超低温环境下钢筋力学性能试验研究  

EXPERIMENTAL STUDY OF MECHANICAL PROPERTIES OF REINFORCING STEELS AT CRYOGENIC TEMPERATURES

作　　者：谢剑[1,2] 韩晓丹[1] 裴家明[1] 雷光成 

机构地区：[1]天津大学建筑工程学院土木工程系,天津300072 [2]天津大学滨海土木工程结构与安全教育部重点实验室,天津300072

出　　处：《工业建筑》2015年第1期126-129,172,共5页Industrial Construction

基　　金：国家自然科学基金资助项目(51078260)

摘　　要：采用液氮降温的方式,对HRB335、HRB400以及特种低温钢筋共21组63个试件进行不同温度下的拉伸试验,分析不同种类钢筋在20,-40,-80,-100,-120,-140,-165℃下的力学性能及变化趋势。试验研究表明:随着温度降低,三种钢筋的屈服强度fy和抗拉强度fu均呈增大趋势,钢筋的断后伸长率δ5和断后收缩率ψ减小,说明钢筋的塑性随着温度降低而降低;三种钢筋的弹性模量与温度相关性不大,其值基本围绕着某一定值上下波动;不同温度下钢筋的应力-应变曲线的形状基本类似,但随着温度的降低,钢筋的极限应变不断减小,这也说明钢筋的塑性呈减小趋势。Based on the tensile test of 63 steel specimens at different temperatures from 20 ℃ to -165 ℃, mechanical properties and changing trend of three types steel bars (HRB335, HRB400 and cryogenic reinforcements ) were analyzed.The results showed that the yield strength fy, the ultimate strength fu of the steel bars increased whereas the percentage elongation after fracture δ5 , percentage reduction of area ψdecreased with the temperature decreasing , which means the reducing plasticity of steel bars .The influence of temperature on elastic modulus was little and the elastic modulus fluctuated around a certain value .The shape of the stress-strain curve changed little at different temperatures , however , the cooling environment led to the reducing plasticity and improving brittleness , reflected in the dropping ultimate strain .

关 键 词：超低温 钢筋 拉伸试验 屈服强度 极限强度 应力-应变曲线 

分 类 号：TU511.32[建筑科学—建筑技术科学]