摘要
采用握钉力试验方法对钉结合蠕变性能进行了研究。结果表明:钉结合强度取决于木材与螺钉的咬合程度和摩擦力;Burger模型可较精确地模拟松木握钉的短期蠕变性能;湿环境下握钉蠕变量显著大于干环境,温度及相对湿度都是影响蠕变的重要因素;应力水平越高握钉蠕变量越大;高湿环境及高应力水平下的握钉蠕变速率最大,在较短时间内便出现握钉破坏;为安全考虑,建议长期使用中应使螺钉握钉力控制在极限握钉力的40%以内。
Screw connection＇s creep performance has been studied through the experimentul method of screw holding power. The results show that the intensity of screw connection lies in the occlusion level and the force of friction between wood and screw. Burger mode can precisely simulate Pinus Stp. short-term creep performance. In the wet condition, the amount of creep is apparently larger than that in dry condition. Temperature and relative humidity are two important factors that influence creep. The higher stress level is, the larger amount of screw holding creep. Creep rate is the highost in the wet cnndition and high stress level. Therefore, screw connection becomes invalid in short time. Under the consideration of safety, screw holding power should be controlled within 40% of the maximum stress level in the long term.
出处
《福建林学院学报》
CSCD
北大核心
2012年第1期93-96,共4页
Journal of Fujian College of Forestry
基金
江苏高校优势学科建设工程资助项目(PAPD 2011-07)
关键词
木构件
螺钉结合
蠕变性能
wood structure members
screw connection
creep performance
作者简介
杨小军（1978-）。男，讲师，博士研究生，从事木材加工及木结构建筑工程理论与技术研究。
孙友富（1957-）,男,教授,博士生导师，从事木材加工及木结构建筑工程理论与技术研究。
