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Article type: Cover
1975Volume 230 Pages
Cover1-
Published: April 30, 1975
Released on J-STAGE: August 22, 2017
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Article type: Cover
1975Volume 230 Pages
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Published: April 30, 1975
Released on J-STAGE: August 22, 2017
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Article type: Index
1975Volume 230 Pages
Toc1-
Published: April 30, 1975
Released on J-STAGE: August 22, 2017
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Article type: Appendix
1975Volume 230 Pages
App1-
Published: April 30, 1975
Released on J-STAGE: August 22, 2017
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TOMOZO SOSHIRODA
Article type: Article
1975Volume 230 Pages
1-9,109
Published: April 30, 1975
Released on J-STAGE: August 22, 2017
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Anisotropy and heterogeneity characteristics of concrete were investigated by splitting tensile tests on cube or prism specimens. The tensile strengths when the stress was applied in the same direction of casting were lower than those when the stress was applied in the right angle to the direction of casting, and, in the former case those in the top portion were lower than those in the bottom. The direct and main cause of the tensile anisotropy of concrete may be defects under aggregate paticles brought from the instability of fresh concrete, especially bleeding. It may be stated that concrete is recognized as an anisotropic material relative to the casting direction by tensile test.
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MAKOTO YOSHIOKA, HIDENORI ONO, [in Japanese]
Article type: Article
1975Volume 230 Pages
11-19,109
Published: April 30, 1975
Released on J-STAGE: August 22, 2017
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This paper deals with fundamental studies of the resistance to wear of artificial light-weight aggregate concrete. Experimental results are presented concerning the effects on the wear of concretes of the kinds and combinations of aggregates used, water-cement ratio, cement content, and sand percentage. The conclusions obtained are as follows : (1) The artificial light-weight aggregate concrete is less resistant to wear than concretes containing relatively harder aggregates as river sand and gravel, i.e., wear loss of the former is three times as much as the latter. (2) When river sand, harder fine aggregate, is combined with light-weight coarse aggregate, the concrete is more resistant to wear than that which contains both fine and coarse artificial light-weight aggregates. (3) The resistance to wear of concrete varies inversely proportional to the water-cement ratio, and directly proportional to the compressive and tensile strength and hardness. (4) No significant correlation was found to exist between the cement content, sand percentage and the resistance to wear of artificial light-weight aggregate concretes.
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SHIGERU WAKAYAMA, KAZUO GOTO, MAKOTO YOSHIOKA
Article type: Article
1975Volume 230 Pages
21-28,110
Published: April 30, 1975
Released on J-STAGE: August 22, 2017
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This is the 4th report of Production Analysis of Pre-cast Concrete Construction. In the former reports we stated 1. the purpose of this study, 2. the explanation of production analysis, 3. a detailed method of the analysis, 4. the amount of man-hours of usual pre-cast concrete components in relation to their forms, 5. the difference of man-hours among several production methods, 6. the man-hours of some particular forms of components, 7. the man-hours involved in the assembling of steel units. In this reports we analyse man-hours involved in the production of pre-cast concrete components in relation to their forms, synthetically, on the 92 samples from the data listed in former reports. And we also analyse the man-hours involved in each process of production.
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MINORU YAMADA, HIROSHI KAWAMURA
Article type: Article
1975Volume 230 Pages
29-35,110
Published: April 30, 1975
Released on J-STAGE: August 22, 2017
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In order to make sure the reasonableness of the analytical equations and methods presented in the previous paper which gave the flexural deformation characteristics and fatigue characteristics of structural members and sections composed of plate elements, calculations on H-columns are carried out, and their results are compared with test results. As an application example, using the analytical equations and procedures mentioned above, calculations are performed in order to estimate the aseismic capacity of column-yielding type rigid frames without braces composed of 300mm series H-columns. As a result, it is shown that cross sectional area ratios between flange and web elements of H-sections and axial load level ratios are the main factors for the aseismic safety of such frames and that the critical load level ratio is found to be about 1/6.
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YOSHIKATSU TSUBOI
Article type: Article
1975Volume 230 Pages
37-42,110
Published: April 30, 1975
Released on J-STAGE: August 22, 2017
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BEN KATO, HIROFUMI AOKI
Article type: Article
1975Volume 230 Pages
43-51,110
Published: April 30, 1975
Released on J-STAGE: August 22, 2017
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Welded steel tube which outside diameter is from 6 inches to 20 inches is popularly manufactured by cold forming and electric resistance welding. This cold forming consists of uncoiling, leveling, roll forming, sizing and straighting. These producing processes can be idealized to primary strain states. For example, flat steel sheet which was uncoiled and leveled, is bent to the circumferential direction in the state of plane strain at the roll forming process, and free from the constraint of the longitudinal direction. Assuming such simplified strain state of each process, the locked in stress induced by cold forming was analized by the mathematical theory of plasticity. Prandtl-Reuss equation was used to the stress-strain relationship of the steel material in plastic range. And isotropic hardening and independent hardening were adopted as hardening rules. But welding thermal residual stress was not considered in this analysis. Results from this calculation were compared with the released strain obtained by saw cutting of 318.5φ×10.3t grade STK 41 and STK 50 steel tubes. Finally, nominal stress-strain relationships in stab-column tests were calculated concerning the plastic strain history and locked in stress obtained from this analysis. these results were also compared with the experiments 356φ×6.3t, 356φ×11.0t grade STK 41 steel tubes.
