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原稿種別: 表紙
2004 年 69 巻 576 号 p.
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原稿種別: 表紙
2004 年 69 巻 576 号 p.
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原稿種別: 付録等
2004 年 69 巻 576 号 p.
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原稿種別: 付録等
2004 年 69 巻 576 号 p.
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原稿種別: 付録等
2004 年 69 巻 576 号 p.
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原稿種別: 付録等
2004 年 69 巻 576 号 p.
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原稿種別: 付録等
2004 年 69 巻 576 号 p.
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宮野 和樹, 桝田 佳寛, 中村 成春
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2004 年 69 巻 576 号 p.
1-6
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The influence of quantity and shape of fine aggregate and flowability of cement paste on flowability of self-compacting mortar is investigated in this study. The coefficient of thickness of paste layer is introduced based on coefficient of fine aggregate's shape and grading, quantity of fine aggregate and solid content in fine aggregate. The coefficient of fine aggregate's shape and grading is introduced by projection circumference, projection area and grading of fine aggregate. Conclusively, the flowability of self-compacting mortar can be estimated by coefficient of thickness of paste layer and flowability of cement paste.
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清原 千鶴, 永松 静也, 佐藤 嘉昭, 三橋 博三
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2004 年 69 巻 576 号 p.
7-14
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For high-strength and high-fluidity concrete, the water-cement ratio and the volume fraction of aggregate is lower than conventional concrete. In order to clarify systematically the deformation of these concrete, it is necessary to consider the effect of the volume of constituents in concrete. In this study, the estimation formula of modulus of elasticity of concrete was derived on the basis of a two-phase composite material model through experiments on the compressive strength and secant modulus of cement paste and concrete specimen with a same water-cement ratio respectively. The following conclusions may be drawn : 1) the relationships between cement-water ratio and modulus of elasticity of cement paste and concrete specimen were expressed by comparatively simple equations. 2) the elastic modulus of cement paste can be explained as a function of the cement-water ratio, and that of aggregate as a function of its absorption. 3) the proposed equation is able to estimate the compressive secant modulus of both normal and high strength concrete.
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山本 佳城, 桝田 佳寛, 中村 成春
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2004 年 69 巻 576 号 p.
15-21
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Moisture conditions of concrete are a critical factor in the corrosion of reinforcement. In this study, various electrochemical measurements were conducted using reinforcement in concretes adjusted to various moisture contents to evaluate the corrosion tendencies of reinforcement, thereby investigating the effect of the moisture conditions of concrete deteriorated by carbonation and chloride ions on reinforcement corrosion. In the range of this study, the following were found; In the presence of chloride ions at 5.0kg/m^3, the corrosion rate of reinforcement with a relative moisture content between 20 and 50% rapidly increases as the moisture content of concrete increases. On the other hand, with a relative moisture content of 50% or more, while the increased moisture content accelerates anodic reaction rate, the corrosion rate tends to be suppressed by the reductions in the cathodic reaction rate.
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河上 浩司, 桝田 佳寛, 西本 好克, 蓮尾 孝一
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2004 年 69 巻 576 号 p.
23-29
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The strength developme.it and mechanical properties of high-strength concrete using va.ious kinds of binder were experimentally investigated. The range of strength was from 60MPa to 150MPa. Normal portland cement, low-heat portland cement, pre-mixed silica-fume low-heat portland cement, and post-mixed silica-fume low-heat portland cement were used as the binder. As the result, the following were confirmed. (1) When using the low-heat portland cement as base binder, properties of fresh concrete and strength development of structural concrete were influenced seriously by the temperatures of concrete and atmosphere. (2) In ultra high-strength concrete upper 150MPa class, the strength development of structural concrete under high temperature curing was higher than that of standard specimen.
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横山 裕, 田所 創史, 馬場 浩, 小野 英哲
原稿種別: 本文
2004 年 69 巻 576 号 p.
