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Article type: Cover
1996 Volume 61 Issue 486 Pages
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Published: August 30, 1996
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Article type: Cover
1996 Volume 61 Issue 486 Pages
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Published: August 30, 1996
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Article type: Appendix
1996 Volume 61 Issue 486 Pages
App32-
Published: August 30, 1996
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Article type: Index
1996 Volume 61 Issue 486 Pages
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Article type: Appendix
1996 Volume 61 Issue 486 Pages
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Article type: Appendix
1996 Volume 61 Issue 486 Pages
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Published: August 30, 1996
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Article type: Appendix
1996 Volume 61 Issue 486 Pages
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Published: August 30, 1996
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Akio BABA, Akiko MORI
Article type: Article
1996 Volume 61 Issue 486 Pages
1-8
Published: August 30, 1996
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Rexural strength and its determining factors of advanced fiber reinforced cementitious materials produced by extrusion moulding are experimentally examined. Densifying mechanism is specially focused under extrusion moulding production in case of using new types of high strength fibers. Density was observed to be much related to flexural strength and independent of mechanical properties of fibers. The way to densify this type of materials under production is clarified to be fundamental for producing strong cementitious materials by extrusion moulding. It is also verified that total void ratio including water content to cement is effective for predicting the flexural strength of extruded cement mortar with fibers.
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Kaname SUZUKI
Article type: Article
1996 Volume 61 Issue 486 Pages
9-14
Published: August 30, 1996
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In general, statics has been used for analyzing a fracture. The author has described thermodynamic analyses of a non-1inear fracture phenomenon, but different points of a static analysis and a thermodynamic analysis have never been examined. First, the phenomenon of a non-linear fracture is analyzed with statics and thermodynamics in this report. Secondly, the results of a thermodynamic analysis are compared with the results of a static analysis. Thirdly, the difference of the results becomes made to clear. The conclusions are as follows. (1) It is possible to analyze thermodynamic stable situations with statics, but impossible to do unstable situations with statics. (2) The results of a thermodynamic analysis do not deny the results of a static analysis. (3) Even if the results of a static analysis and a thermodynamic analysis coexist, it is not irrational. (4) Limitation of static analysis is caused by the laws of composing statics and thermodynamics.
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Tatsuhito KOMIYAMA, Yasuo TANIGAWA
Article type: Article
1996 Volume 61 Issue 486 Pages
15-22
Published: August 30, 1996
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The thermographic survey using thermal imager is considered to be a method detecting the surface temperature differences between the delaminated area and the sound area of finishing materials on building walls. So, there exist some analytical studies using heat balance simulation on this method. However the numerical results obtained by a heat balance simulation can not always represent the easiness of judgement. In this study, the availability and problems of the simulated thermal images using finite element method with smoothing technique are discussed by comparing with the thermal images of test specimens.
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Tatsuo OKAJIMA, Masaki MUTO, Shinji KAWABE
Article type: Article
1996 Volume 61 Issue 486 Pages
23-28
Published: August 30, 1996
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Today, it is an urgent necessity to improve on construction work. In the housing construction, it will not too long before new foundation method with pre-fabricated members is put into practical use. To estimate working time from execution quantity helps us to evaluate the productivity of new foundation method. In this report, the process of the foundation work at site with precast concrete members for detached housing was analyzed. The result of time study shows the standard working time can be determined by three factors: the weight of reinfocement, the volume of concrete cast in site, the net weight of precast concrete members.
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Yuji TAKEDA, Masaki MUTO, Tatsuo OKAJIMA
Article type: Article
1996 Volume 61 Issue 486 Pages
29-36
Published: August 30, 1996
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The purpose of this paper is to clarify the relation between image of dot-patterns and the eranhical properties of them. Firstly, 41 kinds of dot-patterns are made by CG for specimens. Secondly, 6 fundamental factors are chosen for evaluating image of dot-patterns. And the psychological values of the specimens are measured with respect to 6 image factors. By multiple regression analysis method, we found that the psychological values of dot-pattern image are closely related with the graphical properties of them.
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Ryoichi NAGAI
Article type: Article
1996 Volume 61 Issue 486 Pages
37-42
Published: August 30, 1996
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Newmark explained the theory of errors in the Newmark method in the case of free vibrations that the errors were caused by the difference between the differential eauation in actual vibrations and the difference equation in numerical analyses of vibrations. In the present study the above theory of errors is applied to the analyses of dynamic responses to earthquake excitations. The result shows that the dynamic responses of theoretical numerical analyses for parameter β=O reoresent the actual phenomena with small error, while the error is larger when the value of β is larger. If the value of β except 0 is wanted to use, the time interval must be very small. The present theoretical analyses and the result of numerical analyses exhibit good agreement.
