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

Kou kouzou rombunshuu Vol. 17 (2010), No. 66

  • Relationship between weld layer configuration of NBFW and its strength & toughness

    pp. 66_1-66_10

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    DOI:10.11273/jssc.17.66_1

    “NBFW” is the welding method which is able to prevent the brittle fracture in the welded connections of diaphragms and “BCP325T” (high toughness cold press—formed RHS). In order to achieve the proper qualities in the connections, it is important that “NBFW” is applied under the strictly controlled welding conditions, such as configuration of topmost weld-layers, which cause difficulties in the productivity of its fabrication. In this research, various welding conditions of NBFW have been studied. The studied conditions were found to maintain equivalent quality to the conventional ones and enable higher productivity.
  • Study on the Static Characteristics of Web Connected Part of WBFW type Beam-End Connection

    pp. 66_11-66_22

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    DOI:10.11273/jssc.17.66_11

    In this paper, the static characteristics of WBFW (web bolted flange welded) type beam-end connection and the bending strength at the web connected part of this type connection were investigated by FEM Analysis. Parameters are the disposition of high strength bolts at the web connected part and the depth-to-thickness ratio of SHS column. Analytical results show that the bending strength at the web connected part becomes bigger by the decrease of the depth-to-thickness ratio of SHS column and the increase of number of high strength bolts at the web connected part. The disposition of high strength bolts at the web connected part and the depth-to-thickness ratio of SHS column give large influences on to the static behavior of the bolted joint at the web connected part.
  • Experimental study on the mechanical behavior of high strength bolted friction type joints with extremely thick plates and many bolts in a line

    pp. 66_23-66_33

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    DOI:10.11273/jssc.17.66_23

    Resent years, from the viewpoint of rational fabrication of the steel bridges, there are some examples to adopt extremely thick plates more than 75mm for primary members. In case of joints with such thick plates by using high strength bolted friction type joints, the number of bolts in a line along the member axis might be more than 10. However, the mechanical behavior of such multiple joints is not clear. In this study, the experiment for the joints with extremely thick plates and many bolts in a line has been carried out. And discussed herein is the mechanical behavior of such joints based on the experimental results.
  • Experimental Study on Vibration Control of Pole Type Steel Structures on Bridges by Using Wire Ropes

    pp. 66_35-66_44

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    DOI:10.11273/jssc.17.66_35

    Recently, it becomes a large problem that bridge vibration induced by vehicles causes damages to not only the bridge but also a pole type steel structures, such as lighting poles, marker poles on the elevated bridge. Since such damage tends to cause more severe damage, the vibration problem should be solved. As a number of such poles is large enough, it is important to improve damping performance of the steel pole with cheap cast. Then the authors suggested a vibration controlling technique for a steel pole by using wire ropes. It was found through the vibration experiment that the technique functions effectively and the vibrations of the pole can be reduced.
  • Method for Fatigue Life on the Facilities of Gate and Penstock

    pp. 66_45-66_50

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    DOI:10.11273/jssc.17.66_45

    Petrikat's chart indicates relationship between vibration amplitude and frequency. On the other hand, fatigue designing codes show relationship between stress range and repeat count of stress. However, relationship between fatigue designing codes and Petrikat's chart has not been clarified yet.
    In this paper, the evaluation method for safety on the facilities of gate and penstock is presented by applying the theory of beam-column and cylinder to relationship between stress and amplitude of vibration.

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