考虑温度效应的钢管混凝土轴压构件徐变模型预测  

Creep model prediction of concrete-filled steel tube members under axial compression considering temperature effect

作　　者：祁强 张思远 QI Qiang;ZHANG Siyuan(Department of Architectural Engineering,Pingliang Vocational Technology College,Pingliang 744000,China;School of Architectural Engineering,Guangzhou Vocational University of Science and Technology,Guangzhou 510550,China)

机构地区：[1]平凉职业技术学院建筑工程系,甘肃平凉744000 [2]广州科技职业技术大学建筑工程学院,广东广州510550

出　　处：《四川建筑科学研究》2024年第4期26-32,共7页Sichuan Building Science

摘　　要：为研究钢管混凝土结构含钢率、核心混凝土强度、温度三者共同作用下钢管混凝土的徐变模型,进行了常温环境和变温环境下6.6%、9.2%、12.5%3种含钢率钢管混凝土试件在长期轴压荷载下的徐变试验,测试了297 d不同含钢率钢管混凝土试件在不同温度作用下徐变应变随时间的变化规律。研究结果表明:(1)钢管混凝土徐变随含钢率的增大而非线性减小;(2)温度对钢管混凝土徐变影响较大;(3)通过与目前常用的9种徐变模型计算值相比较,常温环境下15规范模型最适用于钢管混凝土结构;(4)基于活化能理论对常温环境下的钢管混凝土构件徐变模型进行修正,得到了含钢率、核心混凝土强度、温度三者共同作用下钢管混凝土的徐变模型。In order to study the creep model of concrete-filled steel tube(CFST)structure under the combined action of steel ratio,core concrete strength and temperature,the creep tests were conducted on CFST specimens with steel ratio of 6.6%,9.2%and 12.5%under long term axial compression load in both room temperature and convenient environments.The creep strain of CFST specimens with different steel ratios at different temperatures was measured for 297 days.The results show that the creep of CFST decreases nonlinearly with the increase of steel ratio.The temperature has a great effect on the creep of CFST.Comparing with the calculated values of 9 common creep models,the model of 15 gauge is most suitable for CFST structure at room temperature environment.Based on the activation energy theory,the creep model of CFST members at room temperature was modified,and the creep model of CFST under the combined action of steel ratio,core concrete strength and temperature was obtained.

关 键 词：钢管混凝土 徐变 温度 含钢率 

分 类 号：TU398.9[建筑科学—结构工程]