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鋼構造論文集 Vol. 20 (2013), No. 79

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. 20 (2013), No. 79

鋼道路橋の受熱温度推定指標に関する研究

石尾 真理, 玉越 隆史, 横井 芳輝

pp. 79_1-79_10

DOI:

10.11273/jssc.20.79_1

抄録

Many examples of the bridge damaged due to accidental or incendiary fire heating up the steel bridge from below have been reported. When steel girder bridges are exposed to fire, it is important to estimate the temperature of each member. The surface temperature of steel member can be estimated by the damaged coat. Therefore, the gas and electric furnaces, the authors tested the various heating coat. Creating a sample of damaged coating in order to estimate the surface temperature, we have established a method for evaluation. In addition, we have applied to the removed bridges with the evaluation method.

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鋼道路橋の受熱温度推定指標に関する研究

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梁端部破断を考慮したブレース付ラーメン骨組のエネルギー吸収性能

松井 良太, 廣山 剛士, 竹内 徹

pp. 79_11-79_18

DOI:

10.11273/jssc.20.79_11

抄録

When braced moment frames are subjected to a strong ground motion, the bracing elements are likely to fracture. Such fracture results in a large cumulative plastic deformation at the beam end which leads to the connection failure. The authors have proposed a method to assess the brace and beam end fracture using time history response analysis without micro element FEM. However, this method does not take the beam end joint efficiency into account. In this study, the effect of the joint efficiency on the cumulative deformation capacity of the beam end is investigated. Using those results, the seismic performance of the braced moment frame is analyzed including the fracture of brace members and beam ends.

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梁端部破断を考慮したブレース付ラーメン骨組のエネルギー吸収性能

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皿型高力ボルトを用いた摩擦接合継手のボルト形状及び継手特性に関する解析的検討

田畑 晶子, 金治 英貞, 黒野 佳秀, 山口 隆司

pp. 79_19-79_28

DOI:

10.11273/jssc.20.79_19

抄録

The authors focused on the high strength bolted friction grip joints with countersunk head bolts which can finish the surface of the connection plate flat smoothly and prevent from functional depression due to corrosion. In this study, we carried out FE analysis varying the angle of countersunk head in order to evaluate the contact pressure of double shear connected friction joints with countersunk heads. Also, we have investigated the influence on load transferring mechanism by using countersunk head bolt for frictional joints. It has concluded that the most desirable angle of the countersunk head is 90 degrees. CD series's slip strength is about only 4% lower than that with normal head bolts.

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皿型高力ボルトを用いた摩擦接合継手のボルト形状及び継手特性に関する解析的検討

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高力ボルトの遅れ破壊に影響を及ぼす侵入水素量の確率論的評価

松岡 和巳, 宇野 暢芳, 秋山 英二, 萩原 行人, 松山 晋作, 原田 宏明

pp. 79_29-79_40

DOI:

10.11273/jssc.20.79_29

抄録

The local concentration of hydrogen absorbed from the environment in the section of high strength steels, where the hydrostatic stress is the highest under loading and where the initiation of delayed fracture takes place, was investigated stochastically. For the investigation, the results of statistical analysis of critical hydrogen concentration for delayed fracture obtained by using conventional strain rate tests and the ratio of fracture of exposed high strength bolts were used. The probability distribution of the local hydrogen was successfully evaluated and the correspondent environmental pH was estimated. The pH value simulating the maximum hydrogen entry caused by atmospheric corrosion in Okinawa was slightly lower than 2.

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高力ボルトの遅れ破壊に影響を及ぼす侵入水素量の確率論的評価

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補剛形式の異なる偏心補剛H形鋼圧縮部材の弾塑性座屈荷重に対する等価補剛剛性評価

吉野 裕貴, 木村 祥裕

pp. 79_41-79_51

DOI:

10.11273/jssc.20.79_41

抄録

Our previous papers have evaluated the effect of the eccentric braces to restrain the buckling deformation for H-shaped compression members with an eccentric brace at the center of the member, and with continuously eccentric braces, respectively. But the effect for the continuously eccentric braces may be different from that for an eccentric brace at the center of the compression member. In addition, the reduction ratio of the buckling stress with web deformationin inelastic range may be different from that in elastic range．If it makes the effect of each eccentric bracing equivalent, it is more practical to design the compression members with eccentric braces in the space structures.
This paper compares the elasto-plastic buckling behavior for H-shaped compression members with eccentric braces at the center of members to that with continuously eccentric braces, and estimates the equivalent of the bucking bracing stiffness for two kinds of eccentric bracing methods within critical slenderness ratio.

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補剛形式の異なる偏心補剛H形鋼圧縮部材の弾塑性座屈荷重に対する等価補剛剛性評価

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自己組織化特徴マップ（SOM）を用いたアーチ系橋梁の健全度診断に関する基礎的研究

池田 祥宜, 山口 隆司, 北原 武嗣, 杉浦 邦征, 森若 浩司

pp. 79_53-79_66

DOI:

10.11273/jssc.20.79_53

抄録

In this study, the vibration analysis for the existing arch bridge induced by a motion exciter is conducted in order to understand the vibration characteristics which could reflect structural soundness of the existing arch bridge, such as natural frequencies and response power spectrum. Based on these analytical results, Self-Organizing feature Map (SOM) is applied to evaluate the structural soundness and its applicability is discussed. It is analytically concluded that the proposed evaluation method has the potential to classify the damage of members in an existing bridge structures.

