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Article type: Cover
1993Volume 446 Pages
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Published: April 30, 1993
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Article type: Cover
1993Volume 446 Pages
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Article type: Appendix
1993Volume 446 Pages
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Article type: Appendix
1993Volume 446 Pages
_4_-_6_
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Article type: Index
1993Volume 446 Pages
Toc1-
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Article type: Index
1993Volume 446 Pages
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Masayuki TAKEMURA, Tomonori IKEURA, Katsuya TAKAHASHI, Hiroshi ISHIDA, ...
Article type: Article
1993Volume 446 Pages
1-11
Published: April 30, 1993
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Q-values and velocities for S-waves propagating in sedimentary layers on the basement are evaluated from spectral ratios strong motion records through an optimal analysis. The strong motion records are obtained by 4 borehole array observations with the depths from 100 to 950 m in Southern Tohoku and Kanto districts in Japan, and available frequencies for the analysis range from 0.5 to 20 Hz. The velocity V_s structures obtained in the present study are consistent with the results by the PS-logging at all the stations. The Q-values are increase with frequency f in proportion to f^<0.2-1.0> between 0.5 to 10 Hz.
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Jun SAKAMOTO, Mamoru KOHNO, Tetsuya ISHIKAWA
Article type: Article
1993Volume 446 Pages
13-22
Published: April 30, 1993
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The effects of wind forces are of primary importance in the design of tall buildings. Since dynamic wind forces have spatial amd temporal randomness and correlation, it is necessary to study the wind-induced response from statistical view point. This paper presents an efficient and practical method of simulating a set of stationary random processes with specified auto- and cross-spectral densities. The component processes are generated by the finite Fourier series with correlated random phase angles relevant to the coherence characteristics of wind forces. Also numerical examples of wind response analysis to the simmulated random processes are demonstrated.
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Ryoji IWASAKI
Article type: Article
1993Volume 446 Pages
23-29
Published: April 30, 1993
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It is well known that a narrow frequency band wave has a nature of some repeating waves but no particular approach has been reported to control the predominant time and the duration time for each repeating wave. In this study an analytical method to control these time characteristics of the envelope shape by pulse phases, which are computed by specified occurrence times of impulses waves, is proposed. Some simple cases demonstrate the relation between phase properties and the envelope shape of narrow frequency band waves. Finally some examples with various frequency ranges are shown to confirm the applicability of proposed method.
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Gengo MATSUI, Takayuki OKAMOTO
Article type: Article
1993Volume 446 Pages
31-40
Published: April 30, 1993
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In this paper, the arrangement of PS tendons around an opening of precast concrete panel construction is investigated by two dimentional elasticity. Assuming that the tendons are most effectively placed when they follow the directions of principal tension stresses, we determine these directions. When the opening is large, the anchoring of tendons at the boundary of opening cannot be avoided. The analytical solutions on such cases show that significant tension stresses occur near the opening to which attention need to paid. The results of our photo-elasticity experiments and F. E. M. calculations are in good agreement with the analytical solutions.
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Nobuyoshi TOSAKA, Akihide UTANI
Article type: Article
1993Volume 446 Pages
41-50
Published: April 30, 1993
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The purpose of this study is to propose a new approach based on the boundary element method in solving the inverse, problem of partial differential equations given as governing equations of the field. This approach is developed with a boundary element method in conjunction with the Kalman filter theory, especially the extended kalman filter theory which has effectively-used in fields of optimal control theory of dynamic system. The applicability of the method proposed herein, which we would like to call the kalman filter-boundary element method, is examined with identification problems of elastic constants in two-dimensional linear elastic fields.
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Motohide TADA, Akira SUITO
Article type: Article
1993Volume 446 Pages
51-56
Published: April 30, 1993
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In the dynamic analysis of the skeleton structures including truss members, masses have been generally considered only at the ends of the members. When the buckling takes place in the truss member whose slenderness ratio is near critical, this modeling cannot give a solution, because the member does not have the equilibrium path in the direction in which the deformation increases. This paper shows that the equilibrium path can be successfully obtained by considering the transverse inertia force of the members. The incremental perturbation method is applied to the numerical analysis in order to overcome the difficulty originated from the short natural period of the transverse vibration of the individual member
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Kunio YAMAGATA, Atsushi ITO, Ryuichiro OHNO, Yoshiyuki KURAMOTO
Article type: Article
1993Volume 446 Pages
57-65
Published: April 30, 1993
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In elucidating the behaviors of pile on cyclic loading test, calculation method of axial force was examined in due consideration of non-linearity and hysteresis of load-strain relations of concrete pile. In this paper the characteristics of the load-strain relations on loading test data of three precast concrete piles were indicated, and calculation method of the axial force based on strain data of pile in the ground was proposed by means of formulating the characteristics. Then on the basis of the calculated axial force distributions and settlement data, load-settlement properties under cyclic loading were considered.
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Koji TOMINAGA
Article type: Article
1993Volume 446 Pages
67-72
Published: April 30, 1993
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For the design of a pile foundation subjected to lateral load, the linear subgrade reaction method, which is commonly called Chang's. solution, is widely used in Japan. However, the solution is not applicable to soils, such as sand, where the stiffness increases approximately linearly with depth. In practice, the estimate of such subgrade reactions has not also published. This report presents the relationship between the coefficient of the horizontal subgrade reaction from the back analysis of twenty-eight full scale tests on a pile in sand and N-value measured by the standard penetration tests.
