Experimental investigation on fatigue of concrete cantilever bridge deck slabs subjected to concentrated loads
Experimental investigation on fatigue of concrete cantilever bridge deck slabs subjected to concentrated loads
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DOI：
10.1016/j.engstruct.2015.02.010
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发表时间：
2015-04
影响因子：
5.5
通讯作者：
Francisco Natário;M. F. Ruiz;A. Muttoni
中科院分区：
文献类型：
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作者：
Francisco Natário;M. F. Ruiz;A. Muttoni
在准静态荷载作用下进行试验时，已观察到剪切通常是无抗剪钢筋的桥梁RC悬臂桥面板承受集中荷载时的主要失效模式。然而，集中荷载的重型车辆具有重复性，造成刚度损失和潜在的强度降低，由于疲劳现象。一个具体的实验方案，包括集中疲劳载荷下的11个测试和4个静态测试（参考标本）。结果表明，悬臂桥面板的剪切疲劳破坏的敏感性显着低于梁没有抗剪钢筋。一些楼板由于钢筋断裂而失败。它们在第一次钢筋失效后表现出显著的剩余寿命，并最终由于剪切而失效。最后，将试验结果与2010年《混凝土模型规范》的剪切疲劳条款和临界剪切裂纹理论进行了比较，以讨论它们的适用性。
Shear has been observed to be often the governing failure mode of RC cantilever deck slabs of bridges without shear reinforcement subjected to concentrated loads when tested under a quasi-static application of the load. However, concentrated loads of heavy vehicles have a repetitive nature, causing loss of stiffness and potential strength reductions due to fatigue phenomena.In this paper, the fatigue behavior of cantilever bridge deck slabs is investigated. A specific experimental programme consisting on eleven tests under concentrated fatigue loads and four static tests (reference specimens) is presented. The results show that cantilever bridge deck slabs are significantly less sensitive to shear-fatigue failures than beams without shear reinforcement. Some slabs failed due to rebar fractures. They presented significant remaining life after first rebar failure occurred and eventually failed due to shear. The test results are finally compared to the shear-fatigue provisions of thefib-Model Code 2010 and the Critical Shear Crack Theory to discuss their suitability.