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  苏佶智,邢国华,马煜东,刘伯权.反复荷载作用下锈蚀钢筋混凝土柱力学性能研究[J].震灾防御技术,2018,(3):512-523, DOI:10.11899/zzfy20180303.

反复荷载作用下锈蚀钢筋混凝土柱力学性能研究
摘要:    采用有限元软件ABAQUS,以锈蚀率(0%、5%、10%、15%和20%)为变量,对5根钢筋混凝土柱的力学性能进行了数值模拟,研究各试件的滞回性能、骨架曲线、延性及耗能能力,分析钢筋锈蚀率对承载力、延性、耗能和塑性铰转动能力的影响。研究结果表明:模拟分析得到的锈蚀钢筋混凝土柱的强度和变形与试验结果吻合较好,建立的有限元模型可用于锈蚀钢筋混凝土柱的力学性能分析;混凝土开裂前,锈蚀构件的力学性能基本与未锈蚀构件相同,混凝土开裂后,构件的承载力、屈服荷载、极限位移、延性等均随钢筋锈蚀率的增大而降低;轻度锈蚀构件的滞回性能和破坏形式与未锈蚀构件类似,随着钢筋锈蚀率逐渐增大,滞回环的饱满程度降低,“捏拢”现象严重,滞回曲线由“弓形”逐渐发展成“反S形”,耗能能力降低,破坏形式趋于脆性破坏,位移延性系数、平均耗能系数等指标逐渐下降。
作者单位
苏佶智 长安大学, 建筑工程学院, 西安 710061 
邢国华 长安大学, 建筑工程学院, 西安 710061 
马煜东 长安大学, 建筑工程学院, 西安 710061 
刘伯权 长安大学, 建筑工程学院, 西安 710061 
关  键  词:锈蚀  钢筋混凝土柱  力学性能  数值模拟
DOI:10.11899/zzfy20180303
基金项目:国家自然科学基金项目(51578077),陕西省国际科技合作与交流计划项目(2016KW-056)
收稿日期:2018-02-28
作者简介:苏佶智,男,生于1989年。博士研究生。主要从事混凝土结构抗震研究。E-mail:sujizhi1989@163.com
通讯作者:邢国华,男,生于1983年。教授。主要从事混凝土结构抗震研究。E-mail:ghxing@chd.edu.cn
Study on Mechanical Properties of Corroded Reinforced Concrete Frame Columns Under Cyclic Load
Abstract:      The numerical simulation of the mechanical properties of five corroded reinforced concrete columns with different degree of corrosion was presented with the finite element software ABAQUS. Hysteretic behavior, skeleton curve, ductility and energy dissipation capacity of specimens was studied. The influence of corrosion amount on bearing capacity, ductility, energy dissipation capacity and plastic hinge rotation capability were analyzed. Our results show that the strength and deformation of the specimens obtained by simulation are in good agreement with the test results. The numerical model established in this paper can be used for the mechanical properties analysis of corroded reinforced concrete columns. Before the cracking of concrete, the corrosion of steel bars has no obviously effect on the mechanical properties of concrete bending members. After the cracking of concrete, bearing capacity, yield load, ultimate displacement and ductility of specimens decrease with the increase of the corrosion rate. The hysteresis behavior and the failure mode of mildly corroded specimens are similar to those of non-corroded specimens. As the increase of corrosion amount, the hysteresis loop gradually deflates, and its pinch phenomenon is more serious. The shape of hysteresis curve gradually develops from bow-shaped to anti-S-shaped. The failure mode of specimens tend to be brittle failure. The displacement ductility factor, coefficient of average energy dissipation and other indicators decrease too.
Keywords:  Corrosion  Reinforced concrete column  Mechanical properties  Numerical simulation
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