performed. Nonlinear static analysis was performed. The numerical simulation permitted the comparison of reliability among sensors and test types. This paper provided suggestions for the dynamic identification tests of heritage structures.

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“…These timber buildings have diverse connection systems, such as dovetail connections (Chang & Hsu, 2005) and Dou-Gong system. The anti-seismic performance of historic timber buildings has been extensively studied over the past 20 years (Fang et al, 2001a;Fang et al, 2001b;Fujita, Hanazato & Sakamoto, 2004;Chang, 2005;Suzuki & Maeno, 2006;Chang, Hsu & Komatsu, 2006;Chang & Hsu, 2007;Yu et al, 2008;Chang et al, 2009;Xue et al, 2015;Yeo et al, 2018;Xie, Araki & Chang, 2018), and it has been recognised that Dou-Gong systems in historic timber buildings play an important role in resisting seismic action. Dou-Gong systems are located at the top of columns to support upper structures and transmit the weight of both the structures and the roof to the columns and the foundations.…”

Section: Introductionmentioning

confidence: 99%

Static behaviour of a two-tiered Dou-Gong system reinforced by super-elastic alloy

Xie

Wang

Chang

2019

Proceedings of the Institution of Civil Engineers - Engineering

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The Dou-Gong system in Asian timber structures plays an important role in resisting seismic action. Traditional carpentry in Asia uses timber pegs to connect components, which enables relative movement between components and hence provides friction to dissipate energy in an earthquake. This method, however, has some shortcomings, such as inadequate stiffness to resist a large lateral force, and, therefore, the structures tend to exhibit permanent deformation after earthquakes. This study proposes a new technique by using super-elastic alloy bars to replace conventional wooden peg connections to enhance the seismic performance of the structures. Static pushover experiments were conducted on full-scale two-tiered Dou-Gong systems, and high-strength steel and conventional wooden pegs were used as benchmarks. The ultimate stiffness of the Dou-Gong system has shown an increase when both high-strength steel and super-elastic alloy bars were used, but only super-elastic alloy can provide a consistently high damping ratio. This technique also involves pre-strain of the super-elastic alloy, and the outcomes of this series of experiments have shown that pre-strain of the super-elastic alloy can significantly increase the damping ratio in the structure, and, hence, more energy is dissipated. The results of this paper can be used in projects of timber structures using the Dou-Gong system.

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The structural behaviour of timber joints subjected to bi‐axial bending

Cited by 10 publications

References 11 publications

Experiment on Behavior of a New Connector Used in Bamboo (Timber) Frame Structure under Cyclic Loading

Experiment on Behavior of a New Connector Used in Bamboo (Timber) Frame Structure under Cyclic Loading

Dynamic Identification Tests of 20th Century Historic Masonry Buildings in Japan

Static behaviour of a two-tiered Dou-Gong system reinforced by super-elastic alloy

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