日本建築学会論文報告集
Online ISSN : 2433-0027
Print ISSN : 0387-1185
ISSN-L : 0387-1185
311 巻
選択された号の論文の23件中1~23を表示しています
  • 原稿種別: 表紙
    1982 年 311 巻 p. Cover1-
    発行日: 1982/01/30
    公開日: 2017/08/22
    ジャーナル フリー
  • 原稿種別: 表紙
    1982 年 311 巻 p. Cover2-
    発行日: 1982/01/30
    公開日: 2017/08/22
    ジャーナル フリー
  • 原稿種別: 目次
    1982 年 311 巻 p. Toc1-
    発行日: 1982/01/30
    公開日: 2017/08/22
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  • 原稿種別: 付録等
    1982 年 311 巻 p. App1-
    発行日: 1982/01/30
    公開日: 2017/08/22
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  • 平居 孝之
    原稿種別: 本文
    1982 年 311 巻 p. 1-10
    発行日: 1982/01/30
    公開日: 2017/08/22
    ジャーナル フリー
    Arbitrary shaped two dimensional elasticity problems are possible to be solved by superpositing some elementary solutions to satisfy the boundary conditions. As the electric computer advanced, the numerical process on satisfying the boundary conditions might be carried out with the required precision, and the solutions have the possibility to get the desirable accuracy. Recently not a few studies on the method for arbitrary shaped elasticity problems based on the principle of superposition were reported. In this paper the author tried to adopt some elementary solutions to go with the ones that have been reported already, and the usefulness of the method is examined by an original program. Arbitrary shaped two dimensional elasticity problems which boundary conditions are given by stresses or deformations, which is composed of several portions of different materials, and infinite elastic plate having arbitrary shaped hole under the action of an uniform load in the infinite distance are solved. On the numerical process to superpose the elementaly solutions, plural simultaneous equations are effective to reproduce the boundary conditions. The exactitude of the solution is increased by adopting several elementaly solutions in conbination with the boundary conditions. It is conjectured that the error becomes within 5 percent by the program presented except the corner of the problem. There still remains the insufficient exactitude of the solution in the corner of the problem, but the superposition of the elementary solutions is useful on arbitrary shaped two dimensional elasticity problems.
  • 前田 潤滋, 足立 一雄, 牧野 稔
    原稿種別: 本文
    1982 年 311 巻 p. 11-21
    発行日: 1982/01/30
    公開日: 2017/08/22
    ジャーナル フリー
    For several years authors have been trying to observe high winds for the studies on the response behaviors of line-like structures in high winds. Two high power transmission towers at Sendai and Matsushima in the west coast of Kyushu were selected as the observation towers. Ten or eight wind pressure transducers, which were used as anemometers with high frequency response properties and controlled against the mean wind direction and five propellor anemometers were set on towers. The data of moderately high velocities of winds caused by a typhoon and a winter storm satisfactorily recorded. In this papers the results of power spectra, auto-correlations, cross-correlations and normalized co-spectra estimated from these data are discussed and compared with the theoretical values based on the theory of isotropic turbulence. The resulting conclusions are as follows; 1. The estimated power spectra and auto-correlations agree well with the theoretical values. 2. The estimated cross-correlations and normalized co-spectra correspond to the theoretical values in the most parts expect the lower layers which have a steep gradient of the mean winds. 3. Thus the atmospheric turbulence of horizontal gustiness are considered to be fundamentally isotropic.
