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Article type: Cover
1980 Volume 296 Pages
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Published: October 30, 1980
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Article type: Cover
1980 Volume 296 Pages
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Published: October 30, 1980
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Article type: Index
1980 Volume 296 Pages
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Published: October 30, 1980
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Article type: Appendix
1980 Volume 296 Pages
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Published: October 30, 1980
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HARUO TAKIZAWA
Article type: Article
1980 Volume 296 Pages
1-7
Published: October 30, 1980
Released on J-STAGE: August 22, 2017
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The dynamic interaction of building-foundation-soil systems poses, even in a linear region, somewhat complicated problems beyond the conventional framework of structural dynamics. With a view to clarifying the fundamental structure of dynamic response for these linear systems, the current study is intended to present a series of mathematical examinations in a generalized form by applying the theory of the functions of complex variable. Specifically, priorities in the discussions done are given to such points as the physical interpretation of their nonelementary properties within the context of the classical theories for viscously damped systems. The initial phase, Part I, of this investigation includes a self-contained set of general formulations for the particular systems characterized by an entirely or piecewise rational function of complex frequency response. The entire rationality on the complex frequency plane permits a straightforward treatment, while certain implicit representations remain in formulating the instances of piecewise rational function. The latter clumsiness arises, in part, from the possible violation of the causality law; however, these cases are of a great practical importance as illustrated by the constant-Q (structural damping) modelling of material damping. In addition to an emphasis of the noncausal feature inherent in these systems, correspondence with the elementary algebraic eigensolution is also noted in this presentation.
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JUN SAKAMOTO, YOSHIRO KOHAMA, MASAO WATANABE, YUKIO OMIYA
Article type: Article
1980 Volume 296 Pages
9-17
Published: October 30, 1980
Released on J-STAGE: August 22, 2017
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This paper deals with probabilistic strength analysis of steel beams and columns. Analytical method is presented, using basics trength formulate of beam and column which are derived semi-theoretically and adopted as performance functions of beam and column strength. Yield stress of material, residual stress and initial out-of-straightness of steel member are treated as stochastic variables. Analytical expressions of probability density function of beam and column strength are represented. Analytical results are compared with ECCS and SSRC multiple column curves and experimental data of beams.
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KOZO WAKIYAMA, KEIJI HIRAI, KENJIRO HAMADA
Article type: Article
1980 Volume 296 Pages
19-26
Published: October 30, 1980
Released on J-STAGE: August 22, 2017
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The results of fatigue tests on high strength bolted tee connections are described herein. The type of test specimens is the most simple type of tee connections and two cut-tees are bolted together by two high strength bolts. Influential parameters on the fatigue strength are the thickness of the tee-section flange, the ratio b_0/a (a : the distance from the bolt line to the edge of flange, b_0 : the distance from the bolt line to the web line) and the initial clamping force of the high strength bolts. The specimens are six types and total numbers of specimens are sixty seven. The results are followings. The fatigue strength of tee connections is influenced by the prying force and the bending force resulting from deformation of tee-section flangesas same as the static strength. The static strength is not influenced by the initial clamping force but the fatigue strength is influenced of that very much. The decrease in the initial clamping force results in the decrease in the fatigue strength. Considering that the fatigue failure were caused in the high strength bolts in tee-connections, the fatigue strength is estimated by the bolt tension versus applied load relationship which have a stable condition after one loading cycle. And this relationship will be estimated from the static analysis. Consequently, if the fatigue failure is caused in the high strength bolt, the fatigue strength of tee-connections will be roughly estimated, and if the bending force in the high strength bolt is concidered, the fatigue strength will be estimated more accuratelly.
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YASUNAGA FUKUCHI, YASUO DOI, HIROSHI HOSOKAWA
Article type: Article
1980 Volume 296 Pages
27-36
Published: October 30, 1980
Released on J-STAGE: August 22, 2017
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On the economical viewpoint, such design method is frequently adopted to minimize the story height of buildings that holes are provided in web plates of beams for ducts or pipes to be passed through. In Japan, most of the shapes of the holes are circular. But, the method to calculate the strength of such beams is not established yet. In this paper, a method to calculate the strength of beams with non-reinforced circular web holes is proposed. The calculated results by the proposed method are compared with test results and it is assured that the proposed method can predict the strength of such beams. The summary concerning to the strength of such beams is as follows. 1) The shearing strength is about 85% of the full plastic shearing strength of the web net section area. 2) The bending strength is about 92% of the full plastic moment of its flange plates. 3) In case of a beam subjected to shearing force and bending moment simultaneously, its strength can be computed by a interaction curve of bending strength and shearing strength. 4) Because the shape of the interaction curve is neary rectangular, the bending strength and shearing strength can be checked independently, when a beam is subjected to shearing force and bending moment simultaneously in a practical design.
