Strain method for synchronous dynamic measurement of elastic, shear modulus and Poisson’s ratio of wood and wood composites

Wang, Zheng; Xie, Wenbo; Wang, Zhiheng; Cao, Yu

doi:10.1016/j.conbuildmat.2018.06.139

Cited by 33 publications

(19 citation statements)

References 5 publications

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“…The investigation on timber structures started much earlier, and the researchers have considered many impact factors. Until now, there are still many comprehensive experiments and theoretical basis appearing [66], [67], [68], [69], [70]. The structural form of engineered bamboo structures is analogous to that of timber structures.…”

Section: Study On Calculation Methods Of Engineered Bamboo Bolted Jointsmentioning

confidence: 99%

Review of connections for engineered bamboo structures

Hong

Xiong

et al. 2020

Journal of Building Engineering

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Bamboo is a green building material that is environmentally friendly and has great development value. However, the limited mechanical properties and heterogeneous dimensions of natural bamboo poles curb the application of bamboo in building structures. A transverse section of engineered bamboo is regular and compact, and its mechanical properties are stable, which can meet the requirements for physical and mechanical properties of materials in modern building structures. Though application of engineered bamboo has just started, it is of great significance to study the connection performance and corresponding influence factors for popularization and application of modern bamboo structures. This paper is focused on a review of research progress for connections in engineered bamboo structures. Firstly, a study on embedding strength and the performance of bolted joints is presented, including calculation methods described with a proposal for future development of standards suitable for the characteristics of engineered bamboo materials. Secondly, research on carpentry joints is introduced, namely tenonmortise joints, nail joints and truss plate joints. Finally, some engineering examples are briefly introduced. This work can provide a reference for further research on connections in engineered bamboo structures.

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Section: Study On Calculation Methods Of Engineered Bamboo Bolted Jointsmentioning

confidence: 99%

Review of connections for engineered bamboo structures

Hong

Xiong

et al. 2020

Journal of Building Engineering

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show abstract

“…To illustrate the correctness of the test, the suspension method (Wang et al 2015(Wang et al , 2018(Wang et al , 2019 was used for verification with a total of 20 samples. This method has proven to be accurate (Wang et al 2015(Wang et al , 2018(Wang et al , 2019. Figure 3 shows that the elastic modulus measured by the two test methods has a good correlation.…”

Section: Fig 2 Free Board Sponge Placement Spectrummentioning

confidence: 99%

“…The most commonly used statistical analysis of data is based on the normal distribution. This paper used the frequency method to accurately measure the elastic modulus (Wang et al 2012(Wang et al , 2018(Wang et al , 2019Xie et al 2019;Wargua et al 2020) and applied the Weibull distribution to analyze LVL elastic modulus data. The linear fitting and K-S methods were applied to the elastic modulus data of the sub-sample.…”

Section: Introductionmentioning

confidence: 99%

Dynamic test of laminated veneer lumber elastic modulus and its probability distribution

Xie¹,

Wang²,

Zhang³

et al. 2021

BioRes

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The vibrational frequency method was used to measure the elastic modulus of laminated veneer lumber (LVL), and the feasibility of using Weibull distribution to analyze the elastic modulus data of LVL was considered. Samples were randomly selected as test pieces at the factory. The sponge support structure was used to realize the free beam state, and the modal test results verified the accuracy of realizing the free beam. Under transient excitation, the elastic modulus of the specimen was obtained by testing the first-order bending frequency. The Weibull distribution fitting test, Weibull distribution K-S test, and normal distribution K-S test were used for the test data. The probability of LVL elastic modulus was calculated under a given value. The results showed that the LVL elastic modulus did not obey the two-parameter Weibull distribution (Eu=0). The LVL elastic modulus fit to the three-parameter Weibull distribution (Eu) was greater than half of the minimum test value and the normal distribution. When 9 GPa and 8 GPa were used as the setting values of Eu, the calculated probability value was relatively stable. At this time, Eu was 81% and 92% of the minimum elastic modulus 9.815 GPa. Therefore, it was recommended to use 80% to 90% of the minimum value of the measured data as the setting value of the position parameter Eu. The three-parameter Weibull distribution and the normal distribution calculated LVL elastic modulus have the same probability under the given value.

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“…Mechanical performance test of base material of floor cover Seven samples of OSB board, maple floor and SPF each with an average moisture content of 12%, 9% and 12% were randomly selected to test the elastic modulus, shear modulus, and Poisson's ratio (Wang et al 2018). Table 2 shows the mechanical properties of the tested materials.…”

Section: Calculation Modementioning

confidence: 99%

Vibration test and comfort analysis of environmental and impact excitation for wooden floor structure

Ding

Zhang

Wang

et al. 2020

BioRes

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To meet consumer requirements for comfort in wooden structure construction, test mode methods (the environmental excitation method and impact excitation method) have been used to test six measuring points of the flooring in a two-story residential light-wood structure. The following tests were performed: the fundamental frequency test of floor structure under environmental excitation mode; the ball excitation dynamic vibration test of single and rhythmic running of a basketball and tennis ball under impact excitation mode; and the pedestrian dynamic vibration test of jump, single-step, steady walking, and rhythmic movement. The comfort analysis was validated based on the test results of peak value and effective value of fundamental frequency, acceleration, and speed. ANSYS was used to verify the calculation mode of the floor structure. Research showed that the fundamental frequencies of the building structure obtained through the calculation mode and the test mode were consistent, and both were higher than 4.5 Hz. The maximum measured acceleration peak value under the impact excitation mode was 407.2 mm/s2. The maximum speed peak value was 5.606 mm/s. The maximum acceleration effective value (RMS) was less than 450 mm/s2. The floor structure results met the building comfort requirements. The research has value in engineering applications, as it advances understanding concerning the vibration characteristics and comfort optimization of light-wood frame construction.

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Strain method for synchronous dynamic measurement of elastic, shear modulus and Poisson’s ratio of wood and wood composites

Cited by 33 publications

References 5 publications

Review of connections for engineered bamboo structures

Review of connections for engineered bamboo structures

Dynamic test of laminated veneer lumber elastic modulus and its probability distribution

Vibration test and comfort analysis of environmental and impact excitation for wooden floor structure

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