31-38
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The purpose of this study is to present an evaluation method for the state of stains by human nibbing on inner wall. First, using thirteen sample walls of various materials, the staining test was practiced by the typical staining motion. Next, a device for stains was developed. This.device could give the same load on the wall by the motion. Then, the device practiced the staining test ; it was obtained that the device could stick the same stain by the motion. Finally, the evaluation method composed of the device and the evaluation index established in the former paper was presented.
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洪 起
原稿種別: 本文
2004 年 69 巻 576 号 p.
39-46
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This paper shows the formulation of system reliability analysis of steel frames with multiple failure modes and presents a new analytical method in the evaluation of the occurrence probability of each failure mode and the load and resistance factors of the members in a certain failure mode under load combination consisting of dead, live, wind and earthquake loads, applying the advanced first order second moment method. The difference between the load and resistance factors of a member in formulating as system reliability problem and that in determining on probability-based limit design for a structural element is described with numerical examples and is compared with those by Monte Carlo simulation.
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北村 春幸, 宮内 洋二, 福島 順一, 深田 良雄, 森 伸之
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2004 年 69 巻 576 号 p.
47-54
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Japan Structural. Consultants Association (JSCA) developed a performance based design code (JSCA Code) where a seismic performance gradation system has been prepared. In JSCA Code, boundaries of performance grades are given by numerical thresholds of various technical parameters, which are summarized in "table of numerical threshold". Purpose of the study in this paper is to verify the practical feasibility of the "table of numerical threshold" in terms of choice of parameters and the definition of numerical boundaries of each parameter. Although all structural types are the subjects of JSCA Code, steel structures are chosen as subjects of this study. First, basic concepts of JSCA Code are summarized followed by introduction of numerical threshold for defining seismic performance grades. Then, the results of dynamic time history response analyses of model buildings of steel structures with and without dampers or seismic isolation systems, which are conducted for the level-2 seismic action in designing high-rise buildings, are shown and efficiency of "table of numerical threshold" is studied in the light of the results. Finally, a proposal of method to classify seismic performance grade with simple indexes based on the numerical threshold of selected parameters is shown.
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古橋 剛, 石丸 辰治
原稿種別: 本文
2004 年 69 巻 576 号 p.
55-62
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In this paper, an element of vibration system is introduced, that connects mass points and has kinetic energy proportional to the square of the relative velocity between the mass points. Utilizing this element has unique effects for response control. Especially, by controlling vibration modes, natural period of structure can be changed without changing its eigen vectors and participation vector of higher modes can be made 0.
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菊地 優, 田村 和夫, 上田 正生
原稿種別: 本文
2004 年 69 巻 576 号 p.
63-70
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The study of the steady-state vibration of a system under sinusoidal excitation can provide important insights into the more general dynamic response of structures. This paper presents the non-linear steady-state vibration of seismically-isolated structures with viscously-damped isolation systems. The study is conducted using a simple 2-DOF model with non-linear superstructure springs. The solution method for the steady-state vibration of the non-linear system is based on the work of Caughey", and expanded to seismically-isolated structures. The non-linear superstructure behavior is significantly different from that of a fixed-base structure. Consequently, some important aspects for design of seismically-isolated structures are highlighted.
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竹脇 出
原稿種別: 本文
2004 年 69 巻 576 号 p.
71-78
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A new critical excitation method is developed for a damped linear elastic structure supported by a sway-rocking system. The input energies to the sway-rocking model and to the super-structure only during an earthquake are introduced as a new measure of criticality. It is shown that the formulation of the earthquake input energy in the frequency domain is essential for solving the critical excitation problem and deriving bounds on the earthquake input energies. It is demonstrated that the analysis of the bounds on the input energies to the sway-rocking model and to the super-structure only is useful for understanding the ratio of the input energy to the super-structure to that to the total system in various soil conditions.
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崔 昌禹, 大森 博司, 佐々木 睦朗
原稿種別: 本文
2004 年 69 巻 576 号 p.
