2022 Fiscal Year Final Research Report
Method of retrofitting a corroded high-strength bolt friction-type joint without using a temporary member
| Project/Area Number |
19K04582
|
|---|
| Research Category |
Grant-in-Aid for Scientific Research (C)
|
| Allocation Type | Multi-year Fund |
|---|
| Section | 一般 |
|---|
| Review Section |
Basic Section 22020:Structure engineering and earthquake engineering-related
|
|---|
| Research Institution | Kyushu Institute of Technology |
|---|
Principal Investigator |
Yamaguchi Eiki 九州工業大学, 大学院工学研究院, 教授 (90200609)
|
|---|
| Co-Investigator(Kenkyū-buntansha) |
高井 俊和 九州工業大学, 大学院工学研究院, 准教授 (00759433)
|
|---|
| Project Period (FY) |
2019-04-01 – 2023-03-31
|
| Keywords | 高力ボルト摩擦接合継手部 / 腐食 / 重ね板補強 / コネクタ要素 / すべり荷重 |
|---|
| Outline of Final Research Achievements |
The method of retrofitting a corroded bolted friction-type joint without a temporary member such as a bent is explored. FEA is the mainstay of the research. The validation of the connector element for modeling a bolt is first investigated. The comparison with the results by the solid element and experiment has confirmed that the connector element can simulate a bolt.
A corroded joint model is constructed based on a joint of the existing bridge. Bolts in a part of the splice plate are replaced and the associated plate area is reinforced. This repair is repeated until the retrofit of the whole joint is completed. Various repair patterns are studied numerically, using the connector element. The present research then proposes the retrofit in which the repair starts from the plate near the center of the joint and the bolt line near the center of each plate. For efficiency, up to three bolt lines and the associated plate area can be retrofitted at one time without a temporary member.
|
| Free Research Field |
構造力学
|
| Academic Significance and Societal Importance of the Research Achievements |
ひどく腐食した高力ボルト摩擦接合継手部の事例は多く，高力ボルトと添接板の取り替え工事が行われている．仮支柱等を設置して取替工事を行うのは安全であるが，工事は大がかりになり，工事費も大きくなる．しばしば交通規制が必要となり，大きな社会的コストも発生する．
本研究では，添接板の全ボルトを一気に交換して補強するのではなく，部分的に高力ボルトを取り替え，その部分を順次補強していくレトロフィット工法を提案した．この工法では，ボルト取り外し時の安全性確保のための支柱等の設置，交通規制は特に必要としない．従来工法を大きく改善しており，工学上の意義は大きく，交通規制を要しないため社会的意義も大きい．
|
