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鋼構造論文集 Vol. 22 (2015), No. 86

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. 22 (2015), No. 86

当て板接着された突合せ鋼板のはく離強度の評価

清水 優, 石川 敏之, 堀井 久一, 服部 篤史, 河野 広隆

pp. 86_1-86_11

抄録

Recently, bonding patch plate is used for rehabilitation of steel structures deteriorated with corrosion or fatigue cracks. The patch plate tends to decreases the stress intensity factor at crack tip and delay the crack propagation. However, debonding of patch plates could occur around the end of patch plates and at fatigue crack edges. To evaluate debonding of patch plates bonded to the cracked steel plate, axial loading tests for butted steel joint with bonded patch plates were conducted. Furthermore, the shear and normal stresses in adhesive layer were analyzed. The debonding strength of the joint was evaluated from a view of principal stress in adhesive layer.

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当て板接着された突合せ鋼板のはく離強度の評価

梁の横補剛に関する各種設計規定の比較

金尾 伊織, 戸来 孝徳, 于 征

pp. 86_13-86_21

抄録

In this paper, various design codes for lateral bracings are compared about beam strength, plastic deformation capacity, out-of-plane deformation and stiffening force. Maximum beam strength showed full plastic moment and the strength was maintained until beam end rotation angle 0.045 rad. Plastic deformation capacity R showed three or more. Out-of-plane deformation was almost within 150mm. However, stiffening force was large in long beam. In design code, required stiffening force is 2 to 3% of compression force of flange, but maximum stiffening force was 9%.

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梁の横補剛に関する各種設計規定の比較

ノックオフ型サイドブロックを併設した免震高架橋の地震時挙動

中西 泰之, 松村 政秀, 山口 隆司

pp. 86_23-86_32

抄録

The knock-off type steel side block, proposed by the authors, provides a displacement restraint against a small earthquake but has some technical problems to be solved for a wider application of it. In this study, an improved design equation on breaking load of the side block is proposed by referring to its failure mechanism. Also dynamic behavior of isolation bearings having the side block are grasped through shaking table test and seismic responses of viaduct with the bearings having the side blocks in the transverse direction of the bridge axis are investigated through seismic response analyses.

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ノックオフ型サイドブロックを併設した免震高架橋の地震時挙動

集中横荷重を受ける中空鋼管およびコンクリート充填鋼管のたわみ挙動に及ぼす加力部形状の影響に関する解析的研究

マハムド コリ エフェンディ, 河口 弘光, 南 幸翔, 河野 昭彦

pp. 86_33-86_45

抄録

Tsunami flotsam attacked many steel buildings in the 2011 off the Pacific coast of Tohoku Earthquake. Steel buildings construct popularly by using tubular columns. One of the difficulties to evaluate the strength of steel tubular member against the collision of Tsunami flotsam is local deformation caused by the collision, which degrades the overall strength. Furthermore, contact surface shape of collision object, for example, sharp or flat introduces variation of local deformation and the corresponding strength reduction. The filling concrete into tubular members (CFT) would be alternative to overcome the disadvantages. Therefore, we performed static FEM analysis by using the program MSC Marc. The collision by Tsunami flotsam categorizes as the low velocity collision, so that the static analysis may be applicable to investigate the above topics. We discuss that the overall strength degradation by local deformation and the effect of loading tip shapes for vacant steel tubular members and CFT members.

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集中横荷重を受ける中空鋼管およびコンクリート充填鋼管のたわみ挙動に及ぼす加力部形状の影響に関する解析的研究

鋼管ねじりダンパーを利用した格子型制振壁システムにおける安定履歴のための限界径厚比に関する解析的検討

鈴木 琢也, 山﨑 賢二

pp. 86_47-86_55

抄録

In this paper, a new type damping wall system using torsional steel tube damper is proposed. This proposed system has a feature that we can set the stiffness and yielding strength freely. And we can set any opening for doors or windows where designers want. For the proposed system has stable hysteretic energy absorption, it is important that steel tube damper shows stable hysteresis. But it is known that with large radios-thickness ratio, steel tube damper has small energy absorption ability. So, in this paper, the critical radios-thickness ratio of torsional steel tube damper for large energy absorption is confirmed by FE analysis.

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鋼管ねじりダンパーを利用した格子型制振壁システムにおける安定履歴のための限界径厚比に関する解析的検討

フィレットを有する面内ガセット溶接継手の応力集中係数に関する解析検討

清川 昇悟, 木下 幸治, 内田 大介

pp. 86_57-86_66

抄録

Stress concentration factor of in-plane welded gusset joints with circular transitions is examined analytically. The focus is on the influence of the geometry, which is defined by parameters such as the flange width D, the transition radius r and the gusset plate length L. Parameter study results show that the effect of D and r are significant, but the effects become less and less with increasing D. Based on the results, a stress concentration factor equation is proposed for covering larger D. The proposed equation has better agreement with FEM results compared to the conventional equation, when D becomes large.

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フィレットを有する面内ガセット溶接継手の応力集中係数に関する解析検討

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