Mokuzai Gakkaishi最新文献_第7页

Estimation of Creep Limit of Screw Joints between Timber and Structural Plywood under Constant Shear Loading 恒定剪切载荷下木材与结构胶合板螺纹接头蠕变极限的估算

IF 0.3 4区农林科学

Mokuzai Gakkaishi Pub Date : 2020-10-25 DOI: 10.2488/jwrs.66.187

Keita Ogawa, K. Kobayashi

引用次数: 1

Effect of Painting Treatment on Visible Light Reflection Considering Cellular Structure Inside Wood 考虑木材内部细胞结构的油漆处理对可见光反射的影响

IF 0.3 4区农林科学

Mokuzai Gakkaishi Pub Date : 2020-10-25 DOI: 10.2488/jwrs.66.202

K. Ohshima, Hiroyuki Sugimoto, M. Sugimori, Emika Sawada

{"title":"Effect of Painting Treatment on Visible Light Reflection Considering Cellular Structure Inside Wood","authors":"K. Ohshima, Hiroyuki Sugimoto, M. Sugimori, Emika Sawada","doi":"10.2488/jwrs.66.202","DOIUrl":"https://doi.org/10.2488/jwrs.66.202","url":null,"abstract":"In order to clarify the mechanism of change in reflectance of visible light due to painting treatment, X-ray CT observations of the internal structure of the material and measurements of the optical properties of visible light with a spectrophotometer were performed for two types of grain of hinoki cypress (Chamaecyparis obtusa) with various amounts of paint. In the observation of CT images, penetration of the paint into the material was not confirmed in the edge-grain samples, whereas that was confirmed in the end-grain samples. In addition, the permeability of the paint of the end-grain samples was quantified, and that was in a positive relationship with the paint amount. In the optical characteristics measurements, in the medium to long wavelength range, there was no increase in absorption but a decrease in reflectance due to an increase of transmittance. There was also a decrease in reflectance due to an increase in the amount of penetration. From the above results, it was shown that the mechanism of lightness reduction by the clear painting treatment is affected by an increase in the value of the transmittance in the medium to long wavelength regions due to differences in the amount of paint penetration.","PeriodicalId":49800,"journal":{"name":"Mokuzai Gakkaishi","volume":" ","pages":""},"PeriodicalIF":0.3,"publicationDate":"2020-10-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47938080","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Effect of Supporting and Loading Locations on the Shear Strength of Solid Wood Obtained by Asymmetric Four-point Bending Tests 支承和加载位置对非对称四点弯曲实木抗剪强度的影响

IF 0.3 4区农林科学

Mokuzai Gakkaishi Pub Date : 2020-10-25 DOI: 10.2488/jwrs.66.209

H. Yoshihara, Masahiro Yoshinobu

引用次数: 1

Classification of Wood Species Frequently Used for Modern and Ancient Buildings Utilizing Near-Infrared Spectroscopy with Multivariate Analysis and Enhancement of Its Generalization Performance 近红外光谱多元分析法对现古建筑常用树种的分类及其推广性能的提高

IF 0.3 4区农林科学

Mokuzai Gakkaishi Pub Date : 2020-07-25 DOI: 10.2488/jwrs.66.171

Y. Kita, Suyako Tazuru, Hironobu Takeshita, J. Sugiyama

引用次数: 0

Study of Single Shear Performance of Nailed Joints for Structural Utilization of MDF II. 中密度纤维板结构应用钉接节点单次抗剪性能研究。

