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Article type: Cover
1979 Volume 283 Pages
Cover1-
Published: September 30, 1979
Released on J-STAGE: August 22, 2017
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Article type: Cover
1979 Volume 283 Pages
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Published: September 30, 1979
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Article type: Appendix
1979 Volume 283 Pages
App1-
Published: September 30, 1979
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Article type: Index
1979 Volume 283 Pages
Toc1-
Published: September 30, 1979
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Article type: Appendix
1979 Volume 283 Pages
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Published: September 30, 1979
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SACHIO MASUZAWA
Article type: Article
1979 Volume 283 Pages
1-10
Published: September 30, 1979
Released on J-STAGE: August 22, 2017
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The writer has developed a quite new construction technique of PC diaphragm wall so as to maintain high accuracy of PC wall in construction. The sequence of the construction of the PC diaphragm wall by newly developed method is as follows : 1. Excavating trench using normal fluid mud. 2. Setting of PC panels in the trench filled with bentonite slurry. 3. Adding water glass first and then cement paste in slurry, carrying out air agitation against slurry through the nozzels mounted on the end of the pipes installed in the PC panels. Slurry mixed with water grass and cement paste becomes hard clayey substance in uniform quality with high impermeability as time elapses. This paper describes factors which affect the strength of the aforesaid substance and physical property of the substance.
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KOICHI KISHITANI, NORIMOTO KASHINO
Article type: Article
1979 Volume 283 Pages
11-16
Published: September 30, 1979
Released on J-STAGE: August 22, 2017
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Outdoor exposure tests and accelerated carbonation tests were conducted with the aim of ascertaining the limit of the depth at which corrosion of reinforcing steel will occur from the viewpoinit of pH gradient formed from the concrete surface accompanying the phenomenon of carbonation of concrete. Experiments were simultaneously carried out to confirm the influences of initial conditions and environmental conditions on corrosion of reinforcing steel. As a result, the following were clarified : 1. The phenolphthalein method, when using ordinary materials and under ordinary environment, is amply useful for judging limit of depth at which corrosion of reinforcing steel will occur due to carbonation. 2. The abovementioned limit seen from carbonotion is thought to be at 6 to 8mm deeper than the depth of carbonation measured by the phenolphthalein method. When chlorides are contained, it is thought the limit is 10mm farther inside. 3. Rust inhibitors used in suitable amounts for chloride content of the degree resulting from use of marine sand may be expected to provide rust preventive effects. 4. Even though slight corrosion may occur initially, the corrosion will be inhibited from progressing depending on lowering of humdity and the finishing material selected.
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SAKICHI OHGISHI, MITSUO WADA
Article type: Article
1979 Volume 283 Pages
17-25
Published: September 30, 1979
Released on J-STAGE: August 22, 2017
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MASAIKI UEDA, YOSHIZO DOBASHI
Article type: Article
1979 Volume 283 Pages
26-36
Published: September 30, 1979
Released on J-STAGE: August 22, 2017
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This report is concerned with a material nonlinear analysis of reinforced concrete slabs by the mixed finite element method as an application of the initial stress method, taking advantage of laminated elements. Introduced into this method are (1) the nonlinear stress-strain matrices proposed by Kupfer et al. for biaxial state of stresses and (2) an elasto-plastic stress-strain relationship assumed to hold only within biaxial compressive range. Herein discussions are made on the effects of failure conditions of concrete and on such process of transition of the resulting solution as is idealized by a stress intensity reduction curve taking account of the tension stiffening effect. Subsequently the adequacy of the adopted procedure is well substantiated by the comparison among the present solution, previous solutions by some other workers, and the test results obtained by them in a few and those by the authors in more varied cases of supporting conditions of slabs.
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YOSHIHIKO KOORI, SHIZUO YAMAMOTO, NOBUYUKI SHIMIZU
Article type: Article
1979 Volume 283 Pages
37-48
Published: September 30, 1979
Released on J-STAGE: August 22, 2017
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Computational results of soil-structure interaction problems are studied by using Thin Layer Element Method (Semi-analytical Finite Element Method) in the cylindrical coordinates.
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KAZUO INOUE, MASAHIRO NAGATA
Article type: Article
1979 Volume 283 Pages
49-57
Published: September 30, 1979
Released on J-STAGE: August 22, 2017
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Due to the degrading restoring force characteristics of a bracing member, decrease in ultimate strength and ncrease in displacement response of braced frames subjected to severe earthquake are recognized. Inelastic behavior of braced frames under the seismic loads depends directly on the slenderness ratio of a bracing member (λ) and the ratio of story shear force shared by bracings to total shear force (β). To avoid excessive plastic drift, it is necessary to take the degrading restoring force characteristics of a bracing member into account in the process of designing. This paper describes a procedure to estimate the seismic design load factor as a function of λ and β, and to design strong column-weak beam braced frames.