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Yuuji SHIMOHIRA, Kunio YAMAGATA, Atsushi ITO, Daisuke MUTSURO
Article type: Article
1996 Volume 61 Issue 486 Pages
43-51
Published: August 30, 1996
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Laboratory model tests on Dynamic Consolidation Method in a loose sand was carried out to investigate the impact load - settlement characteristics. The main conclusions are summarized as follows. (1) The dynamic settlement characteristics of the ground are shown in the impact load-settlement curve. (2) The maximum impact load is proportional to the impact velocity at the first blow. But when blow is repeated, the maximum impact load increases in spite of a fixed impact velocity. (3) The maximum impact load is equivalent to the maximum pre-load in the static loading test. (4) The soil improvement effect is governed by the maximum impact load and the number of blows.
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Shiro KATO, Minoru IIDA
Article type: Article
1996 Volume 61 Issue 486 Pages
53-62
Published: August 30, 1996
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The present paper discusses an estimation procedure for the elasto-plastic buckling loads of the cylindrical shell roofs under non-uniform loadings and with geometrical imperfections. Firstly, the method to find the target member which is considered as the most important one to estimate the elasto-plastic buckling loads, is proposed. Then, the elasto-plastic buckling loads are plotted on the plane with two axes;one is the ordinate normalized by the axial force at elasto-plastic buckling load and the other is the abcissa generalized as slenderness ratio of the target member. Consequently. it is confirmed that the elasto-plastic buckling loads under non-uniform loading can be effective1y estimated by use of the column buckling axial force curve in terms of the generalized slenderness ratio.
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Shigeru MOCHIZUKI, Takashi KOBAYASHI
Article type: Article
1996 Volume 61 Issue 486 Pages
63-73
Published: August 30, 1996
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A multi-story shear wall has often discrete joints without cotter reinforcements at the vertical joints between the wall panels and the surrounding cast-in-place columns. The sliding displacement in joints which display a resistance mechanism different from that of cast-in-place shear wall is expected to occur. In order to investigate the effect of resistant of joints on earthquake resistant performance, a shear failure type experiment was performed on seven multi-story precast concrete walls having a variety of cotter and joint reinforcement ratio at joints. Based on the results of this experiment, the resistance mechanism of a precast concrete multi-story shear wall and a design formula of the slip strength of horizontal joints are proposed.
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Manabu YOSHIMURA, Kazunori IWABUCHI
Article type: Article
1996 Volume 61 Issue 486 Pages
75-84
Published: August 30, 1996
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A very new RC building with soft first story was collapsed by the 1995 Hyogoken-Nanbu earthquake. The nonlinear earthquake response analysis, where strength deterioration was considered in representing member nonlinearity, was conducted to simulate how the building behaved and eventually collapsed during the earthquake. The analysis was found to fairly well simulate the observed damage including residual displacement. It was also revealed that if the first story mechanism might occur, the collapse could be unavoidable even for the building with base shear strength as much as 60% of the total weight.
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Hideyuki KIMNUGASA, Setsuro NOMURA
Article type: Article
1996 Volume 61 Issue 486 Pages
85-94
Published: August 30, 1996
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A performance check method of earthquakeproof is proposed, based on the concent of energy balance between input energy and absorbed energy. The feature of this study is to be able to consider the rapidity of energy input by introducing the idea of "Energy Input Velocity". In this study, the destructive power of an earthquake is expressed by the quantity of the input energy and its input velocity. The seismic capacity of a building is expressed by the quantity of energy that can be absorbed within the continuation time of an earthquake on condition that the deformation is limited to the design maximum deformation. This is calculated by considering the balance between energy input velocity of the earthquake and energy absorption velocity of the building. Comparing this with the quantity of input energy caused by ground motion, the seismic safety is judged.
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Yuping SUN, Kenji SAKINO, Tomokazu YOSHIOKA
Article type: Article
1996 Volume 61 Issue 486 Pages
95-106
Published: August 30, 1996
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A comparative study of stress-strain curve models for confined concrete proposed by authors and other researchers is conducted at the first phase of the investigation described in this paper. Five models are applied to predict the results of specimens, which were tested under concentric axial load only, as well as under combined axial load and bending moment without moment gradient. It is concluded that the authors' model predicts test results better than the other models studied. The proposed stress-strain curve model is applied to predict the flexural behavior of the plastic hinge regions of the columns under axial load and bending moment with moment gradient (shear) at the second phase of the investigation. The emphasis is placed on estimation of the flexural strength of columns made of high-strength concrete. A semi-empirical formula to estimate the flexural strength of concrete columns is proposed from the viewpoint of practical design.