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自己組織化特徴マップ（SOM）を用いたアーチ系橋梁の健全度診断に関する基礎的研究

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応力ひずみ関係に基づくステンレス鋼圧縮板の終局強度評価法

宮嵜 靖大, 奈良 敬

pp. 79_67-79_79

DOI:

10.11273/jssc.20.79_67

抄録

This paper proposes a method for predicting precisely ultimate strength and displacement of stainless steel plates under uniaxial compression. Based on stress-strain diagrams of stainless steels obtained by coupon tests, the method consists of two classified parts. At the first part, the ultimate strength is estimated by plate slenderness and proposed constants of each stainless steel in the region of elastic buckling. In the region of apparent difference of the stress-strain diagrams between stainless steel and mild steel, the ultimate strength is calculated by predicted ultimate displacement and stress-strain diagrams. The proposed method is independent of proof stress which is 0.1% or 0.2%, because of a proposed conversion factor.

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応力ひずみ関係に基づくステンレス鋼圧縮板の終局強度評価法

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H-SA700Bを用いた柱梁溶接部の変形能力に及ぼす梁端ディテールの影響

崎野 良比呂, 川端 洋介, 中込 忠男

pp. 79_81-79_90

DOI:

10.11273/jssc.20.79_81

抄録

The purpose of this study is to clarity the influence of beam-end details on the fracture and deformation capacity of beam-to-column connections made of H-SA700B high-strength steel. This paper presents the results of full-scale tests of site-welded beam-to-column connections with four types of the beam-end details: straight, cutout type horizontal haunch, weld type horizontal haunch and drilled flange. Based on the test results, both of the two types of horizontal haunch beam-to-column connections can avoid brittle fracture and have larger deformation capacity compare to the straight beam-to-column connection. However, the drilled flange beam-to-column connection cannot avoid brittle fracture.

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H-SA700Bを用いた柱梁溶接部の変形能力に及ぼす梁端ディテールの影響

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鋼構造建築物における耐震設計と耐津波設計の関係

尾崎 文宣, 半谷 公司, 菅野 良一, 辻井 正人

pp. 79_91-79_104

DOI:

10.11273/jssc.20.79_91

抄録

After the Pacific coast of Tohoku Earthquake in 2011, a provisional tsunami resistant design has been established for tsunami evacuation buildings. They are required to possess both seismic and tsunami resistant performance, to secure human lives from earthquake and tsunami disaster. In the present paper, relationships between the seismic and tsunami resistant designs for steel building frames are minutely investigated by simple plastic calculations using story-aggregation frame models. From observation of the parametric calculations, it has been clarified that the tsunami resistant performance is closely related to the seismi resistant performance and seismic retrofits for existing inadequate buildings have significant effects to improve the tsunami resistant performance.

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鋼構造建築物における耐震設計と耐津波設計の関係

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せん断抵抗型パネルダンパーの静的履歴特性に関する研究

萩野谷 学, 古川 忠稔, 神谷 隆, 田口 孝

pp. 79_105-79_114

DOI:

10.11273/jssc.20.79_105

抄録

The vibration control system is a construction method which controls the vibration of a building by using control system, in order to reduce damage of the building against external disturbance such as earthquake. When using panel damper, if it is completely fixed on structural frame, the axial force appears in the damper due to the damper deformation. Therefore, in this paper, the junction formation not to transfer axial force in panel damper proposed. The test is conducted for confirmation of performance of the proposed junction formation. As a result of the test, the difference in the width thickness ratio of the panel damper and junction form is clarified about the influence to give yield strength and deformation.

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せん断抵抗型パネルダンパーの静的履歴特性に関する研究

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引張・圧縮軸力を受ける鋼棒ダンパーの履歴特性に関する実験的研究

萩野谷 学, 古川 忠稔, 神谷 隆, 田口 孝

pp. 79_115-79_122

DOI:

10.11273/jssc.20.79_115

抄録

Smart and intelligent buildings with seismic control devices for reducing the earthquake responses and damages were recently practically applied for many projects. The authors have been proposed the new hysteresis damper of the buckling-restrained brace with steel bar. This paper has been confirmed hysteretic performance by the test of proposed damper. And the results of the tests showed excellent deformation capacity under the both tension and compression loading.

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引張・圧縮軸力を受ける鋼棒ダンパーの履歴特性に関する実験的研究

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柱にSTKR材を用いた既存不適格鋼構造骨組の補強設計法（鋼板とPC鋼棒による補強）

聲高 裕治, 長谷川 隆

pp. 79_123-79_133

DOI:

10.11273/jssc.20.79_123

抄録

In 2007, the building standard law of Japan was revised and a specification of column overdesign factor (COF) was added in case of square tube columns. Our researches deal with existing non-conformed steel buildings using STKR columns according to being not satisfied with the specification of COF. In this paper, reinforcement with steel plates, which is welded to column face and fastened by PC bars through floor slab, is proposed. An experimental verification of reinforced columns was conducted to confirm the validity of reinforcement design method. As a result, specifications for providing required bending strength and sufficient plastic deformation capacity to STKR columns were clarified.

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柱にSTKR材を用いた既存不適格鋼構造骨組の補強設計法（鋼板とPC鋼棒による補強）

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