循环荷载作用下高强混凝土收缩徐变试验研究  

Creep experiments for high strength concrete with cycle loading

作　　者：唐云清[1] 柯敏勇[1] 刘海祥[1] 陈松 

机构地区：[1]南京水利科学研究院水利部水工新材料工程技术中心,江苏南京210029 [2]重庆市水库大坝安全监测中心,重庆401147

出　　处：《水利水运工程学报》2012年第6期7-15,共9页Hydro-Science and Engineering

基　　金：国家863计划资助项目(2007AA112106);西部交通建设科技资助项目(200631822327);中央级公益性科研院所基本科研业务费专项资金项目(K20110406)

摘　　要：高强混凝土收缩徐变特性是国内外混凝土材料性能研究的重点之一,而循环荷载作用下高强混凝土收缩徐变报道较少.以预应力钢筋混凝土梁为试验对象,开展了循环荷载作用下高强混凝土徐变试验,得到了相应循环荷载作用下高强混凝土弹性模量和收缩徐变系数,并将收缩徐变系数和现有收缩徐变模型计算值进行了对比分析,结果表明在循环荷载作用下高强混凝土徐变明显大于恒载作用下的徐变,徐变发展呈单调递增趋势,预应力损失和高强混凝土徐变具有耦合关系;因现有模型不能准确预测收缩徐变发展规律,建议采用指数函数拟合进行计算分析.Shrinkage and creep are inherent time-varying characteristics for high strength concrete, and most researches focus on creep for constant loading, while creep for the cycle loading is neglected. Taking reinforced concrete beams as creep test samples, studies on the elastic modulus and creep coefficients of high strength concrete under varying loading are carried out, and revision coefficients for creep are provided. It is indicated that the creep coefficients with the cycle loading are much larger than that with the constant loading, and that the existing creep calculation functions cannot forecast the development of creep accurately. Index number function is thus proposed to forecast the creep development with the cycle loading.

关 键 词：收缩徐变 变化荷载 弹性模量 变形特征 高强混凝土 

分 类 号：TV332[水利工程—水工结构工程]