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鋼構造論文集 Vol. 17 (2010), No. 68

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. 17 (2010), No. 68

繰返し載荷を受ける冷間成形円形鋼管柱の塑性変形性能

安井 信行

pp. 68_1-68_12

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This paper presents a numerical study on the cumulative plastic deformation capacity determined by local buckling of cold-formed circular tubular beam-columns subjected cyclic loading. The parameters are diameter-thickness ratio, axial force ratio, and slenderness ratio, the main amplitude of rotation angle which is expected to be occurred to the strong earthquake motion is 0.03rad. The equations that can evaluate the cumulative plastic deformation capacity are proposed, these equations are compared with the results of experiments.

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繰返し載荷を受ける冷間成形円形鋼管柱の塑性変形性能

T継手の塑性崩壊と初期ボルト軸力

西脇 威夫

pp. 68_13-68_22

抄録

Initial bolt forces have relationship with collapse modes through t-stub flange thickness showing that the lines of tcriijmn defined in reference[2] except a mode, in which faying surfaces are separated, are having a common point. β(the ratio of an initial bolt force to yield bolt force) being the abscissa of the point and t(flange thickness) is determined by the stub dimensions except flange thickness. The collapse modes indicated by β and t are divided into four regions, in which each collapse characteristic is distinguishable.

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T継手の塑性崩壊と初期ボルト軸力

既存鉄骨造露出柱脚アンカーボルトの耐震補強に関する研究

松尾 彰, 澤田 樹一郎, 加藤 巨邦, 藤谷 義信, 高松 隆夫, 玉井 宏章

pp. 68_23-68_28

抄録

In the preceding researches authors have proposed the seismic upgrading method of an anchor-bolt in an exposed-type column base in the existing old steel buildings and the tension test of the upgraded anchor-bolt showed enough upgrading effect. In this paper an experimental test of exposed-type column base using such upgraded anchor-bolts is performed and upgrading effect is recognized, and it is shown that the exposed-type column bases using such upgraded anchor-bolts could satisfy the rotation capacity demanded in the structural design.

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既存鉄骨造露出柱脚アンカーボルトの耐震補強に関する研究

PCaカーテンウォールファスナーの制振ダンパー化に関する研究

安井 信行, 吉岡 智和, 九谷 和秀, 白川 敏夫, 河野 昭彦

pp. 68_29-68_44

抄録

This paper proposes two types of dampers using fasteners of PCa curtain walls in order to reduce seismic response and damage of steel structures. Two types of dampers proposed here are friction damper and flexural yielding damper, dynamic and static cyclic loading tests were performed to investigate the hysteretic performance of dampers. Both friction damper which constructed the steel plate fastener, curtain walls, and concrete plate, and flexural yielding damper using rolled H-shaped steel showed stable behavior until cumulative slip or plastic deformation exceeded 2000mm.

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PCaカーテンウォールファスナーの制振ダンパー化に関する研究

高力ボルト支圧接合の荷重伝達機構および限界強度に関する解析的研究

亀井 義典, 谷口 侑也

pp. 68_45-68_54

抄録

In the current design method, high strength bolts is widely used as how to join components. The provisions of bearing connection joints high strength bolts is specified in the present design standard, but those are similar to the rivet connection. They are not conditions that bolt touches bolt hole, therefore it is necessary to clear those dynamics movement and limit state. This paper shows load transmission mechanism and limit strength of the bearing connection for high strength bolts, with the elasto-plastic finite displacement analysis for high strength bolted joints, and what various parameters affect is investigated.