  • 脇山 広三, 平井 敬二
    原稿種別: 本文
    1982 年 311 巻 p. 22-29
    発行日: 1982/01/30
    公開日: 2017/08/22
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    Consideration of bending stress in bolt shank of tee connections is described herin. According to the results from the fatigue tests described in Part 1 and the static tests, the results of consideration about bending stress in bolt shank are followings. (1) When the initial clamping force is introduced into high strength bolt, already the bending moment (M_O) occurs in the bolt shank of tee connections. The average quantity of this moment is 1.27 ton・cm irrespective of the bolt length or the shape of tee connections, and in other words, the amount of the 18.8% of the average stress in bolt shank take place as the bending stress. (2) The bending moment in bolt shank VS. applied load relationship (M-F curve) is affected by the initial bending moment (M_O) and direction of M_O. And so, the shapes of M-F curve are classified into three types in elastic region of bolt shank. (3) Now, it is impossible that the bending moment of bolt shank to any applied load would be estimated by theory. So, according to the results from fatigue tests, the bending moment (M_u) of bolt shank at the upper load in fatigue tests is estimated. The average moment of M_u is 1.26 ton・cm and in other words, the amount of the 18.5% of the average stress in bolt shank occures as the bending stress. (4) The bending moment in bolt shank (⊿M) that results from the range of applied load would be very important to estimate the fatigue strength bolt in tee connections. So herin, the moment (⊿M) is estimated according to the fatigue tests. The fatigue strength of the high strength bolt in tee connections would be estimated by these quantity of bending moment in this paper.
  • 小森 清司
    原稿種別: 本文
    1982 年 311 巻 p. 30-41
    発行日: 1982/01/30
    公開日: 2017/08/22
    ジャーナル フリー
    周辺梁を有する鉄筋コンクリート二方向スラブの荷重〜たわみ特性を追跡することは, 現状では非常に困難なことであるとされている。そこで本報では, その現状を打破するため, かなり大胆な仮定は用いているが, 簡便な方法で変動面内圧縮力のアーチ効果やねじり効果を算入した鉄筋コンクリート正方形スラブの耐力とたわみを求める近似解法を開発し提案した。その結果, この算定法によって求めた値が, 実験結果との比較において明らかになったように, 耐力, たわみ共, 従来法によって求めた値よりかなり良い精度を有していることがわかった。採用した仮定がかなり大胆であることや, 実験的な裏づけが少ないことなど, まだ問題は今後に残されているが, このような分割と合成という方法によって, 周辺梁をもつ正方形スラブのW〜δ特性が, 最大荷重到達後の減力域まで追跡可能になったと思われる。
  • 今井 弘
    原稿種別: 本文
    1982 年 311 巻 p. 42-49
    発行日: 1982/01/30
    公開日: 2017/08/22
    ジャーナル フリー
    This report is concerned with the effects of an embedded beam on the elastic and plastic properties of framed reinforced concrete shear walls subjected to shear force. Two specimens of an identical proportion were used for the experiment, for one of which a steel beam was further embedded horizontally at the midheight location of the specimen. The effects of the embedded beam were discussed at the view-point of "Indirectly Measured Values", which were analyzed based on actually measured strains and forces, and the following results have been obtained. (1) Before cracking in the concrete wall panels, the wall panels are more or less under pure shear and the stresses of the embedded beam are negligibly small. So the existence of the embedded beam hardly influences on the behaviors of framed shear walls. (2) After cracking in the wall panels, as the embedded beam tends to prevent the peripheral frame from expansion, its tensile stress becomes fairly large. Because of these actions the shear stress distribution of column-frames with the embedded beam differs from that of the other specimen without the beam. (3) The stress-strain relationships of the peripheral steel frame acting as members of framed shear walls are evaluated as the elastic stiffnesses of the steel frame. (4) Hysteresis curves of diagonal wall members after cracking are such that under the compressive stress the curves are almost the same as that of σ-ε curve of concrete, and under tensile stress those are idealyzed into originoriented hysteresis characteristics with the tensile strength of concrete as a yielding point.
  • 中尾 正喜, 大島 一夫
    原稿種別: 本文
    1982 年 311 巻 p. 50-56
    発行日: 1982/01/30
    公開日: 2017/08/22
    ジャーナル フリー
    A new method of air temperature measurement is discussed. The air motion generates a wide band random signal by a spatial fixed one point sensor. The object is to measure the moving air temperature without natural noise i.e., high frequency irregularity. The basic principle of the measuring method is to observe the natural irregularity of moving air temperature through a spatial multi-point or spatially distributed sensor which forms a kind of spatial hi-cut filter. In this paper, the spatial filter effect has been theoretically analyzed with the concept of power spectral density function. A spatial filter based on this principle has been examined and applied to air temperature measurement. Experimental results show that the analysis is reasonable. This method is applicable to other measurements of a moving object in space.
