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FRP加固具单裂纹RC梁疲劳分析

DOI: 10.3969/j.issn.1674-0696.2014.06.04, PP. 13-17

Keywords: 桥梁工程,裂纹RC梁,能量原理,裂纹影响因子,谐振动,疲劳,bridgeengineering,crackedRCbeam,energyprinciple,crackinfluencefactor,harmonicoscillation,fatigue

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Abstract:

:?通过引入裂纹影响因子来描述裂纹产生的应力集中现象,利用Hamilton能量原理求解加固梁在简谐载荷作用下的位移响应,并将加固梁的动态位移响应与Paris公式相结合,得到了加固梁在简谐载荷作用下裂纹处的应力强度因子和疲劳主裂纹扩展寿命。最后将理论计算结果与有限元分析结果进行对比研究。结果表明,裂纹处的应力强度因子和疲劳主裂纹扩展寿命对载荷较为敏感,且该方法的理论值与有限元模拟的结果吻合得较好。

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