IF 0.3 4区农林科学

Mokuzai Gakkaishi Pub Date : 2020-07-25 DOI: 10.2488/jwrs.66.128

Ryutaro Sudo, H. Kawahara, Y. Ochiai, K. Aoki, Masahiro Inayama

{"title":"Study of Single Shear Performance of Nailed Joints for Structural Utilization of MDF II.","authors":"Ryutaro Sudo, H. Kawahara, Y. Ochiai, K. Aoki, Masahiro Inayama","doi":"10.2488/jwrs.66.128","DOIUrl":"https://doi.org/10.2488/jwrs.66.128","url":null,"abstract":"There are two formulas for the allowable resistance of nailed joints. One is based on the European Yield Theory (EYT) and the other contains the head diameter of the nail as a parameter. In addition, there are a few cases where the behavior of the load rising after yield is considered theoretically. In this paper, we estimated yield and maximum load of nailed joints with MDF. The yield load was estimated by the EYT formula considering the moment generated by nail head rotation. The maximum load was estimated by the existing formula of screw joints considering a “rope effect”. As a result, the estimation accuracy was increased by the improved EYT formula, taking into consideration the moment generated by nail head rotation. It was also shown that the rope effect of nailed joints can be estimated by the formula for screw joints. On the other hand, it was suggested that the bearing strength of the range between the plastic hinge and the tip of the nail might affect the gap of yield strength between the calculated and the experimental values. It was also suggested that, at the maximum load, nail withdrawal strength might be underestimated and nail-head pullthrough strength be overestimated compared to actual values.","PeriodicalId":49800,"journal":{"name":"Mokuzai Gakkaishi","volume":"1 1","pages":""},"PeriodicalIF":0.3,"publicationDate":"2020-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41557087","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Temporal Change in Surface-strain Distribution of Sugi (Cryptomeria japonica) Square Timber during High-Temperature Drying 杉方材高温干燥过程中表面应变分布的时间变化

IF 0.3 4区农林科学

Mokuzai Gakkaishi Pub Date : 2020-07-25 DOI: 10.2488/jwrs.66.140

Tomoya Murano, N. Fujimoto, T. Nakao, Hiroki Sakagami, Kenei Watanabe

引用次数: 0

Effects of Climate Factors on the Tree-ring Structure of Cryptomeria japonica in Central Japan 气候因子对日本中部柳杉树轮结构的影响

IF 0.3 4区农林科学

Mokuzai Gakkaishi Pub Date : 2020-07-25 DOI: 10.2488/jwrs.66.117

Y. Hirano, T. Saitoh, E. Fukatsu, Hajime Kobayashi, H. Muraoka, Yudong Shen, K. Yasue

{"title":"Effects of Climate Factors on the Tree-ring Structure of Cryptomeria japonica in Central Japan","authors":"Y. Hirano, T. Saitoh, E. Fukatsu, Hajime Kobayashi, H. Muraoka, Yudong Shen, K. Yasue","doi":"10.2488/jwrs.66.117","DOIUrl":"https://doi.org/10.2488/jwrs.66.117","url":null,"abstract":"We investigated the effects of climate factors on tree-ring structure of (cid:9479)(cid:9526)(cid:9533)(cid:9524)(cid:9528)(cid:9523)(cid:9521)(cid:9513)(cid:9526)(cid:9517)(cid:9509)(cid:9444)(cid:9518)(cid:9509)(cid:9524)(cid:9523)(cid:9522)(cid:9517)(cid:9511)(cid:9509) in central Japan. We collected cores from 33 plantation trees in the Takayama evergreen coniferous forest site at Gifu University and measured annual ring width （RW）, annual mean density （RD）, earlywood width （EW）, latewood width （LW）, earlywood density （ED） and latewood density （LD） by X-ray densitometry. We also calculated annual ring weight growth （RWG） by multiplying RW and RD. We developed seven residual chronologies of the parameters of tree-ring structure by a dendroecological method. Pearsonʼs correlation analysis was applied to assess relationships among the chronologies, and relationships between the chronologies and climatic factors. EW showed significant positive correlations with RW and RWG. Moreover, EW showed significant positive correlation with the temperature current from March to April. These results indicate that EW is the most dominant factor which regulates RW and RWG of (cid:9479)(cid:9458)(cid:9444)(cid:9518)(cid:9509)(cid:9524)(cid:9523)(cid:9522)(cid:9517)(cid:9511)(cid:9509)(cid:9458) It is suggested that EW increases by the temperature rise of early spring before reactivation of cambium activity, and subsequently RW and RWG will increase.","PeriodicalId":49800,"journal":{"name":"Mokuzai Gakkaishi","volume":" ","pages":""},"PeriodicalIF":0.3,"publicationDate":"2020-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44044374","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Evaluation of Greenhouse Gas Emissions Associated with Lumber Products from Sawmills in Mie Prefecture, Japan 日本三重县锯木厂木材产品相关温室气体排放评估

IF 0.3 4区农林科学

Mokuzai Gakkaishi Pub Date : 2020-07-25 DOI: 10.2488/jwrs.66.161

Yuki Fuchigami, Takahisa Nakai

引用次数: 0

Strength and Stress of the Strapped Adhesive Joints made of Hinoki Cypress and Bamboo Plate under Tensile Loadings 拉伸载荷作用下松柏竹板粘结接头的强度和应力

