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Kou kouzou rombunshuu Vol. 25 (2018), No. 99

ISIJ International
belloff
ONLINE ISSN: 1884-0329
PRINT ISSN: 1880-9928
Publisher: Japanese Society of Steel Construction

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Kou kouzou rombunshuu Vol. 25 (2018), No. 99

LOAD TRANSMISSION OF HIGH-STRENGTH BOLTED PATCH PLATE WITH ADHESIVE JOINT AT THE ENDS

Takuya IKEDA, Toshiyuki ISHIKAWA, Hisakazu HORII

pp. 99_1-99_9

DOI:

10.11273/jssc.25.99_1

Abstract

In the repair method by high-strength bolted patch plate, the higher slip coefficient between patch plates and steel members is required. However, the quality control of roughness of surface on steel members is difficult on sites. In this study, a combination repair method of high-strength bolts and adhesive bonding is proposed. In order to clarify the effectiveness of proposed method, tensile tests were carried out. As the result of the tensile tests, it was found that the adhesive layer at the ends of patch plate can transfer the stress in main plate to patch plates. Additionally, it was clarified that the load transmission ratio of high-strength bolted joint and adhesive joint at the ends of patch plate.

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LOAD TRANSMISSION OF HIGH-STRENGTH BOLTED PATCH PLATE WITH ADHESIVE JOINT AT THE ENDS

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ESTIMATION OF FRACTURE STRENGTH OF WELDED JOINTS WITH WELD DEFECTS

Hiroumi SHIMOKAWA, Takaaki HIROSHIGE, Tetsuya FUJITA, Haruhito OKAMOTO, Yukihiro HARADA, Tadao NAKAGOMI

pp. 99_11-99_22

DOI:

10.11273/jssc.25.99_11

Abstract

If the relationship between the defect size and the fracture strength of welded joint is made clear, the permissible level of the defect size to secure the performance required by the design is grasped, and it is useful for the admission decision with the defects which is detected by the ultra sonic test. In this paper, the fracture strength of welded joints with weld defects is discussed. In order to grasp the permissible level of the defect size of welded joint, the investigation about the results of the previous studies was carried out and the construction of the estimated equation of the fracture strength by application of linear fracture mechanics was attempted. As the results of this study, the estimated equation was proposed.

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ESTIMATION OF FRACTURE STRENGTH OF WELDED JOINTS WITH WELD DEFECTS

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Application of laser welding on high-strength steel for buildings (H-SA700)

Yoshihiro SAKINO, Naoyuki MATSUMOTO, Koutaro INOSE, Tohru NOBUKI, Seiichiro TSUTSUMI

pp. 99_23-99_30

DOI:

10.11273/jssc.25.99_23

Abstract

Arc welding is commonly applied to high-strength steel for buildings (H-SA700). However, the heat-affected zones of H-SA700 often become soft and the yield stress decreases compared to that of the base metal owing to the large heat input of arc welding. In this study, laser welding was applied to H-SA700. The residual stress, hardness, mechanical property and fracture toughness of H-SA700 after laser welding were examined and the results were compared with those of arc welding. As a result, the softened area of H-SA700 welded using laser welding was considerably smaller than that obtained using arc welding, and the yield stress was the same as that of the base metal. Fracture pass deviation (FPD) was observed in the Charpy impact test.

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Application of laser welding on high-strength steel for buildings (H-SA700)

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EXPERIMENTAL STUDY ON REINFORCEMENT METHOD USING CFRP FOR BENDING LOAD BEARING CAPACITY OF DOUBLY SYMMETRIC STEEL PLATE GIRDER

Masafumi HATTORI, Takeshi HIROSE, Kazuo OHGAKI, Takeshi MIYASHITA, Yusuke OKUYAMA, Akira KOBAYASHI, Yuya HIDEKUMA

pp. 99_31-99_39

DOI:

10.11273/jssc.25.99_31

Abstract

In the RC slabs replacement of viaducts, the reinforcement of steel girders is necessary. The reinforcement of the bending load bearing capacity of the steel girder with the carbon fiber sheet is considered. We carried out four points of bending tests for the specimens which assumed parameters such as types of steel, width-thickness ratio of web, width and thickness ratio of compression flange, with or without horizontal stiffeners, and with or without reinforcement by CFRP sheets. This study revealed the improvement of load-carrying capacity of a steel girder under bending by the application of proposed reinforcement. Carbon fiber sheets were not peeled off from the steel girder until reaching its maximum load.

