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鋼構造論文集 Vol. 26 (2019), No. 103

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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キーワードランキング

21 Nov. (Last 30 Days)

鋼構造論文集 Vol. 26 (2019), No. 103

半幅員施工下における既設合成桁床版取替え時の主桁補強量の低減手法と合成作用に関する基礎的研究

小林 駿祐, 松本 崇志, 光川 直宏, 山口 隆司

pp. 103_1-103_14

DOI:

10.11273/jssc.26.103_1

抄録

Deteriorated RC slab deck of steel girder bridge is necessary to replace under half - width service construction for short time in Japan. Therefore it tends to replace composite RC deck to non-composite Precast PC deck, however, reinforcement of the main girders is required. In this study, frame analysis is conducted to confirm and to suggest a method to reduce reinforcement for girder. In addition, FEM analysis is conducted to evaluate the composite action between deck and girder. As a result of frame analysis, the amount of girder’s reinforcement could be reduced by taking cross-beam before combine the Precast PC deck in transverse direction. As a result of FEM analysis, the main girder with the Precast PC deck showed the incomplete composite action.

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半幅員施工下における既設合成桁床版取替え時の主桁補強量の低減手法と合成作用に関する基礎的研究

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Ris

軸方向圧縮力を受ける鋼製円筒に対する周方向CFRPの補強効果

ファン ヴィエット ニュット, 松本 幸大, 松井 孝洋, 中村 一史

pp. 103_15-103_29

DOI:

10.11273/jssc.26.103_15

抄録

Recently, the security and integrity of large thin-walled steel cylinders (TSCs) have been threatened by an increasing number of high-magnitude earthquakes. To develop a sustainable economy and infrastructure, existing tanks must be strengthened. In this study, we investigate the strengthening effects of circumferential CFRP layers on the increasing load-carrying capacities of TSCs under compressive load through finite element analysis (FEA) and experiments. The results show that circumferential CFRP layers, particularly high-strength CFRP sheets, can increase the load-carrying capacity of TSCs. In addition, numerical results are found to correspond well with experimental results.

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軸方向圧縮力を受ける鋼製円筒に対する周方向CFRPの補強効果

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Ris

活荷重に対するベローズ型ダンパーの疲労損傷評価

頭井 洋, 田中 賢太郎, 松村 政秀, 佐合 大, 姫野 岳彦

pp. 103_31-103_43

DOI:

10.11273/jssc.26.103_31

抄録

Seismic bellows dampers, which are connected between girder and abutment, are subjected to girder bending rotations due to live load. Since their occurrence frequencies are very high even though stresses due to live load are small, high-cycle fatigue properties of dampers must be examined. Fatigue properties of bellows dampers are evaluated based on high cycle fatigue tests and finite-element analyses (FEA). Firstly, bending rotation angles of girder end parts are calculated using fatigue-load (F-load), which is used for fatigue evaluation of road bridge design. Using the obtained rotation angles, stresses of bellows dampers are calculated by three-dimensional FEA models. Fatigue strength of bellows dampers is examined by high-cycle fatigue tests of bellows damper specimens. Fatigue strength of bellows dampers for live load is evaluated by test results and calculation results based on fatigue design of road bridge specification.

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活荷重に対するベローズ型ダンパーの疲労損傷評価

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Ris

曲げ加工された鋼板を用いた免震構造用履歴型ダンパーの復元カモデルおよび地震応答性状

畑中 祐紀, 玉村 典士, 桑原 進, 戸張 涼太

pp. 103_45-103_54

DOI:

10.11273/jssc.26.103_45

抄録

In this study, a hysteresis model of hysteresis dampers using bent steel plates for base-isolated structu res （BSPD） is proposed. The BSPD comprise four bent steel plates bent into a trapezoid. The bent steel plates are connected together in the shape of a cross. Since the mechanical behavior of the BSPD depends on the shape of the bent steel plates, the influence of the shape on the seismic response characteristics of base-isolated structures is investigated.

mendeley

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曲げ加工された鋼板を用いた免震構造用履歴型ダンパーの復元カモデルおよび地震応答性状

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