IF 0.3 4区农林科学

Mokuzai Gakkaishi Pub Date : 2020-07-25 DOI: 10.2488/jwrs.66.148

Y. Tsuchiya, N. Nakayama, I. Higuchi

{"title":"Strength and Stress of the Strapped Adhesive Joints made of Hinoki Cypress and Bamboo Plate under Tensile Loadings","authors":"Y. Tsuchiya, N. Nakayama, I. Higuchi","doi":"10.2488/jwrs.66.148","DOIUrl":"https://doi.org/10.2488/jwrs.66.148","url":null,"abstract":"In the present study, new high-performance strapped adhesive plates comprising of hinoki cypress (Chamaecyparis obtusa) and bamboo (Phyllostachys heterocycla) were investigated. Such plates are expected to find applications in making furniture or house wall construction. Two test set-up were performed, single-strap joint and double-strap joint. In the single-strap joint set-up, one bamboo plate was glued to one side of two abutting hinoki plates. Two thickness bamboo plate variables were tested, using 4 and 2 mm. On the other hand, in the double-strap joint set-up, two identical size bamboo plates were glued to both side of the two abutting plates. Two thickness bamboo plate variables were also tested, 4 and 2 mm. In all set-up, the hinoki plates were not bonded to each other. The joints were subjected to tensile strength tests until peeling, and the results were compared. In addition, the stress and strain were calculated using an elastic and orthotropic finite element method (FEM). It was found that the tensile load at rupture for a double-strap joint was not affected by the thickness of the bamboo plates. On the other hand, for a single-strap joint the thickness of the bamboo plates affects the tensile load at rupture. When the single-strap joint with thin bamboo plate was ruptured, the tensile load was larger than that of the more rigid thick bamboo plate. It was found that the stress around the adhesive layer of the joint with lower rigidity plate is smaller by flexibly deforming the bonded part under tensile loadings.","PeriodicalId":49800,"journal":{"name":"Mokuzai Gakkaishi","volume":" ","pages":""},"PeriodicalIF":0.3,"publicationDate":"2020-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45277549","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

The Effects of Veneer Selection by Radial Location in Logs on Strength Properties of LVL in Japanese Larch (Larix kaempferi) Planted in Hokkaido 木材径向定位选择贴面对北海道日本落叶松LVL强度特性的影响

IF 0.3 4区农林科学

Mokuzai Gakkaishi Pub Date : 2020-04-25 DOI: 10.2488/jwrs.66.93

Naoyuki Furuta, Kamii Nakamura, Y. Hirabayashi, J. Miyazaki, Kazushige Matsumoto

{"title":"The Effects of Veneer Selection by Radial Location in Logs on Strength Properties of LVL in Japanese Larch (Larix kaempferi) Planted in Hokkaido","authors":"Naoyuki Furuta, Kamii Nakamura, Y. Hirabayashi, J. Miyazaki, Kazushige Matsumoto","doi":"10.2488/jwrs.66.93","DOIUrl":"https://doi.org/10.2488/jwrs.66.93","url":null,"abstract":"The aim of this study was to examine the effect of the radial location of veneer on the strength properties of laminated veneer lumber (LVL) in Japanese larch grown in Hokkaido. We manufactured LVL using veneers taken from different radial locations in logs, and then examined their strength properties using bending and horizontal shear tests. In addition, we examined how annual ring width of the logs influences the modulus of elasticity of both the logs and the veneers. Our results suggested that there was a significant negative correlation (p < 0.01) between the average annual ring width and the modulus of elasticity of the logs. The modulus of elasticity of veneers (EV) increased as distance from the center of the veneer lathe spindle increased, and average EV was higher for logs with lower average annual ring width. In addition, we compared the strength properties of LVL composed of veneers sourced from the outer part of logs (>12 cm from the center of the veneer lathe spindle) with that sourced from the inner part of logs (<10 cm from the center of the veneer lathe spindle). LVL composed of the outer veneers was stronger than that composed of the inner veneers; 53% higher in modulus of elasticity, 65% higher in bending strength, and 26% higher in nominal shear strength. These results indicate that veneer sorting by radial location in logs is effective.","PeriodicalId":49800,"journal":{"name":"Mokuzai Gakkaishi","volume":" ","pages":""},"PeriodicalIF":0.3,"publicationDate":"2020-04-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45370940","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0