79-86
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Evolutionary Structural Optimization (ESO) method is one of the most powerful and promising techniques for pursuing the optimal structural form among the other methods as the homogenization design technique. Although it is easy to carry out the calculation of ESO, there have been remained some weak points in its evolutionary process, by which inefficiency of calculation is caused or unsatisfactory solutions are concluded. A new method named Extended ESO (XESO) method is proposed through the usage of the contour lines in order to remove such defects of the original ESO method as well as to enable the structures to not only be scraped off but also grow up toward the final optimal structures. In this paper, extension process of the XESO method toward that for 3-dimensional structures is explained and numerical examples are demonstrated so as to show the potential ability of the present method toward effective structural design tools.
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近藤 一夫
原稿種別: 本文
2004 年 69 巻 576 号 p.
87-94
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A new and effective hybrid stress plane beam-column finite element based on the Timoshenko's theory, which might be connected and/or supported with other structural elements, such as wall and spring elements, is presented. Using the well-known semi-inverse method, axial normal and shearing stress fields for the plane beam-column, which satisfy the point-wise equilibrium condition in the axial direction as well as the ones of the overall beam-column section, are prepared in the expression of resultant stresses. According to the standard hybrid stress finite element procedure shown in Refs. 1) and 2), a new plane beam-column finite element with the present stress fields is derived, and the availability and the applicability of the present approach are, with aid of several numerical tests, discussed and examined.
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打越 瑞昌, 加藤 史郎, 中澤 祥二, 向山 洋一
原稿種別: 本文
2004 年 69 巻 576 号 p.
95-102
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The objective of this paper is to study how the plasticity of the base structure influences the response of the 300-span dome with seismic isolation system when it is subjected to horizontal earthquakes, and to find out the optimum amount of damper, and if the simple prediction method based on the energy theory could be applied to this system. From the results of dynamic response analyses, it is confirmed that the response of the dome can be reduced independent of the plasticity of the base structure, and the optimum amount of damper is close to a common building having the whole weight of this system, and that the simple prediction method can be applied to this system.
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内山 学, 山田 聖志
原稿種別: 本文
2004 年 69 巻 576 号 p.
103-110
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In this paper the finite element procedure for analyzing complicated buckling behaviors of clamped spherical shells is developed. A mixed 9-node-shell element is successfully formulated by using interpolation functions for stress resultant vectors. Selected 52 experiments previously reported on the elastic buckling of clamped thin-walled shallow spherical shells under external pressure are compared with the present finite element analytical results. The measured geometric initial imperfections are installed in the finite element analytical procedure. The agreements between the numerical simulations and the experimental measurements are obtained in not only buckling loads but also large deflection characteristics.
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杉山 智昭, 松崎 育弘, 中野 克彦
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2004 年 69 巻 576 号 p.
111-118
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The aim of this paper is to estimate the structural performance (stiffness, capacity, failure modes and ductility) of the Reinforced Concrete (RC) frame with cast-in-place non-structural RC walls (sidewalls). This paper mainly describes the structural performance of the RC frame under the situation of which the column and the sidewall slide off vertically. A shear-loading test and a finite element analysis (2-D non-linear analysis) were conducted using one-story RC frame with non-structural walls (sidewalls). From the test and the analysis, the shear resistant mechanism of the RC frames was clarified. Further, the load-deformation relationship of the RC frame can be predicted by a evaluation method verified with the shear resistant mechanisms.
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松森 泰造, 小谷 俊介, 塩原 等, 壁谷澤 寿海
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2004 年 69 巻 576 号 p.
119-123
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In the final stage of a structural design, the response of a structure as designed under a given set of loads and forces must be compared with the performance objectives. In this paper, a simple static analysis procedure is proposed to estimate maximum structural and member response in the seismic design of reinforced concrete (R/C) frame structures. The distribution of story drifts and member ductility demands along the structural height was studied by comparing the results of nonlinear earthquake response analyses and static push-over analyses. The results of two push-over analyses could reasonably estimate the distribution of ductility demands during an earthquake if the story shear distribution in the push-over analyses were taken to be the sum and the difference of the first two modes.
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中野 清司, 田邊 恵三, 松崎 育弘, 和田 章, 坂田 弘安, 久保山 寛之, 杉山 智昭, 池澤 誠
原稿種別: 本文
2004 年 69 巻 576 号 p.
