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Quantitative Study on Wood Rot and Mathematical Modeling for Predicting Damage in Wood Structures

木材腐烂的定量研究和预测木结构损坏的数学模型

基本信息

批准号：
16360286
负责人：
SAKAMOTO Yuzo
金额：
$ 9.73万
依托单位：
The University of Tokyo
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2004
资助国家：
日本
起止时间：
2004 至 2006
项目状态：
已结题

项目摘要

Research results are composed of the following two terms.1. Experiments on wood decayPrincipal members of the investigators had visited famous laboratories in Canada and Germany and surveyed the state-of-the art researches about wood decay. On basis of these surveys, Hygro-thermal simulations were performed to predict temperature and humidity inside insulated wood-frame envelopes. Experimental conditions in temperature and humidity were defined using these simulation results. Long term experiments on wood decay had been conducted under those conditions. In these experiments, periodical observation of wood specimens regarding mould, activity of rot bacteria, color change and deformation was carried out, and measurements were also done in weight and dimension. In addition, mechanical strength, such as longitudinal compressive strength, was measured every month after drying out wood specimens2. Formulation of biological damage function on wood productsBy analyzing the above experimental results, knowledge about wood decay was systematized. New biological damage function was formulated according to that knowledge and is also a goal of this project. In the damage function, damage is expressed with durability deterioration. Furthermore the durability deterioration is indicated by degree of decay. Finally degree of decay is formulated with moisture content, time equivalent to hypha growth and so forth, which is an important result of the project. Consequently the damage function enables engineers and designers to predict degree of decay and durability deterioration in wood products numerically, if they will conduct hygro-thermal simulation in insulated envelopes and can obtain temperature, humidity and moisture content.

研究成果由以下两个方面组成.木材腐朽实验研究组主要成员曾访问加拿大和德国著名的实验室，考察了木材腐朽的研究现状。在这些调查的基础上，进行湿热模拟，以预测温度和湿度内绝缘木框架信封。利用这些模拟结果确定了温度和湿度的实验条件。在此条件下进行了木材腐朽的长期试验。在这些实验中，定期观察木材样品的霉菌、腐烂菌活性、颜色变化和变形，并进行重量和尺寸的测量。此外，机械强度，如纵向抗压强度，在干燥木材后每月测量2。木材生物损伤函数的建立通过对上述实验结果的分析，系统地认识了木材腐朽的机理。在此基础上提出了新的生物损伤函数，这也是本项目的一个目标。在损伤函数中，损伤用耐久性劣化来表示。此外，耐久性劣化由衰变程度指示。最后用含水量、相当于菌丝生长的时间等来表示腐烂程度，这是项目的重要结果。因此，损伤函数使工程师和设计人员能够预测木材产品的腐烂程度和耐久性退化的数值，如果他们将进行湿热模拟在绝缘外壳，并可以获得温度，湿度和含水量。