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Article type: Cover
1991Volume 429 Pages
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Published: November 30, 1991
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Article type: Cover
1991Volume 429 Pages
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Published: November 30, 1991
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Article type: Appendix
1991Volume 429 Pages
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Article type: Index
1991Volume 429 Pages
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Article type: Appendix
1991Volume 429 Pages
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Article type: Appendix
1991Volume 429 Pages
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Hidenori ONO, Takamasa MIKAMI, Yutaka YOKOYAMA, Masaharu SASAKI, Mayum ...
Article type: Article
1991Volume 429 Pages
1-8
Published: November 30, 1991
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The purpose of this paper is to present a method for evaluating floors from a viewpoint of pain caused by pressing human body on floors. First, we made psychological scales on pain by means of a sensory test. Next, we considered relationships between the scales and several physical quantities on floor hardness and roughness, which were measured by our original measuring devices. Finally, we presented the suitable physical quantity (PI) which corresponded well to the psycholigical scales, with its measuring method and relative evaluation indexes, as the evaluation method of floors from a viewpoint of pain. PI is composed of three basic quantities, that is, the relative displacement (δ), penetration depth (D), and the scratch force (G) of floors.
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Shinji KAWABE, Tatsuo OKAJIMA, Hiroshi NACHI
Article type: Article
1991Volume 429 Pages
9-15
Published: November 30, 1991
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The purpose of this study is to grasp the characteristic of stress relaxation of dried concrete for short time at high temperature. The stress of relaxation of concrete was measured for five hours at the constant temperature of 20℃, 60℃, 100℃, 120℃, 135℃ and 175℃. The initial strain levels were determined as the instantaneous strain due to the stress of 1/6, 2/6 and 3/6 of compressive strength. The conclusion is the following ; The relaxation of concrete for five hours does not increase in proportion to initial stress level. The relaxation of concrete at an arbitral temperature between 20℃ and 175℃ can be obtained by using "Time Temperature Equivalence Principle".
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Kuniyuki TOMATSURI
Article type: Article
1991Volume 429 Pages
17-29
Published: November 30, 1991
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Strength control method for high strength concrete, should be different from one for ordinary low strength concrete, because strength of high strength concrete grows for longer time, at least till 3300°D・D of maturity due to its high impearmiability. As strength standard deviation varies on its strength growth, only strength gain should not be considered but increasing value of standard deviation should be adopted. Strength control method based on maturity is suitable for high strength concrete, and inspection on ready mixed concrete at construction site should be main for strength control. As far as maturity is concerned, our country is classified in four areas, Sapporo, Sendai : Niigata, western Honsyu of Tokyo, and Naha.
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Minehiro NISHIYAMA, Fumio WATANABE, Hiroshi MUGURUMA
Article type: Article
1991Volume 429 Pages
31-40
Published: November 30, 1991
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Three prestressed and one reinforced concrete beam-external column joint assemblages were constructed and tested. The prestressing forces in the beams were 0.06, 0.12, 0.18 and 0.0 f'_cA_g, respectively. For the reinforced concrete assemblage, the subsequent reduction in stiffness and strength was observed due to damage concentrating in the joint core and bond deterioration of non-prestressed reinforcement, while the assemblage with a prestressing force of 0.06 f'_cA_g, was able to be loaded to beyond a beam rotation angle of 1/15 without reduction in stiffness and strength. The cover concrete of the beams in the test units with larger prestress spalled in the early stage of loading and the buckling of the beam longitudinal reinforcement resulted in reduction of strength and failure.
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Hiroshi MUGURUMA, Seiichi WATANABE
Article type: Article
1991Volume 429 Pages
41-47
Published: November 30, 1991
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For analysing the creep stress and creep deflection of statically indeterminate concrete frame structure, it is essential to derive the equivalent creep factors of constituent concrete members. In this study, assuming that creep strain consists of delayed elastic and flow strains, time-dependent deformation analysis had been carried out on the steel-concrete composit structural member subjected to combined axial and flexural sustained loads. From these analytical results equivalent axial and rotating creep factors were defined.
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Gengo MATSUI, Satoshi TANAKA
Article type: Article
1991Volume 429 Pages
49-54
Published: November 30, 1991
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This paper analyzes the effect of an opening in a shear wall to the shearing rigidity. For horizontal shear forces, shear walls are more effective than frames. The effect of an opening is significant in the sense of shearing rigidity. The solutions are derived from the analogy between the equations of the two dimentional elastic displacement and the deflection of a plate. The experiments are conducted by the Moire method. The experimental results are in good agreement with the analytical solutions.
