橋本 国太郎 | ![]() |
ハシモト クニタロウ | |
大学院工学研究科 市民工学専攻 | |
准教授 | |
土木・建築工学関係 |
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既往の研究では乾燥処理をしたGFRPに,-5~40℃(1サイクル14時間)の熱サイクルを70回以上与えると引張強度および曲げ強度が低下すると示されているが,この熱付与時間に関する規定や乾燥処理の有無による影響はよくわかっていない.そこで本研究では,熱付与時間と含水量に着目し,GFRPの一方向材と二方向材を対象に乾燥処理の有無および1サイクル時間を変化させた熱サイクル付与試験を行う.熱付与後,引張試験と曲げ試験を行い,対象材料の機械的性質の変化とその要因を解明することを目的としている.試験の結果,乾燥処理をしない場合は,試験体の水分量の影響により,引張・曲げともに熱付与時間による機械的性質の明瞭な変化は見られず,乾燥処理をした場合には,熱付与時間が強度に影響を与える可能性があることがわかった.
公益社団法人 土木学会, 2022年05月, 土木学会論文集A1(構造・地震工学), 78 (5), II_42 - II_53, 日本語[査読有り]
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The stress state around a rib-to-deck (RD) joint in an orthotropic steel bridge deck is extremely sensitive to wheel-load location in the transverse direction. Fatigue cracks of various types can occur around the RD joint. In this study, a bending fatigue-test system was used to simulate an RD joint under the critical-load case. The fatigue tests for two groups of RD joint specimens with weld-penetration ratios of 15 and 75% were conducted to assess the influence of the penetration ratio on the fatigue-crack type and its fatigue resistance. Fatigue-test results suggest that the fatigue resistances of the RD joint specimens with 75 and 15% penetration ratios were approximately Class B and between Class C and Class D, respectively, per Japanese standards. Furthermore, results show that increasing the weld-penetration ratio can prevent root-to-throat fatigue cracks and enhance the fatigue resistance RD joints.
American Society of Civil Engineers (ASCE), 2018年02月01日, Journal of Bridge Engineering, 23 (2), 英語[査読有り]
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Pultruded Fiber Reinforced Polymers (FRPs) have been increasingly used in civil infrastructure applications due to advanced properties such as high specific strength, lightweight and especially high corrosion resistance. In highly corrosive environment such as chemical and acid environment where metallic by-products are prone to corrosion, the use of adhesive bonding in addition to FRP bolts not only decreases the structure's weight, limits the impacts of aggressive environment but also increases the ultimate strength of the connection and improves the connection stiffness. In this paper, mechanical behavior of pultruded FRP double-lap specimens combined by only FRP bolt as well as both FRP bolt and adhesive under tension tests was investigated by finite element method and experimental data. Two kinds of used adhesive were high strength adhesive and low elastic one. Results show that comparing with bolt-only specimens, connections with both FRP bolt and adhesive had the higher joint strength. Specimens with high strength adhesive had the highest joint strength but the shear out failure and delamination at FRP plates happened suddenly while the low elastic adhesive specimens witnessed the debonding failure and shear out failure alternately in the both sides of connections. Moreover, the stress distributions in the GFRP plates were also investigated and there were good agreements between finite element analysis (FEA) and experimental data achieved in this paper.
AMER INST PHYSICS, 2017年, PROCEEDINGS OF THE INTERNATIONAL CONFERENCE OF GLOBAL NETWORK FOR INNOVATIVE TECHNOLOGY AND AWAM INTERNATIONAL CONFERENCE IN CIVIL ENGINEERING (IGNITE-AICCE'17): SUSTAINABLE TECHNOLOGY AND PRACTICE FOR INFRASTRUCTURE AND COMMUNITY RESILIENCE, 1892, (10pages,CD - R), 英語[査読有り]
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In this paper, an experimental study was carried out to investigate the remaining performance of frictional high strength bolted joints in an existing weathering steel bridge used for thirty years. Bolt axial forces, slip coefficients and slip strengths were measured for the real bolted joint specimens cut from the bridge to carry out a slip test and a bolt calibration test. The results of these tests showed that remaining bolt axial forces of many bolts were less than the design bolt axial force but the slip coefficients were more than the design value. Therefore the tests found the slip strength of all joints remained the design strength.
