-
Article type: Cover
1979 Volume 282 Pages
Cover1-
Published: August 30, 1979
Released on J-STAGE: August 22, 2017
JOURNAL
FREE ACCESS
-
Article type: Cover
1979 Volume 282 Pages
Cover2-
Published: August 30, 1979
Released on J-STAGE: August 22, 2017
JOURNAL
FREE ACCESS
-
Article type: Appendix
1979 Volume 282 Pages
App1-
Published: August 30, 1979
Released on J-STAGE: August 22, 2017
JOURNAL
FREE ACCESS
-
Article type: Index
1979 Volume 282 Pages
Toc1-
Published: August 30, 1979
Released on J-STAGE: August 22, 2017
JOURNAL
FREE ACCESS
-
Article type: Bibliography
1979 Volume 282 Pages
Misc1-
Published: August 30, 1979
Released on J-STAGE: August 22, 2017
JOURNAL
FREE ACCESS
-
Article type: Bibliography
1979 Volume 282 Pages
Misc2-
Published: August 30, 1979
Released on J-STAGE: August 22, 2017
JOURNAL
FREE ACCESS
-
KENJI KUROHA, MITSUTAKA HAYAKAWA, YASURO ITOH
Article type: Article
1979 Volume 282 Pages
1-7
Published: August 30, 1979
Released on J-STAGE: August 22, 2017
JOURNAL
FREE ACCESS
The vacuum prepacked concrete described here is a method for producing high quality concrete with extremely few voids, by reducing pressure of inside of the forms before injection. Flow properties measured by using rotary viscometer are compared with those observed by using irregular passes prepared with coarse aggregate or glass balls filled in the forms. These values show close agreement for Newton flow, but do not for Bingham flow as of cement mortar. For testing flow properties of injection mortar, the authors developed an implement which enables us to obtain relative shear stress yielding value (F_0), relative flow viscosity coefficient (λ), and relative closure coefficient (⊿F_0), by letting mortar flow into a cylinder filled with coarse aggregate to be actually used or model aggregate by gravity. The authors present formulae for predicting an injection pressure for prepacked concrete by utilizing these values obtained by the tests.
View full abstract
-
MORIHISA FUJIMOTO, MITSUMASA MIDORIKAW
Article type: Article
1979 Volume 282 Pages
9-21
Published: August 30, 1979
Released on J-STAGE: August 22, 2017
JOURNAL
FREE ACCESS
A Structure according to current seismic design will undergo deformations well into the inelastic range when subjected to a strong earthquake. In addition, the ground motion during an earthquake is represented by two horizontal and one vertical components. For frame structures, it becomes important to investigate the response to the three components of ground motion acting simultaneously. In this paper, an analytical method for the inelastic dynamic response of steel space frames is presented. The method assumes that a column segment consists of uniaxially stressed fibers along its length. The responses of single-story, single-bay space frames subjected to simultaneous action of two horizontal components of sinusoidal ground acceleration are studied using lumped mass, rigid-floor idealization. The center of resistance coincides with the center of mass in the space frames at initial elastic state. Some of the significant aspects of the results are summarized as follows; 1) Torsional deformation of each column with H-shaped section of which axial force ratio is less than 0.3 and slenderness ratio is greater than 20 scarcely affects the responses of the space frames. On the other hand, torsional deformation of each column with box section have a considerable effect on the responses of the space frames, particularly on the torsional response. 2) The responses of the space frames composed of columns with H-shaped section are greater than those of the plane frames. On the contray, the responses of the space frames composed of columns with box section are nearly identical with those of the plane frames. 3) The torsional responses of the space frames significantly depends on the phase difference between two components of sinusoidal ground acceleration. Especially, the torsional response of the space frames composed of columns with H-shaped section is more influenced by the phase difference than those composed ofcolumns with box section.
View full abstract
-
TATSUO NAKAYAMA, YOSHIKAZU KANOH
Article type: Article
1979 Volume 282 Pages
23-35
Published: August 30, 1979
Released on J-STAGE: August 22, 2017
JOURNAL
FREE ACCESS
In the previous paper, the test results on the strengthes and deformations of the small reinforcd concrete square beams without stirrups subjected to combined flexural shear and torsion were reported. The identical beams with stirrups tested herein are related to the previous work in property. The parameters used for the the design of the test beams are as follows. (1) The ratio of shear span length to full depth (2) The amount of longitudinal reinforcement (3) The amount of web reinforcement (4) Concrete strength (5) The ratio of torsion of shear An empirical equation to calculated the interaction curvessat the first diagonal cracks derived in the previous paper has been applied to the test data, which covers beams with stirrups. It can be seen that the agreenment between predicted and observed test values is very good. The interaction curves between torsional shear stresses and flexural shear stresses at the ultimate strength were presented as ellipse relation, and a formula to calculate the interaction curves is derived.