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TAKEKAZU TAGUCHI, AKIRA SASAGAWA
Article type: Article
1975Volume 230 Pages
53-61,111
Published: April 30, 1975
Released on J-STAGE: August 22, 2017
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This paper is theoretical and experimental studies to find the suitable shape of the stiffener ring in the case of eccentric connections. Four kinds of model specimens having different eccentricity and the different shape of the stiffener ring are planned. In each kind we test two types. One of them is filled with concrete, and the other is not. In consequence of experimental research, we can find the appropriate shape of the stiffener ring according to eccentricity. On the theoretical study, we substitute the stiffener ring for the statically indeterminate ring. And then we can obtain the values of the stresses of each point and the deflections of the stiffener ring by using the energy method. As the result, it is evident that the theoretical values of the stresses and the deflections of the stiffener ring approximate experimental them.
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TAKASHI KUSAMA
Article type: Article
1975Volume 230 Pages
63-71,111
Published: April 30, 1975
Released on J-STAGE: August 22, 2017
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In this paper, the behaviours of the beam of finite length on the elasto-plastic foundation are discussed in the case when the beam is subjected to single load which increases gradually. The results of this study are as follows : 1) The process of collapse of the beam can be expressed by two dimensionless values Ψ and γ as shown in figure (1). 2) The ultimate load and the form of collapse are calculated by using the equations (11)〜(17). 3) The maximum values of p_e/p_u lie on the line which is obtained by the equation (28). 4) Throughout the elasto-plastic region, we can classify the absolutely rigid beams and the infinitely long beams by using the equation (30). 5) The load-deformation of relations the beam are easily anticipated by the figure (5) together with solutions for the infinite long beam obtained in the previous paper.
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TOSHIO MOCHIZUKI
Article type: Article
1975Volume 230 Pages
73-83,111
Published: April 30, 1975
Released on J-STAGE: August 22, 2017
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This paper describes an investigation into the actual conditions and distributions of wooden houses on the all districts in Tokyo as to their uses, number of stories, lapse after construction and the ratio of effective wall length to building area. And also the author pursues their process into collapse and measures their vibrational damage by the earthquake response analysis which is considered the above mentioned conditions of them. Calculated damage ratios show good agreement with actual damage of wooden houses due to Kanto Earthquake 1923 in the downtown districts which have comparatively thick alluvium.
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YOSHIMI URANO, OSAMU ISHIHASA
Article type: Article
1975Volume 230 Pages
85-90,112
Published: April 30, 1975
Released on J-STAGE: August 22, 2017
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In Part I, The basic theory and its application to the thermal network method in the calculation of the unsteady heat load was explained. In Part II, An analysis of room air temperature fluctuation was carried out using this basic theoretical analysis. An actual thermal network was prepared and good results acheived. In this paper, using the basic theory set out in part I, we will prepare a thermal network of a subject room and report on the results of a thermal network analysis of heat extraction rate by air conditioning and the fluctuation of space temperature without air conditioning.
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YOSHIO INOUE
Article type: Article
1975Volume 230 Pages
91-97,112
Published: April 30, 1975
Released on J-STAGE: August 22, 2017
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This is one of the most common fittings of a return air duct system. In spite of this, there have been relatively few theoretical investigation of the pressure loss in these fittings and leading reference books contain little information on this subject. Some efforts already have been made in answering these problems. In 1959, Niitsu et al. made tests on this type fittings and offered empirical formulas from their results. But these formulas have no wide application range. This paper attempts to give a survey of this field by setting up the theoretical formulas for this type of flow and fittings. These theoretical formulas are gained on several assumptions as a result of momentum theory applied to confluent air flow in this type fittings. The charactor of resistance of this type fittings may be explained qualitatively by these theoretical formulas. A few laboratory tests have been made on the fitting models of near full scall at Osawa Memorial Laboratry, Department of Architectural Environmental Engineering, Kanto-Gakuin University by the auther. The theoretical formulas are modified with the auther's test results and the available experimental data by Niitsu et al. The modified formulas are given a name "Modification of the applied theoretical formulas". Within the limits of this test results and the experimental data, these modification formulas would be more extensively useful in the application range than the restrictive empirical formulas by Niitsu et al. These modification formulas may be more exactly agreeable with their experimental data than their empitical formulas.
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SADAAKI OGISO, KOHICHI SUGIMOTO
Article type: Article
1975Volume 230 Pages
99-108,112
Published: April 30, 1975
Released on J-STAGE: August 22, 2017
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The tea-ceremony room has generally many windows, though the room itself is very small. The depth of tea-ceremony room is in many cases 1.5 or 2ken (2.7 or 3.6 meters). So to give the necessary illumination through out the room, there need not be so many windows. The fact that they have many windows, is therefore showing the tea-masters' unique design, very carefully considering the lighting effect in each space of the room, on the figure of guests or on the several tools used by the master etc. We had first selected 50 samples and studied on the standard condition of their light environment. Next about the 17 rooms, we had actually measured the distribution of illumination. Both results may be useful as the materials to study the lighting condition of tea-ceremony room.
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