研究者詳細 - 高井　俊和

論文 - 高井　俊和

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Stress-strain Model Adapted to Bolted Connection in Ultimate Behaviour Considering Energy Absorption 査読有り国際誌

Takai T., Tanii K.

IABSE Congress Nanjing 2022 - Bridges and Structures: Connection, Integration and Harmonisation, Report 1465 - 1472 2022年09月

担当区分：筆頭著者,　責任著者記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）

Bolted connection is one of the well-used techniques to connect structural members of steel bridges. Not only load capacity but also energy absorption are important characteristics of the structure to resist seismic action. In a finite element analysis, a true stress-true strain material model is needed to obtain an accurate evaluation in case the structure is exposed to excessive forces and deformed largely, although the true stress-true strain model is almost the same as to nominal stress-strain model in the small strain part. This study proposes a simple true stress-true strain model. And, the validity of the model was confirmed by the compare the finite element analysis and steel material tensile test or tensile experiment of bolted connection. Some true stress-true strain models were investigated and discussed from the viewpoint of load capacity and energy absorption.

DOI： 10.2749/nanjing.2022.1465

Scopus

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Frictional load transfer of high strength bolted connection in post-slip behavior focused on bolt preload 査読有り国際誌

Takai Toshikazu

Proceedings of the 11th International Conference on Bridge Maintenance, Safety and Management (IABMAS 2022) 2093 - 2098 2022年07月

担当区分：筆頭著者,　責任著者記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）

スペインバルセロナ 2022年07月11日 - 2022年07月15日

Bolted connection usually carries the load by frictional load transfer in not only pre-slip behavior but also post-slip behavior. Bolt preload is an important factor because the preload is related to slip resistance. In past experimental research, the ultimate maximum resistance of the bolted connection tightened the bolt without bolt preload was almost the same as that of the connection tightened the bolt with preload. However, the mechanism is unknown yet. In this study, finite element analysis was conducted to clear the mechanism. The bolt axial force during pre-slip and post-slip behavior is changed, and the bolt axial forces of bolted connections tightened the bolt with and without preload are almost the same in ultimate behavior even the bolt preload is different. As a result, the ultimate resistances are almost the same. This result suggests that the loss of the bolt axial force of a part of bolts reduces the slip resistance, but the influence on the ultimate resistance is small.

DOI： 10.1201/9781003322641-259

Scopus

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経年溝形鋼の残留応力とレーシングバーが消失した組立柱の圧縮強度査読有り

中来田宰, 三好崇夫, 岩坪要, 高井俊和, 玉田和也

構造工学論文集Ａ ( 公益社団法人土木学会 ) 68A ( 0 ) 112 - 122 2022年03月

建設から115件が経過する鋼橋組立材の材料特性査読有り

三好崇夫, 岩坪要, 高井俊和, 玉田和也

鋼構造年次論文報告集 29 48 - 57 2021年11月

Measurement method of coating thickness of slipped high strength bolted frictional joint considering statistical characteristics 査読有り国際誌

Takai T., Matsumoto Y.

Bridge Maintenance, Safety, Management, Life-Cycle Sustainability and Innovations - Proceedings of the 10th International Conference on Bridge Maintenaince, Safety and Management, IABMAS 2020 3931 - 3939 2021年04月

担当区分：筆頭著者記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）

Slip resistance of slipped high strength bolted frictional joint is lower than that of un-slipped joint because the coating on the frictional surface is peeled partially by the slip. Coating thickness is one of the most important factors to estimate slip resistance. The coating thickness is usually measured by the film thickness meter. Measured thickness usually varies widely. Measurement method such as measurement position, the number of measurement times is not pre-scripted even if the target of measurement is un-slipped coating. In this study, slip experiment of bolted joint had been executed. Coating thickness on the frictional surface of not only the specimens before the experiment, but also those after the experiment is measured. The number of measurement times to satisfy an accuracy is discussed. Because the peeled degree of coating depends on the position on frictional surface, the measurement position on the frictional surface after slip is also discussed.

DOI： 10.1201/9780429279119-538

Scopus

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Effect of number of additional bolts outside splice plates on behaviour of frictional type bolted joints with a filler plate 査読有り

Moriyama H., Takai T., Yamaguchi T., Kozai S.

