硫酸盐侵蚀环境下基于B3模型的混凝土抗压强度时效分析

摘要

基于B3模型,建立了持续荷载下混凝土抗压强度的时效模型.通过考虑持续荷载和硫酸盐共同作用对混凝土截面有效应力的影响,建立了持续荷载和硫酸盐共同作用下混凝土抗压强度的时效模型.经分析,持续荷载和环境因素是影响混凝土抗压强度时效水平主要的因素,而混凝土强度等级对强度时效水平的影响较小.%Based on the B3 model of concrete creep and shrinkage,this paper established the time-effect model of concrete compressive strength under sustained load.By considering effects of sustained load and sulphate attack on the section effective stress,the paper further developed the time-effect model of concrete compressive strength under sustained load and sulphate attack.Based on analysis,the sustained load and environment are the main factors that affect the time-variation of concrete compressive strength; and the strength grade of concrete has little influence on the time-variation of concrete compressive strength.