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EXPERIMENTAL STUDY ON REINFORCEMENT METHOD USING CFRP FOR BENDING LOAD BEARING CAPACITY OF DOUBLY SYMMETRIC STEEL PLATE GIRDER

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AN INVESTIGATION OF STRENGTHENING MECHANISM FOR SHEAR STRENGTH OF WEB PLATE BY CFRP

Masayuki TAI, Tetsuhiro SHIMOZATO, Go TAKAHASHI, Yasushi NAGASAKA

pp. 99_41-99_51

DOI:

10.11273/jssc.25.99_41

Abstract

In this study, the strengthening mechanism for the shear capacity of web plate by CFRP has been investigated. Loading tests were carried out with the several sheet bond direction as parameters. The mechanism was examined by the viewpoints of shear buckling strength and post-buckling strength. The carbon fiber sheet along the tensile axis of diagonal tension field can improve the post-buckling strength due to the retardation of yield occurrence at the tension field. On the other hand, both the shear buckling strength and the post-buckling strength increase by using the sheet along the compression axis, since the outof-plane deformation of web plate is prevented.

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AN INVESTIGATION OF STRENGTHENING MECHANISM FOR SHEAR STRENGTH OF WEB PLATE BY CFRP

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FATIGUE STRENGTH OF SINGLE SIDED TRANSVESE BUTT WELDED JOINTS WITH PENETRATION BEADS

Takanori MURAKAMI, Takeshi MORI, Takeshi WATATANI, Tadahisa TSUYAMA, Atsushi HAGIWARA, Yuusuke TAKEDA

pp. 99_53-99_65

DOI:

10.11273/jssc.25.99_53

Abstract

Fatigue strength category for transverse butt welded joints with full penetration welds from both sides is specified as D by the JSSC Fatigue Design Recommendations on the basis of a lot of fatigue test data. However, the fatigue test data do not exist so much as for transverse but welded joints with full penetration welds from one side. In this study, for the purpose of obtaining the fatigue strength of the one side welded joints, fatigue tests and stress analyses under axial forces and plate bending are carried out on four kinds of specimens welded by different welding methods.

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FATIGUE STRENGTH OF SINGLE SIDED TRANSVESE BUTT WELDED JOINTS WITH PENETRATION BEADS

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LOCAL BUCKLING BEHAVIOR AND STRENGTH EVALUATION OF CORRODED STEEL SHAPES

Kazumasa HISAZUMI, Ryoichi KANNO, Tomonori TOMINAGA

pp. 99_67-99_76

DOI:

10.11273/jssc.25.99_67

Abstract

In recent years, serious damages of aging steel structures and the related accidents have often been reported, it is imperative to assess the structural health conditions and take necessary measures to sustain the functions of the structures. In this paper, paying an attention to local buckling, the behavior and strength of corroded steel angle and channel stub columns were studied with FEM analyses using geometry information obtained directly from the corroded steel shapes. Through the detailed behavioral observations in the analyses, stress redistribution within the cross sections was identified even in corroded steel members after initiation of elastic local buckling. It was also pointed out that the ultimate strengths of the corroded steel stub columns were reasonably evaluated based on traditional effective width theory using mean thickness of each plate element.

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LOCAL BUCKLING BEHAVIOR AND STRENGTH EVALUATION OF CORRODED STEEL SHAPES

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