土木学会, 2016年03月, 構造工学論文集, 62A, 482 - 491, 日本語[査読有り]
研究論文(学術雑誌)
本研究では,FRP歩道橋の振動使用性を検証するため,加振実験から得た時系列データをもとに振動特性の推定を行う.また,気温変化が振動特性に及ぼす影響についても検討を行う.得られた加速度データに多次元ARモデルを適用し,推定された固有振動数からStabilization Diagram (SD)やStability Criteria (SC)を用いて,安定度の高い振動特性を抽出し,日常的使用に際しては使用性に問題がないことを確認した.また,気温変化により固有振動数が変化することを確認した.さらに,対象橋梁の固有振動解析の結果から,FRPのような軽量で高い強度を持つ材料を主材料とするトラス歩道橋の格点部補強による全体振動特性への影響が大きいことが分かった.格点部補強したFRP橋梁のFEモデル化には,補強による剛性の変化を正しく考慮する必要があることを示した.
土木学会, 2016年02月, 土木学会論文集A2(応用力学論文集), 71 (2), I_841 - 848, 日本語[査読有り]
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本研究では,実構造に適用された鋼管集成橋脚のせん断パネルに着目し,せん断パネルの幅厚比パラメータやアスペクト比,さらには,フランジウェブ板厚比などの構造パラメータが変化した場合の本橋脚の耐震性能を検討することを目的としている.本論文では,既往の実物大のせん断パネルの実験結果を基にせん断パネルの解析モデルを構築し,せん断パネルの各種構造パラメータを変化させた正負交番挙動解析および地震応答解析によって,本構造の変形性能やエネルギー吸収能などの耐震性能を解析的に検討した.
パラメトリック解析に基づき,アスペクト比の影響を考慮したせん断パネルの限界せん断ひずみの推定式を新たに提案した.また,地震応答解析結果よりせん断パネルの各構造パラメータと応答値との関連性を見出した.
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Clustering stud shear connectors with minimized spacing based on specifications to form group studs are useful for concrete slab prefabrication and prestress installation efficiency in steel-concrete composite bridges. To date, many long-span composite bridge girders have been designed with wide transverse cantilevers and web spacing, and most of these girders use group studs. The concrete's self-weight and the weight of moving loads result in a significant transverse bending-induced effect generally consisting of bending stresses and tensile concrete cracks. In this sense, the studs are actually under longitudinal interlayer shear force that is influenced by the transverse bending-induced effect. This biaxial loading effect has not been investigated experimentally. Thus, standard and newly designed push-out tests and corresponding analyses were carried out. In addition, the stud arrangement effect also was of concern. In this study, the ratio of stud height to shank diameter was approximately 6.2. This study found that steel-concrete interlayer friction and biaxial concrete compression around the stud roots contribute to a favorable effect of biaxial loading on stud performance. However, the residual tensile concrete cracks are unfavorable. Engineers should note the tendency toward mechanical degradation of studs when such a situation occurs. Moreover, arranging studs in clusters to form group studs may lead to comparatively more severe concrete damage at the ultimate stage. The specification-based evaluations of stud strength were found to be more or less conservative based on related test results. (C) 2014 American Society of Civil Engineers.
ASCE-AMER SOC CIVIL ENGINEERS, 2015年10月, JOURNAL OF BRIDGE ENGINEERING, 20 (10), 英語[査読有り]
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In this research, to study the thermal behavior such as thermal stress and deformation of composite bridges with a SRC structure, a field measurement and a FE analysis were carried out for the composite trussed rohze bridge constructed by using weathering steel. In the field test, the temperatures of the surface on the bridge members were measured by an infrared camera. And then, FE analysis model was constructed by the temperature data of the field test, and FE analysis was carried out to investigate the thermal stress and deformation due to changing the thermal condition. The field test showed the value of measured temperature difference was higher than the design value. FE analysis indicated the bridge members under the dead, live and thermal load suffered under the influence of the thermal stress.
