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鋼構造論文集 Vol. 25 (2018), No. 97

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. 25 (2018), No. 97

柱の支持条件を考慮した摩擦ダンパーを組込んだ鋼骨組の動的挙動

楊 東, 山成 實

pp. 97_1-97_12

DOI:

10.11273/jssc.25.97_1

抄録

This research is concerned with vibration control system with passive friction dampers equipped at the bottom of a steel frame. Sliding of friction dampers give the frame the base-isolation effect. There is a problem of a large residual displacement of the building after a strong earthquake. In order to make the residual displacement conservative, the outer columns in the first story of the frame are directly connected to the foundation. Therefore, the base of the frame with friction dampers could get back to the original position by the spring back-force. Eventually, the system solves the problem of the residual displacement after an earthquake. In this paper, dynamic behavior of this base-isolation system is examined with four types of frame.

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柱の支持条件を考慮した摩擦ダンパーを組込んだ鋼骨組の動的挙動

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桁の温度伸縮に対するベローズ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. 97_13-97_23

DOI:

10.11273/jssc.25.97_13

抄録

Fatigue damage of bellows damper due to girder deformation caused by temperature change is examined. The bellows damper is connected between girders and abutments to reduce damage of superstructures and substructures. A design method to develop the compact and high-performance seismic dampers was proposed by the authors in which the bellows dampers are permitted to be subjected local inelastic cyclic strains due to temperature expansion and contraction of girders. In this paper, low-cycle fatigue properties of the bellows designed by the proposed design method are investigated based on P/V difference method as one of cycle-counting methods through fatigue analysis and low-cycle fatigue tests of the bellows. Fatigue strength of the bellows is examined using the equation of Manson-Coffin and the Miner's cumulative damage law. In addition, the validity of the proposed damage evaluation method for low-cycle fatigue of the bellows dampers is verified by variable amplitude loading fatigue tests of the bellows.

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桁の温度伸縮に対するベローズダンパーの疲労損傷評価

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塑性崩壊した鉄骨骨組の補修後耐震挙動に関する部分骨組実験と補修法の解析的検討

牛米 歩, 伊藤 拓海, 森 健士郎, 荒木 慶一

pp. 97_25-97_37

DOI:

10.11273/jssc.25.97_25

抄録

There are many discussions about repairability for damaged building. In previous study, it is reported that strength and rigidity of steel members are improved after repair. However, it is worried that the predominate failure mode of repaired frame is changed. In this study, the repairability of damaged steel subassemblage are investigated experimentally. From the test results, it is confirmed that the predominate failure mode of repaired frame is changed, but it may make the performance deterioration. Furthermore, a finite element analysis is conducted to clarify effectiveness of repair method expansion plan. From these results, it is capable of making the same failure mode as the original.

mendeley

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塑性崩壊した鉄骨骨組の補修後耐震挙動に関する部分骨組実験と補修法の解析的検討

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摩擦機構内蔵型耐力壁を適用した薄板軽量形鋼造建築物の構造特性係数に関する検討

脇田 健裕, 曽田 五月也

pp. 97_39-97_46

DOI:

10.11273/jssc.25.97_39

抄録

Steel framed houses consist of wall and floor panels made of structural boards and light-gauge cold-formed steel frames that are fastened with drilling screws. We had already made clear that the conventional shear walls show poor ductility and low damping ability and we developed a new type of shear wall with a few built-in friction-type dampers. Through the static loading tests results, we confirmed that this wall exhibits high energy absorbing capacity as well as high ductility. In this study, we first give general information on conventional and newly developed shear walls. Then, an analytical study to evaluate ductility reduction factor of the buildings designed using this wall will be conducted by Incremental Dynamic Analysis (IDA). Finally, we confirm that this wall has higher effects on suppressing seismic response compared with conventional shear walls.

mendeley

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摩擦機構内蔵型耐力壁を適用した薄板軽量形鋼造建築物の構造特性係数に関する検討

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H形断面梁の横座屈挙動に対するコンクリート床スラブによる拘束効果

聲高 裕治, 伊賀 はるな, 伊山 潤, 長谷川 隆

pp. 97_47-97_59

DOI:

10.11273/jssc.25.97_47

抄録

For examining lateral-torsional buckling behavior of H-shaped steel beam with concrete floor slab，numerical model with springs，which are considered with restraint effect by slab，on the beam upper flange is often used. This paper describes the restraint effect by slab on the beam，e.g.，torsional stiffness，lateral stiffness，maximum strength，and so on. First，loading test with slab-beam subassemblies was conducted to confirm the effects of some kinds of parameters on the stiffness and strength at the connection between beam upper flange and concrete slab. Second，prediction results by past researches and test results are compared，and in a part，new methods are proposed to enhance accuracy of prediction results.

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H形断面梁の横座屈挙動に対するコンクリート床スラブによる拘束効果

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溶接止端部に生じる局部ひずみ範囲の簡易推定法

清水 優, 舘石 和雄, 判治 剛, 本田 直也

pp. 97_61-97_66

DOI:

10.11273/jssc.25.97_61

抄録

Welded joints in steel structures are subjected to high strain amplitude during earthquake, which could cause a low cycle fatigue crack. To assess low cycle fatigue strength of welded joints, an estimation method based on local strain range at a crack initiation point has been established. In this method, an FE model with extremely-fine mesh is needed to obtain the local strain range accurately. In this paper, a prediction method of the local strain range from a model with relatively coarse mesh was proposed. Strain ranges obtained from coarse-mesh models were related to the local strain ranges from fine-mesh models. A prediction formula of the local strain range which is applicable to T-shaped joints, cruciform joints and out-of-plane gusset joints was established.

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溶接止端部に生じる局部ひずみ範囲の簡易推定法

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