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Kou kouzou rombunshuu Vol. 27 (2020), No. 106

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. 27 (2020), No. 106

EVALUATION METHOD FOR RESIDUAL AXIAL FORCE OF CORRODED HIGH-STRENGTH BOLTS BASED ON THICKNESS REDUCTION

Masayuki TAI, Yoshitomo NAGAMINE, Akira TSURUTA, Tetsuhiro SHIMOZATO

pp. 106_1-106_10

DOI:

10.11273/jssc.27.106_1

Abstract

This paper investigates the reduction of axial force in corroded high-strength bolts. FEA revealed that the root mean squared value of the thickness reduction was a useful parameter for evaluating the residual axial force for the corroded bolts. Furthermore, the effect of corroded bolt shape on the residual axial force was examined by using FE models based on 3D scanning result. To improve the accuracy of residual axial force measurement, the correction formula which consider the thickness reduction of bolt head on the axial force measurement was proposed. The proposed evaluation method indicated that the residual axial force can be estimate with the accuracy of ±15%.

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EVALUATION METHOD FOR RESIDUAL AXIAL FORCE OF CORRODED HIGH-STRENGTH BOLTS BASED ON THICKNESS REDUCTION

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Ris

MECHANICAL PROPERTIES OF CARBON STEEL UNDER HIGH TEMPERATURE AND PARTIAL FACTOR FOR FIRE RESISTANT DESIGN OF STEEL GIRDER BRIDGES

Yusuke TAKAHASHI, Tomonori MURAKAWA, Yusuke IMAGAWA, Osamu OHYAMA

pp. 106_11-106_22

DOI:

10.11273/jssc.27.106_11

Abstract

This paper is intended to summarize findings from tensile test of carbon steel during fire and numerical analysis of partial factors for fire resistant design of steel girder bridge as a parameter reliability index. The specimens were rolled steels for welded structures. As parameters for evaluating, we have employed steel type and fire temperature. The numerical analysis of partial factors based on classical reliability theory. In conclusion, we confirmed that the decreasing inclination of steel strength is almost same as Eurocode. Furthermore, we calculated resistance coefficient based on tensile test under high temperature.

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MECHANICAL PROPERTIES OF CARBON STEEL UNDER HIGH TEMPERATURE AND PARTIAL FACTOR FOR FIRE RESISTANT DESIGN OF STEEL GIRDER BRIDGES

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A STUDY ON APPLICABILITY OF HORIZONTAL STIFFENER FOR BUFFERING WEB WIDTH-THICKNESS RATIO OF HIGH-STRENGTH STEEL H-SHAPED BEAM

Tomoya KASUGA, Hirofumi KANEKO, Tadao NAKAGOMI, Kenji YAMAZAKI, Fumi USHIWATA

pp. 106_23-106_38

DOI:

10.11273/jssc.27.106_23

Abstract

The current design criteria on width to thickness ratio of high strength steel in Japan is too strict for use in practice. Research of the past revealed that evaluating the deformation capacity of H-shaped beam made of HT780 steel based on the angle at maximum strength of H-shaped beam made of 490 N/mm2 grade steel is an effective method to reduce weight of steel. The purpose of this paper is to reveal more efficient design method for H-shaped beam made of HT780 steel by using stiffener at neutral axis of web.

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A STUDY ON APPLICABILITY OF HORIZONTAL STIFFENER FOR BUFFERING WEB WIDTH-THICKNESS RATIO OF HIGH-STRENGTH STEEL H-SHAPED BEAM

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INFLUENCE OF THE SHAPE AND THE HARDNESS DISTRIBUTION NEAR THE WELD TOE TO STRAIN DISTRIBUTION AND LOW-CYCLE FATIGUE LIFE

Toshihiro UMEDA, Moe SANO, Seiichiro TSUTSUMI, Tomohiro KINOSHITA, Tetsuya TAGAWA

pp. 106_39-106_49

DOI:

10.11273/jssc.27.106_39

Abstract

This paper deals with low-cycle fatigue life of full-penetration weld joint. The objective is to clarify the influence of the shape and the hardness distribution near the weld toe on low-cycle fatigue life. Cyclic loading was applied to the two types of weld joints which had different shapes and hardness distributions near the weld toe. Low-cycle fatigue life of the weld joint with smooth shape and hard weld metal was superior because of late crack initiation. Digital image correlation (DIC) method also demonstrated that the difference of the hardness distribution caused the different strain distribution and it led to the difference of deformation capacity until crack initiation.

