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Volume 97
Displaying 1-9 of 9 articles from this issue
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Article type: Cover
1964 Volume 97 Pages Cover1-
Published: 1964
Released on J-STAGE: August 30, 2017
JOURNAL FREE ACCESSDownload PDF (34K) -
Article type: Cover
1964 Volume 97 Pages Cover2-
Published: 1964
Released on J-STAGE: August 30, 2017
JOURNAL FREE ACCESSDownload PDF (34K) -
Michio KOIKEArticle type: Article
1964 Volume 97 Pages 1-10
Published: 1964
Released on J-STAGE: August 30, 2017
JOURNAL FREE ACCESS -
YOSHIKATSU TSUBOIArticle type: Article
1964 Volume 97 Pages 11-19
Published: 1964
Released on J-STAGE: August 30, 2017
JOURNAL FREE ACCESSIt is known that the general solutions for elastic shallow spherical tnin shells without surface load can be expressed by means of the Kelvin function in terms of φ, stress function, and w, displacement normal to thesnell surface. In this paper some impotant points which are deficient in the existing theories are revised: physical meanigs of mathematical solutions are considered and the terms giving multi-valued displacements are excluded, membrane stress and rigid-body displacement terms in the antisymmetrical case (n=1 when w=w_n cosnθ) which can not be derived from the mathematical solutions, are added. Formulas for dending and membrane stresses and displacements are presented as complete solutions, and particular solutions for various loads and temperature distributions are tabulated. As specific applications, shallow sphericall shells for roof demes and large tracking antennae are discussed. In these examples equations for deciding the unknown constants are derived from boundary conditions in the form of matrix. They can readily be used in the design of the similar structures. In paragraphs 1 and 2, the fundamental equations of bending problem of shallow spherical shells without surface load (equilibrium and compatibility equations) are established. From paragraph 3 to 6, the general solutions are derived by means of the Kelvin function (her, bei, ker, kei), and the fundamental character of this function is discussed. Further, cosidering on the nature of the stresses and displacements resulted from the solution as well as on the rigid body displacements, complete form of the solutions is accompished. Particular solutions for various loads and temparature conditions are taculated in paragraph 7 and complete solutions for shells without surface load are formulated in paragraph 8, both for stresses and displacements. In and after paragraph 9 are the applications of the solutions to the actual structures. Paragraph 9 is the example of a shallow spherical shell subjected to exially symmetrical edge moment, and ressults from the shallow shell theory are compared with those from Hetenyi's approximate theory for non-shallow spherical shells. In peragraph 10 and 11, tne reinforced shallow spherical shell roof subjected to various loads and a temperature distribution under several kinds of supporting conditions is discussed. Paragraph 12 is the example of a large antenna, the outer edge free and the inner edge clamped, under the following load conditions: a. own weight in two standing states, vertical and horizontal to the ground. b. various wind loads. c. axially symmetrical and antisymmetrical distributions of temperature increment.View full abstractDownload PDF (810K) -
AN ANALYSIS OF THE STATICALLY INDETERNINATE SPACE TRUSSED FLAT PLATE BY DIFFERENCE EQUATION, PART. 2HIROSHI KITAMURAArticle type: Article
1964 Volume 97 Pages 20-27
Published: 1964
Released on J-STAGE: August 30, 2017
JOURNAL FREE ACCESSIn the previous report, an analysis has been made to the gridworks by the application of difference equation. This time it is intented to analyze the statically indeterminate space trussed flat plate by difference method. In discussing the solution of plate, it is of adventage to find out the equations of deformation, in the from of series from the equations of equilibrium and the method of elastic weights regarding plane warren-type trusses. By transforming the corresponding equations, we may obtain difference equations which show the relations between the deformations and loads. Then, in discussing the problem in contrast with gridworks which have been referred to in the previous report, the relations between deformation and load of grid truss are derived in difference forms. Now before we go into any further, let us explain the chraactor of the space trussed flat plate, the upper and the lower chords of which meet at right angles one another at regular intervals in plane projection and by tying up the points of these intersections diagonally with lattice members, it would from space trussed flat plate mentioned. For the solution of the problem, we first choose the stress of each chord on these space trusses of isotropy as unknown quantities, and eliminate the stress of lattice members which are derived from the conditions of equibrium at each point, and obtain force equilibrium in form of difference equations, by which the relations between the stress of chords chosen and arbitrary loads at each points are shown. These equations can be also obtained by modifying coefficients referred to in the previous report of the statically determinate space truss shell in such manner as may be applicable to plate. Then, the equations of deformtions are introduced by applying the method of elastic weights horizontally at each point and the relations between each chord are expressed in form of difference equation. By transformations of the former equations and force equilibrium referred to in the preceding paragraph, the