Kou kouzou rombunshuu
Online ISSN : 1884-0329
Print ISSN : 1880-9928
ISSN-L : 1880-9928
Volume 17 , Issue 67
Showing 1-5 articles out of 5 articles from the selected issue
  • Yasuhisa UDA, Toshiharu NAKADA, Kouichi KURATA, Toshiaki MAKIHATA
    2010 Volume 17 Issue 67 Pages 67_1-67_11
    Published: 2010
    Released: January 11, 2012
    JOURNALS FREE ACCESS
    In this paper, the new approaches to reliability assessment on the weir-gate facilities are shown as a substitute for maintenance operation with gate opening/closing. One is inspection of the hoist by means of slack wire rope operation, and the other is axial relative displacement measurement of the main roller bearing. The measuring results show that relative displacement of the main roller bearing arises from temperature difference between water and gate. The former happens on a long time, and the latter is caused by between day and night.
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  • Yoshihiko TAKADA, Akiko TABATA, Kimihisa USUI, Kunihiko MOTOI
    2010 Volume 17 Issue 67 Pages 67_13-67_27
    Published: 2010
    Released: January 11, 2012
    JOURNALS FREE ACCESS
    This report describes the stiffness of the asphalt pavement, considering the temperature effect and stress of orthotropic steel deck. The vehicles loading test is carried out for orthotropic steel deck both in summer and in winter, and we investigate the stiffness of the asphalt pavement by considering the relation between stress and temperature. Moreover, while computing the equivalent stress in every hour from the stress frequency measurement result, the equivalent axle load in every hour was computed using the live-load measurement result by BWIM. This method enabled it to analyze the evaluation of the stiffness of the asphalt pavement which was not able to be performed at elevated temperature by field measurement tests.
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  • Masayo YOKOO, Koji OGAWA
    2010 Volume 17 Issue 67 Pages 67_29-67_41
    Published: 2010
    Released: January 11, 2012
    JOURNALS FREE ACCESS
    In this study, we investigate the effect of restoring force characteristic of column bases on seismic responses in each story of steel frames. Dynamic analyses are carried out on column bases with a kinematics-hardening-type restoring force characteristic or a slip-type restoring force characteristic. The results indicated that, on the first story, the maximum story drift angle of slip-type is larger than that of the kinematics-hardening-type while, on the second story, they are similar. And on any story above the third, the kinematics-hardening-type is larger than the slip-type. In addition the predicitons of the maximum story drift angle of the first story are proposed in the case of the column bases having each restoring force characteristic with energy balance principal.
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  • Yoshihiro SAKINO, You-Chul KIM
    2010 Volume 17 Issue 67 Pages 67_43-67_52
    Published: 2010
    Released: January 11, 2012
    JOURNALS FREE ACCESS
    For brittle fractures in welding connections, it is important to pay attention to toughness decrease in weld heat affected zone (HAZ). In this paper, relationship between Charpy absorbed energy of simulated HAZs of “low toughness steel” and welded conditions were investigated. As the results, welding heat input did not affect the absorbed energy of simulated CGHAZ, but the absorbed energy became very large by decrease in maximum temperature in case of single-run welding. And heat welded conditions, by that Charpy absorbed energy became large in the CGHAZ in case of multi-layer welding, were investigated.
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  • Yoshinori SAKAI, Koji OGAWA
    2010 Volume 17 Issue 67 Pages 67_53-67_64
    Published: 2010
    Released: January 11, 2012
    JOURNALS FREE ACCESS
    This research is concerned with the pertinent column-to-beam strength ratio of 3D multi-storied steel moment frames. Analyses were carried out by using bidirectional ground motions transformed into the direction of strong and weak axes. The maximum value of the maximum story drift angle of the frames, which is subjected to bidirectional ground motions in arbitrary directions, is represented by the angle, which is subjected to one directional ground motion along the direction where the strength of the frame is the maximum. Based on the reasons reported above and the result of a previous study on 2D frames, the pertinent column-to-beam strength ratio of 3D steel frames can be expressed by a function of the input energy level.
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