轨道桥梁HRB400钢筋疲劳特性研究  

Research on fatigue characteristics of HRB400 rebar of rail bridges

作　　者：赵泳茗 ZHAO Yongming(China Civil Engineering Construction Corporation,Beijing 100038,China)

机构地区：[1]中国土木工程集团有限公司,北京100038

出　　处：《工程建设》2023年第5期17-21,共5页Engineering Construction

摘　　要：为研究轨道桥梁工程HRB400钢筋的疲劳性能,本文开展了不同直径(16、32 mm)下的HRB400钢筋疲劳试验。首先分析了不同钢筋夹持处理方法的优缺点,然后基于物理模型试验和双折线数学模型构建了不同直径钢筋的疲劳性能S-N曲线,最后研究了直径效应对HRB400钢筋疲劳特性的影响规律。研究结果表明:1)相比去肋光滑处理和螺纹处理方法,铣扁法处理夹持段的试验成功率更高;2)双折线模型能有效描述钢筋疲劳性能演化过程段部位;3)HRB400钢筋于同一应力范围下的疲劳寿命随钢筋直径的增加而减小。本文研究成果可为HRB400钢筋于轨道桥梁工程中的应用提供一定的理论参考。In order to study the fatigue performance of HRB400 rebar in rail bridge engineering,the fatigue tests of HRB400 rebar with different diameters(16 mm and 32 mm)are carried out.Firstly,the advantages and disadvantages of different rebar clamping methods are analyzed,and then the fatigue performance S-N curves of rebar with different diameters are studied based on physical model test and double-line mathematical model.Finally,the influence law of diameter effect on the fatigue characteristics of HRB400 rebar is studied.The results show that:1)Compared with the rib smoothing treatment and thread treatment method,the test success rate of the clamping section treated by the milling flat method is higher;2)The double-fold line model can effectively describe the evolution process of rebar fatigue characteristics;3)The fatigue life of HRB400 rebar under the same stress range decreases with the increase of rebar diameter.The results can provide a theoretical reference for the application of HRB400 rebar in rail bridge engineering.

关 键 词：HRB400钢筋 疲劳特性 轨道桥梁 试验研究 

分 类 号：TU973.23[建筑科学—结构工程]