锈蚀钢筋混凝土柱偏心受压性能精细化模拟  

Refined simulation of eccentric compression behavior of corroded reinforced concrete columns

作　　者：金浏[1] 李炎锡 张仁波[1] 杜修力[1] JIN Liu;LI YanXi;ZHANG RenBo;DU XiuLi(The Key Laboratory of Urban Security and Disaster Engineering,Beijing University of Technology,Beijing 100124,China)

机构地区：[1]北京工业大学城市减灾与防灾防护教育部重点实验室,北京100124

出　　处：《中国科学：技术科学》2022年第4期599-612,共14页Scientia Sinica(Technologica)

基　　金：国家自然科学基金(批准号:51822801);国家重点研发计划(编号:2019YFC1511003)资助项目。

摘　　要：针对锈蚀钢筋混凝土(RC)柱的偏心受压力学行为,本文从细观角度出发,将混凝土看作是由骨料、砂浆基质和界面过渡区组成的三相复合材料,并且考虑锈蚀导致的钢筋和保护层混凝土的材料性能劣化以及黏结强度退化,建立了其三维细观精细化有限元分析模型.数值计算结果与试验结果的良好吻合,验证了数值分析模型的合理性.在此基础上,主要分析了锈蚀率和偏心率对RC柱偏压力学性能的影响.发现:钢筋锈蚀会引起临界偏心率增大,使构件趋于脆性破坏;锈蚀率增加会明显降低柱的刚度、延性和承载力;偏心率的增加则会导致构件轴向承载力降低,柱的破坏模式变为大偏心受压破坏.最后,基于完好状态RC压弯构件承载力统一公式,考虑钢筋锈蚀的影响,发展建立了锈蚀RC构件压弯承载力计算公式,并与试验结果进行对比,验证了所提公式的准确性.In this paper,concrete is considered a three-phase composite material composed of aggregate,a mortar matrix,and an interface transition zone to investigate the eccentric compressive behavior of corroded reinforced concrete(RC)columns from the mesoscopic perspective.The deterioration of the material properties of steel bars,concrete cover,and bond strength was considered to be caused by corrosion,and a three-dimensional refined finite element analysis model was established.The numerical results are in good agreement with the experimental results,which verifies the rationality of the numerical analysis model.The effect of corrosion level and eccentric ratio on the eccentric performance of corroded RC columns is explored and discussed.The simulation results indicate that the corrosion of steel bars increases the critical eccentricity,which may make the structure tend to brittle failure.The increased corrosion level would obviously cause a reduction of stiffness,ductility,and ultimate bearing capacity of the columns.In addition,increased eccentricity causes a reduction in axial bearing capacity,and the failure mode of columns changes to large eccentric compression failure.Eventually,based on the unified formula for the bearing capacity of RC members in good condition and in consideration of the influence of steel corrosion,a calculation formula for the bearing capacity of corroded RC members was developed.The accuracy of the proposed formula was verified in comparison with the experiment results.

关 键 词：钢筋混凝土柱 偏心受压 锈蚀 承载力 细观分析 

分 类 号：TU398.9[建筑科学—结构工程]