鋼構造論文集

H形鋼弱軸柱・強軸梁交叉型接合部パネルのせん断耐力に関する実験的研究

山田秀明, 松尾彰

2004 年 11 巻 43 号 p. 1-7
発行日: 2004/09/24
公開日: 2010/06/28

DOIhttps://doi.org/10.11273/jssc1994.11.43_1

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The shear strength of the panel of various sections of the columns are newly proposed and listed in Recommendations for Design of Connections in Steel Structures(2001) published by Architectural Institute of Japan(AIJ). However, the shear strength of the panel of weak-axis H-column is not listed in this Recommendation. In this paper subassemblages of several panel aspect ratios consisting of weak-axis H-column and strong-axis H-beam are tested by cyclic horizontal load under the several axial forces of the column. Elastic-plastic behaviors of the connection panels are reported.

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鋼板貼付けによる既設円形断面鋼製橋脚の耐震補強法に関する実験的研究

忠和男, 櫻井孝昌

2004 年 11 巻 43 号 p. 9-17
発行日: 2004/09/24
公開日: 2011/03/01

DOIhttps://doi.org/10.11273/jssc1994.11.43_9

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A stiffening Method of existing cylindrical steel piers is studied by experimental and analytical ways. On the experimental way steel piers are stiffened by rectangular steel plates on it. The Stiffening structures are set using the plates and local buckling points are created forcibly the pier. The part of the pier which yields local buckling is controlled in base zone of it by this stiffening structures and the ductility of the piers are improved with small increase the ultimate strength of it. We have been able to improve the ductility of piers by the stiffening structures.

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フラツシュ溶接システムを用いた圧延H形鋼継手部の曲げ強度と靭性

奥健太郎, 金裕哲, 梅國章

2004 年 11 巻 43 号 p. 19-24
発行日: 2004/09/24
公開日: 2010/06/28

DOIhttps://doi.org/10.11273/jssc1994.11.43_19

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No cracks occurred in the joints of the small specimens at -40°C, -20°C and the room temperature. Therefore, it was elucidated that the unwelded zone on the upset metal did not lower bending strength of the joints. The jointed members had enough bending strength without fracture in the full plastic moment. Although the critical CTOD of the welds was lower than that of the base metal, it recovered to that of the base metal by PWHT. Although Charpy absorbed energy at 0°C was about 30J, it became over 100J by PWHT. The critical CTOD of the flash welded joints could be accurately estimated from the Charpy energy of flash welded joints from the equation that was proposed for HAZ of the arc welding.

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現場混用接合形式角形鋼管柱梁接合部の高力ボルト接合部における応力伝達に関する研究

江見卓郎, 田渕基嗣, 田中剛, 難波尚, 長谷洋司

2004 年 11 巻 43 号 p. 25-40
発行日: 2004/09/24
公開日: 2010/06/28

DOIhttps://doi.org/10.11273/jssc1994.11.43_25

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This study is planed to clear the behaviour of friction joints with high strength bolts on web bolted flange welded (WBFW) connections. Test parameters are the width to thickness ratio(D/t ratio) of the column and existence of weld connection between shear plate and beam web. And to make clear detailed behaviour, FEA is carried out. The results are briefly shown: when the D/t ratio is large, it has little effect on the behaviour of the WBFW connection. But in the case of web welded connection, flexural strength of the connection increases as the D/t ratio decreases. This phenomena is caused by increasing of the moment which is transmitted in beam web. Proposed evaluation of flexural strength in this paper is good correspondence with the test results.

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CFRP板接着による鋼板亀裂補修効果への板厚の影響に関する解析的研究

野阪克義, 古川喬朗

2004 年 11 巻 43 号 p. 41-48
発行日: 2004/09/24
公開日: 2010/06/28

DOIhttps://doi.org/10.11273/jssc1994.11.43_41

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In order to investigate the effects of strengthening of steel plates by bonding Carbon Fiber Reinforced Polymer (CFRP), analytical studies were conducted. In this study, either a continuous steel plate or two steel plates butted each other were strengthened, or retrofitted by bonding CFRP strips, and loaded in tension. The influences of the thickness of steel plates and the number of layers of CFRP strips on the stress reduction and simulated crack opening behaviorwere investigated by conducting parametric finite element analyses. The analytical results indicated that the shear stress in the adhesive layer varied as the thickness of the steel plates increased for the specimens having the same strengthening ratio, Sr. In addition, approximately Sr=1.2 were recommended for retrofitting steel plates to effectively use the adhesive strength, i.e., adhesives both at the end of the CFRP and at the simulated crack yield simultaneously.

