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鋼構造論文集 Vol. 14 (2007), No. 53

ISIJ International
belloff
オンライン版ISSN: 1884-0329
冊子版ISSN: 1880-9928
発行機関: Japanese Society of Steel Construction

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鋼構造論文集 Vol. 14 (2007), No. 53

熱プレストレス工法の連続合成桁への適用に関する実験的研究

沼田 克, 栗田 章光, 中井 博

pp. 1-10

DOI:

10.11273/jssc1994.14.1

抄録

At an intermediate support of continuous composite girder bridge, the compressive stress is generally introduced into the concrete-slab to improve the durability of bridge. The mainstream of introducing the compressive stress is jack-up-and-down method or PC-bar method. These methods can improve the serviceability limit state but cannot improve the ultimate limit state of bridge. The authors have studied thermal prestressing method to improve the durability of bridges. In this paper, firstly, the experiment of introducing compressive stress into two-span continuous steel girder model and two-span continuous composite girder model is predicated. Secondly, the stress variation in long-term behaviors is presented and the effect of the thermal prestressing method is discussed based on these experimental studies.

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熱プレストレス工法の連続合成桁への適用に関する実験的研究

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ゴム鋼併用型耐震緩衝装置の荷重―変位関係の更新と動的荷重への適応性

皆川 勝, 後藤 学, 吉田 郁政

pp. 11-21

DOI:

10.11273/jssc1994.14.11

抄録

In this study, the authors conducted weight dropping impact tests of shock absorbers composed of rubber and steel pipes with various loading speed in order to investigate the rate dependency accurately. The experimental results showed that the dynamic effect on the load- displacement relationships of the absorbers are mainly caused by rate dependent characteristics of rubber material. By using the results, we proposed a method to evaluate dynamic load-displacement relationships by means of static load-displacement characteristics and confirmed the validity of the method through comparison with experimental results.

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ゴム鋼併用型耐震緩衝装置の荷重―変位関係の更新と動的荷重への適応性

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鋼構造骨組における柱梁耐力比及び柱梁剛性比の調査検討

川島 敏夫, 小川 厚治

pp. 23-32

DOI:

10.11273/jssc1994.14.23

抄録

This paper describes about column-to-beam strength ratio and stiffness ratio of existent steel moment frames. Eighteen analytical frames for seismic response analysis as well as twelve existent frames are prepared with applying the current Japanese criterion on seismic resistance. Numerical simulations on column-to-beam strength ratio and stiffness ratio are carried out for these frames. As the result, it was clarified that most of the strength ratio and the stiffness ratio are higher than 2.0. The analytical results are higher enough than the required value of both the strength ratio and the stiffness ratio, those are regulated in order to restrain damage concentration on observed story.

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鋼構造骨組における柱梁耐力比及び柱梁剛性比の調査検討

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冷却時間と化学成分を考慮したYGW18を用いる場合の溶接金属の強度評価式

西田 祐三, 田渕 基嗣, 田中 剛, 倉持 貢, 中野 利彦

pp. 33-48

DOI:

10.11273/jssc1994.14.33

抄録

It is well known that the strength of weld metal depends on cooling time and chemical composition (Ceq) of weld metal. This paper presents empirical formulae predicted strength of the weld metal using weld wire YGW18 specified in JIS Z 3312. Tensile tests of weld metal with plate thickness (16, 25, 32mm), heat input(15, 25, 35kJicm) and interpass temperature (150, 250, 350, 450) are carried out. These test results are put together with the results of the past tests, and the empirical formulae for the strength of the weld metal using YGW18 are derived by the same manner which is successful in case of weld wire YGW11. The formulae predict the strength of the test results with about the same accuracy in case of YGW11.

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冷却時間と化学成分を考慮したYGW18を用いる場合の溶接金属の強度評価式

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鋼と充填コンクリートの剥離を考慮した鋼製橋脚柱の地震応答解析

渡邊 哲也, 清水 茂

pp. 49-58

DOI:

10.11273/jssc1994.14.49

抄録

In this paper, a series of dynamic analyses is made on a partially concrete-filled steel box column, with considering the debond of the steel concrete interface. The numerical model of the column, in which the local buckling of the steel plate shall be preceded, is adopted in the analyses, because the out-of-plane deformation of the plate due to debond is considered to accelenate the local buckling of the plate. The analyses are made under two types of the seismic motions observed in the Chuetsu Earthquake in 2004; one is the main shock with the maximum ground motion of 1675.8 gal, and another one is the largest aftershock with 2035.6 gal. Debond is practiced by using the "interface elements" provided in the computer program package LUSAS. The results of the analysis indicate that larger displacement is arisen by the main shock rather than the aftershock although the aftershock has the larger ground acceleration.

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鋼と充填コンクリートの剥離を考慮した鋼製橋脚柱の地震応答解析

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自己診断機能を有するTRIP鋼の材料特性とその応用

金子 佳生, 桐越 一紀, 大西 宏治, 鈴木 隆生, 宮本 則幸, 羅 黄順

pp. 59-65

DOI:

10.11273/jssc1994.14.59

抄録

The objective of this paper is to examine experimentally an applicability of health monitoring system employing TRIP(TRansformation Induced Plasticity)steels. The application of TRIP steels to assess structural performance degradation was evaluated by material tests. The magnetic characteristics of TRIP steels under tensile and compressive uniaxial loading were examined with the measurement of induced voltage. The stress-strain hysteresis and the associated magnetic alternation of TRIP steels were identified. Further more, plate-bending tests were carried out for both TRIP steels and stainless steels. The dual function of TRIP steels, serving as both a high ductility load-carrying member and a sensor to monitor damage accumulation, was confirmed.

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自己診断機能を有するTRIP鋼の材料特性とその応用

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二重鋼管合成短柱の圧縮特性に関する実験的研究

上中 宏二郎, 鬼頭 宏明, 園田 恵一郎

pp. 67-75

DOI:

10.11273/jssc1994.14.67

抄録

Concrete filled double steel tubular columns (CFDT in abbreviation) consist of two centric steel tubes and filled concrete between them. By the arrangement of inner tube, the own weight can be reduced in comparison with ordinary concrete filled steel tubular members. Centric loading tests on twelve specimens of CFDT were carried out. Observed failure mode was local buckling of both tubes associated with shearing failure of concrete. Axial strength of CFDT were agreement with or larger than accumulative equation consisting of two steel tubes and filled concrete. However, the larger inner-to-outer diameter's ratios, yield the smaller axial lnadinu canacities. Moreover. empirical equation of axial strength of CFDT was proposed.

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二重鋼管合成短柱の圧縮特性に関する実験的研究

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