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An experimental and modeling study on apparent bending moduli of cross-laminated bamboo and timber (CLBT) in orthogonal strength directions

https://research.thinkwood.com/en/permalink/catalogue2914
Year of Publication
2022
Topic
Mechanical Properties
Material
CLT (Cross-Laminated Timber)
Author
Li, Hao
Wang, Brad
Wang, Libin
Wei, Yang
Organization
Nanjing Forestry University
Southwest Forestry University
Publisher
Elsevier
Year of Publication
2022
Format
Journal Article
Material
CLT (Cross-Laminated Timber)
Topic
Mechanical Properties
Keywords
Bending Performance
Modeling Analysis
Cross-laminated Bamboo and Timber
Research Status
Complete
Series
Case Study in Construction Materials
Summary
In this paper, the bending properties of a 3-ply cross-laminated bamboo and timber (CLBT), prefabricated with the bamboo mat-curtain panel and hem-fir lumber, were examined in the major and minor strength directions, and a 3-ply hem-fir cross-laminated timber (CLT) was taken as a control group. The analytical model for the sum of the orthogonal apparent bending moduli with the two types of layer classifications were proposed, and the two kinds of contribution models were developed to analyze the apparent bending modulus variation behavior of the CLBT and CLT panels in the major and minor strength directions. The experimental results showed that since the CLBT group had more internal orthogonal structures, its difference in the bending properties between the major and minor strength directions was lower than that of the CLT group. Furthermore, the proposed contribution models quantitatively analyzed the relationship between the apparent bending moduli of the CLBT and CLT panels and the corresponding composition layer characteristics. The contribution model to characterize the apparent bending modulus in major and minor strength directions demonstrated good agreement with the test results. Based on this model interpreted by three-dimensional figures, the contribution variation characteristics in the major and minor strength directions were revealed.
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Deflection test and modal analysis of lightweight timber floors

https://research.thinkwood.com/en/permalink/catalogue3051
Year of Publication
2021
Topic
Acoustics and Vibration
Mechanical Properties
Author
Zhao, Xinyue
Huang, Yujie
Fu, Haiyan
Wang, Yunlu
Wang, Zheng
Sayed, Usama
Organization
Nanjing Forestry University
Publisher
Elsevier
Year of Publication
2021
Format
Journal Article
Topic
Acoustics and Vibration
Mechanical Properties
Keywords
Lightweight Timber Structure Building
Floor Structure
Static Load Test
Test Mode
Calculation Mode
Building Comfort
Research Status
Complete
Series
Journal of Bioresources and Bioproducts
Summary
In order to meet the objective requirements of the safety and comfort of the modern lightweight timber floors, and strengthen the research on the coupling performance of the lightweight timber floors vibration characteristics and the building comfort, this article discusses the floor of a two-story prefabricated lightweight timber building demonstration house. In this paper, the floor structure of a two-story light-weight wooden house has been carried out on structural calculation modal and experimental modal, static uniform load and concentrated load deflection value testing. The evaluation of the deflection value of the floor structure, the mode shape, the coupling of the fundamental frequency mode parameters, and the vibration comfort were also studied. The results show that the fundamental frequency simulation value, one-way modal test value and two-way modal test value of the floor structure all meet the requirements of BS-6472 (BS6472-1:2008). That is, the floor structure is not lower than 8 Hz design requirements, and meets the frequency of BS-6472(BS6472-1:2008). The weighted root mean square acceleration is lower than the requirement of 0.45 m/s2; the first three natural frequencies of the floor structure calculated by the finite element simulation are 16.413, 31.847 and 48.921 Hz, and the fundamental frequency mode is the bending vibration in the length and width directions. The second order is the bending mode in the length direction, and the third order is the bending mode in the width direction. The fundamental frequency of the two-way modal test of the floor structure is the first-order bending mode in the X direction; and the second-order natural frequency is the second-order bending vibration shape in the X direction. when the uniform load is mainly the weight of floor own, the simulated maximum deflection value is 1.0658 mm; the simulation is performed according to the standard value of 0.566 kN/m for the uniform load of the floor design, and the simulation is the largest. The maximum deflection value of the simulated floor is 1.47383 mm at its midpoint, which meets the requirements of National Building Code of Canada-2015 (NBCC). The maximum deflection limit of the light wood structure floor system is lower than 3 m and the maximum deflection limit is 2 mm; the six deflection value test lines simulated under a concentrated load of 1 kN all present a parabolic distribution and are symmetrical. The above results has engineering application value for promoting the research on the vibration characteristics of the fabricated lightweight timber floors structure and its optimization design.
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Experimental Study on Timber-Lightweight Concrete Composite Beams with Ductile Bolt Connectors

