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1995年坂神淡路地震中，许多大型钢结构构件受损。地震发生后，许多构件的局部屈曲变形通过加热和加压迅速得到纠正。然而，校正大变形如屈曲，构件的极限强度是未知的。本文对未使用过的十字形柱和加热后的十字形柱进行了一系列的受压试验。结果表明，投影板热校正后的屈曲变形模式随残余缺陷程度的不同而不同。修正后的投影板在极限状态下的变形比未修正的投影板大。但经过加热修正后的投影板的极限强度与原始材料的极限强度相差不大，为了解释加热修正后的投影板的压缩性能与原始材料的压缩性能不同的原因， ...更多信息 对原始试件进行了弹塑性大变形分析。当只考虑残余缺陷时，不能模拟实验现象。这样，不仅考虑了残余缺陷的影响，而且考虑了加工硬化引起的屈服应力的升高，就可以完全模拟实验现象。分析表明，残余缺陷和加工硬化引起的屈服应力的增加是导致热校正试件屈曲模式发生变化的主要原因，为了验证影响热校正箱形柱受压性能的主要因素，进行了一系列试验，并采用弹塑性大变形分析进行了模拟。结果与十字形柱的情况相同。分析了残余缺陷和塑性大变形引起的屈服应力增加是影响加热矫正后钢构件受压性能的主要因素，并结合十字形柱和箱形柱的经验，对桥墩结构模型进行了交变荷载试验，结果表明，残余缺陷和塑性大变形引起的屈服应力增加是影响加热矫正后钢构件受压性能的主要因素。如果在加热校正时使加热温度低于A1转变温度，则可以通过使用水来很大程度地校正残余缺陷，而不会损害机械性能。极限强度是否降低取决于加热后未完全修正的局部挠度的大小。因此，虽然恢复到原始状态是希望尽可能完全恢复到原始状态，但如果完全恢复是困难的，则应该执行稍微更大的向屈曲的相反方向的加热校正。少

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

Ultimate Strength of Cruciform Column Projection Panels Corrected by Heating

加热修正十字柱投影板的极限强度

• 发表时间: 2005
• 期刊: Proceedings of 3rd International Symposium on Steel Structures ISSS'05 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
• 通讯作者: KIM You-Chul