WEKO3
アイテム
座屈拘束ダンパーを用いた鋼橋の耐震補強
https://doi.org/10.18997/00008903
https://doi.org/10.18997/00008903c2454047-28f0-4bc2-a9a4-012a4163919c
| 名前 / ファイル | ライセンス | アクション |
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kou_k_541.pdf (4.3 MB)
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| アイテムタイプ | 学位論文 = Thesis or Dissertation(1) | |||||||
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| 公開日 | 2022-06-09 | |||||||
| 資源タイプ | ||||||||
| 資源タイプ識別子 | http://purl.org/coar/resource_type/c_db06 | |||||||
| 資源タイプ | doctoral thesis | |||||||
| タイトル | ||||||||
| タイトル | Seismic Improvement of Steel Bridges using Buckling Restrained Damper | |||||||
| 言語 | en | |||||||
| タイトル | ||||||||
| タイトル | 座屈拘束ダンパーを用いた鋼橋の耐震補強 | |||||||
| 言語 | ja | |||||||
| 言語 | ||||||||
| 言語 | eng | |||||||
| 著者 |
Sosorburam, Purevdorj
× Sosorburam, Purevdorj
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| 抄録 | ||||||||
| 内容記述タイプ | Abstract | |||||||
| 内容記述 | Many bridges were damaged in the past due to the earthquake. The damage was investigated in the aftermath, and seismic design codes were upgraded whenever found necessary. There exist many bridges designed by the old codes. The safety of such bridges under seismic loading are to be assessed based on the revised seismic design codes. The bridge must be retrofitted if the seismic performance is found unsatisfactory. The damper is one of the typical tools to improve the seismic performance of the structure. In this conjunction, the buckling restrained bracing （BRB） is getting popular in the field of building engineering. Following buildings, the application of BRB to a bridge has been explored, yet it is still quite limited. BRB can be used as a damper as well. In such a case, it may be called the buckling restrained damper （BRD）. BRD is not a structural member; it is an attachment to the member. Hence it is better suited to retrofitting work. Yet, such an application has not been explored much so far. To study the application of the BRD, two types of steel bridges are considered in the present study. The first bridge is a simply supported steel truss bridge with a span of 74.4 m. The seismic behavior of the truss bridge under the large seismic loading is obtained by the nonlinear dynamic analysis, and the member safety is judged by Specifications for Highway Steel Bridges, the design codes in Japan. The numerical results indicate that some members in the original bridge would possibly be damaged. The BRDs are then installed. As for their locations, three cases are considered: （1） at the fixed bearings; （2） at the roller bearings; and （3） at both ends of the bridge. BRDs consist of an elastic part and a yielding core. For each of the three cases, a parametric study is conducted with two parameters of the length and the cross-sectional area of the yielding core, and the effectiveness of BRD is evaluated. Four values are given to each parameter. Therefore, 48 different truss bridges with BRDs are analyzed. It is observed that BRD is more effective with a longer yielding core and a larger cross-section. While in all the three cases of the BRD locations, the bridge has been found no damage with some designs of the BRD, Case （3） is the most effective, as the number of BRD designs that make the bridge performance satisfactory is largest. The second bridge is a steel arch bridge. The bridge is 300 m long with a central span of 220 m. The bridge has a reinforced concrete deck of 13.5 m in width and 250 mm in thickness at the top. The two ends of the arch member are simply supported by fixed bearings. The nonlinear dynamic analysis has revealed Because of the support conditions, the upper part of the bridge moves largely due to the earthquake. BRDs are therefore applied to the superstructure at its two ends to suppress that movement. A parametric study is conducted, in which four values are given to each of the two parameters, the length and the cross-sectional area of the yielding core. Out of the 16 BRD designs, the length of 6,000 mm and the cross-sectional area of 20,000 mm2 of the yielding core reduce the damage most, yet there remain 5 damaged members. Reviewing the damage pattern, another four BRDs are installed in the middle part of the arch bridge. Four lengths and three cross-sectional areas of the yielding core are employed for the parametric study. It has been then revealed that three BRD designs successfully would make all the members stay intact. It is not simple and easy to improve the seismic performance of the truss bridge and the arch bridge. That is why still many of truss bridges and arch bridges have not been retrofitted yet. The present study has confirmed the effectiveness of BRD to improve the seismic performance of those bridges, providing a new possible choice for their retrofit work. The thesis consists of five chapters. Chapter 1 states the background and the objective of the present research. Chapter 2 presents the literature review of the retrofitting method with the seismic energy dissipation device. Chapters 3 and 4 deal with a steel truss bridge and a steel arch bridge, respectively. Their seismic performances when submitted to a large earthquake are investigated by the nonlinear dynamic analysis. BRDs are applied to improve their seismic performances. In Chapter 5, the conclusions drawn from this study are presented. | |||||||
| 目次 | ||||||||
| 内容記述タイプ | TableOfContents | |||||||
| 内容記述 | 1. Introduction||2. Literature review||3. Improvement of Seismic Performance of Steel Truss Bridge||4. Improvement of Seismic Performance of Steel Arch Bridge||5. Conclusions and Future work | |||||||
| 備考 | ||||||||
| 内容記述タイプ | Other | |||||||
| 内容記述 | 九州工業大学博士学位論文 学位記番号: 工博甲第541号 学位授与年月日: 令和4年3月25日 | |||||||
| キーワード | ||||||||
| 主題Scheme | Other | |||||||
| 主題 | buckling restrained damper | |||||||
| キーワード | ||||||||
| 主題Scheme | Other | |||||||
| 主題 | seismic retrofit | |||||||
| キーワード | ||||||||
| 主題Scheme | Other | |||||||
| 主題 | steel truss bridge | |||||||
| キーワード | ||||||||
| 主題Scheme | Other | |||||||
| 主題 | steel arch bridge | |||||||
| キーワード | ||||||||
| 主題Scheme | Other | |||||||
| 主題 | seismic performance | |||||||
| キーワード | ||||||||
| 主題Scheme | Other | |||||||
| 主題 | nonlinear dynamic analysis | |||||||
| アドバイザー | ||||||||
| 山口, 栄輝 | ||||||||
| 学位授与番号 | ||||||||
| 学位授与番号 | 甲第541号 | |||||||
| 学位名 | ||||||||
| 学位名 | 博士（工学） | |||||||
| 学位授与年月日 | ||||||||
| 学位授与年月日 | 2022-03-25 | |||||||
| 学位授与機関 | ||||||||
| 学位授与機関識別子Scheme | kakenhi | |||||||
| 学位授与機関識別子 | 17104 | |||||||
| 学位授与機関名 | 九州工業大学 | |||||||
| 学位授与年度 | ||||||||
| 内容記述タイプ | Other | |||||||
| 内容記述 | 令和3年度 | |||||||
| 出版タイプ | ||||||||
| 出版タイプ | VoR | |||||||
| 出版タイプResource | http://purl.org/coar/version/c_970fb48d4fbd8a85 | |||||||
| アクセス権 | ||||||||
| アクセス権 | open access | |||||||
| アクセス権URI | http://purl.org/coar/access_right/c_abf2 | |||||||
| ID登録 | ||||||||
| ID登録 | 10.18997/00008903 | |||||||
| ID登録タイプ | JaLC | |||||||
