冻融循环作用下承压混凝土冻胀应变研究  

Research on frost heaving strain of stressed concrete under freeze-thaw cycle

作　　者：董振平[1] 黄新凯 雷永洁 刘西光[1] 牛荻涛[1] DONG Zhenping;HUANG Xinkai;LEI Yongjie;LIU Xiguang;NIU Ditao(College of Civil Engineering,Xi′an University of Architecture and Technology,Xi′an 710055,China)

机构地区：[1]西安建筑科技大学土木工程学院,陕西西安710055

出　　处：《西安建筑科技大学学报（自然科学版）》2023年第4期515-519,545,共6页Journal of Xi'an University of Architecture & Technology(Natural Science Edition)

基　　金：国家自然科学基金项目(52178163&51808437);陕西省重点研发基金项目(2022SF-403)。

摘　　要：对不同应力水平的混凝土圆柱体构件进行了冻融循环试验,在冻融循环过程中通过动态模拟法得到了冻融全过程混凝土冻胀应变的发展规律.试验结果表明:冻融循环过程中随温度降低冻胀应变不断增大,温度回升后冻胀应变随之降低.随着冻融循环次数的增加,钢筋有效应变逐渐降低,冻胀应变滞回环的上部包络线随之升高,残余应变不断增加;随应力水平的增加,钢筋有效应变损失速率加快,冻胀应变逐渐降低.The freeze-thaw cycle tests were carried out on concrete cylindrical members with different stress levels,and in the process of freeze-thaw cycle,the development law of frost heave strain of concrete in the whole process of freeze-thaw was obtained by dynamic simulation method.The experimental results showed that the frost heaving strain increased with the decrease of temperature during the freeze-thaw cycle,and decreased with the rise of temperature.With the increase of freeze-thaw cycles,the effective strain of reinforcement gradually decreased,the upper envelope of the freeze-heave strain hysteresis ring increased,and the residual strain increased.With the increase of stress level,the effective strain loss rate of reinforcement accelerated and the frost heaving strain decreased gradually.

关 键 词：冻融损伤 应力水平 冻胀应变 残余应变 

分 类 号：TU528.1[建筑科学—建筑技术科学]