Development of Seismic Retrofitting Method and Proposal of Seismic Performance Evaluation Method for Steel Bridge Piers Corrected by Heating

加热校正钢桥墩抗震加固方法的发展及抗震性能评价方法的提出

• 批准号: 16360231
• 负责人: KIM You-chul
• 金额: $ 9.6万
• 依托单位: Osaka University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 2004
• 资助国家: 日本
• 起止时间: 2004 至 2005
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-16360231/
• 关键词: Repair; Reinforcement; Heating correction; Residual imperfection; Buckling strength; Ultimate strength; Buckling mode

In Hanshin-Awaji earthquake (1995), many members of large steel structures were damaged. After the earthquake, the local buckling deformations of many members were rapidly corrected by heating and pressing. However, correcting large deformation like buckling, the ultimate strength of the members is unknown. So it is necessary to confirm safety and reliability of members corrected by heating.A series of compressive tests was carried out for virgin cruciform column and one corrected by heating. According to the results, buckling deformation modes of projection panels corrected by heating were variously changed by the degree of residual imperfection. And deformations up to the ultimate situation of corrected projection panels became larger than those of virgin panels. However, the ultimate strength of projection panels corrected by heating was almost equal to those of virgin materials.To elucidate the reason why the compressive behavior of specimens corrected by heating differs from that … More of virgin specimens, elastic-plastic large deformation analysis was carried out. When considering only residual imperfection, the experimental phenomena could not be simulated. Then considering not only residual imperfection but also the rise of yield stress made by work hardening, the experimental phenomena could be simulated totally. From the analysis, it was elucidated that the reason why the buckling mode of specimens corrected by heating changed was both residual imperfection and the increase of yield stress made by work hardening.In order to verify the major factors affecting compressive behavior of box column corrected by heating, a series of experiment was carried out and it was simulated by elastic-plastic large deformation analysis. The results were same tendency as the case of cruciform column. It was elucidated that two factors as residual imperfection and increase of yield stress involved in large plastic deformation dominated the compressive behavior of the steel members corrected by heating.The alternative load test was carried out for the structural model of a bridge pier with considering the knowledge obtained from cruciform column and box column.According to the results, if heating temperature was made to be under A1 transformation temperature at heating correction, residual imperfection could be largely corrected by using water without spoiling the mechanical properties. Whether the ultimate strength was decreased or not was decided by the magnitude of the local deflection which was remained without completely corrected by heating. Therefore, although the restoration to the original state was desirable to be as complete as possible to the original state, if the complete restoration was difficult, heating correction to the opposite direction of buckling should be performed somewhat larger. Less

在Hanshin-Awaji地震（1995年）中，许多大型钢结构的成员损坏了。地震后，许多成员的局部屈曲变形通过加热和压力迅速纠正。但是，纠正诸如屈曲之类的大变形，成员的最终强度是未知的。因此，有必要确认通过加热纠正的成员的安全性和可靠性。对Virgin Cruciform柱进行了一系列压缩测试，并通过加热进行了校正。根据结果​​，通过剩余不完美的程度，通过加热校正的投影板的屈曲变形模式改变了。直到校正投影面板的最终情况的变形变得比原始面板的变形更大。然而，通过加热校正的投影面板的最终强度几乎等于原始材料的投影面板。要阐明通过加热与之纠正的样品的压缩行为的原因……更多的原始标本，弹性 - 塑性大变形分析。当仅考虑残留缺陷时，无法模拟实验现象。然后，不仅考虑了残留的缺陷，而且还可以完全模拟实验现象所产生的屈服压力的增加。从分析中可以阐明，通过更换加热校正的标本的屈曲模式既是残留的不完美，又是工作硬化产生的屈服压力的增加。结果与十字形柱相似。已经阐明了两个因素作为残留不完美和涉及大型塑性变形的屈服应力的增加，主导了通过加热校正的钢构件的压缩行为。替代负载测试是针对桥梁码头的结构模型进行的替代负载测试，并考虑到从十字形柱中获得的知识，并从杂物柱中获得的知识和盒子的盒子进行了临时，如果取暖的温度在临床下进行了临床，则在暖气中延伸了升温的温度。使用水而不会破坏机械性能。是否降低了最终强度，这取决于局部挠度的大小，而局部偏转的幅度是没有通过加热完全校正的。因此，尽管对原始状态的恢复是希望对原始状态尽可能完整的，但是如果完全恢复很困难，则应更大的加热校正向相反的屈曲方向。较少的

项目成果

Compressive Behavior of Box Column Corrected Local Buckling Damage by Heating

箱形柱的压缩行为通过加热修正了局部屈曲损伤

• 发表时间: 2006
• 期刊: Proceedings of 61st Annual Conference of Japan Society of Civil Engineers 1
• 作者: Ippei Maruyama;Ryoichi Sato;Hidetoshi Ito;金 裕哲;廣畑幹人;KIM You-Chul;HIROHATA Mikihito
• 通讯作者: HIROHATA Mikihito

Safety Evaluation of Cruciform Columns Corrected by Heating

加热校正十字形柱的安全性评价

• 发表时间: 2004
• 期刊: Transaction of JWRI 33-1
• 作者: Ippei Maruyama;Ryoichi Sato;Hidetoshi Ito;金 裕哲;廣畑幹人;KIM You-Chul;HIROHATA Mikihito;金 裕哲;KIM You-Chul;KIM You-Chul;KIM You-Chul;金 裕哲;KIM You-Chul
• 通讯作者: KIM You-Chul

加熱矯正された十字柱突出板の圧縮挙動

热矫直交叉柱凸板的压缩性能

• 发表时间: 2006
• 期刊: 鋼構造論文集 13-49
• 作者: Ippei Maruyama;Ryoichi Sato;Hidetoshi Ito;金 裕哲
• 通讯作者: 金 裕哲

加熱矯正が十字柱突出板の座屈および終局強度に及ぼす影響

热矫直对十字形凸板屈曲及极限强度的影响

• 发表时间: 2004
• 期刊: 鋼構造論文集 11-44
• 作者: Ippei Maruyama;Ryoichi Sato;Hidetoshi Ito;金 裕哲;廣畑幹人;KIM You-Chul;HIROHATA Mikihito;金 裕哲;KIM You-Chul;KIM You-Chul;KIM You-Chul;金 裕哲
• 通讯作者: 金 裕哲

Effects of Heating Correction on Buckling and Ultimate Strength of Cruciform Column Projection Panels

加热校正对十字柱凸板屈曲及极限强度的影响

• 发表时间: 2004
• 期刊: Steel Construction Engineering 11-44
• 作者: Ippei Maruyama;Ryoichi Sato;Hidetoshi Ito;金 裕哲;廣畑幹人;KIM You-Chul;HIROHATA Mikihito;金 裕哲;KIM You-Chul;KIM You-Chul;KIM You-Chul;金 裕哲;KIM You-Chul;KIM You-Chul
• 通讯作者: KIM You-Chul