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鋼2主鈑桁橋横桁部における場所打ちPC床版の応力性状

利根川太郎, 小保田剛規, 沖井宏成

2004 年 11 巻 43 号 p. 49-61
発行日: 2004/09/24
公開日: 2011/03/01

DOIhttps://doi.org/10.11273/jssc1994.11.43_49

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Cast-in-place prestressed concrete slab is mainly adopted to 2- girder bridges with the aim of rationalization and labor-saving. However, it is reported that cracks sometimes occur near by rigid cross beams several months after construction because of concrete's creep and shrinkage under restraint from the rigid beams and vertical stiffeners. In recent years, it is reported that sunshine is supposed to induce the deformation of PC slab, and it is one of the reason of cracks. In this paper, stress conditions and efficiencies of prestressing in PC slab are evaluated by finite element analysis. The results indicate that cast in place PC slab near cross beams should be designed reducing live load stress and recognizing range of temperature of slab by sunshine.

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曲線2主I桁橋の設計に関する検討

中田知志, 勝俣徹, 長井正嗣

2004 年 11 巻 43 号 p. 63-73
発行日: 2004/09/24
公開日: 2010/06/28

DOIhttps://doi.org/10.11273/jssc1994.11.43_63

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Two-I-girder bridges is becoming increasingly popular in these daysdue to its economic advantage. However the use of this type bridge is limitted to straight bridges in plan. This paper describes trial design and FEM analysis of a curved bridge with 50m single span, where the applicability to the curved span is investigated. From this study, the possibility of application of this type of bridge to curved bridges is made clear, as far as bridges having such curvatures as those classical type is concerned.

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開口を有する鋼板耐・制震壁の開口部必要補剛剛性

宇田川邦明, 木ノ本仁志, 西田明美

2004 年 11 巻 43 号 p. 75-85
発行日: 2004/09/24
公開日: 2011/03/01

DOIhttps://doi.org/10.11273/jssc1994.11.43_75

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Structural deformation control under earthquakes has been conducted recently by connecting steel shear walls or steel wail-type dampers with steel frames. These steel shear walls have sometimes an opening for functional or design requirement. The steel walls with the opening enframed properly have higher ultimate strength and more plastic deformations than those of the steel walls without the opening. We analyze numerically elastic-plastic behaviors of the steel shear walls with the various types of openings using the FEM program. From the analytical results, we propose a design formula for obtaining the required rigidity of the surrounding frame of the openings to ensure that the steel shear walls would have enough elastic stiffness and ultimate strength. In the analyses, 400Mpa-grade and 100Mpa-grade steels are adopted. Furthermore, the elastic-plastic behaviors of the steel walls having the opening strengthened by the frame are compared with those of the non-opening walls with rib-plates.

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鋼桁ウェブの圧縮耐荷力

久保全弘, 渡辺孝一, 小島裕樹, 白木祐次

2004 年 11 巻 43 号 p. 87-97
発行日: 2004/09/24
公開日: 2010/06/28

DOIhttps://doi.org/10.11273/jssc1994.11.43_87

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Rolled steel members with a compact H-section are widely used for supporting frames of bridge erection and temporary earth retaining systems. In such structures the jack up point or crossing point of members is subjected to localized compressive load. The resistance of an unstiffened web is governed by one of failure modes (crushing, crippling and buckling). This paper presents the experimental results using compact rolled beams and welded steel beams with large slenderness. The load-displacement behavior, stress distribution, failure mode and ultimate load are investigated for the member with seven different sections. Considering the effective width under edge loading, a simple predicting formula is proposed based on plate bucking theory.

