重组竹受弯短期蠕变性能试验  

Experiment on Short-term Bending Creep Performance of Bamboo Scrimber

作　　者：陈思 魏洋[1] 赵鲲鹏 杭晨 赵康[1] CHEN Si;WEI Yang;ZHAO Kun-peng;HANG Chen;ZHAO Kang(College of Civil Engineering,Nanjing Forestry University,Nanjing 210037,Jiangsu,China)

机构地区：[1]南京林业大学土木工程学院,江苏南京210037

出　　处：《建筑科学与工程学报》2021年第5期83-90,共8页Journal of Architecture and Civil Engineering

基　　金：国家自然科学基金项目(51778300,51208262);江苏省自然科学基金项目(BK20191390);江苏省重点研发计划项目(BE2020703);江苏省“六大人才高峰”资助项目(JZ-017);江苏省“青蓝工程”资助项目(QL2020)。

摘　　要：为研究重组竹的受弯蠕变性能,对9个不同荷载水平下的重组竹试件进行受弯蠕变试验,得到了重组竹蠕变位移-时间的关系曲线,分析了蠕变增长率和受弯相对蠕变的变化规律。根据试验结果分析了重组竹受弯蠕变的弹性变形、黏弹性变形和黏性变形的变化规律,确定了不同荷载水平下Burgers模型的参数,进一步推导了Burgers模型参数随荷载水平的变化规律,提出了考虑荷载水平的重组竹受弯蠕变预测模型,模型预测结果与试验曲线趋势吻合较好。研究结果表明:重组竹受弯蠕变试件的蠕变变形随着时间的推移而增加,在较低的荷载水平作用下,变形速率较低,曲线整体较平缓稳定,在较高的荷载水平作用下,蠕变变形速率较快;重组竹受弯蠕变增长率随着时间的增加而逐渐增大,其增长速率则呈现减速状态。In order to study the bending creep performance of bamboo scrimber,creep tests were carried out on nine bamboo scrimber specimens under different load levels.The relation curve between the creep displacement and time of bamboo scrimber was obtained,and the variation law of creep growth rate and bending creep was obtained.According to the results,the variation rules of elastic deformation,viscoelastic deformation and viscous deformation in the bending creep test were analyzed,and the parameters of Burgers model with different load levels were determined,then the variation law of parameters influenced by load level was derived.A model for predicting bending creep of bamboo scrimber was proposed,and the results were in good agreement with the trend of the test curves.The study results show that the creep deformation increases with the passage of time.Under the action of lower load level,the deformation rate is low and the curve is gentle and stable as a whole.Under the action of higher load level,the creep deformation rate is faster.The growth rate of bending creep of bamboo scrimber increases gradually with the increase of time,and its growth rate presents a decelerating state.

关 键 词：重组竹 短期蠕变 荷载水平 BURGERS模型 

分 类 号：TU366.3[建筑科学—结构工程]