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高性能鋼の特性を活用した鋼製ラーメン橋脚隅角部の設計手法開発に関する研究

利用高性能钢的特点开展钢刚构桥墩角部设计方法研究

基本信息

批准号：
15760350
负责人：
小野潔
金额：
$ 2.3万
依托单位：
Osaka University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Young Scientists (B)
财政年份：
2003
资助国家：
日本
起止时间：
2003 至 2004
项目状态：
已结题

项目摘要

昨年度は,鋼製ラーメン橋脚隅角部の脚部に着目して正負交番載荷実験を行い耐震性能の把握をおこなった.さらに,高性能鋼として狭降伏点レンジー低降伏比鋼(SN鋼)を対象とし,SN鋼から材料試験片を作成し,高性能鋼の材料としての繰返し塑性履歴特性の把握を行った.本年度は,各種力学パラメータ,従来の構造用鋼材と高性能鋼といった各種鋼材の機械的性質が鋼製ラーメン橋脚隅角部の耐力および変形性能に与える影響を幅広い観点から検討するため,鋼材の塑性履歴特性を精度よく再現できる構成式を用いた弾塑性有限変位解析により,その特性の把握を行った.なお,解析の信頼性を向上させ,従来の構造用鋼材と高性能鋼の機械的性質の違いを適切に解析結果に反映させるため,解析で使用する鋼材の構成則のパラメータは昨年度の鋼材の繰返し載荷実験から決定した.また,疲労耐久性を向上させる観点から鋼製橋脚隅角部の構造の検討が行われている.その疲労耐久性を考慮した隅角部の耐震性能を確認することが必要である.そこで,研究代表者である小野は,別の研究で疲労耐久性を考慮した隅角部の耐震性能確認実験を行い,その実験結果と解析結果との比較により解析手法の妥当性の検証も行った.実験結果と解析結果との比較を行った結果,隅角部の荷重-変位関係,座屈変形性状等について解析結果が実験結果の特徴を精度良く表現できていることが確認できた.そして解析結果および実験結果を基に検討を行った結果,隅角部の柱部に座屈変形が生じなくとも隅角部のウェブパネルの変形が大きくなると隅角部に過大な残留変位が生じることが明らかとなった.よって,隅角部の耐震設計においては,地震後の復旧性,修復性の関係から,隅角部に積極的に塑性化を認めるべきではないということが判明した.また,高性能鋼としてSN鋼を対象として検討を行った.隅角部に積極的に塑性化を認める設計法であればSN鋼の特性を生かした設計法の提案が可能であるとも考えられたが,塑性化を積極的に認めない範囲においては,SN鋼を使用することによって実設計上,大幅な隅角部の耐震性能の向上を期待することは難しいと考えられる.

Last year, the corners of the feet, the corners of the feet. "High performance", "narrow drop point", "low drop ratio" (SN), "image", "SN", "material", "sheet", "high performance", "materials", "return" plastic properties, "grasp the performance." This year, the mechanical properties of all kinds of high-performance mechanical equipment are used in this year. This year, the mechanical properties of all kinds of high-performance machines are used in this year. This year, the mechanical properties of all kinds of high-performance machines are used in this year. This year, the mechanical properties, mechanical properties, mechanical Grasp the characteristics of the line. The purpose of this paper is to analyze the reliability of the use of high-performance mechanical equipment. The results of the analysis reflect the performance of the machine, and the results reflect the performance of the machine. The results show that the performance of the machine reflects the performance of the machine. The result of the analysis reflects the performance of the machine, and the result of the analysis is that the use of the material will lead to the return of the material for the year. Wear and tear durability up and down the corner of the foot. The fatigue durability test confirms that the earthquake resistance of the corner is necessary. The representative of the study, the representative of the study, asked Ono to study the fatigue durability test and confirm the earthquake resistance at the corner of the test. the results of the analysis were compared with those of the analytical method of appropriateness. The results of the analysis of the results were compared with the results of the comparison of the results, the load in the corner, the shape of the flexion, and so on. the results showed that the accuracy was good. The results of the analysis of the results show that the results show that the column in the corner is in the shape of a flexion, and the corner is in the shape of a large residue in the corner. In the corner, the earthquake resistance design is designed to prevent the earthquake, the old and the repairable after the earthquake, and the active plasticization in the corner. High-performance, high-performance, low-performance, high-performance, low-performance, low-performance, high-performance, high-performance, low-performance, low-performance, high-performance, high-performance, low-performance, high-performance, high-performance, low-performance, low-performance, high-performance, low-performance, low-performance, high-performance, low-performance, low-performance, high-performance, low-performance, high-performance, low-performance, In the corner, there is an active method of plasticizing and confirming the setting method. The proposal of the method of setting the characteristic of the SN may be used in the corner. The proposal of the method may lead to the increase of the temperature, the range of the temperature, the temperature range of the SN, the design of the corner, the seismic performance of the corner, the earthquake resistance of the corner, the earthquake resistance of the corner.