Stress reduction effects of ultra-high performance fiber reinforced concrete overlaid steel bridge deck developed with a new interfacial bond method
Stress reduction effects of ultra-high performance fiber reinforced concrete overlaid steel bridge deck developed with a new interfacial bond method
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DOI：
10.1016/j.conbuildmat.2022.127104
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发表时间：
2022-04
影响因子：
7.4
通讯作者：
P. Deng;H. Mi;H. Mitamura;Takashi Matsumoto
中科院分区：
文献类型：
--
作者：
P. Deng;H. Mi;H. Mitamura;Takashi Matsumoto
通过试验和分析评估了25 mm UHPFRC加铺层对降低开口加劲肋正交异性钢桥面板（OSDs）应力的影响。为了整合UHPFRC覆盖层和OSD，开发了基于粘合剂的粘结技术，并使用拉脱测试和三点弯曲测试进行了预先评估，其中3 MPa的优异粘结强度和不可见的滑移证明了该技术的可靠性。与发达的粘接技术，高达80%的应变减少和峰值削波现象中观察到的应变的关键位置的钢桥面板和结构构件的热点地区，由于UHPFRC。UHPFRC的上级强度和应变硬化效应可以延缓裂缝的萌生和扩展。结果，即使采用薄层，也可以有效地提高OSD的刚度和明显的疲劳寿命延长。
The effects of a 25 mm of UHPFRC overlay on reducing the stress of the open ribs-stiffened orthotropic steel decks (OSDs) are assessed experimentally and analytically. To integrate the UHPFRC overlay and the OSDs, an adhesive-based bonding technique is developed and evaluated beforehand using a pull-off test and a three-point bending test, where a 3 MPa of excellent bond strength and an invisible slip demonstrate the reliability of the technique. With the developed bonding technique, an up to 80% of strain reduction and a peak clipping phenomenon are observed in the strain of the critical locations of the steel deck and structural members in the hotspot areas due to the UHPFRC. In addition, it is found that the superior high strengths and the strain-hardening of UHPFRC can postpone the initiation and propagation of cracks. As a result, an effective enhancement of stiffness of OSDs and an apparent fatigue life extension can be achieved even with a thin layer.