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EXPERIMENTAL STUDY OF BRIDGE STRUCTURAL MEMBERS STRENGTHENED WITH HIGH??PERFORMANCE FERROCEMENT
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摘要: 对用高性能水泥复合砂浆钢筋网加固的混凝土桥梁受弯构件进行正截面等幅疲劳研究。通过对4根加固试件和2根未加固对比试件的试验,研究了这种加固技术对混凝土桥梁构件受弯疲劳性能的影响和作用。试验结果表明,加固后试件的疲劳变形有所减小,试件的疲劳抗裂性能也得到较大提高。介绍了采用这种加固方法的施工工艺,试验证实,加固施工只要满足简单的操作规程就不会发生剥离破坏。根据试验分析,得到了加固试件在疲劳荷载作用下正截面疲劳强度验算试验回归公式。Abstract: The bending response of bridge structural members strengthened with high??performance ferrocement considering fatigue load were experimentally investigated. The test included eight bridge structural members strengthened with ferrocement and two control members without strengthening. And performances of the members are compared and assessed with particular emphasis on cracking behavior, mid??span deflection, and the modes of failure and so on. The results showed that ferrocement could obviously increase the crack??resisting capacity, and improve the bending stiffness of members. A few point of view on construction techniques for the method are given here also. And according to the conclusion of experiments, debonding failure will not occur if the strengthening operations obey just simple rules. Through analyses and derivation, it has been obtained a regressive formula of checking fatigue strength of normal sections for strengthened beams under fatigue loading.
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Key words:
- bridge structural members /
- ferrocement /
- strengthening /
- fatigue /
- crack
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