Experimental Study on Impact Load Resistance of RC Beam with Corroded Reinforcement
Experimental Study on Impact Load Resistance of RC Beam with Corroded Reinforcement
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DOI：
10.1051/matecconf/20164702004
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发表时间：
2016-04
期刊：
影响因子：
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通讯作者：
Isao Kuwahara;Hiroki Tamai;Y. Sonoda
中科院分区：
文献类型：
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作者：
Isao Kuwahara;Hiroki Tamai;Y. Sonoda
在日本，许多混凝土桥梁沿着海岸线已遭受腐蚀，由于氯化物的攻击，从海水和空气中的盐。因此，目前国内外对锈蚀钢筋混凝土结构的研究正在进行中。特别是作为基础性研究的锈蚀钢筋混凝土梁静载承载力的数值计算和试验方法，已成为国内外学者研究的热点。然而，几乎没有研究来评估冲击载荷抵抗能力。当然，如果考虑到自然灾害中的冲击荷载作用于锈蚀钢筋混凝土结构的可能性，那么明确其抗冲击荷载能力是很重要的。基于这样的背景，本文对锈蚀钢筋混凝土梁的结构性能进行了试验研究。准确地说，在本研究中，钢筋锈蚀钢筋混凝土梁与锈蚀钢筋电解腐蚀的方法，并进行静载试验和重复冲击试验，以澄清它们的静态和冲击荷载的能力。因此，我们可以得到一些发现。首先，通过反复冲击试验（冲击速度为1.0m/s，钢筋重量为100 kg），锈蚀钢筋混凝土梁的破坏次数不到健康钢筋混凝土梁的一半。同时还发现，由于腐蚀产生的轴向裂纹，导致断裂模式完全不同。此外，即使腐蚀速率相同，由于腐蚀裂纹的存在和形式，与静载荷抵抗能力相比，冲击载荷抵抗能力大大降低。
In Japan, many concrete bridges along the coastline have suffered corrosion due to the chloride attack from seawater and airborne salt. Therefore, now, several researches on corroded RC structures have been ongoing around the world. Especially, as a basic research, many researchers have studied on the numerical and experimental method to evaluate static load resistant capacity of RC beams with corroded reinforcements. However, there has been almost no research to evaluate impact load resistant capacity. Of course, it is important that impact load resistant capacity is clarified, if the possibility of acting of impact load including in natural disaster on corroded RC structures is dealt with. With a background like this, this paper describes an experimental investigation of the structural behavior of corroded RC beams. To be precise, in this study, RC beams with corroded reinforcement by using electrolytic corrosion method were made, and both of static loading test and repeated impact test for those RC beams were conducted in order to clarify the static and impact load resistant capacity of them. As a result, we could get some findings. At first, through repeated impact tests (which has 1.0m/s impact velocity and a 100kg steel weight), the number of impacts to the failure of corroded RC beams were less than half of healthy RC beams. It was also found that fracture pattern was completely different due to some axial cracks by corrosion. In addition, even though the corrosion rate is same level, the impact load resistant capacity reduce greatly compared to the static load resistant capacity because of the existence and pattern of cracks due to corrosion.