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MINORU YAMADA, HIROSHI KAWAMURA
Article type: Article
1979 Volume 283 Pages
58-67
Published: September 30, 1979
Released on J-STAGE: August 22, 2017
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Continuing to the preceding paper (III), in which the aseismic capacity of steel structures composed of rigid frames with symmetric braces were discussed on, the purpose of this paper is to make clear the aseismic capacity of steel structures with asymmetric braces in plan from the point of view of technology. First, steel structures with asymmetric braces are divided into two types, i.e. torsional rigid and flexible ones. Successively, based on the fundamental idea of the steady-state resonance of torsional vibration as an ultimate state, analytical procedures to obtain the resonance-fatigue characteristics of torsional flexible type steel structures with asymmetric braces are presented. Finally, evaluation criteria and procedures of the aseismic capacity and safety of such structures are proposed.
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SATSUYA SODA, SUKENOBU TANI
Article type: Article
1979 Volume 283 Pages
68-75
Published: September 30, 1979
Released on J-STAGE: August 22, 2017
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In the statistical analysis of dynamic behaviour of elastic-plastic structures, Equivalent Linearization Method is very useful and practical because of the simplicity of its theory. But the method loses the accuracy as the structure becomes to show large deflection and strong non-linearity. In this paper, the cause of the loss of the accuracy is examined and the method is modified to be applicable to the analysis of strong non-linear structures. The cause of the loss of the accuracy is assumed to be the loss of the stability of the displacement hysteresis which is attended with an unstable fluctuation of the center of oscillation. The shift of the center of oscillation is calculated based on the assumption that the running average of the external force in one cycle is not zero and the work done by this average force is transfered into the added plastic deformation in one way. Non-stationary RMS response to the stationary and non-stationary white noise is calculated by digital simulation and by author's method. It is shown that both results coinside fairly well each other and that a little diffierence of the spectral characteristics of the excitation in the long period region causes no small difference of the displacement response.
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TSUTOMU KOKAWA
Article type: Article
1979 Volume 283 Pages
76-86
Published: September 30, 1979
Released on J-STAGE: August 22, 2017
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In this paper, based on the analytical method developed in the previous paper, the general buckling (symmetric buckling or antisymmetric bifurcation buckling with respect to the longitudinal center line) behaviours of C.R.S.R. with simply supported ends, subjected to external pressure, were studied numerically introducing Classical Buckling Pressure (the critical hydrostatic pressure of the full Reticulated Cylindrical Shells), under various (1) reticular parameters, (2) generator edges, (3) shell geometries. In the §2, the author investigated the general buckling behaviours of C.R.S.R. in the range of (1) γ=ζ=0.5, α=60°, that to say isotropic, (2) pinned, simply supported, free edges, (3) μ_h=100〜300, β=1, 1/1.5, 0.5. In the §3, the author investigated the general buckling of three types of orthotropic C.R.S.R. In the §4, the analytical values were compared with experimental values in the case of isotropic with free, fixed genera-tor edges.
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MASANORI SHUKUYA, KENICHI KIMURA
Article type: Article
1979 Volume 283 Pages
87-97
Published: September 30, 1979
Released on J-STAGE: August 22, 2017
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MINORU AKIOKA
Article type: Article
1979 Volume 283 Pages
98-105
Published: September 30, 1979
Released on J-STAGE: August 22, 2017
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In this paper, first, are pointed out miscellaneous indicial responses, being found on the theoretical results of Part 2. And next, the basic equations in which the unknown rooms' temperature are variables, of transient room temperature for multi-room are developed. And the equations of surface temperature are indicated.
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MASAJI KANESHIMA, ICHIYA HAYAKAWA
Article type: Article
1979 Volume 283 Pages
106-110
Published: September 30, 1979
Released on J-STAGE: August 22, 2017
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Thermal load of District Cooling and Heating was considered as the normal distribution curve. Then the series network of the distribution pipe with various numbers of node and two patterns of the distribution pipe with 26 nodes were selected to simulate the total friction loss of the piping network. Cosequently the concept of the diversity factor of the piping network was obtained and the proper thermal load of the piping network was gotten in considering the fluctuating thermal load to simulate the relation between the thermal load of each building and the total friction loss of the piping network by Monte-Carlo method. So the calculating method of the proper thermal load to decide the pipe diameter and the deciding method of the total friction loss for the selection of a pump were obtained.
