Transactions of the Architectural Institute of Japan

[title in Japanese]

Article type: Cover
1974 Volume 220 Pages Cover1-
Published: June 30, 1974
Released on J-STAGE: August 22, 2017

DOIhttps://doi.org/10.3130/aijsaxx.220.0_Cover1

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[title in Japanese]

Article type: Cover
1974 Volume 220 Pages Cover2-
Published: June 30, 1974
Released on J-STAGE: August 22, 2017

DOIhttps://doi.org/10.3130/aijsaxx.220.0_Cover2

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[title in Japanese]

Article type: Index
1974 Volume 220 Pages Toc1-
Published: June 30, 1974
Released on J-STAGE: August 22, 2017

DOIhttps://doi.org/10.3130/aijsaxx.220.0_Toc1

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[title in Japanese]

Article type: Appendix
1974 Volume 220 Pages App1-
Published: June 30, 1974
Released on J-STAGE: August 22, 2017

DOIhttps://doi.org/10.3130/aijsaxx.220.0_App1

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KINEMATIC ANALYSIS OF CONCRETE MEMBERS UNDER COMBINED STRESSES : (Part 3) "Wegde Theory" for the Bearing Capacity of Plain Concrete

YASUYOSHI SUENAGA, RINTARO ISHIMARU

Article type: Article
1974 Volume 220 Pages 1-7,63
Published: June 30, 1974
Released on J-STAGE: August 22, 2017

DOIhttps://doi.org/10.3130/aijsaxx.220.0_1

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This paper intends to obtain theoretically the bearing capacity of plain concrte. It has been able to be solved with Dr. Cowan's failure criteria. A general idea of "Wedge Theory" is next. In consideration of the partial compression failure, at first, a rigid zone of wedge is thought under the loading part, next, this "wedge" push in. And tensile crack will take place. As soon as the tensile strength reaches the capacity, the "wedge" will move, then the failure will occure. By the way, as though the form of this wedge is assumed of variaty, the failure has to occure at the minimum load, so that the most suitable form of this wedge is caluculated as the solusion of the extremum problems, which is constracted with the previous failure criteria. In this way, the upper and lower limit bounds of the bearing capacity have been studied with kinematic analysis method. And in the results of this analysis, this capacity is sure of the upper bound value according to compare with test results.

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ANALYSIS OF MUTI-DEGREE OF FREEDOM SYSTEMS WITH COMPLEX STIFFNESS AND IT'S APPLICATIONS : Part 1 Modes Super-position Method Applied to Multi-Degree of Freedom Systems

YOSHIYUKI TSUSHIMA, JUNICHI JIDO

Article type: Article
1974 Volume 220 Pages 9-18,63
Published: June 30, 1974
Released on J-STAGE: August 22, 2017

DOIhttps://doi.org/10.3130/aijsaxx.220.0_9

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Extending the concept of Complex Spring constant to a multi-degree of freedom system, we can write the equations of motion in generalized coordinates x_i(i=1, 2, …, n) as follows; [M]{x}+[K_R+isgnωK_I]{X}=-x_0[M]{C} where [numerical formula] The characteristics of this method is that the damping valuses of each mode are appreciated independently of frequencies corresponding to the damping capacity of the structural elements in freedom systems. We make an investigation into mathematical characteristics as follows; 1) The eigenvalues and eigenvectors occur as complex conjugate pairs according to a function sgnω, which are a linearly independent set. 2) The eigenvectors establish the orthogonality properties in the eigenvectors of sgnω=1 or sgnω=-1, but the orthogonality relationships couldn't be found in the eigenvectors between sgnω=1 and sgnω=-1. 3) In view of the above mathematical properties, the n equations of motion are reduced to n pairs of uncoupled conjugate linear differential equations, and the solution can be obtained by means of mode superposition.

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ON SEISMIC INCIDENT WAVES TO SOIL LAYERS FROM BEDROCK

HIROSHI KAGAMI, HIROYOSHI KOBAYASHI

Article type: Article
1974 Volume 220 Pages 19-28,64
Published: June 30, 1974
Released on J-STAGE: August 22, 2017

DOIhttps://doi.org/10.3130/aijsaxx.220.0_19

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SPATIAL CORRELATIONS OF THE FLUCTUATING WIND PRESSURE GENERATED ON THE SIDE SURFACE OF A MODEL WITH LONG RECTANGULAR SECTION

HATSUO ISHIZAKI, JUNJI KATSURA

Article type: Article
1974 Volume 220 Pages 29-34,64
Published: June 30, 1974
Released on J-STAGE: August 22, 2017

DOIhttps://doi.org/10.3130/aijsaxx.220.0_29

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To investigate fluctuating wind forces induced by seperating and reattaching flow, pressures on the side surface of a two-dimensional model having a rectangular section of the ratio 1 : 7.5 are measured. Distributions of static pressures and rms values of fluctuation made by turbulent flow are different from those of smooth flow. It is found that the turbulence in the general flow make the seperating flow more turbulent and unstable. However, correlations are not different in the both cases of turbulent and smooth flows, and roughly similar to the cace of the wall pressure bneath the turbulent boundary layer. The fluctuations of pressure accompanying reattaching flow are less correlated and more negatively correlated in the space along the flow direction than the those of the wall pressure without reattaching flow. Spatial correlations are integrated over limited areas near the center of side surface. The result shows that the rms force coefficients on the areas d×d and 2d×2d are 0.65 and 0.45 times of the rms pressure coefficient respectively. (d; charactaristic length of the model).

