呼伦贝尔地区持续高寒气候条件下HRB400级钢筋的力学性能试验研究  

Study on the Physical and Mechanical Properties of HRB400 Steel Bar under Continuous Alpine Climate in Hulubuir

作　　者：方明伟 王重阳 王丹 王祖玉 Fang Mingwei;Wang Chongyang;Wang Dan;Wang Zuyu(Hulunbuir University,Hailar,Inner Mongolia 021008)

机构地区：[1]呼伦贝尔学院工程技术学院,内蒙古海拉尔021008

出　　处：《呼伦贝尔学院学报》2020年第6期67-72,共6页Journal of Hulunbuir University

基　　金：2018年呼伦贝尔学院科学技术和研究项目“呼伦贝尔地区持续高寒天气条件下HRB400级钢筋物理力学性能的研究”(2018FDYB07);2019年内蒙古自治区高等学校科学技术研究项目“呼伦贝尔地区工程冻害及冻土工程地质条件分析评价”(NJZY19232)。

摘　　要：呼伦贝尔地处高纬度高寒地带,秋冬季节更替引起室外温度骤变。为研究持续低温后温度骤变(从-40℃骤变到20℃以上)对钢筋的影响,采用微机控制万能电子试验机对不同型号HRB400钢筋(■12、■14、■16)的冷冻后进行拉拔试验。试验结果表明:温度骤变使钢筋的屈服强度σy和抗拉强度σu均有所提高,断后伸长率δ和断面收缩率ψ均有所减小,说明温度骤变使钢筋强度一定程度的提高,使塑性一定程度的降低;温度骤变对钢筋的弹性模量E影响不明显,且应力-应变曲线的形状基本类似。Hulubuir is located in the high latitude and cold zone.The change of autumn and winter causes the temperature sudden change.In order to study the effect of temperature sudden change(from-40℃to sudden change than 20℃)on reinforcement after continuous low temperature,a microcomputer-controlled universal electronic testing machine was used to conduct the post-freezing pull-out test of steel bars.The test results show that the yield strengthσy and the tensile strengthσu of the reinforcement increase with the sudden change of temperature,the elongation after fractureδand reduction of areaψof steel bar decrease to some extent,the results show that the strength of reinforcement increases with the sudden change of temperature,and the plasticity decreases with the sudden change of temperature.The effect of temperature change on elastic modulus E is not obvious,and the shape of stress-strain curve is basically similar.

关 键 词：高寒地带 温度骤变 屈服强度 断面收缩率 应力应变曲线 

分 类 号：TU50[建筑科学—建筑技术科学]