shht建筑材料学报
JOURNAL OF BUILDING MATERIALS
JOURNAL OF BUILDING MATERIALS建筑材料学报1007‑962931‑1764/TU《建筑材料学报》杂志编辑部200092,上海市杨浦区四平路1239号 同济大学材料科学与工程学院10079629(2023)1011171210.3969/j.issn.1007-9629.2023.10.010(10-10)20229783-李TU366.2A专题综述Review and Summarization层板销接木性能研究进展Performance of Dowel Laminated Timber付海燕FUHaiyan何敏娟HEMinjuan*同济大学 土木工程学院,上海200092College of Civil Engineering, Tongji University, Shanghai200092, China何敏娟(1963—),女,江苏海门人,同济大学教授,博士生导师,博士.E‑mail:hemj@tongji.edu.cn
Dowel laminated timber (DLT) is only composed of wood dowel and laminated timber of a kind of non‑glue and non‑nail, nearly full solid wood engineering wood products. DLT can be used as beams, walls and floors. It has the characteristics of the material economy, green and low carbon, and a high degree of prefabrication. A brief overview of DLT was given from the aspects of construction and classification, and the performance research results of DLT in recent years in terms of the dowel, dowel joints, and components are systematically reviewed, including the embedment performance of dowel‑laminate, shear performance of dowel joints, bending performance of DLT beams, vibration characteristics of DLT plates, et al. On this basis, the shortcomings in the performance research of DLT are summarized, and the fundamental problems to be solved in the study of DLT are put forward.
Comparison of mechanical properties of part wood species before and after compression treatment
Object
Method
Before modification
After modification
ρ/(g·cm-3)
σm/MPa
E/GPa
ρ/(g·cm-3)
σm/MPa
E/GPa
Populus euramericana[9]
Hot‑humidity compression①
0.478
57.7
5.4
0.738
126.0
10.8
Cunninghamia lanceolata[10]
Hot compression②
0.362
74.3
8.2
0.692
137.0
20.7
Picea sitchensis car[11]
Hot compression③
0.458
90.0
14.0
0.606-0.800
96.0-115.0
25.0-31.0
Note:1: ①The compressed wood was first softened by steam at 130 ℃ for 40 to 80 min. Then the fixed compression molding process, control temperature of 100 ℃, unit pressure 5 MPa, and compression rate of 50%; Finally, the heat treatment was carried out at 180 ℃, maintained for 40 min, and then forced cooling. ②The optimal process conditions were the compression rate controlled at 50%-60%, compression time at 20-30 min, and hot pressing temperature at 180-200 ℃. ③The compression treatment was first soaked in water at 20 ℃ for 2 days. Then the fixed compression molding process, control temperature 180 ℃, compression rate of 33%-67%.2: ρ is the density; σm is the bending strength; E is the flexural elastic modulus.
欧洲屈服理论模式(European yield model,EYM)中有2种木销连接延性破坏模式,分别为层板销槽承压屈服(Ⅰm和Ⅰs)、木销和层板销槽承压同时屈服(Ⅲs和Ⅳ). 木销连接的力学性能主要受层板销槽承压强度与销钉的抗弯承载力影响[32]. 销槽承压强度是欧洲屈服理论模式中的重要参数之一,也是评价层板销连接承载力的技术指标之一[33‑34]. 当前销槽承压研究多为钢销-层板[35‑36],木销-层板销槽承压研究较少. 王必林[24]采用半孔试验法对压缩杨木销-樟子松胶合木层板进行了顺纹和横纹销槽承压试验,结果表明:压缩木销-胶合木层板顺纹和横纹销槽承压强度分别为29.37~36.30 MPa和16.59~19.54 MPa,顺纹销槽承压强度明显优于横纹;欧洲木结构规范BS EN383《Determination of embedding strength and foundation values for dowel type fasteners》和美国木结构规范ASTMD 5764‑97a(2013)《Standard test method for evaluating dowel‑bearing strength of wood and wood‑based products》均能较为准确地预测压缩木销-胶合木层板的顺纹销槽承压强度(绝对误差积分分别5.15%和8.52%),而对于横纹销槽承压强度存在较大预测误差(绝对误差积分分别19.92%和27.25%).
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