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首页> 美国卫生研究院文献>Materials >Static and Fatigue Behavior of Rubber-Sleeved Stud Shear Connectors as Part of Field-Cast Ultra-High Performance Concrete Connections
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Static and Fatigue Behavior of Rubber-Sleeved Stud Shear Connectors as Part of Field-Cast Ultra-High Performance Concrete Connections

机译：现场浇铸超高性能混凝土连接的橡胶套管螺柱剪切连接器的静态和疲劳行为

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摘要

Field-cast ultra-high performance concrete (UHPC) connections are an innovative and prospective solution for combining full-depth precast concrete decks and steel girders. However, previous studies show that the slip capacity of stud shear connectors embedded in UHPC cannot meet the requirements for ductile connectors by Eurocode 4, which can reduce the resistance of steel and concrete composite members. In this study, the rubber-sleeved stud shear connector, which is a composite of ordinary stud and rubber sleeve, was adopted for the field-cast UHPC connections. Push-out tests were conducted to investigate the static and fatigue behavior of the rubber-sleeved stud shear connector as part of field-cast UHPC connections. Results of static tests showed that the rubber-sleeved stud shear connector has sufficient deformation capacity and its slip capacity is 1.5 times that of the ordinary stud shear connector. Compared to ordinary stud shear connectors, UHPC with high strength and stiffness has a relatively small effect on improving the shear strength and stiffness of rubber-sleeve stud shear connectors. Results of fatigue tests showed that the rubber-sleeved stud shear connector in UHPC has similar fatigue behavior to that in normal strength concrete. Though UHPC improves the restraint to the stud deformation, the influence of rubber sleeves is still decisive in determining the fatigue behavior of rubber-sleeve stud shear connectors. In addition, based on the results of strain gauges at stud roots, it was found that the crack initiation process consumes a small proportion of the fatigue life of rubber-sleeved stud shear connectors, which is about 5%.
机译：现场浇铸的超高性能混凝土（UHPC）连接是将全深度预制混凝土桥面板和钢梁结合起来的一种创新且前景广阔的解决方案。但是，以前的研究表明，嵌入到UHPC中的双头剪切连接器的滑动能力不能满足Eurocode 4对延性连接器的要求，这会降低钢和混凝土复合构件的阻力。在这项研究中，现场浇铸的UHPC连接采用了由普通螺柱和橡胶套组成的橡胶套管螺柱剪切连接器。作为现场浇铸的UHPC连接的一部分，进行了推出试验，以研究橡胶套管螺柱剪切连接器的静态和疲劳行为。静态测试结果表明，该橡胶套螺柱剪切连接器具有足够的变形能力，其滑动能力是普通螺柱剪切连接器的1.5倍。与普通的螺柱剪切连接器相比，具有较高强度和刚度的UHPC在改善橡胶套筒螺柱剪切连接器的剪切强度和刚度方面的影响相对较小。疲劳测试结果表明，UHPC中的橡胶套管螺柱剪切连接器具有与普通强度混凝土相似的疲劳行为。尽管UHPC改善了对螺柱变形的约束，但是橡胶套管的影响对于确定橡胶套螺柱剪切连接器的疲劳性能仍然起决定性作用。另外，根据螺栓根部的应变仪的结果，发现裂纹萌生过程消耗了橡胶套螺栓剪切连接器疲劳寿命的一小部分，约为5％。

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