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SHIGEYUKI OKAZAKI
Article type: Article
1979 Volume 283 Pages
111-119
Published: September 30, 1979
Released on J-STAGE: August 22, 2017
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SATORU ASHIKAWA
Article type: Article
1979 Volume 283 Pages
120-125
Published: September 30, 1979
Released on J-STAGE: August 22, 2017
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This paper is depend upon the fundamental study of "Activity Contour". In this report, "R^f" is defined from the viewpoint of the quality of water flowing on the curved surface of activity contour. "R^f" is the structural concept of ordinary contour surface. The concept of "R^f" is stand on the concept of "R" (Ridge) which is the structural concept of closed curve. In this report, as part 1, the definition of "R^f" is explained as the extension to three dimensional space of the concept of "R".
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SHIRO AOKI, YOSHIRO YAMAMORI
Article type: Article
1979 Volume 283 Pages
126-132
Published: September 30, 1979
Released on J-STAGE: August 22, 2017
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This report proposes a planning method to select the optimum land use of suburban area according to requirements of cities and also the country sides. So we take the common scale between urban and rural district indicating regional transformation. The scale consists of 'urbanization' indexes such as increasing rate of population (from 1965 to 1970), persons per household, ratio of aged population, farm household ratio, full-time farm household ratio to all, increasing rate of farm household, increasing rate size of cultivated land per farm household, conversion ratio of farm land to non-farm uses. agricultural productivity of land. The planning process is as follows; 1 Regional classification by the 'urbanization' indexes, 2 Zoning by the assessment of the indexes, 3 Selection of the optimum land use.
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YASUO TAKAHASHI
Article type: Article
1979 Volume 283 Pages
133-141
Published: September 30, 1979
Released on J-STAGE: August 22, 2017
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Contents are mainly classified by three items as follows : 1. How to reproduce spatial form of Tsuchimikado-Square. 2. Spatial form, site planning and Inhabitants of Tschimikado-Square in the fourth year of Hotoku (A.D. 1452). 3. A consideration on spatial structure of Tsuchimikado-Square.
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SEIROKU OHTA
Article type: Article
1979 Volume 283 Pages
142-149
Published: September 30, 1979
Released on J-STAGE: August 22, 2017
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I proved that the origin Hachiman-zukuri may be trace to an ancient dwelling house.
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YUICHI SAITO, SABURO HORIUCHI
Article type: Article
1979 Volume 283 Pages
150-159
Published: September 30, 1979
Released on J-STAGE: August 22, 2017
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We made a research on the fire spreading speed of wooden houses in the downwind eddy behind a fire-resistant building. This report runs as follows : -(1) Eddy areas were observed carefully, and a reattachment point were obtained in connection with the aspect ratio of the building. The reattachment point is the downwind limit of the eddy. (2) Distributions of the wind velocity in the eddy were searched. Its maximum value appears in the middle point between the building front and the reattachment point. (3) The relations between V_∞ and V_i were investigated in the wind tunnel. V_∞ means the velocity of wind which blows in the sky higher than the building and is free from the influence of it. V_i is that of the inverse flow in the downwind eddy behind the building. A formula combining V_∞ and V_i was obtained. (4) The buring tests were made in following two ways A & B. A : fire spreading speed from the ignited crib to the adjacent downwind crib. B : fire spreading speed from the adjacent crib to the further adjacent crib. Each case of A & B was done with 3 scaled cribs (i.e. 1/200, 1/100, 1/80 of full scale). (5) The relationships of experimental fire spreading speed in regard to above mentioned 3 scales were obtained by the method of least square. (6) The relationships of (5) were extended to scale 1/1 (full size) by exrtrapolation. Comparing the results gotten by extrapolation wite those by an actual fire spreading speed formula (for instance, Hamada's formula) using V_i instead of V_∞, the former proved to be about 50% of the latter. (7) The fire spreading formula obtained from the above results was applied to actual fires, and the obtained values were compared with the actual values of the fire data. They proved to be approximately equal. Conclusion : The fire spreading speed of wooden houses in the downwind eddy behind a fire-resistant building are scarcely about 50% of ones by another fire spreading formula, using inverse wind velocity V_i instead of fair wind V_∞.
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[in Japanese]
Article type: Article
1979 Volume 283 Pages
160-
Published: September 30, 1979
Released on J-STAGE: August 22, 2017
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[in Japanese], [in Japanese], [in Japanese]
Article type: Article
1979 Volume 283 Pages
161-
Published: September 30, 1979
Released on J-STAGE: August 22, 2017
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