SRC组合加固铰缝疲劳性能试验

EXPERIMENT ON THE FATIGUE BEHAVIOR OF SRC COMPOSITE CONSOLIDATED HINGED JOINTS

  • 摘要: 针对装配式板梁桥铰缝,提出一种型钢混凝土组合(SRC)对铰缝进行加固的技术方法。为了研究SRC组合铰缝加固方法的加固效果,进行了不同加固方式的静力及疲劳试验。试验研究发现:SRC加固后的铰缝在强度、整体受力性能及疲劳性能等方面优于其他加固方式的铰缝;同时,根据不同加固方式后铰缝的破坏现象、以及铰缝的力-变形关系曲线识别了加固后铰缝的两种典型破坏形态,即结合面弯剪破坏和结合面弯曲破坏,并分别建立了两种破坏形态下铰缝的强度预测模型。误差分析表明两个模型计算结果精确、可靠,可为铰缝的工程设计计算提供参考。

     

    Abstract: A technique of a steel reinforced concrete consolidated hinged joint in prefabricated slab bridges was proposed. To research the consolidation effect of this new method, specimens of different reinforcement methods were tested with static and fatigue loading. Based on the experimental results, it is found that the hinged joint specimens with SRC exhibited better bearing capacity, global deformation capacity and fatigue capacity than other reinforced joints. Meanwhile, based on the damage phenomena, force-deformation relationships observed during static tests on different ways of reinforced joints, two typical failure patterns were identified, that is, interfacial flexural failure and interfacial flexural-shear failure. Two analytical strength models were established corresponding to the aforementioned two failure patterns. Error analysis shows that these two models give accurate and reliable predictions, which can provide practical references for the seismic design of joints.

     

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