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高力ボルト支圧接合の荷重伝達機構および限界強度に関する解析的研究

地震時に曲げを受ける溶接部の延性き裂発生に与える溶接部形状の影響と止端仕上げによる抑制効果

田村 洋, 佐々木 栄一, 金 成東, 山田 均, 勝地 弘

pp. 68_55-68_68

抄録

The welded joints of steel structure often accompany the high strain concentration and stress multiaxiality. Especially in the case of welded joints which subjected to bending during earthquakes, there is a possibility that a ductile crack occurs in the toe and the crack becomes the trigger of brittle fracture. In this study, the weld shape effect on ductile crack initiation and the control effect which produced by toe grinding were investigated through the cyclic loading tests of cross joint specimen and nonlinear FEM analyses on the specimen. As a result of loading test, the weld shape effect on ductile crack initiation at toe was confirmed. From the analytical investigation, the influence of the toe radius, the bead shape, and the base metal wastage accompanied with toe grinding were revealed. In particular, it was shown that the toe radius strongly affects on the risk of ductile cracking and toe grinding is effective to control the risk.

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地震時に曲げを受ける溶接部の延性き裂発生に与える溶接部形状の影響と止端仕上げによる抑制効果

建築柱エレクトロスラグ溶接部HAZ靭性の鋼材化学成分による定式化

児島 明彦, 吉田 譲, 橋場 裕治, 塩飽 豊明, 福田 多一郎, 崎山 哲雄, 中込 忠男, 森田 耕次

pp. 68_69-68_83

抄録

In order to estimate heat-affected zone (HAZ) toughness of electroslag welds of building box columns, formulas consisting of steel chemical compositions have been proposed. The connection between inner-diaphragm steel and skin-plate steel have been studied by electroslag welding tests and simulated HAZ tests. The Charpy absorbed energy (vE0: average value at 0 degree C) for the skin-plate HAZ, 1mm from the weld fusion line, can be simply estimated by the formulas using the chemical compositions (mass %) of the skin-plate steel.

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建築柱エレクトロスラグ溶接部HAZ靭性の鋼材化学成分による定式化

柱梁部分骨組架構モデルのエレクトロスラグ溶接部の破壊性状に関する研究

宋 勇勲, 石井 匠, 下川 弘海, 鈴木 孝彦, 萱森 陽一, 原田 幸博, 森田 耕次

pp. 68_85-68_100

抄録

This study describes fracture strength of electro-slag welded (ESW) connections in beam-to-welded box column connection. The discussions are based on subassemblage connection test results of ESW joints and finite element analysis (FEA) results of corresponding analytical models. Case studies are also carried out making the gap between an interior diaphragm and a beam flange main analytical parametes. Results are summarized as follows; 1) The subassemblage connection test results show roughly positive correlation between the fracture toughness and the fracture strengths of ESW joints. 2) The subassemblage connection test results and the corresponding FEA results correlate the fracture toughness with calculated equivalent maximum principal stress. 3) The fracture behavior of ESW joints shows good correlation between subassemblage connection test and cruciform model test.

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柱梁部分骨組架構モデルのエレクトロスラグ溶接部の破壊性状に関する研究

鋼構造柱梁接合部の塑性変形能力比較のための実験的研究

山崎 雅弘, 聲高 裕治, 松尾 真太朗

pp. 68_101-68_111

抄録

This paper discusses the effect of connection details on plastic deformation capacity of steel beam-to-column connections. The subjects are beam end connection with either through-diaphragms, exterior-diaphragms or knee brace dampers. It is clarified from the experimental results that connections with exterior-diaphragms and knee brace dampers have two or three times plastic deformation capacity of connections with through-diaphragms, whose capacity have been improved more by many researches than before the Kobe earthquake.

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鋼構造柱梁接合部の塑性変形能力比較のための実験的研究

建設需要を反映した新規鋼材規格寸法表の作成情報抽出手法

荒木 慶一, 李 有震, 五十子 幸樹, 上谷 宏二

pp. 68_113-68_119

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We propose a method for obtaining quantitative information for preparing new steel section lists that reflect recent variations in construction demands. To quantify new demands for steel section sizes, we solve a series of design optimization problems, wherein new construction demands, e.g., demands for longer spans, are reflected as the distributions of design conditions. Applying a statistical approach to the distributions of the optimal solutions, we obtain the quantitative information on the section sizes to be selected in new steel section lists. Through an example problem of hospital buildings, we demonstrate the change of the distributions of the optimal solutions with respect to the variations in span lengths. We also demonstrate that sections with thinner flanges are often selected than those in the current section list.

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