  • 浦野 良美, 渡辺 俊行
    原稿種別: 本文
    1982 年 311 巻 p. 57-66
    発行日: 1982/01/30
    公開日: 2017/08/22
    ジャーナル フリー
    In the previous paper (Part 1), an approximate transfer functions model was proposed for the heat conduction system of a multi-layer wall. Based on this model, the system is rewritten by the state equation and the output equation as expressed in eqns. (3.9) and (3.10). The system equation is converted into the time discrete domain by using the trapezoid hold function Gh_j(s) and Z-transform. The multi-layer heat transfer problems can be calculated successively by the state transition equation (4.2.6) and either types of the output equation (4.3.4) or (4.4.4). And then, we have following advantages on the calculation process : (a) time interval T can be varied at any time, (b) memory size occupied by the state variables can be reduced to half comparing with single input-output systems, and (c) the radiant heat exchange between interior surfaces can be considered in case of need. It is necessary, however, to examine some precise errors caused by discreting continuous variables. They are shown in Figs. (5.3.1), (5.3.2) and (5.3.3). Futhermore, the heat conduction through an actual slab is measured together with the heat balance at its outside surface under natural changes of outdoor air temperature, solar radiation, atmospheric radiation and wind velocity. Using data obtained this field experiment, the variation of heat flow at the outside surface is calculated. In this calculation, the outside surface film conductance is regarded as a time variable parameter and time interval T is taken as 0.5(h). Close agreement between observed and calculated values is shown in Fig. (6.1).
  • 松浦 邦男, 古江 嘉弘, 翁長 博
    原稿種別: 本文
    1982 年 311 巻 p. 67-74
    発行日: 1982/01/30
    公開日: 2017/08/22
    ジャーナル フリー
    Details of the acoustic improvement of a large hall are described. Though the reverberation time of this hall was rather short for an orchestral music, it was not altered keeping in mind the multi-purpose use of the hall. Therefore only adding some early reflections was attempted for the acoustic improvement of this hall. In order to know where reflectors should be set up to get more early reflections, the following subjective tests were carried out in the hall using an anechoic chamber music tape as the source of test signals. The sound fields to be judged were produced by a loudspeaker in the center of the stage and one or two loudspeakers fed delayed signals for simulated early reflections. Paired comparison tests of the different sound fields were carried out. It was concluded from above subjective tests that median-plane as well as lateral reflection would contribute to the acoustic improvement of this hall. Based on above findings, the shape of the side walls was altered to get lateral reflections while movable over-stage reflectors were installed to get more early reflections. The acoustics of this hall had certainly improved, and which was confirmed by comparing dummy head recordings taken before and after the above improvement. Generally for the acoustic improvement of large halls it is necessary to increase both spatial-impression and loudness, therefore lateral and median-plane reflection would be useful. This was also supported by other experiments in anechoic chamber on the subjective effects of adding median-plane reflection.
  • 岡崎 甚幸, 伊藤 明宏
    原稿種別: 本文
    1982 年 311 巻 p. 75-81
    発行日: 1982/01/30
    公開日: 2017/08/22
    ジャーナル フリー
    This paper presents a method of assignment of rooms to locations and a method of addition of communication path and doorways. A grid is placed over a given site and each rooms, dividing them into cells of a size decide by architect. The first room to be positioned is located at the center of the site. The second is located contiguous to the first with the virtual path area between. A communication path between two rooms, both of which have the largest number of contacts, is assigned first in the virtual communication path area. As the communication path between two rooms is generated, a doorways of each room is located such that the path is the shortest. Unnecessary virtual path area between two rooms is eliminated by the convergent shift of rooms' positions.