土木学会, 2015年03月, 構造工学論文集, 61A, 816 - 828, 日本語[査読有り]
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Numerous fatigue cracks were observed recently in orthotropic steel bridge decks that have been in service for a long period of time. A fatigue crack initiating from the rib-to-deck (RD) joint may especially produce asphalt surfacing damage, and hence have an impact on traffic safety. In fatigue evaluation of RD joints, in most current design specifications the asphalt surfacing is just treated as a layer dispersing wheel loads, in which the wheel loads are uniformly distributed on the deck plate and the effect of the composite stiffness of the deck plate and asphalt surfacing is neglected. In this study, comprehensive finite-element and load models were used to investigate the asphalt surfacing influence on the wheel load dispersal and composite stiffness. The analysis result shows that wheel loads are not uniformly distributed on deck plates but are concentrated on the weld joints, the asphalt surfacing could significantly decrease the stress magnitude around the RD joints, and this decrease may mainly result from composite stiffness rather than load dispersal. The effective stresses of RD joints, and their fatigue evaluation indicate that the fatigue life of RD joints could be drastically improved by asphalt surfacing. However, on the other hand, the fatigue life is shortened considerably by the effects of temperature. Moreover, the type of fatigue crack initiating from the weld root may also be influenced by the asphalt surfacing. (C) 2014 American Society of Civil Engineers.
ASCE-AMER SOC CIVIL ENGINEERS, 2014年10月, JOURNAL OF BRIDGE ENGINEERING, 19 (10), 英語[査読有り]
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Corrosion damages have been frequently occurrd at end parts of steel girders. So it is frequently used for repair and strengthening works of steel bridges that adding the bracket members, patch plates with epoxy resin. As girder end has narrow space, it is required the simple and rational repair method of the steel girder end with the corrosion damage. In order to make clear load carrying capacity of a steel girder with corrosion damage at the girder end and repaired steel girders, the loading experiments has been carried out. The specimens modelled a steel girder end which are designed with actual size are prepared. It is concluded that the load carrying capacity of the simple and rational repair method is as same as that of the former repair method.
土木学会, 2014年03月, 構造工学論文集, 60A, 94 - 104, 日本語[査読有り]
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Recently in seismic retrofitting or strengthening for not only ordinal steel bridges but also weathering steel bridges, new steel members are connected by high strength bolts. But it is little known that slip coefficient and treatment method of contact surfaces of the weathering steel bridge and the new ordinal steel members. Therefore to show the slip coefficient of the high strength frictional bolted joints with two different treated contact surface between the weathering steel and the ordinal steel, slip test was conducted. From the slip test, it was found that the contact surface of the weathering steel is treated by scouring the rust off as much as possible and the contact surface of the new steel members is treated by aluminum spray to obtain higher slip strength.
土木学会, 2014年03月, 構造工学論文集, 60A, 632 - 641, 日本語[査読有り]
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This study investigated how damage changes the modal parameters of a real bridge by means of a field experiment which was conducted on a real steel truss bridge consecutively subjected to four artificial damage scenarios. In the experiment, both the forced and free vibrations of the bridge were recorded, the former for identifying higher modes available exclusively and the latter for lower modes with higher resolution. Results show that modal parameters are little affected by damage causing low stress redistribution. Modal frequencies decrease as damage causing high stress redistribution is applied; such a change can be observed if the damage is at the non-nodal point of the corresponding mode shape. Mode shapes are distorted due to asymmetric damage; they show an amplification in the damaged side as damage is applied at the non-nodal point. Torsion modes become more dominant as damage is applied either asymmetrically or on an element against large design loads. © 2013 Taylor & Francis Group, London.
