高强钢管高强混凝土徐变特性试验研究  

EXPERIMENTAL STUDY ON THE CREEP CHARACTERISTICS OF HIGH-STRENGTH CONCRETE FILLED HIGH-STRENGTH STEEL TUBE

作　　者：黄永辉[1] 刘爱荣[1] 傅继阳[1] 朱书汉 饶瑞[1] HUANG Yong-hui;LIU Ai-rong;FU Ji-yang;ZHU Shu-han;RAO Rui(Research Center for Wind Engineering and Engineering Vibration,Guangzhou University,Guangzhou,Guangdong 510006,China)

机构地区：[1]广州大学风工程与工程振动研究中心,广东广州510006

出　　处：《工程力学》2021年第8期204-212,256,共10页Engineering Mechanics

基　　金：国家自然科学基金面上项目(11972123,51878188);高等学校学科创新引智计划项目(D21021)。

摘　　要：高强钢管高强混凝土的应用越来越广泛,但目前对于其徐变特性的试验研究较少。该文对15根不同含钢率的高强钢管高强混凝土轴压短柱进行了365 d的收缩和徐变测试,并将试验结果与常用的徐变预测模型MC90、ACI209和MC2010等进行了对比。试验结果表明:高强钢管高强混凝土的徐变系数远小于素混凝土,当加载365 d后,素混凝土的徐变系数是高强钢管高强混凝土的2倍以上;含钢率对钢管混凝土试件的徐变有一定影响,徐变系数随着含钢率的增大而减小。在对比的3种常用徐变预测模型中,MC2010模型的徐变预测结果与试验结果吻合最好,可推荐用于高强钢管高强混凝土的收缩和徐变效应计算。此外,还将高强钢管高强混凝土与普通钢管混凝土的徐变试验结果进行了对比,结果表明,钢管混凝土的徐变随着核心混凝抗压强度的增加而减小。研究成果可为高强钢管高强混凝土轴心受压构件在正常使用阶段的徐变预测及徐变变形控制提供依据。High strength concrete filled steel tube(HS-CFST) is widely used in civil engineering, however, the studies on the creep properties of HS-CFST are rarely reported. It measured the shrinkage and creep of fifteen specimens with different steel ratios under the action of axial compression for 365 days. The experimental results were compared with the prediction ones from the creep prediction model of MC 90, ACI 209 and MC 2010. It showed that: the creep coefficients of HS-CFST specimens are far less than that of the plain concrete specimens,and by the end of 365 days, the creep coefficient of plain concrete was more than twice of that of concrete in HSCFST. The steel ratio affects the creep of the CFST specimens. The creep coefficient decreases as the steel ratio increases. Among the three existing creep models, the MC 2010 model can well predict the creep behavior of the HS-CFST specimens. Furthermore, the creep coefficient of the HS-CFST specimens were also compared with that of the normal strength CFST, and the results showed that the creep of CFST decreases as the compressive strength of the core concrete increases. It provides a useful reference for the creep prediction and creep control of HSCFST under the action of axial compression.

关 键 词：高强钢管高强混凝土 收缩和徐变试验 徐变系数 徐变预测模型 普通钢管混凝土 

分 类 号：TV335[水利工程—水工结构工程]