  • 杉浦 進
    原稿種別: 本文
    1982 年 311 巻 p. 82-92
    発行日: 1982/01/30
    公開日: 2017/08/22
    ジャーナル フリー
    Dans le dessein du groupe ou de l'ensemble des logements, des valeurs elementaires du projet, par exemple, la superficie de logement, le raport de plancher-sol, le niveau, la proportion du plan de logement etc., sont souvent decidees avant de dessiner le plan. En tel cas, il est necessaire pour faire un projet rationnel que la relation entre une valeur elementaire et une faculte realisee par le plan ait ete conue. Ces recherches arretent leur attention sur l'espace d'alentour du logement qui constitue le confort a habiter avec l'espace interieur. L'article de la valeur elementaire qui concerne etroitement la faculte dont l'espace d'alentour du logement charge (on le denomme "l'indice de dessein") a ete cherche, apre fixer le "coefficient de la distance de batiment (L)" (texte p.86) et le "taux d'espace public (K)" (texte p.86) comme des indices de la faculte (on les denomme les "indices de faculte"). En consequence de ces recherches, nous avons etabli le "coefficient de l'espace de manteau (u)" (texte p.89) comme un indice de dessein, et verifie son efficacite par cent projets realises recement qui sont constitues par des types varies de l'ensemble des logements, du groupe de la maison individuelle au grand ensemble de logement collectif de haut niveau. La correlation entre "u", "L" et "K" est exprimee dans la Fig.5 (texte p.90). D'ailleurs, nous avons examine la relation entre "u" et le "temps au soleil" du logement (la Table 3, texte p.91) et la comparaison des valeurs de "u" de chaque type du groupe de logement (Fig.7, texte p.91). En definitive, conformement a eux, nous exposons que le coefficient de l'espace de manteau "u" est suffisamment utile comme un indice de dessein.
  • 栗原 嘉一郎, 冨江 伸治, 植松 貞夫, 門谷 眞一郎
    原稿種別: 本文
    1982 年 311 巻 p. 93-100
    発行日: 1982/01/30
    公開日: 2017/08/22
    ジャーナル フリー
    本論文では, 研究者の研究活動における雑誌利用について, 雑誌1タイトル当りの利用者数, 研究者一人当りの和洋別利用種数, ならびに研究者の研究領域と雑誌の主題部門との関係などを, 設定したA, B 2種類の利用形態とともに明らかにした。もとより, 本調査研究は調査対象を筑波大学の教官に限定しているため, 研究領域別にみた場合, 調査母数およびその中でのさらに細かい研究内容という点で, 部分的には片寄りがあるものと思われ, ここに示した結果が, ただちに充分な一般性をもっているとは言えない。しかし, 同種調査をさらに多数の大学等で実施するにしても全研究領域について片寄りなく調査対象者を選定することはかなり困難であること, 研究者の研究情報に大きな比重を占める雑誌の利用の状況について, 今迄その実態が限定つきにせよ明らかになっていないことから, 本論文に示した結果は, 雑誌利用の面からみた研究領域相互の近接性の傾向を知る上で有効であり, 従ってキャンパス内ならびに図書館内での学術雑誌の配置のあり方や, 雑誌の共同購入の可能性などについて考究するための一つの検討資料として利用することには有効であろうと考える。なお, 本論文の骨子は文-3, 文-4において既に発表している。本論文はそれらを一つにまとめたものであるが, その際, 人文社会系の研究領域を細分化しすぎていた点等の研究者の研究領域・雑誌主題部門のグルーピングの方法や, 表の表現方法等について再検討を行ない, 一部を変更し, それにともなう再集計を行なった上でまとめたものである。
  • 中野 明, 栗原 嘉一郎
    原稿種別: 本文
    1982 年 311 巻 p. 101-110
    発行日: 1982/01/30
    公開日: 2017/08/22