Lecture Notes in Civil Engineering 101 1439 - 1451 2021年01月

記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）

In recent steel bridges, for improving productivity and constructability, members which have different dimensions are connected by high-strength bolts or welding. As for bolted joints, it's known that the difference in thickness of connected members is adjusted with loose type or tight type fillers. End of the former plate is aligned on end of splice plates, and the latter is connected to a member with additional bolts outside the joint. However, the difference of the mechanical behaviour between the joint with them isn't clarified. In this study, tensile tests and FEA of high-strength frictional bolted joints with loose and tight filler plates were conducted to investigate the difference of their load transfer mechanism and mechanical performance. From obtained results, it's found that load carrying capacity of joint such as slip coefficient, maximum load was decreased by presence of a filler plate and its connection method, and additional bolts outside splice plates can hardly contribute to the performance enhancement of the joint with a filler plate. So, loose type filler is more preferably used than tight type filler. The effect of additional bolts on the mechanical performance of joint is to equalize the load sharing ratio of splice plates. Therefore, in case that eccentric moment can't be disregarded because thickness of a filler plate is large, tight type filler may prevent failure of the splice plate which is contacted with connected plate.

DOI： 10.1007/978-981-15-8079-6_134

Scopus

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Exploration of novel faying surface treatment for high-strength frictional bolted joints to enhance its after-slip performance 査読有り国際誌

Moriyama H., Sakura R., Yamaguchi T., Toshikazu T., Yamamoto Y.

IABSE Congress, Ghent 2021: Structural Engineering for Future Societal Needs 1684 - 1691 2021年01月

記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）

Welded joints is adopted rather than bolted joints for megastructure's connections because the former can carry large force. However, the former has several problems, such as quality control of welding in situ, which the latter can solve. By contrast, as the load transfer ratio of each bolt becomes uneven proportionally to the number of bolts, local slip around extreme bolts occurs before the whole slip. Extreme bolts to which a large shear force is applied will break before other bolts. For utilizing the strength of all bolts, the problem is solved by improving shear deformation capacity in faying surface with novel surface treatment. Here, the treatment concepts were explored, and the coating's effectiveness was evaluated through friction tests. The deformation capacity can be twice or more than that of conventional treatment, and the slip coefficient doesn't depend on contact pressure. These features have the advantage to give stable slip behaviour.

Scopus

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溝形鋼を用いた組立圧縮材の耐荷挙動について査読有り

岩坪要, 三好崇夫, 高井俊和, 玉田和也

鋼構造年次論文報告集 28 102 - 108 2020年11月

Fundamental study on effect of fabrication tolerance on slip strength of high strength bolted friction type joint with thick plates 査読有り

Takai T., Yamaguchi T., Peng X., Yamashina K.

IABSE Conference, Nara 2015: Elegance in Structures - Report 294 - 295 2015年01月

担当区分：筆頭著者記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）

This study focuses on fabrication tolerance of high strength bolted friction type joint. The investigation of past researches and experimental and FEM analytical results provides statistical characteristics of fabrication variation related to strength of the joint. The characteristic value shows that the variation of the thickness of coating hardly affects the slip strength of the joint. Furthermore, the influence of other variations is evaluated by the FEM analysis. This paper cleared predominant factors of fabrication tolerances affects slip strength of the joint.

Scopus

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Study on slip behaviour of high strength bolted friction type joint with extremely thick plates by using finite element analysis 査読有り

Takai T., Peng X., Sun H., Yamaguchi T.

Assessment, Upgrading and Refurbishment of Infrastructures 2013年01月

担当区分：筆頭著者記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）

High strength bolted friction type joints are commonly used to join members of steel bridge structures. Recently, such joints have become larger, because members of bridges tend to be large to seek structural simplicity. Since large members consist of extremely thick plates, large size joints are needed with many bolts in a line, containing thick plates including splice plates. It is of concern that many bolts and thick plates affect the slip behaviour of such large size joints. So, FEA focused on joints with many bolts and thick plates is carried out. Based on the results, it is clear that a non-uniform distribution of friction force exists. And, it is also shown that a certain combination of thicknesses of connected plates and splice plates has the large capacity of slip resistance. It is concluded that such results can be explained by the influence of the additional bending moment due to thick plates.

Scopus

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