持续荷载作用下PVC防水卷材的应力松弛特性及其影响因素  

Study on Behavior of Stress Relaxation of PVC Waterproofing Membrane under Sustained Load

作　　者：杨杨[1] 余春春[2] 许四法[1] 张文华[1] 

机构地区：[1]浙江工业大学建筑工程学院,浙江杭州310032 [2]丽水学院机械电子与建筑工程学院,浙江丽水323000

出　　处：《中国建筑防水》2011年第1期8-12,共5页China Building Waterproofing

摘　　要：研究了PVC防水卷材在持续荷载作用下的应力松弛特性。自行设计了应力松弛试验装置和试验方法,研究了不同温度和不同初始拉伸率条件下,卷材的应力损失率和持荷时间的关系曲线。结果表明:PVC卷材表现出快速的应力松弛特性。随着初始拉伸率的增大,卷材的应力松弛速度加快、应力损失率加大;随着温度的升高,卷材的最终应力损失率也增大。This article studies the behavior of stress relaxation of PVC waterproofing membrane under sustained load and introduces the experimental equipment and method developed for the study.The plots of stress reduction rate of the membrane against time load sustained under various temperatures and initial tensile stress were made.The results show that PVC exhibits rapid stress relaxation.As the initial tensile stress increases the stress relaxation quickens and stress reduction rate increases.With rise of the temperature the final stress reduction of the membrane gets more.

关 键 词：PVC防水卷材 应力松弛 应力损失率 初始拉伸率 温度 

分 类 号：TU573[建筑科学—建筑技术科学] TU502.6