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ISAO MITANI, MINORU MAKINO, CHIAKI MATSUI
Article type: Article
1980 Volume 296 Pages
37-47
Published: October 30, 1980
Released on J-STAGE: August 22, 2017
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A theoretical analysis is performed on the post local buckling behavior of wide-flange beam-columns shown in Fig. 1(a). The analysis mainly based on the technique used in Ref. 10). However, the present analysis takes into account effects of plastic elongation in a local plastic hinge forming in the plate element, and effects of axial stresses in the plate element on specific power of dissipation of the local plastic hinge. The basic equation [Eq. (2)] is given by the principle of virtual velocities and principle of maximum specific power of dissipation. Among the Moment-Rotation curves based on the Eq. (2), the lowest result is valid, because of this analysis being based on the upper bound theorem. The analytical results are first compared with the test results shown in Ref 9). The second the effects of plastic elongation in the local plastic hinge and of axial stresses on a specific power of dissipatiou of the local plastic hinge are discussed. The results may be summarized as follows : 1. The experimental Moment-Rotation curves are well predicted by the analysis for the specimen with slender plates. 2. The Moment-Rotation curves under no consideration of the effects of plastic elongation in the local plastic hinge and of axial stresses in the plate element are lower in load carrying capacity than ones under the consideration of those effects.
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HARUYUKI NANBA, KATSUTOSHI SATO
Article type: Article
1980 Volume 296 Pages
49-56
Published: October 30, 1980
Released on J-STAGE: August 22, 2017
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Slabs in deeply buried structures, such as underground substatuions, are affected by external walls loaded by soil and hydrostatic pressure, furthermore, they must carry shearing forces to external walls under earthquake. For this reason, stresses in slabs take great values and so slabs under the ground are thicker than those above the ground. On making openings in such slabs, the effect of openings on the stress distribution in slabs must be taken into consideration. As stress concentration generally occurs near an opening, slabs with openings are reinforced there with steel bars. When they are subjected to shearing forces, stress distribution in them are predominantly affected by openings. In order to reinforce such slabs, we can employ the advantage of braces. In this paper, the effects of braces as reinforcement are examined by obtaining the stress distribution of a slab which has a square openin and is loaded on its inern boundary. This examination is based on the theory of two-dimensional problem in elasticity. Then the magnitude of the effect of a brace can be determined by the condition for compatibility of deformation at the end of the brace. And the theoretical solutions are examined by means of experimental analysis based on photo-elasticity. Through this study we find that it is considerably efficient to reinforce slabs with openings with braces but not. very efficient in comparison with braces in a frame.
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YOSHIZO DOBASHI, KOHYA SAKAJIRI
Article type: Article
1980 Volume 296 Pages
57-66
Published: October 30, 1980
Released on J-STAGE: August 22, 2017
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In the light of the writers' measurements on load-bearing behavior of variedly dimensioned reinforced concrete slab models with free edges, the modified Johansen method with the effect of concrete tensile strength taken into account and Park's method are examined herein respecting their validity in such cases of two-way slabs. In consequence, that of the former method, including its relative accuracy and feasible extent of application, is shown to be substantially limited because in the present cases the general mode of failure is more dominated by torsion and/or shear types than in the case of many otherwise supported slab systems subject to failures of generally bending types.
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YOSHIZO DOBASHI, MASAIKI UEDA
Article type: Article
1980 Volume 296 Pages
67-76
Published: October 30, 1980
Released on J-STAGE: August 22, 2017
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Material nonlinear analysis for reinforced concrete slabs with restrained edges is made using the finite element method with necessary formulations incorporated in it for the movement of their middle surface owing to cracking and other related effects, in both cases of taking and not taking account of compressive membrane actions. The results for the concerned load-bearing behaviors are compared with experimental measurements, with the adopted procedures shown to be valid to a resonable extent.
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KATSUKI TAKIGUCHI, MASAHIKO KIMURA, SEIJI KOKUSHO, KATSUMI KOBAYASHI
Article type: Article
1980 Volume 296 Pages
77-87
Published: October 30, 1980
Released on J-STAGE: August 22, 2017
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This is an experimental and analytical study about the bi-directional behavior of restoring force responding to relative displacement between the top and the bottom of a reinforced concrete column which is under constant axial force. A unique loading apparatus was developed for this experiment and it was described in detail in the previous paper (Part I, No.286). Twelve specimens were tested and valuable data were obtained. With respect to hysteretic energy absorption and restoring force, a column was compared with an ideal mechanical model under the same deflection history. The ideal mechanical model was designed using the analogy to the theory of elasticity and plasticity. From (hysteretic energy absorption ratio)-(accumulated plastic deformation) curve and (restoring force ratio)-(accumulated plastic deformation) envelope, the aseismic performance of the column was estimated. A bi-directional restoring force model was formulated using the concept of plastic potential and Ziegler's hardening rule. The test results could be explained by the model quite well.
