巻号一覧
5 巻 (1952)
- 4 号 p. 52-
- 3 号 p. 71-
- 2 号 p. 35-
- 1 号 p. 1-
前身誌
5 巻, 2 号
選択された号の論文の8件中1～8を表示しています
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島津 康男1952 年 5 巻 2 号 p. 35-44
発行日: 1952/06/15
公開日: 2010/03/11
ジャーナル フリーPropagation of elastic waves in a medium under finite compression or shear has been studied. The medium is assumed to be isotropic at the initial state. For the study, we use the theory of finite elastic strains proposed by F. D. Murnaghan. In this theory, the strains may be of any magnitude although they must be perfectly reversible and uniquely determined by the stresses.
Velocities of the waves are expressed in terms of the given compression or shear and of the elastic constants of the initially isotropic medium. On account of the apparent anisotropy, the waves propagated are polarized.
It is concluded that the effects of initial strains upon the propagation of the waves are small. The velocity change will be 1% at most by 0.5% of the linear compression or by 10′ of the shear.抄録全体を表示PDF形式でダウンロード (658K) -
細山 謙之輔1952 年 5 巻 2 号 p. 45-48
発行日: 1952/06/15
公開日: 2010/03/11
ジャーナル フリーSecular change of latitude was compared with those of some geophysical phenomena. It was found that there existed an intimate correlation between the secular displacement of the earth's mean pole and the change of height of mean sea levels of the Atlantic Ocean and Pacific Ocean.
On the other hand, the Chandlerian amplitude and period showed a parallel change with the amplitude of tidal variation of latitude.
In both cases a geoid pulsation may be postulated.抄録全体を表示PDF形式でダウンロード (377K) -
三木 晴男1952 年 5 巻 2 号 p. 49-54
発行日: 1952/06/15
公開日: 2010/03/11
ジャーナル フリー3) The viscosity coefficient is computed. The result is 10-2-10-1 poise in case of liquid core, 10-3 poise in case of gaseous core. Furthermore it is found that the temperature of the liquid core is in the neighbourhood of the critical temperature of the liquid core if the composing materisl is known, or, vice versa, we can know the rough composition if the temperature is known.
4) From the theory of visco-elasticity the attenuation coefficient of seismic wave is obtained using the result on the viscosity coefficient. The result agrees with our knowledges obtained from the observation of seismic waves.
5) The electric and thermal conductivities are obtained from the formulae of statistical mechanics. The results are as follows;
electric conductivity: 2-4×103ohm.-1cm.-1
thermal conductivity: 0.05-0.5cal.cm.-1sec.-1 deg.-1抄録全体を表示PDF形式でダウンロード (465K) -
久田 俊彦, 中川 恭次1952 年 5 巻 2 号 p. 55-62
発行日: 1952/06/15
公開日: 2010/03/11
ジャーナル フリーFrom the results of vibration tests on several masonry buildings, we have found the facts that the horizontal amplitude of any point along the vertical axis of such buildings shows a linear modal line, and its magnitude is remarkably affected by the horizontal shifting of the foundation and the rotation of the structure due to the deformation of soil. (cf. Fig. 1 and Fig. 2)
Taking these facts into consideration, we present an analytical theory which can explain vibrational features of masonry structure not only in elastic range but also in plastic. Considering the linearity of modal line, we assume in the theory that a masonry structure can be represented by a rigid model with horizontal and vertical springs at its bottom as shown in Fig. 3, where the actual deformability of the structure itself is considered to be amalgamated into the coefficient of the soil spring.
From theoretical calculations of forced, coupled vibration, we can see the nodal point always exists at a nearly fixed position when the frequency approaches to the fundamental resonance and, accordingly, we can treat the model as a rotating vibration system with one degree of freedom having its rotating center at the nodal point.
Using this simplification we can explain the behavours of large vibration whose resonance diagram shows a non-linear characteristic. (cf. Fig. 6).
While, in the present paper, the authors submit a theory of vibration of masonry structures excited by a vibrator as shown in Fig. 3 and prove the coincidence of theoretical results with the experiment, they also give some consideration to the acceleration which will take place in such structures when shaked by ground motion.
In the last part of this paper, there are listed some values of spring constants of soils or the coefficients of both subgrade reaction and subgrade shear reaction, which have been obtained from the test results on some actual masonry buildings.抄録全体を表示PDF形式でダウンロード (564K) -
松本 利松1952 年 5 巻 2 号 p. 63
発行日: 1952/06/15
公開日: 2010/03/11
ジャーナル フリーPDF形式でダウンロード (99K) -
浅田 敏, 鈴木 次郎1952 年 5 巻 2 号 p. 64-65
発行日: 1952/06/15
公開日: 2010/03/11
ジャーナル フリーPDF形式でダウンロード (162K) -
田 望1952 年 5 巻 2 号 p. 65-66
発行日: 1952/06/15
公開日: 2010/03/11
ジャーナル フリーPDF形式でダウンロード (180K) -
坪井 忠二, 小林 直太1952 年 5 巻 2 号 p. 66-67
発行日: 1952/06/15
公開日: 2010/03/11
ジャーナル フリーPDF形式でダウンロード (1635K)
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