建筑用PVC膜材应力松弛性能研究  

Study on Stress Relaxation Properties of PVC Membrane

作　　者：孟雷[1] 吴明儿[1] 

机构地区：[1]同济大学建筑工程系,上海200092

出　　处：《建筑材料学报》2013年第5期919-922,共4页Journal of Building Materials

基　　金：国家自然科学基金资助项目(50778129;90815003)

摘　　要：对建筑用PVC(聚氯乙烯)膜材进行单轴和双轴应力松弛试验.采用Prony级数模拟单轴应力松弛,建立单轴和双轴应力松弛拟合方程.结果表明:单轴经、纬向应力松弛量受初始应力影响较小;不同经、纬向初始应力比下,双轴经、纬向应力松弛量变化较小;双轴经向应力松弛量高于单轴经向应力松弛量,而双轴纬向应力松弛量则低于单轴纬向应力松弛量.Prony级数可以有效模拟单轴应力松弛;在单轴应力松弛拟合方程中引入调整参数,可以较好地模拟双轴应力松弛.The uniaxial and biaxial stress relaxation tests of PVC（polyvinyl chloride） membrane were car- ried out. The uniaxial stress relaxation was simulated by Prony series. The fitting equations of uniaxial and biaxial stress relaxation were established. The results show that the initial stresses have little effect on the uniaxial stress relaxation in the warp and weft direction; under different initial stress ratio of warp di- rection to weft direction, the biaxial stress relaxation values in warp and weft direction change a little; the biaxial stress relaxation values are larger than the uniaxial stress relaxation values in warp direction, whereas results in weft direction are opposite. It is found that the uniaxial stress relaxation could be de- scribed by the Prony series. Through introducing adjusting functions into fitting equations of uniaxial stress relaxation, the biaxial stress relaxation could be well simulated.

关 键 词：PVC膜材 单轴应力松弛 双轴应力松弛 Prony级数 数值模拟 

分 类 号：TU502.6[建筑科学—建筑技术科学]