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鋼構造論文集 Vol. 26 (2019), No. 104

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. 26 (2019), No. 104

鋼床版デッキ・Uリブ溶接部に生じるビード進展き裂の疲労寿命評価法に関する検討

井口 進, 内田 大介, 齊藤 史朗, 杉山 裕樹, 田畑 晶子

pp. 104_1-104_16

抄録

Fatigue cracks which initiated from the root of welded joints between deck plate and U-rib and propagated toward the surface of the weld bead (bead-through cracks) have been reported in Orthotropic Steel decks, but the fatigue strength evaluation method is not established. In this study, field investigations and FE-analysis were conducted for the bridge which bead-through cracks were found. And crack initiation point of bead-through crack was confirmed to be the same position as deck-through crack (initiates from the root of the weld and propagates through the thickness of the deck plate). In addition, fatigue damage of bead-through cracks was calculated using reference strain which proposed for deck-through crack.

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鋼床版デッキ・Uリブ溶接部に生じるビード進展き裂の疲労寿命評価法に関する検討

ダンパー取付部材の破断によって生じる地震時最大応答逆転現象の小型模型振動台実験による検証

辻 聖晃, 小川 勇大, 藤田 皓平

pp. 104_17-104_24

抄録

Shaking table tests of small scale building model with oil damper are performed in order to verify an earthquake response magnification phenomenon caused by fracture of damper attachment member during earthquake motion. Fracture of damper attachment member is simulated by means of detachable steel block which links a oil damper with a floor plate. The steel block is detached from the floor plate at any timing by switching on an electro magnet. It is shown that the characteristics of earthquake response magnification ratios which are observed in the shaking table tests correspond well to those which are simulated by numerical analysis.

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ダンパー取付部材の破断によって生じる地震時最大応答逆転現象の小型模型振動台実験による検証

ダイアフラムがコンクリート部分充填鋼管の地震時挙動に及ぼす影響

善財 聖也, 清水 茂, 近広 雄希, 大上 俊之

pp. 104_25-104_36

抄録

The present paper is aimed to study the behaviour of a partially concrete-filled steel tube (PCFST) under the seismic load. The PCFSTs are used as bridge piers due to the superior strength and ductility. In Japan, the diaphragm of the PCFST must be installed just above the concrete to fix the concrete and transmit the load to the concrete. However, the effect of the diaphragm on the tube behaviour is not clear. Therefore, we conducted the analysis of the PCFST subjected to the seismic load to discuss the effect of the diaphragm on the tube behaviour. Obtained results indicated the failure pattern of the PCFST was influenced by the presence or absence of the diaphragm. On the other hands, the opening size of the diaphragm give very small effect on the tube behaviour.

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ダイアフラムがコンクリート部分充填鋼管の地震時挙動に及ぼす影響

著しい腐食の生じたリベット桁端部の圧縮載荷試験

石川 貫人, 村越 潤, 野上 邦栄, 岸 祐介, 小峰 翔一, 細見 直史

pp. 104_37-104_49

抄録

Corrosion of girder ends is one of the major damage for reducing the load carrying capacity of steel bridges. This research aims on proposing a practical method for evaluating remaining capacity of steel riveted girder end with section loss due to severe corrosion. Compressive loading test and elasto-plastic finite element analysis using two models were conducted for a girder end specimen which was cut out from a demolished old steel bridge in order to investigate the influence of the section loss on the remaining capacity and failure behavior.

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著しい腐食の生じたリベット桁端部の圧縮載荷試験

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