2013年06月, 11th International Conference on Structural Safety & Reliability, CD - ROM, 8pages, 英語[査読有り]
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In this study, to show the impact coefficient and stress redistribution of steel truss bridges when truss members of the bridges fracture, a field test used existing steel truss bridge was conducted. To measure the dynamic force responses of the members in the fracture test, the dynamic strains of the members were measured by dynamic data loggers. The truss members which were a middle vertical member and a neighbor vertical member of the bridge were cut off by gas cutter. The result of the field test showed the actual value of impact coefficient and stress redistribution due to fracture of the truss members.
土木学会, 2013年03月, 構造工学論文集, 59A, 180 - 189, 日本語[査読有り]
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In this study, to investigate frictional behavior and maximum strength of GFRP members connected by high strength bolts and splice plates made of stainless or GFRP plates, slip test and bolt relaxation test are carried out. And FE analysis is executed to study on mechanism of stress concentration. From the slip test, slip coefficient of the specimen with stainless splice plates is lager than 0.4 and it is found that the slip coefficient can calculate by toribology theory. From the FE analysis, the maximum strength of the GFRP firictional bolted joint can estimate based on consideration of stress concentration. Relaxation test for one year provides the amount of decrements of the bolt axial forces of each connection.
土木学会, 2012年03月, 構造工学論文集, 58A, 935 - 945, 日本語[査読有り]
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Many steel structures have been faced to the problem of superannuation in Japan. Severe damages will be caused in these structures subjected to huge earthquakes. It is necessary to secure safety of these structures to such earthquakes. Two-dimensional horizontal behavior of seismic response of structures with damages by corrosion has been hardly researched. Therefore, in this study experiments and numerical analyses intended for rectangular steel bridge piers with damages in the corners were conducted in order to evaluate two-dimensional behavior. As a result, it was clarified that the decrease of strength of steel piers with damages by corrosion was remarkable.
土木学会, 2012年03月, 構造工学論文集, 58A, 299 - 309, 日本語[査読有り]
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In this paper, in order to study on bending behaviors of a riveted steel girder with corrosion damage at heads of some rivets, bending loading tests are carried out. The steel girders used as specimens were cut out from the bridge that had been used for 55 years. Considering the results of the bending experiment, it is found that the initial rigidity of the specimen with the rivet heads corroded is decreased a little. But the effect of corrosion damage at rivet heads of riveted steel I shaped girder for ultimate load is nothing.
土木学会, 2012年03月, 構造工学論文集, 58A, 701 - 709, 日本語[査読有り]
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研究論文(学術雑誌)
[査読有り]
研究論文(学術雑誌)
[査読有り]
研究論文(研究会,シンポジウム資料等)
[査読有り]
研究論文(研究会,シンポジウム資料等)
研究論文(研究会,シンポジウム資料等)
[査読有り]
研究論文(学術雑誌)
[査読有り]
研究論文(学術雑誌)
[査読有り]
研究論文(国際会議プロシーディングス)
Steel plates with varied thickness have a potential for rationalization of steel bridge design. For example, longitudinally profiled steel plates already have been adapted to flanges of an I-shaped girder / a box girder to reduce the weight of the bridge and the process of bridge construction. Recently, the analytical study on the mechanical behavior of steel girders with a transversely profiled web plate has been carried out, and it has been concluded that there exists the preferable cross sectional shape of steel plate from the viewpoint of the load carrying capacity and ductility. In this paper, the static loading tests for I-shaped girders with a profiled web plate in thickness are carried out. It is found that the web plate whose thickness is larger at the middle height of the girder has superiority for shear buckling strength; on the other hand, that the web plate whose thickness is larger at the close to flange plate has superiority for bending strength.
