Kou kouzou rombunshuu
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ONLINE ISSN: 1884-0329
PRINT ISSN: 1880-9928

Kou kouzou rombunshuu Vol. 17 (2010), No. 67

  • New Approach for Reliability Assessment on Weir-Gate Facilities

    pp. 67_1-67_11

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    DOI:10.11273/jssc.17.67_1

    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.
  • ANALYSIS OF STRESS CHANGE FOR THE TEMPERATURE EFFECT OF ORTHOTROPIC STEEL DECK

    pp. 67_13-67_27

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    DOI:10.11273/jssc.17.67_13

    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.
  • Effect of Restoring Force Characteristic of Column Bases on the Maximum Story Drift Angles of Each Story of Steel Frames

    pp. 67_29-67_41

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    DOI:10.11273/jssc.17.67_29

    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.
  • Effect of Welded Condition on Charpy Absorbed Energy of Heat Affected Zones in Low Toughness Steel

    pp. 67_43-67_52

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    DOI:10.11273/jssc.17.67_43

    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.
  • PERTINENT COLUMN-TO-BEAM STRENGTH RATIO OF STEEL FRAMES SUBJECTD TO HORIZONTAL BIDIRECTIONAL GROUND MOTIONS

    pp. 67_53-67_64

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    DOI:10.11273/jssc.17.67_53

    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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