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INFLUENCE OF THE SHAPE AND THE HARDNESS DISTRIBUTION NEAR THE WELD TOE TO STRAIN DISTRIBUTION AND LOW-CYCLE FATIGUE LIFE

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ATMOSPHERIC EXPOSURE CHARACTERISTICS OF ZN-30MASS% AL THERMAL SPRAY UNDER CORROSION ENVIRONMENT USING THE ARTIFICIAL SEA WATER

Atsushi NAKANO, Wataru OSHIKAWA, Noboru YONEZAWA, Chihiro MORITA, Yoshihiro SHIRAI

pp. 106_51-106_60

DOI:

10.11273/jssc.27.106_51

Abstract

A nine-year atmospheric exposure test was performed on Zn-30mass%Al thermal spray coating under the corrosion environment using the artificial sea water. A similar corrosion test carried out to compare the properties with Hot-dip-Zinc coating. Atmospheric corrosion properties of thermal spray coating were evaluated by surface observation, X-ray diffraction, film thickness measurement and element analyses using EPMA. From these analysis results, the thickness of thermal spray coating was not impacted greatly under corrosion environment using the artificial sea water. In addition, corrosion resistance of Zn-30mass%Al thermal spray coating is much higher than that of Hot-dip-Zinc coating.

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ATMOSPHERIC EXPOSURE CHARACTERISTICS OF ZN-30MASS% AL THERMAL SPRAY UNDER CORROSION ENVIRONMENT USING THE ARTIFICIAL SEA WATER

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STUDY ON BENDING STRENGTH AND EVALUATION OF BOLT AXIAL FORCE FOR THE DOUBLE END PLATE CONNECTION WITH HORIZONTAL RIBS

Yuki MINEYAMA, Yuma SUGIMOTO, Takashi YAMAGUCHI

pp. 106_61-106_74

DOI:

10.11273/jssc.27.106_61

Abstract

In this study, for shortening erection period of temporary bridges, we propose to use the double end plate connection using high strength bolts at the connection of temporary bridges. The past experiment has confirmed that double end plate connection using high strength bolts can apply to bridge main girder connection. However, the design method is not clear. In this study, we have clarified the bending strength of this connection from the analytical results. Furthermore, in consideration of these results, a simplified calculation method of bolt axial force for this type connection proposed.

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STUDY ON BENDING STRENGTH AND EVALUATION OF BOLT AXIAL FORCE FOR THE DOUBLE END PLATE CONNECTION WITH HORIZONTAL RIBS

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LOW CYCLE FATIGUE CRACK PROPAGATION OF STEEL UNDER CONSTANT AMPLITUDE DISPLACEMENT HISTORIES

Arief Panjaitan, Kazuo TATEISHI, Masaru SHIMIZU, Takeshi HANJI

pp. 106_75-106_80

DOI:

10.11273/jssc.27.106_75

Abstract

Low cycle fatigue is a failure mode exhibiting a small number of loading repetitions to failure. Former work conducting research on constant displacement amplitude presented crack growth rate was related to cyclic J-integral range, but the data were limited. This research aimed to provide additional information to cover study done at the past so that a formula for obtaining crack growth rate can be precisely proposed. Research work was conducted with applying two different cyclic displacement means of loading histories to CT specimen. Cumulative plots in crack growth rate addressed to past and current research work were found enforcing formula used for obtaining crack growth rate under larger cyclic strains proposed at the past.

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LOW CYCLE FATIGUE CRACK PROPAGATION OF STEEL UNDER CONSTANT AMPLITUDE DISPLACEMENT HISTORIES

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