    ジャーナル フリー
    本論において筆者は, 規模の異なる2つの総合病院について物品系物流の総体を提示するとともに, 病院の部門構成を供給部門と使用部門とに仮説的に設定することにより, これを性質を異にした二つの主要物流の集合として大きく分けて考え得ることを示した。このことは, 物流計画を病院計画の根幹にすえて病院建築のブロック構成を考え直す可能性を探ろうとする立場において意味を持つ作業であったと考える。筆者としては続報以下において, この考え方の上に, まず各物流の原単位的把握をおこない, 次いで物品の管理・供給システム, 病院の清汚管理の面とも関連させつつ, 物流計画の観点からみた病院建築の構成のあり方について論考を進めたいと考えている。なお情報系搬送に対しては, 病院情報処理のE.D.P.S.化の度合に応じて搬送される情報系物品は著しく減少することになるため, 物流計画にとっては病院情報システムを如何に設定するかが問題となる。この点に関しては別の考究が必要なので, 情報系物流の実態の提示をも含めて機会を改めることとする。
  • 桂 久男, 青木 恭介
    原稿種別: 本文
    1982 年 311 巻 p. 111-118
    発行日: 1982/01/30
    公開日: 2017/08/22
    ジャーナル フリー
    以上から, 児童の公園利用の遊び生活について次の点が指摘できる。公園量の少ない地区においては, 公園量が少ないことによって自宅内の遊び場の重要性が高く, 児童各自の身近な空間条件によって利用率は異なるあらわれ方を示す。遊びを展開する場を身近に持たない(遊べる庭の無い, 子供部屋の無い)児童の利用率が, 遊びを展開する場を身近に持つ児童の利用率より高くなる。また, 公園利用の遊び生活の原点と考えられる公園利用欲求については, 地区全体の公園量が少ないことから, 願望的に欲求率が高くなっており, この場合, 公園で遊びたいという欲求が容易に満足されない状況といえる。一方, 公園量の多い地区では, 公園量が多いことによって自宅内の遊び場の重要性は相対的に低く, 児童各自の身近な空間条件によって利用率が大きく異なることはない。むしろ, 各因子によらず, 全体として, 児童密度の低い地区で高い利用率となり, 児童密度の高い地区で低い利用率となっている。また, 公園利用欲求は, 利用率に極めて近い値としてあらわれており, 公園量が多いことにより, 利用欲求が利用行為に結びつき易く, 欲求が満足されている状況にあることが指摘できる。これを, 児童密度の高い地区についてまとめる。公園量の多い地区と, 公園量が少ない地区とを比較すると, 公園量の多い地区では, 利用欲求自体が低い値となっており, 利用率はその欲求をうけて全体に低い値となっている。これに対し, 公園量の少ない地区では, 利用欲求は高く, 行動力が比較的あると考えられる高年齢層の男児や, 遊びを展開する場を身近に持たず, 自宅外に遊び場を求めざるを得ない児童の利用率は高くなってはいるが, 行動力が比較的小さいと考えられる女児及び低年齢層の男児や, 遊びを展開する場を身近に持ち, 自宅外に遊び場を求めなくとも遊び場を確保しうる児童においては利用率が低いなど, 児童密度の高い地区での公園利用の遊び生活が, 高密であることによる影響をうけて低い利用率となっていると考えられる傾向が, それぞれの地区ごとにあらわれていることが指摘される。以上のことが, 今回の調査研究において指摘されることであるが, このことは次のような研究課題を提起する。(1)高密度居住地においては, 路地・空地などが減少していると思われ, 高密度地区における戸外遊びの場は, 低密度地区に比較して, 空間量自体が少なく, その中で公園の占める割合は高くなり, 公園の利用率も高くなると思われるものが, 逆に低い利用率となっており, 特に, 公園量の多い地区で, 遊びを展開する場を身近に持たない児童の欲求率, 利用率が低いことから, その児童の遊び生活と遊び場がどのように考えられるのか, また用意しうるのかを明らかにすること。(2)高密度居住地においては, 遊び生活の形態(交友関係・遊び場の選択など)自体が, 公園利用欲求に結びつかない条件を持っているのか否かを地区の空間条件との関連で明らかにすること。以上をもって, 本報告のまとめとするが, 本報告は, 仙台市内の4地区における事例的性格を持つことをまぬがれない。本報告での傾向的特色の指摘は, 今後の研究課題を明らかにすると共に, 数多くの地区における検証を行なうことによって明確なものとなるものであり, 次報以降, ここに指摘した今後の研究課題について, 更に研究をすすめるものである。
  • 石田 頼房, 波多野 憲男
    原稿種別: 本文
    1982 年 311 巻 p. 119-128
    発行日: 1982/01/30
    公開日: 2017/08/22
    ジャーナル フリー
    本論文では, 郊外地区画整理事業地区の宅地の市街化過程に見られる市街化の遅延と無秩序化の現象を「おくれ」及び「ずれ」という用語で定式化し, 我々の調査を含む多くの調査結果を基礎に概念の明確化と, その内容, 要因の整理を行い, あわせて対策の方向を検討した。結果を簡単にまとめれば次の様である。(ア)「おくれ」は区画整理事業が市街化に先行して行なわれるという物質と, 事業そのものは市街化の促進対策を持たないことからおこり, 事業が市街化に先行する度合の強いグループに顕著に見られる。(イ)「おくれ」には「全面おくれ」「地区的おくれ」および「混在的おくれ」の3つの型が存在する。「おくれ」の対策は, この型ごとに違ったものになるが, 計画的対処の容易な「地区的おくれ」へ導く事が要点である。(ウ)「ずれ」は区画整理事業の範囲が原則として基盤整備にとどまるという特質に由来する。(エ)「ずれ」には, 住区居住環境に影響する側面と, 街区居住環境に影響する側面とがあり, この2つは計画的対処の上では区別して考えなければならない。(オ)「ずれ」の要因は, 現実と乖離した計画標準を個々の区画整理設計で採用することなど, 計画段階で既に予見されているものが少なくない。これも, つまるところ街区レベルの市街化形態を計画的規制できないことに由来する。(カ)「おくれ」が「ずれ」の要因になること, 「おくれ」が「ずれ」の住区居住環境への影響を弱めるなど, 両者の相互関係に留意する必要がある。
