著者
牧野 稔 松井 千秋 三谷 勲
出版者
一般社団法人 日本建築学会
雑誌
日本建築学会論文報告集 (ISSN:03871185)
巻号頁・発行日
vol.281, pp.71-80, 1979
被引用文献数
4 1

In order to clarify post local buckling behavior and plastic rotation capacity of steel beam-columns, cantilever steel beam-columns of H shape cross section were tested under constant vertical load and alternating horizontal load. The test program was composed of two series; fifty nine specimens of Series I tested at large amplitude of plastic deflection, and thirty three specimens of Series II tested at small plastic amplitude. Main parameters involved in the tests were the width-to-thickness ratios of the flange b/f (2b, f : width and thickness of a flange, respetively), ones of the web D/w (D : depth of a cross section, w : thickness of a web), axial load ratios n (P/P_y, P : a constant vertical load of a specimen, P_y : axial yield load of a specimen), and material pro perties of the steel (mild steel and high strength steel). Values of the parameters b/f, D/w, n are as follows : b/f=6〜16 D/w=17〜65 n=0, 0.3, 0.6 In this paper, the test program and test results are reported. Some observation from the test results are as follows : 1) Not only width-to-thickness ratio of the flange but also one of the web and axial load ratio influence on the post local buckling behavior of the steel beam-columns. 2) Not only with axial load but also without axial load, the members subjected to alternating bending shrink due to unbalance of axial load carrying capacities of the buckled flanges.
著者
長澤 勲 手越 義昭 牧野 稔
出版者
一般社団法人情報処理学会
雑誌
情報処理学会論文誌 (ISSN:18827764)
巻号頁・発行日
vol.30, no.8, pp.1058-1067, 1989-08-15
被引用文献数
14

近年建築設計の分野では パーソナルコンピュータ上に実現されたCADシステムが普及し 設計作業の合理化に貢献している.しかし これらのCADシステムは 建築設計の幾っかの側面である設計図書の編集 構造計算 積算等の作業を個別的に支援しているのが現状であり 次のような問題点がある建築設計では 設計が完了した後で発注者の要求や施工上の問題点を解決するために頻繁に再設計が行われる.設計条件が変化した場合の再設計は 従来から行われている手作業と 個別作業の支援のシステムを併用する方法では 図面の変更や構造計算の基礎データを設計者自身が修正しなければならず十分な効果を上げることが因難である.本研究では 設計の個別的な支援による問題点を解決するため 次の特徴をもつCADシステムを開発した.(1)建築物の設計情報を一元的に表現した建築物モデルを中心として 意匠設計 構造設計 積算などの設計作業を支援するモジュールを醒置した・このことによって設計者は 設計データの変換にわずらわされることなく一貫して設計作業を進めることができる.(2)建築物モデルの一貫性を管理する建築物モデル管理機構を設け システムの保守を容易にした.(3)段計者が行う標準的な設計作業の流れを想定し これを一貫して支援できるように配慮した.実際の設計例に適用した結果 従来の方法に比べて設計期間を約1/20に短縮できた.
著者
牧野 稔
出版者
日本建築学会
雑誌
日本建築学会構造系論文集 (ISSN:13404202)
巻号頁・発行日
vol.59, no.458, pp.21-27, 1994
被引用文献数
1 2

Annual extreme winds due to typhoons for 40 years from 1950 are investigated at 28 weather stations in the western Japan which belong to a typhoon-prone region. The predictions for the return period of 500 years are larger about 10%, in average, than those based on usual annual maximum wind speeds owing to the randamness of typhoons. Three subsets of 20 year records from 40 years are also investigated. In most cases the last subset underestimates excessively. It may be caused by the alteration from 3-cup anemometers to propeller ones.
著者
牧野 稔
出版者
日本建築学会
雑誌
日本建築学会構造系論文集 (ISSN:13404202)
巻号頁・発行日
vol.62, no.492, pp.21-28, 1997
参考文献数
8
被引用文献数
2

The product of parameters in the Gumbel distribution, which is frequently applied to annual largest wind speeds, is employed to analyze the wind climate of the Japanese Isles. Three annual largest values caused by typhoons, winter to spring storms and their mixed events are investigated at 40 weather stations. The products obtained from winter to spring storm winds correspond to the values over well behaved wind climate countries such as the British Isles. The trend of typhoon activity is depicted on a probability paper by the probability distributions of typhoon winds and winter to spring storms. The combined use of probability distributions evaluated for typhoon winds and non-typhoon winds is recommended to set up design wind speeds in Japan.
著者
牧野 稔 渡壁 守正
出版者
一般社団法人日本建築学会
雑誌
日本建築学会論文報告集 (ISSN:03871185)
巻号頁・発行日
no.338, pp.10-18, 1984-04-30
被引用文献数
1

The objective of this paper is to investigate the statistical properties of the extreme value distribution of the annual maximum wind speed obtained by a probabilistic model. The probabilistic model modified from the previous one by considering a gaussian distribution of translating speed of typhoons and a gradient wind field yields the extreme value distribution of the annual maximum wind speed very well. The analysis based on this model leads to the following; (1) For the distribution of extreme winds caused by tropical cyclones such as typhoons, the Type III extreme value distribution with three parameters is preferable to the other Types. (2) The upper limit ω and the scale parameter k in the Type III distribution may be fixed as a constant in and near the Japanese Islands (ω=90m/s, k=6). (3) The location parameter u in the Type III distribution may be approximately obtained in eq. (14) as a function of the mean occurrence rate, λ, of typhoons. (4) Resulting that the Type III distribution is the most suitable for the estimation of wind speeds in typhoonprone regions, the control band based on the distribution involved almost all observed distributions acceptably at 8 sites for the period of 30 years.