relations between stress of each chord and arditrary loads in upper chords are derived in difference forms. In addition to the exact solution we abtained by the methods already mentioned, an approximate method is devised neglecting shearing deformation. Also the relations between deflection and stress of each chord are derived in form of difference equations through the application of three dimensional method used in plane warren-type truss. Using some examples, difference equations so obtained are analyzed with respect to various boundary conditions by the solution of linear equations. As the results of analysis, the values obtained by the exact solution and the approximate method are compared, and the approximate method so devised was proved to de useful. The differences of gridworks and space trussess are easily comparable by the values of axis forces in the plane of space trusses. Some of the equations of deformtion and load among a group of difference equations have similar from, and the difference equations of gridworks and space trusses are compared with the differential equations of plate. Until quite recently, it has been believed to be a puzzling problem to solve the space trussed plate of the statically indeterminate structure of high order, but by the analysis and calculations of the difference equations so derived by the method already mentioned, the values of stress and deformation can be readily obtained in solving plate problem.View full abstractDownload PDF (968K) -
MINORU MAKINOArticle type: Article
1964 Volume 97 Pages 28-33
Published: 1964
Released on J-STAGE: August 30, 2017
JOURNAL FREE ACCESSThe deformation of wide flange sections subjected to a normal compressive force and bending moments in the elasto plastic range is studied with an assumption that the flange is concentrated in its gravity centre. An illustrative result obtained through a numerical integration by a computer is given in two charts, which may be correspond to the modified slope deflection coefficients. Then the effects of the cross sectional shape and of the yield strength in materials are discussed with those coefficients. Finally the design criterion of columns unrestricted to side sway is roughly estimated with elasto-plastic deformation characteristics and is compared with the AISC design formula for the plastic design. It may be found that there is afair coincidence between those criteria.View full abstractDownload PDF (592K) -
HIROSHI YAMAHARAArticle type: Article
1964 Volume 97 Pages 34-41
Published: 1964
Released on J-STAGE: August 30, 2017
JOURNAL FREE ACCESSOn the preceding report part-1, the principle of plugging effect and bearing mechanism of steel pipe pile was theoretically illustrated. As a serial instalment, several practical problems was discussed on this paper. Coefficients of friction between pile and soil and lateral pressure of soil which were unable to be known by the usual method of soil test, could be obtained by the experimental work with the original instruments. By the use of these factors obtained by the complementary test, the theoretical estimates of the ultimate bearing capacity of pipe piles were proved on good agreement with the observed practical field test data. A large size pipe piles driven to subgrade without enough depth of penetration cannot be expected to from a complete plug at the top of pile. Assume that a complete plug are always pproduced at the pile top, the estimates from past bearing capacity formulas are remarkably contradictory to actual value. This is very dangerous to planning of pipe pile foundation. By the theoretical mechanism described on this paper, it will enable to estimate the ultimate bearing capacity of pipe pile with practical accuracy.View full abstractDownload PDF (1090K) -
HIROAKI KIKUCHIArticle type: Article
1964 Volume 97 Pages 42-47
Published: 1964
Released on J-STAGE: August 30, 2017
JOURNAL FREE ACCESSThis is one of the reports of our continuous researches on the formation of agricultural settlement in Tokachi Farm area, concerning chiefly to the function of facilities, from the view point of daily behaviour of inhabitant. Generally speaking, the agricultural settlements in Hokkaido show a dispersed pattern based on the grid system. However, even in a such rural area, the spatial unit is rapidly shortening according to the development of communication. On the other hand, the time unit of our rhythmical daily lives will not so easily changeable as the spatial case. In this report, the outhor took up educational, medical, agricultural, shopping and recreational facilities, and studied the dailv behaviour of inhabitant, connecting with the time required for arriving at each facility from the dispersed dwellings. Farts of the results obtained are as follows: (1) Patterns indicated by the daily behaviour mentioned above may suggest the necessity of grading layout of facilities. (2) Through the data with respect to the rate of utilization of facilities which tends to decrease with increase of the time raquired for reaching to, an index for planning public service could be found. (3) In agricultural settlement, the inhabitant closely related and intimated with each facility is usually within the range of 30 minutes to arrive. (4) To reach the facilities for shopping, for attending a school or office and for medical treatment etc, the allowable time having an enough spare may be within 1 hour, either on foot or by train.View full abstractDownload PDF (1199K) -
Article type: Bibliography
1964 Volume 97 Pages 48-50
Published: 1964
Released on J-STAGE: August 30, 2017
JOURNAL FREE ACCESSDownload PDF (233K)
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