坑蚀钢筋二次拉伸力学性能试验研究
|
摘要
通过机械制缺模拟自然环境中钢筋不同程度的坑蚀,研究坑蚀程度对钢筋二次受力时强度与伸长率等力学性能的影响规律.结果表明:坑蚀钢筋一次或二次拉伸时,随坑蚀深度增加,塑性变形性能下降,名义抗拉强度降低,但实际抗拉强度有所提高;对于加载到强化段卸载的坑蚀钢筋在二次加载时无明显的屈服平台,经历时效硬化后,屈服平台将会重现,且二次名义屈服强度较一次加载时有所提高.时效硬化的时长与坑蚀程度无明显关系;坑蚀钢筋二次受力时伸长率随坑蚀深度以及时效天数的增加而减小,其中坑蚀深度对伸长率的影响更加显著.
The effect of degree of pit corrosion on mechanical properties such as strength and elongation of steel bars under the secondary loading is studied.The study is carried out by simulating different degree of pit corrosion of steel bars in natural environment through mechanical defects.The results indicate that when the pit corroded steel bars are stretched once or twice,the plastic deformation performance decreases gradually.The nominal tensile strength decreases but the actual tensile strength increases with the increase of the depth of corrosion spot;The pit corroded steel bars are unloaded when the load reaches its reinforcement service stage.The yield platform is not obvious during the secondary loading.The yielding platform will reappear and the secondary nominal yield strength is improved after age hardening compared to the once loading.The relationship between the duration of age hardening and the degree of pit corrosion is not obvious;The elongation of the pit corroded steel bars decreases with the increase of the depth of corrosion spot and aging time under the secondary loading,the effect of the depth of corrosion spot on elongation is more obvious.
The effect of degree of pit corrosion on mechanical properties such as strength and elongation of steel bars under the secondary loading is studied.The study is carried out by simulating different degree of pit corrosion of steel bars in natural environment through mechanical defects.The results indicate that when the pit corroded steel bars are stretched once or twice,the plastic deformation performance decreases gradually.The nominal tensile strength decreases but the actual tensile strength increases with the increase of the depth of corrosion spot;The pit corroded steel bars are unloaded when the load reaches its reinforcement service stage.The yield platform is not obvious during the secondary loading.The yielding platform will reappear and the secondary nominal yield strength is improved after age hardening compared to the once loading.The relationship between the duration of age hardening and the degree of pit corrosion is not obvious;The elongation of the pit corroded steel bars decreases with the increase of the depth of corrosion spot and aging time under the secondary loading,the effect of the depth of corrosion spot on elongation is more obvious.
引文
[1]Mehta P K.Concrete Durability:Fifty Year's Progress[C].Proceedings of the 2nd International Conference on Concrete Durability,Montreal,QC,Canada,4-9 August 1991:1-32.
[2]易伟建,孙晓东.锈蚀钢筋混凝土梁疲劳性能试验研究[J].土木工程学报,2007,40(3):6-10.
[3]Gang X,Ai T,Wang Q,et al.Simulation Analysis on Mechanical Properties for Corroded Deformed Steel Bar[C].2010international conference on digital manufacturing and automation.2010:350-353.
[4]李士彬,汤红卫,张鑫,等.自然锈蚀钢筋的疲劳试验[J].建筑材料学报,2014,17(5):811-815.
[5]徐港,徐浩铭,邓庆,等.负载锈蚀钢筋混凝土梁正截面抗弯承载力研究[J].工业建筑,2015,45(12):83-87.
[5]Peng Zhao,Gang Xu,Qing Wang,Juan Zhao,Xinqi Liu.Influence of stirrup arrangements on the corrosion characteristics of reinforced concrete membersnew[J].Construction and Building Materials,2018,192:683-695.
[7]邓庆,王青,赵鹏,等.腹板开裂钢筋混凝土梁抗力性能仿真分析[J].三峡大学学报(自然科学版),2014,36(6):73-75.
[8]范颖芳,周晶.考虑蚀坑影响的锈蚀钢筋力学性能研究[J].建筑材料学报,2003,6(3):248-252.
[9]惠云玲,林志伸,李荣.锈蚀钢筋性能试验研究分析[J].工业建筑,1997,27(6):10-13.
[10]袁迎曙,贾福萍,蔡跃.锈蚀钢筋的力学性能退化研究[J].工业建筑,2000,30(1):43-46.
[11]徐港,张懂,刘德富,等.氯盐环境下混凝土中锈蚀钢筋力学性能研究[J].水利学报,2012,39(4):452-459.
[12]王巧平,吴胜兴.锈蚀钢筋力学性能数字试验研究[J].浙江大学学报(工学版),2007,41(1):83-85.
[13]王青,徐港,卫军,等.混凝土中钢筋锈蚀深度比值的概率分布模型研究[J].工业建筑,2011,41(5):39-42.
[2]易伟建,孙晓东.锈蚀钢筋混凝土梁疲劳性能试验研究[J].土木工程学报,2007,40(3):6-10.
[3]Gang X,Ai T,Wang Q,et al.Simulation Analysis on Mechanical Properties for Corroded Deformed Steel Bar[C].2010international conference on digital manufacturing and automation.2010:350-353.
[4]李士彬,汤红卫,张鑫,等.自然锈蚀钢筋的疲劳试验[J].建筑材料学报,2014,17(5):811-815.
[5]徐港,徐浩铭,邓庆,等.负载锈蚀钢筋混凝土梁正截面抗弯承载力研究[J].工业建筑,2015,45(12):83-87.
[5]Peng Zhao,Gang Xu,Qing Wang,Juan Zhao,Xinqi Liu.Influence of stirrup arrangements on the corrosion characteristics of reinforced concrete membersnew[J].Construction and Building Materials,2018,192:683-695.
[7]邓庆,王青,赵鹏,等.腹板开裂钢筋混凝土梁抗力性能仿真分析[J].三峡大学学报(自然科学版),2014,36(6):73-75.
[8]范颖芳,周晶.考虑蚀坑影响的锈蚀钢筋力学性能研究[J].建筑材料学报,2003,6(3):248-252.
[9]惠云玲,林志伸,李荣.锈蚀钢筋性能试验研究分析[J].工业建筑,1997,27(6):10-13.
[10]袁迎曙,贾福萍,蔡跃.锈蚀钢筋的力学性能退化研究[J].工业建筑,2000,30(1):43-46.
[11]徐港,张懂,刘德富,等.氯盐环境下混凝土中锈蚀钢筋力学性能研究[J].水利学报,2012,39(4):452-459.
[12]王巧平,吴胜兴.锈蚀钢筋力学性能数字试验研究[J].浙江大学学报(工学版),2007,41(1):83-85.
[13]王青,徐港,卫军,等.混凝土中钢筋锈蚀深度比值的概率分布模型研究[J].工业建筑,2011,41(5):39-42.
© 2004-2018 中国地质图书馆版权所有 京ICP备05064691号 京公网安备11010802017129号 地址：北京市海淀区学院路29号 邮编：100083 电话：办公室：(+86 10)66554848；文献借阅、咨询服务、科技查新：66554700 |