HRB400E钢筋在受力状态下的锈蚀特征及力学性能退化规律模型构筑  

Corrosion Characteristics and Model Construction of Degradation Law of Mechanical Properties of HRB400E Steel Bars under Stress State

作　　者：曾丁 卢宏宇 周满 王昊 郝保红[2] 苏节江 

机构地区：[1]交通运输部公路科学研究所,北京 [2]北京石油化工学院机械工程系,北京

出　　处：《土木工程》2019年第7期1143-1152,共10页Hans Journal of Civil Engineering

基　　金：交通运输部公路科学研究所科技创新专项资金项目,项目名称:受力钢筋锈蚀的评价方法、标准及力学性能退化模型;项目编号:2018-E0011;北京高等学校高水平人才交叉培养计划项目:基于受力钢筋电化学信号的锈蚀度与力学性能理论计算模型的实桥应用及分级评价;项目编号:2019100170416。

摘　　要：本文通过加力装置对HRB400E试件按照4种不同应力水平进行预加力、加速模拟锈蚀实验、力学性能测试及微观观测,实验结果表明:随着钢筋应力水平的增加,钢筋的腐蚀程度逐渐增大。钢筋的抗拉、屈服强度有不同的退化趋势,伸长率退化较为明显,而且锈后应力水平较大的钢筋,晶相组织较为松散,铁素体的含量增加。In this study,HRB400E specimens are pre-stressed according to four different stress levels,accel-erated corrosion simulation experiment,mechanical property test and microscopic observation by a stress device.The experimental results show that the corrosion degree of reinforcement gradually increases with the increase of stress level of reinforcement.Tensile strength and yield strength of steel bars have different degradation trends;elongation degradation is obvious,and for steel bars with higher stress level after rust,crystalline phase structure is loose and ferrite content increases.

关 键 词：受力钢筋 电化学检测 XRD衍射 力学行为 退化模型 

分 类 号：TU3[建筑科学—结构工程]