硫酸盐侵蚀混凝土轴心受压构件徐变分析  

Creep Analysis of Axially Compressed Concrete Member under Sulphate Attack

作　　者：曹健[1] 王元丰[1] 

机构地区：[1]北京交通大学土木建筑工程学院,北京100044

出　　处：《建筑材料学报》2011年第4期459-464,477,共7页Journal of Building Materials

基　　金："十一五"国家科技支撑计划重点项目(2006BAJ06B04);交通部西部交通建设科技项目(200631823302-08)

摘　　要：将混凝土损伤力学理论研究方法与B3徐变模型相结合,采用应力级别、硫酸盐溶液质量分数、混凝土构件截面有效尺寸、混凝土经受应力腐蚀的时间等参数对压应力状态与硫酸盐侵蚀共同作用下的混凝土B3徐变模型进行了修正,通过非线性回归建立了硫酸盐侵蚀下混凝土轴心受压构件的修正B3徐变预测模型.与不同的试验资料对比表明,采用该修正徐变模型得到的预测值与试验数据吻合较好.应用该修正徐变模型,分析了水灰比、骨料水泥比、构件截面尺寸以及应力级别、硫酸盐溶液质量分数等因素对混凝土徐变的影响.Taking the characteristics of sulphate attack on concrete into consideration,the B3 creep model is modified by parameters of stress level,concentration of sulphate,effctive size of cross section of concrete member and loading time,in combination with the concrete damage mechanics theory.The modified B3 creep model is presented by nonlinear regression of experimental data to predict the time-dependent deformations of concrete under coupled effects of sustained loading and sulfate attack.The obtained results are in good agreement with some other experimental results.Finally,the modified creep model is applied to analyze the influence on the concrete creep from varied water to cement ratio,aggregate to cement ratio,size of concrete specimen,stress level and concentrations of sulphate solution.

关 键 词：硫酸盐侵蚀 徐变 B3徐变模型 损伤力学 混凝土 轴心受压 

分 类 号：TU528.01[建筑科学—建筑技术科学]