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Development of variability prediction method for initial imperfections of corrosion-damaged steel bridge members

腐蚀损坏钢桥构件初始缺陷变异性预测方法的开发

基本信息

批准号：
21K04243
负责人：
宮嵜靖大
金额：
$ 2.33万
依托单位：
Nagaoka National College of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2021
资助国家：
日本
起止时间：
2021-04-01 至 2024-03-31
项目状态：
已结题

项目摘要

本研究は，鋼橋を構成する鋼部材が腐食損傷した際の溶接残留応力および初期たわみの変動性状を，実験および数値計算により明らかにすることを目的とする．2022年度の研究では，2021年度に実施した板厚12mmのSM490Y材を中空正方形およびI形の断面形状に溶接組立した柱部材の促進腐食試験後の供試体を用いて，その残留応力および初期たわみを測定し，それらを明らかにした．残留応力は，ゲージ長100mmのコンタクトストレインゲージを用いて，供試体断面を短冊状に機械的切断する方法により計測した．また，初期たわみは，供試体断面を構成するそれぞれの板を9×9のマス目上に区切り，その格子点上を変位計による面外たわみによる計測を実施した．対象とした中空正方形およびI形断面供試体の腐食前後の残留応力は，断面を構成する各板の残留応力分布の傾向が大きく変化しないものの，その大きさについては，腐食前後で変化することを確認した．2022年度は，2021年度と2022年度に実施した供試体を解析モデルに置換した非線形有限要素解析を行い，腐食前後の供試体の残留応力および初期たわみの再現を確認する計画であった．しかしながら，残留応力測定作業が当初の計画よりも大幅に時間を要したことに加えて，使用予定としていた解析ソフトウェアMARCによる熱応力解析モデルの作成と解析実行に苦慮しているため，研究進捗が当初の計画に比べて遅れている状況である．この解析ソフトウェアの問題については，熱応力解析を実施するための煩雑な入力作業が必要となる問題点を明らかにしている．この問題に対して，熱応力解析モデル作成用のプリプロセッサの利用が良策であると判断したものの，研究費用や残りの研究期間の関係から，対応が困難である．しかし，対象としたモデル化の作成およびパラメトリック解析は問題なく実施できるため，これらの内容を優先的に行う計画である．

The purpose of this study is to calculate the numerical value of residual welding force and initial dynamic behavior of steel bridge components during corrosion damage. In 2022, SM490 Y materials with a plate thickness of 12 mm and a hollow square and I-shaped cross section were used as test samples after corrosion promotion test of column components. The first step is to measure the residual energy. The residual force is measured by the method of mechanical cutting of the test specimen with a length of 100 mm In the initial stage, the test sample was divided into 9 × 9 sections. The residual stress distribution of hollow square and I-shaped specimens before and after decay has a tendency to change greatly. The residual stress distribution of each plate has a tendency to change greatly. The residual stress distribution of hollow square and I-shaped specimens before and after decay has a tendency to change greatly. The residual stress distribution of hollow square and I-shaped specimens has a tendency to change greatly. The residual stress distribution of hollow square and I-shaped specimens before and after decay has a tendency to change greatly. The residual stress distribution of hollow square and I-shaped specimens has a tendency to change greatly. The residual stress distribution of hollow square and I-shaped specimens before and after decay has a tendency to change greatly. The residual stress distribution of hollow square and I-shaped specimens before and after decay has a tendency to change greatly. The residual stress distribution of hollow square and I-shaped specimens has a tendency to change greatly. The residual stress distribution of hollow square and I-shaped specimens has a tendency to change greatly. The residual stress distribution of hollow square and I-shaped specimens has a tendency to change greatly. The residual stress distribution of hollow square and I-shaped specimens has a tendency to change greatly. The residual stress distribution of hollow square The residual strength of the test sample before and after decay and the initial stage of reproduction were confirmed. The residual force measurement operation is planned to be carried out in a large amount of time, and the thermal force analysis is carried out using predetermined analytical solutions. The problem of thermal stress analysis is necessary for the operation of thermal stress analysis. This problem is related to the thermal stress analysis, the determination of the best way to utilize the thermal stress analysis system, the relationship between the research cost and the research duration, and the difficulty in solving this problem. The content of the project is prioritized.