钢筋混凝土柱冻融损伤模型研究

为研究冻融后钢筋混凝土柱在地震作用下的响应,根据冻融损伤在构件截面分布的不均匀性,基于纤维截面分析方法,提出可考虑该分布的混凝土强度退化模型,以及等效冻融循环次数的计算方法。根据8榀考虑冻融影响的钢筋混凝土柱拟静力加载试验数据,对该文提出的模型进行了验证,同时与既有考虑冻融的混凝土模型进行了对比分析。结果表明:与未考虑冻融损伤分布的既有模型相比,该文模型的计算承载力较小,与试验数据吻合更好,即能够更准确地模拟不同程度冻融损伤后钢筋混凝土柱的地震反应。

RESEARCH ON THE MODELLING METHOD OF REINFORCED CONCRETE COLUMN SUBJECTED TO FREEZE-THAW DAMAGE

Recognizing that the freeze-thaw damage is unevenly distributed on the component section,this paper proposed a concrete model that could take the uneven strength degradation due to freeze-thaw cycles into consideration,and a calculation method for equivalent numbers of freeze-thaw cycles was put forward.The model was validated using the data of pseudo static test on the reinforced concrete columns with different freeze-thaw damages.An existing concrete model concerning freeze-thaw cycles was also referred to make a comparison.The results show that the bearing capacity calculated by the proposed model is relatively conservative,and matches the test data better than the existing model which doesn’t consider the distribution of freeze-thaw damage,indicating that the proposed model could be used for modelling the seismic behavior of reinforced concrete columns with different freeze-thaw damage.