轴拉荷载下混凝土徐变性能的研究  

Uniaxial Tensile Creep of Concrete

作　　者：王德法[1] 张浩博[2] 

机构地区：[1]西安交通大学,西安710049 [2]西安理工大学

出　　处：《西安交通大学学报》2000年第3期95-98,共4页Journal of Xi'an Jiaotong University

基　　金：水利部水利水电科学基金资助项目! (92 0 6 85 73)

摘　　要：用轴心受拉混凝土试件 ,在标准条件下养护一个月后 ,进行了不同应力水平下轴心受拉徐变破坏试验 ,观测了混凝土在不同应力水平下的轴拉徐变变形过程 ,通过分析得到了对应于不同轴拉应力水平时的混凝土的徐变变形规律 .当持荷应力低于徐变长期强度时 ,混凝土在持续拉伸荷载作用下变形速度缓慢 ,并且不发生徐变破坏 ;当持荷应力高于徐变长期强度时 ,混凝土在持续拉伸荷载作用下的徐变变形随时间的增长不断增加 ,直至发生徐变破坏 .这类徐变变形过程一般可以分为3个阶段 (即徐变减速阶段、稳定徐变阶段和徐变加速阶段 ) .Creep failure of concrete under sustained tensile stress has been investigated experimentally. Specimens are cured under standard conditions for one month. Creep laws are applied and show that concrete deforms slowly and no creep failure occurs when the tensile stress is lower than the creep rupture strength of concrete. However, when the sustained tensile stress is higher than the creep rupture strength of concrete, the creep failure occurs and three deforming phases are observed. They include decelerating creep, stable creep and accelerating creep. Furthermore, the creep deforming expressions of concrete under sustained tensile stresses have been obtained on basis of the experimental results.

关 键 词：混凝土 轴向拉伸 徐变破坏 应力水平 荷载 

分 类 号：TU528.01[建筑科学—建筑技术科学]