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Noboru SAKAGUCHI
Article type: Article
1991Volume 429 Pages
55-64
Published: November 30, 1991
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Recently, mixed structural frame systems composed of reinforced concrete columns and steel beams have been used in the construction of buildings. However, the design method for beam-column joints of the mixed structural systems has not been established yet. In this paper, a new method to determine the shear force-deformation curves of the beam-column joint is proposed. The beam-column joint is assumed to consist of four kinds of elements, in which the stress-strain curve is idealized. Based on equilibrium of the shear force carried by the elements and the deformation compatibility, the shear force-deformation curves of the joint can be determined. The results of the calculation showed a good agreement with the test results.
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Shigeru FUJII, Shiro MORITA, Syuji KAWAKAMI, Toshiaki YAMADA
Article type: Article
1991Volume 429 Pages
65-75
Published: November 30, 1991
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An equation is developed for calculating strength of 90-degree hooked bar anchorage. The equation is derived from the analysis of authors' test results. It reflects the effects of six factors ; (1) concrete strength, (2) geometrical detailings of hook (radius of bend and the length of tail extension), (3) side cover thickness and spacings of anchored bars, (4) geometrical location and direction of the bend, (5) the projected development length and (6) confinement of transverse reinforcement on the anchorage strength. The proposed equation was compared with other proposals, and was verified from the applications to many previous test data. From this comparative study the authors' proposal gives the best prediction.
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Hidekazu NISHIZAWA, Tomihisa UCHITA, Kiyoshi KANETA
Article type: Article
1991Volume 429 Pages
77-88
Published: November 30, 1991
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This paper describes a new technique for ON-LINE simulation system for solving a dynamic response of a single story three dimensional frame subjected to a bi-directional ground motion. The system of which is composed of three actuators and a DDA simulator. The accuracy of the proposed technique was examined through ON-LINE expriments of steel elastic frames with and without eccentricity.
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Hiroshi KITAGAWA, Kazuhito MISAJI, Koichi SHIBATA
Article type: Article
1991Volume 429 Pages
89-100
Published: November 30, 1991
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The purpose of these studies is to introduce a value D_ηаertaining to damping characteristics and ductility of metal silos from analytical response for many earthquakes. We treated the analytical models contained both the characteristics of natural period before buckling and the ratio of degradation of stiffness after buckling, by using experimental result. As a result of the studies, the following items have been made clear for D_η, 1) Influences of many kinds of earthquake, 2) Influences of natural period, 3) Influences of viscous damping, 4) Influences of degradation of stiffness.
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Akira SUGINOME, Satoru INO, Masayoshi ITO
Article type: Article
1991Volume 429 Pages
101-110
Published: November 30, 1991
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We herein report on our recent survey of the floors of a six-story r/c public office building to result in structural and material engineering data including its floor behavior, slab concrete properties, amounts of live loads and the degree of dimensional accuracy examined on the majority of its floor elements.' Those data are intended to be supplementary to basic reference materials still excessively undersupplied in general for further renovation of existent design and construction methods and, in particular, for improved deflection control of domestic types of r/c floor systems. In a related context, additionally we test practical utility of the deflection calculation method recently suggested in the Japanese r/c design code (i.e. Standard for Structural Calculation of R/C Structures) in comparison of current measurements of long-time floor sagging with the corresponding calculations by the above method.
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Makoto TAKAYAMA, Hiroshi NAKAMURA, Shiro KATO
Article type: Article
1991Volume 429 Pages
111-124
Published: November 30, 1991
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To investigate carrying capacities of reinforced concrete (RC) shells, the experiments were performed to both nearly perfect RC cylindrical shell (CY-I-O) and RC cylindrical shell with artificial geometric initial imperfections of the three harmonic half waves in the circumferential direction (CY-I-8). These experimental results are compared with numerical ones, and the effects of initial imperfections are discussed. The experimental data indicate that the ultimate strength of CY-I-8 is much smaller than that of CY-I-O. The cracking patterns are different between CY-I-O and CY-I-8.
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Article type: Appendix
1991Volume 429 Pages
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Article type: Cover
1991Volume 429 Pages
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