View full abstract
-
KENZOH YOSHIOKA, TSUNEO OKADA, TOSHIKAZU TAKEDA
Article type: Article
1979 Volume 282 Pages
37-45
Published: August 30, 1979
Released on J-STAGE: August 22, 2017
JOURNAL
FREE ACCESS
The objective of this study is to know how failures of columns develope or how ductility of columns is kept on the basis of experimental data. The various kinds of failure such as the failures of the plastic hinge at the ends of column or the failures at the center of column was presumed by the truss mechanism which varied with the progress of failure. Shear transfer mechanism was also studied by this mechanism. Columns which showed large ductilities fainally failed in the plastic hinges at the ends of the column. Those columns had not only sufficient shear reinforcement at the hinges, but also sufficient shear strength at the center parts of the columns. In such a column the strains of web reinforcements at ultimate condition showed large valure at the ends of the column, while the strains became smaller as nearer the center of the column. When the strains of a part of web reinforcements at the plastic hinge region of any columns reached yielding strain, load carrying capacity of column began to decrease until breakage. Average value of maximum strain of web reinforcements in the plastic hinge region of the column which showed excellent ductility, was about sixty percent of yield strain. It was recognized that shear force resisted by web reinforcements in plastic hinge region increased in proportion to the increase of deflection of the column. In addition to above items, transition of strain distribution and average bond stress distribution of main bars were also examined.
View full abstract
-
NAOTSUNE TAGA, YUTAKA TOGASHI
Article type: Article
1979 Volume 282 Pages
47-56
Published: August 30, 1979
Released on J-STAGE: August 22, 2017
JOURNAL
FREE ACCESS
The purpose of this paper is to investigate dynamic properties of a saturated soil layer due to the variation of the elasticity of a soil skeleton. By applying the wave transfer method and FEM for mixture mechanics to the soil layer, dynamic properties of the soil layer based on the analysis of free vibration, steady state vibration and earthquake vibration are given. Obtained results are as follows. 1. The pore water in the soil affects the natural frequency and amplited ratio in the soil layer, that is, the stiffness and damping action varies due to the elasticity of the water in the layer. 2. This water content effect is dependent on the elasticity of soil skeleton and different according to the type of wave propagation. 3. In shearing motion, the soil layer is softened with the increase of elastic properties of soil skeleton and the damping properties in the layer is increased with same extent. 4. The water saturated in the pore in the dilatational motion, hardens the stiffness of the ground until the phase velocity of soil skeleton corresponding to the propagating velocity of the water and has ilttle effect on the properties of the layer in the velocity greater than that of water.
View full abstract
-
Article type: Bibliography
1979 Volume 282 Pages
55-
Published: August 30, 1979
Released on J-STAGE: August 22, 2017
JOURNAL
FREE ACCESS
-
MATSUTARO SEKI, TSUNEO OKADA
Article type: Article
1979 Volume 282 Pages
57-64
Published: August 30, 1979
Released on J-STAGE: August 22, 2017
JOURNAL
FREE ACCESS
As the fourth part of five serial reports, the characteristics of earthquake response of reinforced concrete frames obtained by the On-line simulation and the computer simulation reproted in the previous papers are examined in detail mainly on the following items; a) skeleton curve under monotonic loading, b) development of cracks, c) shear force-displacement relationships during earthquake response, d) time history of shear force and displacement, e) relationships between maximum response displacement and lateral strength and/or initial natural period and f) comparison between the On-line simulation and the computer simulation.
View full abstract
-
KEISHI SHIONO
Article type: Article
1979 Volume 282 Pages
65-70
Published: August 30, 1979
Released on J-STAGE: August 22, 2017
JOURNAL
FREE ACCESS
A strong motion record by means of a down-hole array was analysed in special references to wave types and the significance of down-hole array recordings in wave type identification was discussed. It was clarified that vertical and horizontal motions are composed mainly of P- and S-waves, respectively. General ideas learned from the analyses here in regard to the application of down-hole array recordings to wave type identification are as follows. (1) Dirct comparison of amplitude-depth relationships to the theoretical mode shapes of various wave types is an effective means for wave type identification. (2) Rayleigh waves can be identified from other wave types by means of the analysis of amplitude-depth relationships. (3) In some cases, amplitude-depth relationships are insufficient for the distinction between S-waves and Love waves because of the similarity of mode shapes. Additional information from frequency-time characteristics is useful to achieve the distinction. (4) Apparent horizontal velocity which connot be analysed by means of down-hole array recordings, is possibly the most effective means for the distinction between body waves and surface waves. This suggests the significance of horizontal array recordings.