https://research.thinkwood.com/en/permalink/catalogue3063
Year of Publication
2021
Topic
Mechanical Properties
Material
Timber-Concrete Composite
Application
Beams
Floors
Author
Hu, Yafeng
Wei, Yang
Chen, Si
Yan, Yadong
Zhang, Weiyao
Organization
Nanjing Forestry University
Editor
Corradi, Marco
Publisher
MDPI
Year of Publication
2021
Format
Journal Article
Material
Timber-Concrete Composite
Application
Beams
Floors
Topic
Mechanical Properties
Keywords
Composite Beam
Lightweight Concrete
Bending Performance
Shear Connections
Research Status
Complete
Series
Materials
Summary
A timber–lightweight-concrete (TLC) composite beam connected with a ductile connector in which the ductile connector is made of a stainless-steel bolt anchored with nuts at both ends was proposed. The push-out results and bending performance of the TLC composite specimens were investigated by experimental testing. The push-out results of the shear specimens show that shear–slip curves exhibit good ductility and that their failure can be attributed to bolt buckling accompanied by lightweight concrete cracking. Through the bending tests of ten TLC composite beams and two contrast (pure timber) beams, the effects of different bolt diameters on the strengthening effect of the TLC composite beams were studied. The results show that the TLC composite beams and contrast timber beams break on the timber fiber at the lowest edge of the TLC composite beam, and the failure mode is attributed to bending failure, whereas the bolt connectors and lightweight concrete have no obvious breakage; moreover, the ductile bolt connectors show a good connection performance until the TLC composite beams fail. The ultimate bearing capacities of the TLC composite beams increase 2.03–3.5 times compared to those of the contrast beams, while the mid-span maximum deformation decrease nearly doubled.
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Is engineered wood China's way to carbon neutrality?

https://research.thinkwood.com/en/permalink/catalogue3105
Year of Publication
2022
Topic
Environmental Impact

A Review of the Methods for Predicting the Effective In-Plane Shear Modulus of Cross-Laminated Timber (CLT)

https://research.thinkwood.com/en/permalink/catalogue3091
Year of Publication
2021
Topic
Mechanical Properties
Material
CLT (Cross-Laminated Timber)
Application
Shear Walls
Author
Khan, Mehsam Tanzim
Chui, Ying Hei
Huang Dongsheng
Organization
University of Alberta
Nanjing Forestry University
Publisher
Hindawi
Year of Publication
2021
Format
Journal Article
Material
CLT (Cross-Laminated Timber)
Application
Shear Walls
Topic
Mechanical Properties
Keywords
In-Plane Shear
Effective Shear Modulus
Research Status
Complete
Series
Advances in Civil Engineering
Summary
Cross-laminated timber (CLT) is a type of engineered wood product that offers both high in-plane and out-of-plane load-bearing capacity. It is slowly becoming an alternative material for building high-rise structures. However, there is no current standard or regulation for determining the shear modulus of CLT under in-plane loading condition, which is a very important property for its use as structural members. Few methods have been proposed over the last decade to determine the in-plane shear modulus of CLT. Almost all of the methods proposed until now have their strengths and weaknesses. In this paper, some of the prominent methods for determining the in-plane shear modulus of CLT are described and analysed. The descriptions along with the critical discussions will facilitate a better understanding and might pave the way to further enhancements of the method(s) to determine the in-plane shear modulus of CLT.
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Sound Insulation Performance of Structural Wood Wall Integrated with Wood Plastic Composite

https://research.thinkwood.com/en/permalink/catalogue3067
Year of Publication
2019
Topic
Acoustics and Vibration
Material
Other Materials
Application
Walls
Author
Yang, Xiaojun
Tang, Xiaolan
Ma, Lan
Sun, Youfu
Organization
Nanjing Forestry University
Publisher
Elsevier
Year of Publication
2019
Format
Journal Article
Material
Other Materials
Application
Walls
Topic
Acoustics and Vibration
Keywords
Wood Plastic Composite
WPC Building Wall
Sound Insulation Performance
Research Status
Complete
Series
Journal of Bioresources and Bioproducts
Summary
The sound insulation performance is an important technical index for evaluating the physical property of the building wall. Three kinds of structural wood walls integrated with wood plastic composite (WPC) were designed. And the sound insulation performance of the walls was studied. The results showed that for the wall that constructed by the WPC as the wall studs, compared with the one that constructed by the pine wood as the wall studs, the deviation of their sound insulation was lower than ± 3 dB. The wall's external panel material had significant effect on the wall's sound insulation property, and the contribution of the wood-plastic panel to the sound insulation was much higher than that of the polyvinyl chloride (PVC) plastic hanging board. The surrounding sealing quality of the wall's external panel material had an important influence on the sound insulation effect of the building wall, and the panel of the wood plastic interior wall had less influence on the sound insulation performance of the wall. Taking the sound-absorbing cotton or non-woven fabric as elastic strips was an effective technical measure to improve the sound insulation performance of the walls. The sound insulation was improved by 2.4 dB and 3.1dB respectively after the correction of pink noise spectrum, and increased by 2.8 dB and 3.6 dB respectively after the correction of traffic noise spectrum.
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6 records – page 1 of 1.