Evaluation of seismic performance of existing steel structures considering histories of corrosion and repair

考虑腐蚀和修复历史的现有钢结构抗震性能评估

• 批准号: 17360211
• 负责人: GOTO Yoshiaki
• 金额: $ 8.67万
• 依托单位: Nagoya Institute of Technology
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 2005
• 资助国家: 日本
• 起止时间: 2005 至 2007
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-17360211/
• 关键词: Seismic design; Maintenance; Steel structure; Corrosion; Ductile fracture; Buckling; Geometry measurement; Computational fluid dynamics; 既設鋼構造物; 腐食と補修履歴; 耐震性能; 鋼構造物; 補修履歴; 残存耐力評価

Recently decrepit structures are increasing in number in Japan, because a lot of civil engineering structures that were constructed during the so-called high growth period have become 35-55 years old. Therefore, it is a strong necessity to ensure the seismic safety of these structures by carrying out proper maintenance and upgrading. So far as steel structures are concerned, the corrosion loss of material and the repair of structural members will cause changes of residual stresses and deformations due to redistribution of stresses. These changes of imperfections may have a large influence on the seismic performance of structures. In addition, asymmetry of corrosion and repair in structures will result in 3D. behavior, even if the structures have symmetry at the initial stage. Taking all the above facts into mind, we herein propose a method to evaluate the 3D ultimate behaviors of corroded and repaired structures caused by plasticity, ductile fracture and local buckling. In this method, … More a history of loss and gain of material by corrosion and repair is precisely considered. First, applicability of CFD is examined concerning corrosion environment that causes specific corrosion pattern and magnitude. Second, a new and accurate method is proposed to measure the detailed surface roughness of corroded members. Based on the detailed geometrical data of surface roughness, a prediction method based on the nonlinear FEM analysis is presented to predict the ductile fracture of corroded members. Third, a FEM-based 3D numerical method is proposed to evaluate the seismic performance of corroded and repaired steel structures, where the corrosion and repair processes including jacking up process under dead load can be precisely simulated. Finally, the aforementioned numerical methods are applied to some practical problems, such as the change of welding residual stresses due to the corrosion loss of material and its effect on the strength of thin-walled columns, residual strength of pre-stressed concrete beam with corroded PC steel bars and seismic.performance of corroded steel pipe piles used for -pile piers Less

最近，日本的老旧建筑越来越多，因为在所谓的高增长时期建造的许多土木工程结构已经达到35-55岁。因此，有必要对这些结构进行适当的维护和改造，以确保其抗震安全。对于钢结构而言，材料的腐蚀损失和构件的修复会引起残余应力的变化，并由于应力的重新分布而产生变形。这些缺陷的变化会对结构的抗震性能产生很大的影响。此外，结构的腐蚀和修复的不对称性将导致三维。行为，即使结构在初始阶段具有对称性。考虑到上述事实，本文提出了一种评估腐蚀和修复结构因塑性、韧性断裂和局部屈曲引起的三维极限行为的方法。这种方法更精确地考虑了材料在腐蚀和修复过程中的损益历史。首先，对引起特定腐蚀模式和程度的腐蚀环境进行了CFD的适用性检验。其次，提出了一种新的精确测量腐蚀构件表面粗糙度的方法。基于腐蚀构件表面粗糙度的详细几何数据，提出了一种基于非线性有限元分析的腐蚀构件韧性断裂预测方法。第三，提出了一种基于有限元法的腐蚀修复钢结构抗震性能三维数值评估方法，可以精确模拟钢结构在恒载作用下的腐蚀修复过程，包括顶升过程。最后，将上述数值方法应用于材料腐蚀损失引起的焊接残余应力变化及其对薄壁柱强度、腐蚀PC钢筋预应力混凝土梁残余强度和地震的影响等实际问题。腐蚀钢管桩用于-桩桥墩的性能

项目成果

Change of Weld Residual Stress due to Loss of Material

由于材料损失而导致的焊接残余应力的变化

• 发表时间: 2006
• 期刊: Journal of Structural Engineering, ASCE Vol.132, No.12
• 作者: 小畑誠;安田大樹;永田和寿;後藤芳顯;Yoshiaki Goto and Naoki Kawanishi
• 通讯作者: Yoshiaki Goto and Naoki Kawanishi

柱の3次元繰り返し載荷実験における載荷ならびに変位計測システムの精度に関する考察

柱体三维重复加载实验中加载和位移测量系统精度的思考

• 发表时间: 2005
• 作者: 横井宏彰;江坤生;後藤芳顯;小畑誠
• 通讯作者: 小畑誠

熱流体解析による箱桁内の腐食環境シミュレーション

使用热流体分析模拟箱梁内部的腐蚀环境

• 发表时间: 2007
• 期刊: 構造工学論文集,土木学会 53A
• 作者: 小畑誠;安田大樹;永田和寿;後藤芳顯
• 通讯作者: 後藤芳顯

PC橋脚梁内のPC鋼棒の腐食による力学性能の変化

PC桥墩中PC钢筋腐蚀引起的力学性能变化

• 发表时间: 2006
• 期刊: 第61回年次学術講演会講演概要集,土木学会(第I部門) (CD-ROM)
• 作者: 竹内照造;川西直樹;後藤芳顯
• 通讯作者: 後藤芳顯

MM5による橋梁近傍の気象データの取得についての研究

利用MM5获取桥梁附近气象数据的研究

• 发表时间: 2006
• 期刊: 第61回年次学術講演会講演概要集,土木学会(第I部門) (CD-ROM)
• 作者: 小畑誠;長谷川高士;後藤芳顯
• 通讯作者: 後藤芳顯