HRB400 Ⅲ级抗震钢筋的低周疲劳性能
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摘要
对HRB400 Ⅲ级抗震钢筋的低周疲劳性能进行了研究。采用轴向应变控制方法,在岛津电液伺服疲劳试验机上测定了试验钢低周疲劳过程中的循环应力响应特征及循环应力与应变的关系;通过拟合Basquin公式和Coffin-Manson公式,获得了试验钢的低周疲劳寿命预测公式。断口扫描发现,试验钢裂纹起源于试样表面,通过不断扩展形成微裂纹,再连接成宏观裂纹,最终导致材料断裂。
Low cycle fatigue properties of anti-seismic HRB400 grade Ⅲ reinforcing steel bar were investigated.The fatigue tests were conducted on Shimadzu servo-hydraulic testing machine.The tests were run under uniaxial tension-compression loading with total strain control.The cyclic stress response characteristics and relationship between cyclic stress and strain of the steel were measured.The strain-life data from the axial tests were used to derive suitable Coffin-Manson parameters for the test material.The scanning electron microscope(SEM)micrographs reveal that the fatigue cracks initiate from the surfaces of samples.Due to the propagation and connection of the micro-cracks,macro-cracks form and fracture occurs eventually.
Low cycle fatigue properties of anti-seismic HRB400 grade Ⅲ reinforcing steel bar were investigated.The fatigue tests were conducted on Shimadzu servo-hydraulic testing machine.The tests were run under uniaxial tension-compression loading with total strain control.The cyclic stress response characteristics and relationship between cyclic stress and strain of the steel were measured.The strain-life data from the axial tests were used to derive suitable Coffin-Manson parameters for the test material.The scanning electron microscope(SEM)micrographs reveal that the fatigue cracks initiate from the surfaces of samples.Due to the propagation and connection of the micro-cracks,macro-cracks form and fracture occurs eventually.
引文
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[2]赵蕴林.5.12大地震后砖混结构房屋抗震加固技术探讨[J].四川理工学院学报:自然科学版,2011,24(2):129.
[3]龚士弘,盛光敏.对“钢筋混凝土结构构件抗震设计”材料部分的意见[J].工程建设标准化,1996(1):6.
[4]蒲玉梅,吴林,吴结才.Q235B、Q345BH型钢综合抗震性能试验研究[J].安徽冶金,2005(4):1.
[5]赵蕴林.普通民用建筑基础隔震技术研究[J].四川理工学院学报:自然科学版,2011,24(3):249.
[6]龚士弘,盛光敏.地震区建筑用钢的韧性对建筑物抗震性能的影响[J].工程抗震,2004(3):41.
[7]龚士弘,盛光敏.抗震设计用钢探讨[J].工程抗震,1995(3):37.
[8]Apostolopoulos C.Mechanical behavior of corroded reinforcing steel bars S500stempcore under low cycle fatigue[J].Construction and Building Materials,2007,21(7):1447.
[9]Abdalla J A,Hawileh R A,Oudah F,et al.Energy-based prediction of low-cycle fatigue life of BS 460Band BS B500B steel bars[J].Materials and Design,2009,30(10):4405.
[10]陈伟,苏鹤洲,李金柱.钒氮微合金化hrb400抗震钢筋的研制[J].云南冶金,2007,36(5):36.
[11]李洪岩,金学军,许荣昌.建筑用抗震钢研究概述[J].莱钢科技,2008(3):5.
[12]秦斌,盛光敏,龚士弘.20MnSiVHRB400钢筋的低周疲劳性能分析[J].重庆大学学报,2003,26(7):93.
[13]秦斌,盛光敏,龚士弘.HRB400抗震钢筋的综合性能[J].钢铁研究学报,2006,18(5):33.
[14]龚士弘,盛光敏,李毅,等.压力容器钢16MnR在地震载荷下的低周疲劳性能[J].钢铁,1995,30(10):48.
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