View full abstract
-
SABUROH MIDORIKAWA, HIROYOSHI KOBAYASHI
Article type: Article
1979 Volume 282 Pages
71-81
Published: August 30, 1979
Released on J-STAGE: August 22, 2017
JOURNAL
FREE ACCESS
-
NAOHITO HORI, SUKENOBU TANI, YASUO TANAKA
Article type: Article
1979 Volume 282 Pages
83-94
Published: August 30, 1979
Released on J-STAGE: August 22, 2017
JOURNAL
FREE ACCESS
It is the purpose of this report to formulate and solve theoretically the forced motion problems of cantilevered circular cylindrical shells partially filled with liquid subjected horizontal earthquake excitations. For containers, thin cylindrical shells are considered and the internal liquid is assumed to be ideal liquid. The fundamental equations are obtained based on the Donnell approximation, the linear elastic shell theory with small deflection and the linear potential flow theory. The unit mode displacement is obtained by approximating displacement for the axial direction as series of displacement functions for cantilevered beam and by applying the Rayleigh-Ritz method. Assuming that the pressure of internal liquid is devided into the convective pressure and impulsive pressure, the impulsive pressure is represented as the sum of pressures induced by rigid motion and elastic deformation of the shell. Since the frequencies of the first few dominant modes of liquid sloshing are usually much smaller than the frequency of liquid-shell system, the effect of elastic deformation of the shell to the convective pressure are neglected. Numerical computations proved that the response pressure considering elastic deformation of shell is larger than the pressure considering only rigid motion of shell.
View full abstract
-
YOSHITSURA YOKOO, HIROYUKI MATSUNAGA
Article type: Article
1979 Volume 282 Pages
95-106
Published: August 30, 1979
Released on J-STAGE: August 22, 2017
JOURNAL
FREE ACCESS
-
YOUICHI MINAKAWA
Article type: Article
1979 Volume 282 Pages
107-112
Published: August 30, 1979
Released on J-STAGE: August 22, 2017
JOURNAL
FREE ACCESS
Some papers reporting experiments show that shells of revolution subjected to harmonic lateral loads resonate in a lower region of frequency than the lowest natural frequency. In order to make clear the phenomenon we examine the feature of the nonlinear terms of the shells. Then it is shown that what types of nonlinear problems may take place in certain shells of revolution under certain load, and that foregoing nonlinear vibration phenomenon are caused by the accompanying type of nonlinear vibrations. This is ascertained by numerical analyses.
View full abstract
-
SHIGERU UCHIDA
Article type: Article
1979 Volume 282 Pages
113-122
Published: August 30, 1979
Released on J-STAGE: August 22, 2017
JOURNAL
FREE ACCESS
In this paper, we examine the sense of "visually-closed spaces". We discuss the perceived volume, the sense of oppression and the degree of the sense of oppression, using a 1/10 scale model and life-sized model. This paper is mainly consisted of two experiments, which are based on the consideration that the sense of oppression and openness should be dominated by the perceived volume of spaces. In Experiment I, we deal with the perceived volume of "visually-closed spaces" with the 1/10 scale model and make it correspond to physical values. In Experiment II, we discuss the perceived volume of "visually-closed spaces" with the life-sized model of which the walls and ceiling were movable (min. : 1800×1800×CH. 1800mm〜max : 5400×5400×CH. 4800mm). The perceived volume is measured with the magnitude estimation method, and we make the data correspond to physical values. We get results that the perceived volume may be dominated mainly by the physical volume andthe configuration of the plan, for example the solid angle of the walls of spaces.
View full abstract
-
KEIICHI HONMA
Article type: Article
1979 Volume 282 Pages
123-129
Published: August 30, 1979
Released on J-STAGE: August 22, 2017
JOURNAL
FREE ACCESS
Low volume air samplers was used to evaluate the efficiency of dust cleaning devices installed in office buildings. By the investigation on the conditions of the use of the rooms at the same time, the quantity rate of generation of suspended particulate matter within the rooms was calculated. The relationships among these factors are arranged in the forms to be able to use those actual conditions, and the ways to keep the particulate concentration below those air quality standard are discussed.
View full abstract
-
MINORU AKIOKA
Article type: Article
1979 Volume 282 Pages
131-137
Published: August 30, 1979
Released on J-STAGE: August 22, 2017
JOURNAL
FREE ACCESS
Discussions are made on the characteristics of the roots for the characteristic equation |A(s)|=D(s)=0, the characteristics of A(0), the conditions of multiplicity of their roots in the above equation and the method of dealing with in the above case. From the above discussion on the theoretical basis, various indicial responses and the basic equations will be obtained in next Part.