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ANALYSIS OF CABLE NETS IN MIXED FORMULATION : Part II-Rigoros Solution of the Geometrically Nonlinear Problems

EIKI MAGARA, JIRO KUNITA, SHIGEYA KAWAMATA

Article type: Article
1974 Volume 220 Pages 35-45,64
Published: June 30, 1974
Released on J-STAGE: August 22, 2017

DOIhttps://doi.org/10.3130/aijsaxx.220.0_35

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This part of the paper presents the method of rigorous solution of various kinds of geometrically nonlinear problem of cable nets. The potential energy function for link mechanisms derived in part I is easily enlarged to the case of cable nets by the introduction of the strain energy term. The potential energy functions for the problems of cable nets are written in the form corresponding to Hellinger-Reissner principle in the continuum mechanics and lead to the basic equations in the form of mixed formulation where strain-displacement relation in the rigorous form is taken. The basic equations are derived for the following problems of the cable nets; 1) analysis of static responce against external loads in the case of clamped node cables where the cable intersections are clamped 2) analysis of static responce of the clamped node cables under the initial axial forces corresponding to prestress, 3) shape determination of the clamped node cables when pretension is applied from turnbuckles inserted in the arbitrary position of the networks, and 4) shape determination for the case where nodes are loose, intersecting cables being able to slip against each other, and the arbitrary cables are tensioned. Application of Newton-Raphson method to the basic nonlinear equations is described, and it is shown that the analysis in the form of the displacement method is possible in the respective stages of the iteration by the elimination of correction increment of the axial forces. Finally, the method of analysis is illustrated by the examples of shape determination and responce analysis against the external loads of actual cable nets for hanging roofs.

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ON FORMULATION OF DYNAMICAL CHARCTERISTICS OF A WATER-SATURATED SANDY SOIL GROUND

TAKUJI KOBORI, TSUYOSHI TACHIKAWA

Article type: Article
1974 Volume 220 Pages 47-53,65
Published: June 30, 1974
Released on J-STAGE: August 22, 2017

DOIhttps://doi.org/10.3130/aijsaxx.220.0_47

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For the asseismic design of building structures, civil engineers have been interested in the dynamical characteristics of the sub-soil ground, that has been often assumed to be a perfectly or viscoelastic body such as a Voigt solid, so as to obtain the dynamical effect of the sub-soil ground. However, the dynamical characteristics of the sub-soil ground, which substantially, consists of soil particles, airs and waters in its void, cannot sufficiently be explained by such an elastic or viscoelastic body. In order to understand the soil ground as the multi-phase medium, authors consider the Biot's model composed of a porous elastic solid saturated by a viscous fluid in this paper. And we discuss on the formulation of the physical relationship between this model and the water-saturated sandy soil. In Sec. 2 it is mainly pointed out that the damping coefficient b involved in basic Eq. (2. 3-4) is related to Darcy's coefficient of permeability. In Sec. 3 the compatibility conditions are derived from the fact that the dilatations of both the porous elastic solid and the pore fluid in this water-saturated sandy soil can be physically interpreted. In Sec. 4 we introduce the several relationships between the coefficients describing stress-strain relations of this model and constants used in soil engineering. Moreover, in Sec. 5 is represented an approximate method to obtain the shear modulus of this model using the modulus of dry sand. In Sec. 6 are derived the phase velocities and the attenuation factors of body waves and Rayleigh waves. And also it is shown that the boundary permeability conditions at free surface are unable to be expressed by using the only, Darcy's coefficient except some limiting cases.

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CONSTRUCTION OF VISUAL PERSPECTIVE TRANSFORMATION SYSTEM AND ITS APPLICATION TO VISUAL SPACE PERCEPTION-(III) : Functionalization with anisotropy and construction of anisotropic visual perspective coordinate system

SHINICHI MURAKAMI

Article type: Article
1974 Volume 220 Pages 55-62,65
Published: June 30, 1974
Released on J-STAGE: August 22, 2017

DOIhttps://doi.org/10.3130/aijsaxx.220.0_55

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An experiment of anisotropy on perception of length in peripheral vision was carried out for the purpose of further investigation with the results of the author's previous experiment (2nd report). It was suggested, in the 2nd report, that either some charactor of constancy in problem of parallelness is in existence or anisotropy of&lrtri;coordinate system itself is in existence, from the experimental fact of subjectively adjusted parallel lines were not expressed geometricaly parallel but concaved against point of fixation in&lrtri;coordinate system. Accordingly, requiring experimentally PSE of perceived length with the direction of the upper, lower, right and the left side against the point of fixation in peripheral vision, and then set up the regression equation between the PSE of the two arbitrary direction. On the bases of the equation, the well known visual anisotropy phenomena were investigated. Continuously interposing the&lrtri;_0 transformation, the coefficient of principal directional anisotropy were required, and under some assumption with the anisotropy for arbitrary direction, an anisotropic cooridnate system for perspective vision was construted, which represents the subjective localization against objective stimulus. The author named the anisotropic coordinate system as&lrtri;_1 coordinate system, and consider the meaning of it, further, reexamined the result of experiment II with it.

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[title in Japanese]

Article type: Appendix
1974 Volume 220 Pages 63-
Published: June 30, 1974
Released on J-STAGE: August 22, 2017

DOIhttps://doi.org/10.3130/aijsaxx.220.0_63

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