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The study on the repeatability of the corrosion shape of the steel member damaged by the corrosion and the performance evaluation of remaining ultimate strength

腐蚀损伤钢构件腐蚀形状重复性研究及剩余极限强度性能评价

基本信息

批准号：
17560431
负责人：
NOGAMI Kuniei
金额：
$ 2.24万
依托单位：
Tokyo Metropolitan University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2005
资助国家：
日本
起止时间：
2005 至 2006
项目状态：
已结题

项目摘要

In this study, we examined the reproducibility of the corrosion shape of an actual steel members that was corroded and damaged and evaluated its residual load-carrying capacity.In 2005, we first determined in detail the corrosion shape of a bending member that was actually exposed to a corrosive environment, using a newly developed laser equipment. In addition, we performed a bending-load-carrying test for five specimens with different corrosion levels to understand the relationship between the corrosion property and the residual load-carrying capacity. The results obtained are summarized as follows.1) The corrosion shapes of the five steel members'with different corrosion levels that were actually exposed to the corrosive environment were accurately measured using a laser equipment. The wavy and dish-shaped corrosions observed in the flange edge were obtained.2) Ultimate strength tests using the bending members were carried out to examine residual load-carrying capacity and ultimate d … More eformed mode. The residual bending ultimate strength of the corroded members showed a linear relationship with its average corrosion rate.In fiscal 2006, we carried out a ultimate strength test on compressed columns that was actually exposed to a corrosive environment, and determined the corrosion shape. In addition, the corrosion shape of a steel angled member that was exposed to an ocean environment for 19.5 years was determined in detail using the laser equipment, data regarding the corrosion property were accumulated. The results obtained are summarized as follows.1) The corrosion shapes of four steel columns with different corrosion levels that were exposed to the corrosive environment were accurately determined using the laser equipment. The ultimate strength test was carried out to examine residual load-carrying capacity, and ultimate mode using the corroded steel compressed members. The residual bending ultimate strength of the corroded columns showed a linear relationship with its maximum corrosion area rate.2) The corrosion shape of the steel angled member that was exposed to the ocean environment for 19.5 years was measured precisely using the laser equipment. The corrosion characteristics and the change in the corrosion rate in the splash zone, in the tidal zone, and in the undersea zone were determined. Less

在这项研究中，我们检查了腐蚀和损坏的实际钢构件的腐蚀形状的再现性，并评估了其剩余承载能力。2005年，我们首次使用新开发的激光设备，详细确定了实际暴露在腐蚀环境中的弯曲构件的腐蚀形状。此外，我们还对5个不同腐蚀程度的试件进行了弯曲承载试验，以了解腐蚀性能与残余承载能力的关系。所得结果总结如下：1)利用激光设备对实际暴露在腐蚀环境中的5个不同腐蚀等级的钢构件进行了精确的腐蚀形状测量。在法兰边缘观察到波纹状和碟状腐蚀。2)采用弯曲构件进行极限强度试验，考察其残余承载能力和极限变形模态。腐蚀构件的残余弯曲极限强度与其平均腐蚀速率呈线性关系。在2006财政年度，我们对实际暴露在腐蚀环境中的压缩柱进行了极限强度测试，并确定了腐蚀形状。此外，利用激光设备详细测定了暴露在海洋环境中19.5年的钢角构件的腐蚀形状，并积累了有关腐蚀性能的数据。所得结果总结如下：1)利用激光设备对暴露在腐蚀环境中的4根不同腐蚀等级的钢柱的腐蚀形态进行了精确测定。采用腐蚀钢压缩构件进行极限强度试验，考察其残余承载能力和极限模态。腐蚀柱的残余弯曲极限强度与其最大腐蚀面积速率呈线性关系。2)利用激光设备对暴露在海洋环境中19.5年的钢角构件的腐蚀形态进行了精确测量。测定了溅射区、潮汐区和海底区的腐蚀特性和腐蚀速率变化。少