公益社団法人 土木学会, 2009年08月, Proceedings of the 8th Japanese German Bridge Symposium, 55, 9pages, CD - ROM, 英語[査読有り]
研究論文(国際会議プロシーディングス)
研究論文(研究会,シンポジウム資料等)
Steel plates with varied thickness have a potential for rationalization of steel bridge design. For example, longitudinally profiled steel plates already have been adapted to flanges of an I-shaped girder / a box girder to reduce the weight of the bridge and the process of bridge construction. Recently, the analytical study on the mechanical behavior of steel girders with a transversely profiled web plate has been carried out, and it has been concluded that there exists the preferable cross sectional shape of steel plate from the viewpoint of the load carrying capacity and ductility. In this paper, the static loading tests for I-shaped girders with a profiled web plate in thickness are carried out. It is found that the web plate whose thickness is larger at the middle height of the girder has superiority for shear buckling strength; on the other hand, that the web plate whose thickness is larger at the close to flange plate has superiority for bending strength.
土木学会, 2009年03月, 構造工学論文集, 55A, 144 - 153, 日本語[査読有り]
研究論文(学術雑誌)
CFT (Concrete Filled Steel Tubular members) has attracted much attention because of its structural superiority. However, the increase of weight by filling with concrete inside is one of problem associated with CFT. Thus in this study, to reduce the self-weight of CFT, CFDT (Concrete Filled Double-Skin Steel Tubular members) is proposed particularly for higher bridge piers. The purpose of this study is to clarify the influence of the thickness of outer and inner steel tubes on the bending characteristics by the cyclic loading test and the analysis. As a result, it is shown by the cyclic loading test that CFDT has higher bending strength and energy absorption than CFT of the same weight. CFDT without inner tube has sufficient bending strength, but after the crush of the concrete, its ductility declines like only outer tube. By the constraint effect of concrete, buckling of inner tube is prevented, so the thickness of inner tube can be thin. For reasonable structure, it is effective to make the outer tube thicker than inner tube.
土木学会, 2009年03月, 構造工学論文集, 55A, 670 - 679, 日本語[査読有り]
研究論文(学術雑誌)
[査読有り]
研究論文(研究会,シンポジウム資料等)
[査読有り]
研究論文(国際会議プロシーディングス)
[査読有り]
研究論文(国際会議プロシーディングス)
[査読有り]
研究論文(国際会議プロシーディングス)
[査読有り]
研究論文(国際会議プロシーディングス)
[査読有り]
研究論文(学術雑誌)
[査読有り]
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[査読有り]
研究論文(学術雑誌)
[査読有り]
研究論文(学術雑誌)
[査読有り]
研究論文(学術雑誌)
[査読有り]
研究論文(国際会議プロシーディングス)
[査読有り]
研究論文(学術雑誌)
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研究論文(国際会議プロシーディングス)
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速報,短報,研究ノート等(学術雑誌)
[招待有り]
記事・総説・解説・論説等(商業誌、新聞、ウェブメディア)
[招待有り]
記事・総説・解説・論説等(商業誌、新聞、ウェブメディア)
[招待有り]
記事・総説・解説・論説等(商業誌、新聞、ウェブメディア)
[招待有り]
記事・総説・解説・論説等(商業誌、新聞、ウェブメディア)
土木学会 複合構造委員会「FRPと鋼の接合方法に関する調査研究小委員会(H211)」では,FRP構造物の接合方法,および補修・補強を目的としたFRPと鋼部材の接合方法に対して,設計事例,国内外の設計基準,研究開発の動向を調査・研究し,接合部の評価方法を整理して性能照査型設計法の策定に向けた基礎資料を提供することを目的として2年3カ月間活動を行ってきた.本報告では,小委員会でとりまとめた報告書「複合構造シリーズ09 FRP部材の接合および鋼とFRPの接着接合に関する先端技術」(第1部:FRP部材接合の設計思想と強度評価,第2部:鋼構造物の補修・補強のためのFRP接着接合の評価)について,その概要を説明する.
Japan Society of Civil Engineers, 2014年05月, 土木学会論文集A1(複合構造論文集), 70 (5), II_120 - II_133, 日本語記事・総説・解説・論説等(学術雑誌)
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