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コンクリート充填鋼管長柱の変形性能評価法

藤本利昭

2004 年 11 巻 43 号 p. 99-105
発行日: 2004/09/24
公開日: 2011/03/01

DOIhttps://doi.org/10.11273/jssc1994.11.43_99

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In order to evaluate the deformation capacity of a concrete filled steel tubular slender column, investigation of a previous restoring force characteristic model and a evaluating equation of deformation capacity was conducted. Firstly, the application scope of the previous model and the evaluating equation were clarified. Consequently, it was understood that the restoring force characteristic model could be applied to CFT slender columns. However, it was thought that the evaluating equation of deformation capacity was inapplicable to CFT slender columns. Then, the evaluating method of deformation capacity of CFT slender columns was proposed based on the previous restoring force characteristic model and a evaluating equation.

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鋼構造における基礎梁の鉄骨化に関する研究―近似構造計算法の提案―

大石浩史, 山田大彦, 小幡昭彦

2004 年 11 巻 43 号 p. 107-115
発行日: 2004/09/24
公開日: 2010/06/28

DOIhttps://doi.org/10.11273/jssc1994.11.43_107

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The present study is focused on the structural design of steel structures with steel foundation-girders, and the purpose is to propose an appropriate technique for the stress analysis of the structures subjected to static seismic load taking the effect of soil-pilestructure interaction into consideration based on Chang's formulae. It is clarified that the combined approximations of uniform horizontal displacement with the rotational rigidities of the junctions of column-base and foundation-girders give accurate evaluations to the deformations and stresses of both the structures and the pile foundations.

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FEM解析を用いた鋼多主桁橋の設計合理化の検討

村越潤, 高橋実, 吉岡勉, 野中哲也, 加藤修

2004 年 11 巻 43 号 p. 131-145
発行日: 2004/09/24
公開日: 2010/06/28

DOIhttps://doi.org/10.11273/jssc1994.11.43_131

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By recent development of design tools by computer, FEM analysis has been widely used in structural design for various structures. From the point of view of rational design of steel girders, FEM-based design combined with optimization procedure is expected to be more effective than that based on beam theory analysis. In this study, a 3D-FEM model was first made for a continuous steel multi-girders on which truck loading experiment was conducted, and validity of the model was checked compared with the measured stress data. Weight reduction effect of girders by re-designing using FEM influence line analysis was examined.

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道路橋における照明柱・標識柱の振動特性に関する基礎的研究

井舎英生, 北田俊行, 山口良弘, 徳増健

2004 年 11 巻 43 号 p. 147-158
発行日: 2004/09/24
公開日: 2010/06/28

DOIhttps://doi.org/10.11273/jssc1994.11.43_147

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Vibration due to traffic and wind causes almost all fatigue damage to portal marker columns and lighting poles on highway bridges. Development of technology, which can evaluate the possibility of the existence and occurrence of the fatigue damage efficiently, is necessary. The vibration characteristics decided by the locations and types of portal marker columns and lighting poles is investigated through modal frequency response analysis in this study. Various types of damage are generated in experimental models for portal marker columns, and a vibration experiment is carried out in this study. The relations between the extent of damage and vibration characteristics can be investigated through the vibration measurement and the analysis of a portal marker column.

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部材応力の長期計測による鋼橋モニタリングに関する基礎検討

高木伸也, 村越潤, 麓興一郎, 次村英毅

2004 年 11 巻 43 号 p. 159-169
発行日: 2004/09/24
公開日: 2010/06/28

DOIhttps://doi.org/10.11273/jssc1994.11.43_159

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Monitoring technologies for grasping the structural conditions of old and deteriorating bridges quantitatively are needed in order to support preventive and maintenance work of such bridges. Various monitoring researches have been done so far and several monitoring systems have already been put into practice mainly for long-span bridges. However, there have been few cases of long-term structural monitoring focusing on durability of bridges. It is important to research what kind of information long-term monitoring can offer us and how we should measure and use the data effectively for supporting maintenance work. This paper describes application of monitoring technologies to steel highway bridges, and analyzes the measured stress data obtained by 1-year-monitoring on an actual highway bridge.

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