圆钢管混凝土短柱冻融循环条件下承载力性能研究  

Study on bearing capacity of circular CFST stub column after being exposed to freeze-thaw cycle

作　　者：周林强 高山[1,2] 张开元 常晨 彭震[1,3] ZHOU Linqiang;GAO Shan;ZHANG Kaiyuan;CHANG Chen;PENG Zhen(Shaanxi Key Laboratory of Safety and Durability of Concrete Structures,Xijing University,Xi′an 710123,China;Postdoctoral Station of Civil Engineering,Chongqing University,Chongqing 400045,China;Central Research Institute of Building and Construction(Shenzhen),MCC Group,Shenzhen 518000,China)

机构地区：[1]西京学院陕西省混凝土结构安全与耐久性重点实验室,陕西西安710123 [2]重庆大学土木工程博士后流动站,重庆400045 [3]中冶建筑研究总院(深圳)有限公司,广东深圳518000

出　　处：《混凝土》2022年第8期15-19,24,共6页Concrete

基　　金：国家自然科学基金资助项目(51908085);陕西省自然科学基础研究计划资助项目(2019JQ-145);陕西高校青年创新团队资助。

摘　　要：进行了48根圆钢管混凝土短柱试件在冻融循环后的轴压试验,并对这些试件的破坏形态和力-位移关系进行了分析,主要参数为混凝土强度与冻融循环次数。试验结果表明,试件的破坏模式受冻融循环影响较小,但随着冻融循环次数的增加,试件的极限承载力和弹性段长度都会逐渐降低。基于试验结果,提出了冻融循环作用后的核心混凝土本构模型与承载力计算式,并采用试验结果对其进行了验证。The behavior of circular cross-section concrete filled steel tube(CFST)stub columns after being exposed to freeze-thaw cycle were experimentally investigated.48 circular cross-section specimens were test.The failure pattern and load versus deformation and ultimate strength were obtained and analyzed.The number of freeze-thaw cycleand the strength of core concrete were considered as the main variable parameters.The test results showed that the freeze-thaw cycles show little effect on the failure mode of the specimens.With the increase of number of freeze-thaw cycle,the ultimate strength and length of elastic stage decreased.A constitutive model and formula for core concrete subjected to freeze-thaw cycle were proposed and evaluated by comparison between calculated and experimental results.

关 键 词：圆钢管混凝土 冻融循环 极限承载力 套箍系数 有限元 

分 类 号：TU528.01[建筑科学—建筑技术科学]