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Katsuyuki TAMAOKI, Yutaka KATSURA, Satoru KISHIDA
Article type: Article
1993Volume 446 Pages
73-80
Published: April 30, 1993
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A process for obtaining reliable Young's moduli of bearing soil strata (E) is discussed in this paper. The process is based on measurements of vertical strain (ε_υ) of bearing strata during excavation and building construction. E for settlement analyses must be determined based on the relation between E/E^´_0 and ε_υ during construction, where E^´_0 is the Young's modulus after excavation, which in turn is calculated from the Young's modulus E_0 from shear wave velocity before excavation. The relation between E/E^´_0 and ε_υ during excavation is not equal to the relation between E/E^´_0 and ε_υ in that E depends on both ε_υ, and stress level in the soil.
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Haruo KUNIEDA, Yoshihiro KOHNO
Article type: Article
1993Volume 446 Pages
81-88
Published: April 30, 1993
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An approximate expression of the bending solution of spherical shells in the vicinity of a boundary is derived in axi- and antisymmetric states, which makes easy to evaluate the stress disturbance due to boundary constraints in engineering practice and makes clear the influence of conical angles, radius-thickness ratio and loading type on it. This paper also provides explicit expression of the positions of zero value and extremum value of stresses and displacement components. These positions manifest the area of so-called edge zone, where stresses due to bending moments become dominant.
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Yoshihiro SUENAGA, Norimasa TAKAGI, Masaaki SAKUTA
Article type: Article
1993Volume 446 Pages
89-98
Published: April 30, 1993
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This study examines a predict method which first evaluates the changes in wave patterns, currents and other aspects of the physical marine environment, then attempts to clarify the impact these changes will have on biological production. The research described here focuses on identification and measurement of the input and output coefficients in the regional food chain necessary for quantitative analysis. A pond for aquaculture production was chosen as a target ecosystem, and continuous measurements were made of changes in weather, water quality and biomass. The report identifies the environmental factors which have the strongest impact on biological productivity, and utilizes these for quantitative analysis of the ecosystem.
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Fumio WATANABE, Minehiro NISHIYAMA, Hiroshi MUGURUMA
Article type: Article
1993Volume 446 Pages
99-106
Published: April 30, 1993
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Four test columns were constructed using concrete with compressive strength of 130 MPa, transverse reinforcement with yield strength of 408 or 873 MPa and ordinary longitudinal reinforcement. Those columns tested under reversed cyclic lateral loads with constant axial compressive load levels of 0.343 or 0.473. Test results indicated that even for such high strength concrete columns adequate ductility was secured by using high strength transverse reinforcement. Based on the. test results, the stress-strain model on confined concrete previously proposed by the authors was modified so as to be applicable not only to ordinary strength concrete but also to high strength concrete. It was also found that the flexural strength of such high strength concrete columns can be predicted by using ACI 318-89 stress block equation.
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Hisayuki OKADA, Atuhide HASHIMOTO, Mitumasa MIDORIKAWA
Article type: Article
1993Volume 446 Pages
107-116
Published: April 30, 1993
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The purpose of this paper is to investigate the compressive strength of steel-polymer-steel laminated sandwich plate, which can be influenced by the shearing behavior of the core polymer, According to analytical investigation, simplified equations are derived to estimate the buckling strength of laminated plates, of which 4 edges are simply supported, under compressive force on 2 edges. Then introducing of the newly proposed parameter on width-thickness ratio makes the estimation of the ultimate strength easy. These analytical results showed good agreement with experimental results.
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Nobuyuki YASUI, Kazuo INOUE
Article type: Article
1993Volume 446 Pages
117-126
Published: April 30, 1993
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In this paper, the rate relation between the axial load and the longitudinal deformation of axially compressed circular tubes is derived by using simple collapse mechanism and plastic theory. This mechanism is symmetrical shape that has three plastic hinge lines. Prager's hardening rule is used for the hinge lines and the plastic deformation areas. According to the theory proposed here, the maximum load and the strength inferiority after critical value can be analized. The results of this analysis are compared with the results of stub column tests.
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Koji MORITA, Masaru TERAOKA, Takahiko SUZUKI, Toshio FUJIWARA, Hisaaki ...
Article type: Article
1993Volume 446 Pages
127-136
Published: April 30, 1993
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Structural behaviors of the connections between concrete filled square tubular high strength (780N/mm^2) steel column and wide flange high strength (590N/mm^2) steel beam have been studied by cruciform tensile tests and beam-and-column subassemblage tests. Stable hysteretic loops of rich energy absorption capacity have been obtained showing good structural behaviors for seismic loading by beam-and column subassemblage tests. Yield and ultimate strengths of the connections have been analysed based on the yield line theory taking the strain behaviors of the connections into consideration. The analytical results agree well with test results.
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Yuji HASEMI, Masashi YOSHIDA, Takuya NAKABAYASHI
Article type: Article
1993Volume 446 Pages
137-145
Published: April 30, 1993
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Effectiveness of the use of noncombustible ceiling for the improvement of fire safety in a compartment with wooden wall is studied by full scale burn tests. It has been clarified that the use of noncombustible ceiling lead to notable delay of fire spread along lining surface, and that the criteria and the extent for lateral fire spread along wall surface, the possible cause for flashover can be evaluated by the estimation of heat flux to the wall surface from the smoke layer. For a given smoke layer temperature, the heat flux can be estimated using the total heat transfer coefficient, a=0.04kW/m^2K.
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Article type: Appendix
1993Volume 446 Pages
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Article type: Cover
1993Volume 446 Pages
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