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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

第12卷    第5期    总第68期    2015年10月

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文章编号:1672-7029(2015)05-1123-07
钢-混凝土组合箱梁的抗弯疲劳
刘小洁1,2,李亚平1,刘亚茹1,李晓静1

(1.中南大学土木工程学院,湖南长沙 410075;
2.中南大学高速铁路建造技术国家工程实验室,湖南长沙 410075
)

摘 要: 通过3根简支钢-混凝土组合箱梁的静载试验以及重复加载试验,研究分析组合箱梁抗剪连接度对组合箱梁疲劳性能的影响,试验结果表明:重复荷载的反复作用使钢梁和混凝土翼板之间的相对滑移增加,造成组合梁截面刚度下降,挠度增大。在疲劳破坏发生之前,组合箱梁的刚度随加载次数的增加虽有下降,但仍保持线弹性状态,表明部分剪力连接的组合箱梁具有良好的抗疲劳性能,抗剪连接度越大,组合箱梁的抗疲劳性能越好。

 

关键字: 钢-混凝土组合箱梁;疲劳性能;试验研究

Experimental research on fatigue behavior ofsteel-concrete composite box girder
LIU Xiaojie1,2,LI Yaping1,LIU Yaru1,LI Xiaojing1

1. School of Civil Engineering, Central South University, Changsha 410075, China;
2. National Engineering Laboratory of High Speed Railway Construction, Central South University, Changsha 410075

Abstract:The static and fatigue behavior of three steel and concrete composite box griders were studied by experiments. The influence of degree of shear connection on fatigue behavior of steel and concrete composite box girder was investigated. The test results indicate that the relative slip between steel girder and concrete slab would increase because of the repeated loading, which resulted in decrease in sectional stiffness of composite beams. The composite beams behave linearly before fatigue failure. This phenomena indicates that the composite box girder with partial degree of shear connection possesses good fatigue behavior. The larger the degree of shear connection, the better the fatigue behavior of steel-concrete box girder.

 

Key words: steel and concrete composite box girder; fatigue behavior; experimental research

ISSN 1672-7029
CN 43-1423/U

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