  • 関川 千尋
    原稿種別: 本文
    1982 年 311 巻 p. 129-136
    発行日: 1982/01/30
    公開日: 2017/08/22
    ジャーナル フリー
    The housing policy after the war has been pursuing mainly how many houses have been supplied, not taking it into account whether one could afford to pay his house rent or to pay for his house, which has rather been neglected completely therfore the research for that field with little data to go upon has not been done properly. In this study report, we use the income and rent data of Housing Survey of Japan 1958-1978 though they are not perfect material, and we try to figure out income elasticity for house rent payment; so that we want to show you how much common people of our country have participated after the war into activities to better housing circumstances. The results of this study are as follow : 1. Consumer's preference toward a rented house has been going down since the high time of 1968. 2. In 1978 they tended to use in general for a rented house inferior goods and it made for the first time the elasticity below zero. 3. Looking at it by a kind of a house, the worse qualities houses i.e. wooden houses, worn-out old houses, and so on privately owned rented houses, both exclusive and joint use of facilities they are in advanced stage of inferior goods. 4. On the whole, people prefer to own their houses in accordance with improvement of economic and social surroundings.
  • 保野 健治郎, 高井 広行, 難波 義郎
    原稿種別: 本文
    1982 年 311 巻 p. 137-144
    発行日: 1982/01/30
    公開日: 2017/08/22
    ジャーナル フリー
    In this paper, we consider of a basic theory of some former fire spread formulas of houses. These formulas are almost analyzed by useing the data of conflagration which were really outbreaked fires, or some real experiments. We suggest the new theory on the data of real experiments by Fire Research Institute of the Ministry of Home Affaires. That is, we establish one effective formula of estimation of fire spread. This formula is adopted logistic curve and it is also fittable in real conditions of fire spread. Former theories are not able to estimate one fire condition until the end. But our theory can predict the fire condition from the beginning to the end. Equation (3-3) contains the value of G, maximum value of fire spread. This G is the factor which expresses real fire spread phenomena more accurately. Furthermore we consider the adoptation of coefficients αand R. Thisαis Decreasing Coefficient (coefficient of decreasing the value of index a in eq. (3-3)). This R is Resistant Coefficient of fire spread concerning to Distance between houses and Surrounding conditions of houses.
