锈蚀钢筋混凝土柱抗震性能劣化研究

项目名称： 锈蚀钢筋混凝土柱抗震性能劣化研究

项目编号： No.51308343

项目类型： 青年科学基金项目

立项/批准年度： 2014

项目学科： 建筑科学

项目作者： 董志君

作者单位： 深圳信息职业技术学院

项目金额： 25万元

中文摘要： 钢筋混凝土结构受各种环境腐蚀作用时，结构的性能不断劣化，如混凝土强度降低、钢筋锈蚀、混凝土保护层开裂、剥落，导致钢筋混凝土结构的承载能力不断降低。地震是随机的，结构性能劣化到一定程度时，即使能够承受静力荷载，却不一定能够承受地震的动荷载，因此有必要研究锈蚀钢筋混凝土结构的抗震性能的劣化规律，本课题将在总结国内外关于锈蚀钢筋混凝土柱承载力劣化的基础上，对20个400*400*1500mm的钢筋混凝土试件进行滞回试验，研究不同锈蚀程度对试件的滞回性能及破坏模式的影响；对MSC.MARC进行二次开发，模拟锈蚀钢筋-混凝土的粘结与滑移，钢筋锈蚀引起的混凝土开裂，利用单元生死控制模拟混凝土的剥落，建立锈蚀钢筋混凝土柱的滞回曲线模拟的精细有限元模型；在模拟试验结果的基础上，进行有限元模型参数分析，最终基于试验结果和有限元分析结果提出适用于描述锈蚀钢筋混凝土柱滞回性能劣化的力学模型。

中文关键词： 钢筋锈蚀；外加电流；腐蚀率；扩散角；电流效率

英文摘要： Because of the tough environment attack the performance of reinforced concrete structure will degrade. Due to the reduction of concrete strength, the rebar corrosion, the formation of crack and broken of concrete cover, the load-bearing capacity will decrease. Earthquakes occur randomly, the dynamic behavior of a degraded concrete structure draws a lot of attention. It is necessary to investigate the degraded performance of reinforced concrete structure under a seismic attack. In this project, hysteric test will be carried out by using 20 reinforced concrete columns with a size of 400*400*1500mm. The specimens are firstly degraded by means of different corrosion rate. The hysteric performance and failure mode will be focused on. The bond and slip performance between corroded rebar and concrete will be simulated by using a modified version of MSC.MARC. The concrete cracks induced by volume expand of rust, the element birth and death function will be used to simulate the peeling off of the concrete cover. Based those functions detailed FEM model will be set-up to simulate the hysteric performance of reinforced concrete columns with corroded rebar. The influence parameters will be taken into account means of by FEM analysis. Finally a mechanical model of hysteric performance for reinforced concrete with corroded re

英文关键词： Corrosion of rebar；impressed current；corrosion rate；diffusion angle；current efficency