基于MCFT的腐蚀RC矮墩柱数值模拟方法  

NUMERICAL SIMULATION METHOD OF CORRODED STOCKY PIER RC COLUMN BASED ON MCFT

作　　者：李亚林 郑山锁[1,2] 尚志刚 段培亮 陈嘉晨 LI Ya-lin;ZHENG Shan-suo;SHANG Zhi-gang;DUAN Pei-liang;CHEN Jia-chen(School of Civil Engineering,Xi’an University of Architecture and Technology,Xi’an 710055,China;Key Lab of Structural Engineering and Earthquake Resistance,Ministry of Education(XAUAT),Xi’an 710055,China)

机构地区：[1]西安建筑科技大学土木工程学院,西安710055 [2]西安建筑科技大学结构工程与抗震教育部重点实验室,西安710055

出　　处：《工程力学》2024年第8期131-140,共10页Engineering Mechanics

基　　金：国家自然科学基金项目(52278530);国家重点研发计划项目(2019YFC1509302);陕西省重点研发计划项目(2021ZDLSF06-10)。

摘　　要：采用电化学氯腐蚀的方法对5根剪跨比为2的RC矮墩柱进行室内加速腐蚀试验,并对其进行拟静力加载试验。根据试验结果分析了腐蚀损伤和轴压比对RC柱破坏过程、承载能力、变形能力和耗能能力的影响。通过理论推导,建立了基于MCFT(修正压力场理论)的考虑腐蚀损伤的钢筋混凝土剪切行为本构模型,进而提出了考虑弯-剪-滑移耦合效应的数值模拟方法。对比模拟结果和试验结果可知:采用该模拟方法得到的各柱试件的滞回曲线与实际滞回曲线符合较好,骨架曲线特征点及累积耗能值误差较小,表明该研究提出的考虑腐蚀的剪切行为本构及数值模拟方法可以较为准确地反映腐蚀RC矮墩柱的抗震性能,该研究成果可为腐蚀损伤在役RC墩柱的抗震性能评估奠定基础。An accelerated indoor corrosion test was conducted on five stocky reinforced concrete(RC)pier columns with a shear-to-span ratio of 2 using electrochemical chlorine corrosion,and a quasi-static loading test was conducted.According to the test results,the effects of corrosion damage and axial load ratio on the damage process,on the bearing capacity,on the deformation capacity and on the energy dissipation capacity of RC columns were analyzed.Through theoretical derivation,a shear behavior constitutive model of reinforced concrete based on MCFT(the modified compression-field theory)considering corrosion damage was established,and then a numerical simulation method considering the bending-shear-slip coupling effect was proposed.Comparing the simulation results with the experimental results,it can be seen that:the hysteresis curves of the column specimens obtained by the simulation method are in a good agreement with the actual hysteresis curves,and the errors of the characteristic points of the skeleton curves and the accumulated energy dissipation values are small,which indicated that the numerical simulation method considering corrosion shear behavior proposed in this study can reflect the seismic performance of corroded stocky RC pier columns more accurately.The research results can lay a foundation for the seismic performance assessment of RC piers in service with corrosion damage.

关 键 词：RC矮墩柱 腐蚀损伤 剪切本构模型 数值模拟 纤维模型 

分 类 号：U443.22[建筑科学—桥梁与隧道工程]