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Toshiro SUZUKI, Shojiro MOTOYUKI, Takashi FUKASAWA, Mizuaki UCHIKOSHI
Article type: Article
1996 Volume 61 Issue 486 Pages
107-114
Published: August 30, 1996
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In earthquake resistant design, strength and deformation capacity of beams is estimated by local buckling of the flange plate in comoressive side. However, many experimental reports represent that, in case of beams having scallops, brittle fracture is preceded to local buckling. In this study, we aim to grasp the effect of width-thickness ratio on deformation capacity of beams with scallops by bending tests. Moreover, it is referred that the range of the width-thickness ratio to which the deformation capacity decreases by applying the scallop is referred.
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Toshiro SUZUKI, Toshiyuki OGAWA, Kikuo IKARASHI, まなぶ おばた
Article type: Article
1996 Volume 61 Issue 486 Pages
115-123
Published: August 30, 1996
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This paper describes the plastic deformation capacity of beams which are fabricated from high strength steel with low yield ratio, or high yield ratio. And collapse forms of beams with stocky flange plate are shown by experiments and numerical analysis. These collapse forms are the lateral buckling and the ductile fracture of the tensile flange. The deformation behavior of beams is not influenced by the yield ratio when beams are collapsed by the lateral buckling. Finally, the plastic deformation capacity of considering the ductile fracture of the tensile flange is shown by the flange width-thickness ratio and the moment gradient.
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Tadao NAKAGOMI, Susumu MINAMI, Takashi FUKASAWA, Satoru ARAI, Kyoko OH ...
Article type: Article
1996 Volume 61 Issue 486 Pages
125-132
Published: August 30, 1996
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The present paper aims to clarify effect of column axial force on possibility of brittle fracture of the beam to column welded joint quantitatively by using the local fracture criteria. In respect to steel plates consisting the joint, stress state of brittle fracture is also clarified in this paper. As the result, consequently, it is comorehended that column axial force, crack length, or position of crack initiation much influences possibility of brittle fracture of the joint. Specially, effect of column axial force is considered to be large when tensile force applies the column.
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Chiaki MATSUL, Akihiko KAWANO, Chih-shu LEE
Article type: Article
1996 Volume 61 Issue 486 Pages
133-142
Published: August 30, 1996
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The beam-to-column connection system using outside-diaphragms, which stiffen the tubular columns from outside of the columns, does not reauire the cutting of columns at any level of beam flanges. This leads to the advantages of short welding lengths, high reliabilities on column strengths and on filling concrete into the columns. However, the connections usually need large sizes of horizontal dimensions, which cause some restrictions to the design on exteriors of buildings. A compact connection system using vertical stiffeners was proposed for the connections placed close to the building exteriors. The paper discusses the experimental results on the connection system, derives the strength formula, and illustrates the aseismic performance of framed structures consisting of the system.
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Toshiro SUZUKI, Shojiro MOTOYUI, Hidehiko OHTA
Article type: Article
1996 Volume 61 Issue 486 Pages
143-151
Published: August 30, 1996
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Concrete filled steel tubular column has a large deformation capacity according to the effect of filled concrete preventing the buckling of steel tube wall. However, it has not been clear the mechanism of interaction between steel tube and filled concrete. In this paper, with resnect to the buckling and post-buckling of steel tube, the behavior of concrete filled steel tubular columns under pure axial compression are evaluated on the stub column tests and finite element analysis. Load-displacement curve of concrete filled steel tube are predicted on the basis of analytical results.
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Tetsuo TAMURA, Yoshiaki ITOH
Article type: Article
1996 Volume 61 Issue 486 Pages
153-162
Published: August 30, 1996
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The patterns of the periodic vortex-shedding in the wake flows of bluff cylinders are sensitively affected by the shape of afterbody of the cylinder. Sometimes the Strouhal numbers afe jumped due to the variation of the depth/breadth ratio of the bluff cylinder. Here the separated flow around a bluff cylinder with various sectional shapes is solved by the finite difference technique of the incompressible Navier-Stokes equations. The mechanism of the unstable and drastic changes in vortex-shedding is investigated, through the comoarison between the experimental and computational data. We also bring into focus the behaviors of the separated shear layers from the cylinder and their following vortex formation process in the near wake.
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Article type: Appendix
1996 Volume 61 Issue 486 Pages
App36-
Published: August 30, 1996
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Article type: Cover
1996 Volume 61 Issue 486 Pages
Cover24-
Published: August 30, 1996
Released on J-STAGE: January 31, 2017
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