气候变化对RC结构碳化侵蚀可靠度的影响

Influence of climate change on reliability of RC structure under carbonization

气候变化引起的全球大气中CO2浓度的升高,加速了钢筋混凝土（RC）结构的劣化.针对《混凝土耐久性设计规范》中规定的碳化环境（Ⅰ类环境）,评估了未来气候变化对中国RC结构在正常使用极限状态下时变可靠度的影响.研究显示：未来气候变化使中国RC结构的平均碳化深度增大20%~40%,降低了RC结构的碳化侵蚀可靠度.到2100年,混凝土结构耐久性设计规范中Ⅰ类环境下Ⅰ-A、Ⅰ-B环境作用等级的耐久性规定不能够适应气候变化对中国钢筋混凝土结构的耐久性影响.

CO2concentration enrichment induced by climate change will enhance the deterioration of reinforced concrete（RC） structures. The influence of climate change on the reliability of reinforced concretestructure under carbonization was analyzed based on the environmental conditions specified in the＂Code for durability design of concrete structures＂. Consider of climate change,the average carbonation depth is increased for 20%- 40%,and the reliability is decreased. It is predicted that,by 2100,the provisions specified in the code for I-A and I-B environment conditions would not satisfy the demand of structure durability.