View full abstract
-
SADANORI KOBAYASHI
Article type: Article
1979 Volume 282 Pages
139-147
Published: August 30, 1979
Released on J-STAGE: August 22, 2017
JOURNAL
FREE ACCESS
A series of experiments were carried out using a room model (3m×3m×3m) in order to study surface heat transfer characteristics in a room interior. The first report concerns the characteristics of temperature and natural convection in a non-ventilated room interior. Three Patterns of natural convection were observed in the model room interior : i) the air near the heated side wall rises to the ceiling wall and moves to the opposite cooled side wall along the ceiling wall to fall along the cooled side wall; ii) the air near the heated floor wall rises in the center zone of the room and diffuses radially on the ceiling wall to fall along the four side walls; iii) the air moves reciprocally between the cooled ceiling wall and the heated floor wall. The temperatures of the ceiling and the floor wall surfaces determine the temperature of the side wall surfaces and the vertical distribution of the air temperature, which are thus to be considered relating to each one of the following cases : a) both the ceiling and the floor wall surfaces are cooled or b) heatd or c) the former is cooled with the latter heated or d) vice versa. The gradient of the vertical distribution of the air temperature is the largest in case of d), i. e. when the ceiling wall surface is heated with the floor wall surface cooled and is the smallest in case of c), i. e. when the ceiling wall surface is cooled with the floor wall surface heated.
View full abstract
-
YUKIO KOMATSU, YASUHISA KATO
Article type: Article
1979 Volume 282 Pages
149-154
Published: August 30, 1979
Released on J-STAGE: August 22, 2017
JOURNAL
FREE ACCESS
This report is the results of observations of the temperature and the relative humidity at the inner part of wall panels in summer, and is following the previous report i. e. those of winter. The method and the objects of observations which were taken this time are same as in winter. The results of observations are as follows; 1) In summer, the relative humidity and the temperature of the inner part of walls are higher than in winter as was expected, and the absorption and radiation of moisture by materials of wall inside are more clearly observed. 2) The influence of the relative humidity of outdoor to that of wall inside is very little as far as the observations of a week or so. 3) By these reason, the relative humidity of wall inside tends to be kept constant. And if it is kept in high degree, the deterioration of materials will be accelerated. Inspecting the wall inside by a fiberscope, rusting of the welded part of LGS was observed at the part relative humidity was comparatively high, though it had passed only 3 years since the completion.
View full abstract
-
MAKOTO YANAGISAWA, HIROSHI HARA, HIROSHI ANDO, NATSUNORI HIRATA, TOSHI ...
Article type: Article
1979 Volume 282 Pages
155-167
Published: August 30, 1979
Released on J-STAGE: August 22, 2017
JOURNAL
FREE ACCESS
The state of the public services with facilities should be evaluated in consideration of the points as follows. 1. The life range of inhabitants consist of daily living area and extensive living area : We regard as the former corresponds to the "sprinkler facilities" which should be well located over the area for daily use, the latter to the "concentrated facilities" which should be stocked enough somewhere in the area in time of need. 2. The public services with facilities that inhabitants require have been extremely varied : We started to devide the social fields according not to classifying existing facilities but to setting up life functions, into 6 fields : "safety", "health", "welfare", "education", "convenience" and "confortableness". Each field is evaluated separately, and lastly put together. 3. Paid full attention to the quality of the services, indicaters should be selected : We took noctice the means of the services. And we regarded as they mainly consist of "Man", "Tool" and "Space". Then we made efforts to select proper indicators for every means as equally as possible. Based on the above mentioned points, 36 indicators were adopted, with which we have evaluated the state of the facilities in the three greatest metropolitan areas in Japan; Tokyo, Osaka and Nagoya area (Each of them is difined as the inside part of 30 kirometers geometrical circle around the metropolitan center : Nihonbashi, Yodoyabashi and Kanayamabashi were taken as the centers.) As the results of the evaluation : In Tokyo area, while the marks of the "sprinkled facilities" are low for "safety" and "welfare" compared with other fields, those of the "concentrated facilities" are high for "safety", "education" and "comfortableness". In particullar, the "sprinkled facilities" of the area with in the range of 10 kirometers get remarkablly high marks. In Osaka area, while the marks of the "sprinkled facilities" are high for "health", low for "safety". Those of "concent rated facilities" are high for "comfortableness", and average for the others. In Nagoya area, the marks of the "sprinkled facilities" are rather high for "safety" and "welfare". But those of the "concentrated facilities" are low especially for "safety", "convenience" and "education", and also inferior to Tokyo and Osaka area as a whole.
View full abstract
-
Yasuo Takahashi
Article type: Article
1979 Volume 282 Pages
169-176
Published: August 30, 1979
Released on J-STAGE: August 22, 2017
JOURNAL
FREE ACCESS
This paper, taking over the preceding papers, will deal with the problem of the formative period by investigating the stage of Cho and Machigumi grawing. Contents of this is as follows. 1. Disputed point. 2. Analysis of the affair in the seventh year of Daiei Period. 3. Toward the establishment of the Rokucho Organization.
View full abstract
