摘要
为了研究高温下600 MPa级高强钢筋的力学性能,通过拉伸试验,研究了600 MPa级高强钢筋在20℃、150℃、225℃、300℃、400℃、500℃、600℃、700℃和800℃等9种不同温度下应力-应变曲线、弹性模量、屈服强度、极限强度、断面收缩率和伸长率等力学性能的变化规律.试验表明:随着温度的升高,钢筋断口剪切唇区逐渐规则;当温度为150℃时,600 MPa级高强钢筋应力-应变曲线仍然存在屈服台阶,而温度大于225℃时无屈服台阶;600 MPa级高强钢筋屈服强度、极限强度以及弹性模量随温度的升高而逐渐减小,伸长率随温度的升高而增大,断面收缩率随温度的升高是先增大后减小.最后基于试验数据,得到了高温下600 MPa级高强钢筋弹性模量、屈服强度、极限强度、断面收缩率和伸长率等力学参数随温度变化的计算公式以及高温本构模型.
The tensile test of 600 MPa grade high strength rebar steel at high temperature was conducted to study the mechanical properties at various temperatures(20℃,150℃,225℃,300℃,400℃,500℃,600℃,700℃,800℃,respectively),and the mechanical properties,including tensile-strain relationships,elastic modulus,yield strength,ultimate strength,percentage elongation after fracture,average elongation percentage,were obtained.Experimental results indicate that the shear lip area of fracture is gradually regulated with the increase of temperature.When the temperature is less than or equal to 150℃,the stress-strain curve of 600 MPa grade high strength rebar steel have obvious yielding step,and when the temperature is greater than 225℃,there is no yielding step.The yield strength,ultimate strength,and elastic modulus decrease with the temperature increasing,meantime,percentage elongation after fracture,average elongation percentage of 600 MPa grade high strength rebar steel increase with the temperature increasing.Based on the experimental results,the formulae predicting yield strength,ultimate strength,elastic modulus,average elongation percentage of 600 MPa grade high strength rebar steel affected by temperature and the high-temperature constitutive model at high temperature were proposed.
作者
孙传智
王可卿
乔燕
董学娥
SUN Chuanzhi;WANG Keqing;QIAO Yan;DONG Xuee(Department of Architecture Engineering ,Suqian College,Jiangsu Suqian 223800,China;Suqian Housing and Urban-Rural Development Bureau,Jiangsu Suqian 223800,China)
出处
《西安建筑科技大学学报（自然科学版）》
北大核心
2019年第3期355-361,共7页
Journal of Xi'an University of Architecture & Technology(Natural Science Edition)
基金
2015年江苏省第十二批六大人才高峰项目(2015-JZ-019)
宿迁市科技支撑计划项目(Z2018098)
江苏省第五期“333高”层次人才培养工程“科研项目”
关键词
高强钢筋
高温
力学性能
高温本构模型
high strength steel
high temperatures
mechanical properties
high-temperature constitutive model
作者简介
第一作者:孙传智(1976-),男,博士,副教授,主要从事工程结构抗震与大跨桥梁承载力评估研究.E-mail:schzh_xzh@163.com.