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YOSHIROU KOBATAKE
Article type: Article
1980 Volume 296 Pages
89-97
Published: October 30, 1980
Released on J-STAGE: August 22, 2017
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In conjunction with structural design of cast-in-situ diaphragm R/C walls constructed in the underground along the periphery of the basements, biaxial bending-shear tests of R/C wall specimen were performed. The previous paper (Part 1) of this transactions No.285 describes the abstract of experiments and its results. This subsequent paper (Part 2) proposes a method of calculating the biaxial shear strength by taking into account only the neutral axis position to be obtained by the biaxial bending analysis, and examines its validity by comparing the shear strength and failure mode obtained by this method with the results of the tests of previous paper. The following facts can be said from the this study. (1) Shear strength of R/C wall under biaxial bending-shear may be estimated by the equation (2) at the neutral axis position at the yield point of the main reinforcement of the corner which sustains compression for the flexure perpendicular to the plane and tension for the flexure parallel to the plane. (2) Interaction curve for R/C wall under biaxial bending-shear may be appoximately obtained by combining the interaction curve for the biaxial shear based on the preceding point (1) and that for the biaxial flexure.
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KEIKO KODAMA, TAMAKO HAYASHI, TETSUO TOKUDA, MICHITAKA ISHIDA
Article type: Article
1980 Volume 296 Pages
99-109
Published: October 30, 1980
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SEIROKU OTA
Article type: Article
1980 Volume 296 Pages
111-116
Published: October 30, 1980
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I proved, Mr. Mayashi's thesis of Hachiman-zukuri has many important mistake in this theory.
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MASAJI HAMASHIMA
Article type: Article
1980 Volume 296 Pages
117-126
Published: October 30, 1980
Released on J-STAGE: August 22, 2017
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1. The width of the upper story is determined in proportion to the width of the lower story, but it is not standardized. 2. The proportion of the width As to the size of the upper story, the newer Taho-pagodas are generally larger than the older Taho-pagoda. As to the size of the upper eaves, the older Taho-pagodas are generally large, and the newer Taho-pagodas are small. 3. The proportion of the height The height of the upper roof is about tow thirds as high as the height of a Taho-pagoda, and in this point there is little differenee between the older Taho-phgodas and the newer ones. The height of the upper eaves is about a half as high as the height of a Taho-pagoda, and the height of lower eaver is about a quarter of that of the height of a Taho-pagoda. The tower eave's height of the older Taho-pagodas are expecially low, which showo that that they are are-one-storied pagoda with Mokoshi. 4. The proportion of the width and the height The newer Taho-pagodas are slenderer than the older ones. Which shows that thet styhe of Taho-pagodas has been modfied from one-storied pagodas with Mokashi to tow-storied pagodas.
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HIROYASU FUJIOKA
Article type: Article
1980 Volume 296 Pages
127-135
Published: October 30, 1980
Released on J-STAGE: August 22, 2017
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Reinforced concrete had just begun to be used in Tokyo municipal buildings when the Kanto Earthquake occurred. To reconstruct its buildings, Tokyo Municipal Office decided to introduce reinforced concrete widely. As a result, the fifteen years following the earthquake were the period of construction of a large number of reinforced concrete buildings. To carry out such a bug project, the members of the Architectural Section of Tokyo Municipal Office had been divided into branches specializing in specific architecture during that period. As is stated above, the time when the Kanto Earthquake occurred had great significance itself, and the reconstruction caused great changes in the system and the administration of the Architectural Section of Tokyo Municipal Office.
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NOBUHIRO SUZUKI
Article type: Article
1980 Volume 296 Pages
137-144
Published: October 30, 1980
Released on J-STAGE: August 22, 2017
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This study aims to clarify the structure of the water image-to clarify both the water image as a response to physical elements, and the relations between that image and those elements. The study also aims to ascertain the basic principles of the effective spatial organization of water spaces. The study is based on the following principles : 1. It seeks perceptual water characteristics as causes of the water image, and excludes cognitive ones. 2. It seeks manupulative physical elements which are usable in the architectural and urban design of water spaces. 128 water spaces were chosen as the subjects of the study, on the bases of their giving vivid water images to the author and having numerous, different characteristics. Of these, 5 water spaces were chosen as the primary subjects for attentive observation. They are Paley Partk, the Basin Fountain of the Generalife, Kibune River, Iidabashi Moat, and Poipu Beach. The author made a personal, systematic observation of these subjects as the basis of his study, with the giving of questionnaires to others as a secondary source. He also examined water images in 21 Japanese classic works of literature.
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Morihisa FUJIMOTO, Fukujiro FURUMURA, Takeo AVE, Yasuji SHINOHARA
Article type: Article
1980 Volume 296 Pages
145-157
Published: October 30, 1980
Released on J-STAGE: August 22, 2017
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Results of a primary creep study conducted on structural steel (SS 41) specimens in tension are presented. These specimens were subjected to various constant loads and high temperatures from 350 to 600℃ for 6 hours. Also presented is a mathematical expression, shown in a term of product of exponential functions with material constants. The expression is originally based on that developed by Nishihara and others, and modified by authors to suit more wide range of stress level and temperature. Besides, the stress-strain curves obtained together with creep curves are shown, and the correlation between creep strain and elastic-plastic strain is clarified by these curves.
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[in Japanese]
Article type: Article
1980 Volume 296 Pages
159-160
Published: October 30, 1980
Released on J-STAGE: August 22, 2017
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[in Japanese], [in Japanese]
Article type: Article
1980 Volume 296 Pages
161-162
Published: October 30, 1980
Released on J-STAGE: August 22, 2017
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