The effect of local reinforcing bar reductions and anchorage zone cracking on the load capacity of RC half-joints

The effect of local reinforcing bar reductions and anchorage zone cracking on the load capacity of RC half-joints
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局部钢筋减少和锚固区开裂对钢筋混凝土半节点承载能力的影响

DOI:
10.1016/j.engstruct.2017.09.021
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发表时间:
2017
影响因子:
5.5
通讯作者:
Desnerck P
Desnerck P
中科院分区:
工程技术2区
文献类型:
--
作者:
Desnerck P

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半接头梁,也称为缺口梁,已经成为几项研究的主题,主要集中在新钢筋混凝土梁和桥面的设计优化上。然而,现有的半节点结构往往会出现退化的迹象,并可能表现出不适当的钢筋细节。为了更好地了解局部腐蚀、锚固开裂、有限数量的抗剪钢筋和不适当的钢筋详图的影响,设计了一个测试程序。通过对9根半节点梁的足尺试验,研究结果表明,尽管单个缺陷对钢筋混凝土半节点梁承载力的影响可能不大,但检验人员和评估人员应注意综合影响的可能性。当注意到多个劣化过程和/或提出关于钢筋详图的问题时,对梁承载能力的影响可能大于单个效应的线性组合。
Half-joint beams, also referred to as dapped-end beams, have been the subject of several studies, primarily focussing on the design optimisation of new reinforced concrete beams and bridge decks. Existing half-joint structures, however, often show signs of deterioration and can exhibit improper reinforcement detailing. In order to gain a better insight into the impact of local corrosion, anchorage cracking, limited amounts of provided shear reinforcement, and improper reinforcement detailing, a test program was designed. Full-scale tests on nine half-joint beams were performed.The results of the study show that even though the impact of an individual shortcoming on the load carrying capacity of reinforced concrete half-joint beams might not be substantial, inspectors and assessors should pay attention to the possibility of combined effects. When multiple deterioration processes are noted and/or questions are raised with respect to the reinforcement detailing, the impact on the load carrying capacity of the beam might be larger than the linear combination of the individual effects.
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