  • 長谷見 雄二
    原稿種別: 本文
    1982 年 311 巻 p. 145-152
    発行日: 1982/01/30
    公開日: 2017/08/22
    ジャーナル フリー
    In contradistinction to the Part 1 of this study (in Transactions of A. I. J., #291, 1980) where we discussed on the criteria on the occurrence of flashover, we study here on the characterization of flashover in transient fire, assuming the occurrence of fiashover itself. The evaluation of the severity of fire development or the prediction of time or condition at the beginning of flashover in fire is an important problem in fire safety design, because there are some sorts of building use for which a fire protection design to prevent the occurrence of flashover is practically impossible. Moreover, while we clarified the criteria on the occurrence of fiashover of zero order reaction system by replacing them to the existence criteria of steady state solution of the basic equations of fire models, a discussion based on the behavior of transient process is indispensable for clarifying strictly the flashover criteria on a system where reaction rate depends on the concentration of oxygen, because an equilibrium exists irrespective of the values of parameters as seen in the simplified model of Thomas and quasi-steady model of Quintiere et al. The aim of this study is to provide a theoretical basis for deriving useful indices and evaluation methods on flashover in transient fire as well as to contribute to clarifying the flashover mechanics of oxygen concentration dependent reaction system. In this report, we derived the following results, by characterizing flashover in transient fire by the instability of temperature fluctuation on the basis of observation facts and the significant features of temperature-time curve when flashover occurs. 1. The thermal state of fire compartment at the transition from early fire to flashover or from flashover to fully-developed fire is given as a solution of |∂(H_1, H_2, …, H_n)/∂(T_1, T_2, …T_n)|=0 where H_i is the right hand side of the energy balance equation for zone i in transient fire and T_i is absolute temperature of zone i. n is the number of zones including the grids for finite difference approximation of thermal conduction equation in solid walls. 2. It was mathematically proved that the transition condition above mentioned is equivalent to the existence criterion of steady state solution of V_i dT_i/dt=H_i, i=1, 2, …, n' where n' is the number of zones except for finite difference grids in solid walls, as the grids are parameterized in the expression of steady state thermal conduction. 3. The methods to give the upper and lower bounds of the temperature of combustible zone at the transition from early fire to flashover are shown. These bounds will be useful for a practical evaluation on flashover.
  • 桝田 佳寛, 友沢 史紀, 矢島 義麿
    原稿種別: 本文
    1982 年 311 巻 p. 153-162
    発行日: 1982/01/30
    公開日: 2017/08/22
    ジャーナル フリー
    We have sampled 1085 concrete core specimens from 91 existing reinforced concrete buildings and tested the qualities of these concrete core specimens. In this paper (Part 1), the actual conditions of the average value of compressive strength, Young's modulus and air-dried weight of unit volume of concrete in each building are investigated. The main results of this paper are as follows. 1) The average value of concrete strength in each building shows a tendency to increase with the completed year of building. 2) The standard deviation in the distribution of concrete strength in each building shows a tendency to decrease after the SHOWA 40's. 3) The peak of the stochastic distribution of compressive strength of concrete in the typical building has a tendency to the small side of strength. 4) Young's modulus and air-dried weight of unit volume of concrete show a tendency to decrease with the completed year of building and in the TOHOKU district.
  • 原稿種別: 付録等
    1982 年 311 巻 p. App2-
    発行日: 1982/01/30
    公開日: 2017/08/22
    ジャーナル フリー
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