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Test research of the fatigue behaviour and anticrack property on thesimply supported-to-continuous beam of the railway

ZHOU Xiang-hua, SHENG Xing-wang(School of Civil Engineering and Architecture, Central South University, Changsha 410075, China)  
In order to study the fatigue behaviour and anticrack property on the simply supported to-continuous beam,the fatigue test and the anticract test on three model beams are carried out.The paper concisely introduces the design and test method of the railway prestressed concrete simply supported-to-continuous model beams.Based on the fatigue test results of three model beams,the stiffness of the structure system and the strain change relation about concrete, reinforceing steel bars and prestressed steel bars especially in the wet joint zones with the variational circles of fatigue load under the normal condition are analyzed and studied.It is concluded that the fatigue load decreases the stiffness of the beams clearly and augments the strain of concrete, reinforceing steel bars and prestressed steel bars.In addition,the effect of the fatigue load on the anticrack property of the key sections especially the wet-joint sections is investgated.It is pointed that the fatigue load decreases the strength of breaking of the wet-joint sections,nevertheless it has no obvious effects on that of the sections of middle span and support.Accordingly,some conclusions and advice are given.
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