125-132
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This paper presents results of the experimental tests to certify the mechanical behaviors of the frame structures by precast-prestressed concrete with MILD-PRESS-JOINT. The purpose of this experiment is to obtain not only hysteresis characteristic but behavior of joint rotation also prestressing strand for compression beam-column and to establish damage-controlled design by them. The specimen is cruciform model of prototype frame with MILD-PRESS-JOINT. The beam and column members precast-prestressed concrete are connected by prestressing strand that go through the beam and column, and anchored at the end of beam. Specimens have following parameter, with or without corbel of column and strand arrangement. As the results of experiment, damages occur only at beam-column interface, also, residual deformation is very small, and deformation is concentrated at beam-column interface. A possibility of damage control design can be shown by using P/C MILD-PRESS-JOINT.
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春日 康博, 金子 洋文, 木村 秀樹, 藤谷 義信
原稿種別: 本文
2004 年 69 巻 576 号 p.
133-140
発行日: 2004/02/28
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When steel or RC connections are designed, these connections had to have a sufficient strength and stiffness so far. However, many response control structures are developed recently. It is mean that specific member and the control device absorb the seismic energy and main members are not damaged much. For the steel structures, semi-rigid connections as easy connections are studied by many researchers. This is expected that seismic energy is absorbed by the earlier yield of angle members and possibility that seismic response of steel frame are reduced. However many reports are only presented concerned with member test and plane frame analysis so far and these semi-rigid connections are not apply actual design yet. This paper present that ductile-type connection has a large plastic deformation capacity. Ordinary steel and low yield steel are used by angle connection.
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伊山 潤
原稿種別: 本文
2004 年 69 巻 576 号 p.
141-148
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Reinforced concrete floor slabs connected to transverse beams might be helpful for structural systems to endure earthquakes after complete collapse of longitudinal beams. This paper proposes mathematical models of the subsystem composed of floor slabs and transverse beams which bears torsional moment, in order to estimate elastic stiffness and displacement of the subsystem. Two mathematical models are introduced in the form of differential equations. One model neglects distorsion of beam sections and the other considers it. Comparing the solutions of the models with those of Finite Element Method, the latter model shows better agreement with FEM on the estimation of torsional stiffness and deformation.
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小山 雅人, 松山 智恵, 三宅 辰哉, 青木 博文
原稿種別: 本文
2004 年 69 巻 576 号 p.
149-156
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In low-rise steel frame houses, nonstructural walls have great anti-seismic efficiency while they are damaged earlier than structural members in seismic motions. Therefore the optimum anti-seismic efficiency (Aopt) strongly depends on anti-seismic efficiency and seismic damages of nonstructural members. In this paper, seismic fragility curve (SFC) of nonstructural members is set based on full scale shaking table tests. SFC of structural members is set based on the cumulative damage value. Aopt is estimated using these SFCs. As results, Aopt decreases to approximately 70-80% with anti-seismic efficiency of nonstructural members, but increases to approximately 120-150% when damages of nonstructural members are considered.
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塩屋 晋一, 吉松 幸一郎, 大隣 薫
原稿種別: 本文
2004 年 69 巻 576 号 p.
157-164
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An experimental investigation and a limit analysis were conducted to study the seismic behavior of steel encased reinforced concrete frame with wing walls and the way to evaluate the maximum shear force of the wing wall-beam in the frame and the displacement at the time. Eight steel encased reinforced concrete column-beam-wall assemblage specimens and a reinforced concrete specimen, were constructed with a 1/3.5 dimensional scale factor. All specimens were tested under inelastic reversal loading. Tests show that the part of wing walls along the boundary with beam of SRC specimen was completely crushed without shear failure of the column and the beam, and after then the beams were collapsed as flexural failure with plastic hinge around the end of the beam, being different from those of RC specimen. The three main parameters were clarified up which would influence to the position of plastic hinge at the beam with wing walls. The maximum shear force and the displacement of beam at that time, calculated by the way proposed in this paper, agreed fairly good with the experimental results.
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福元 敏之, 瀧 正哉
原稿種別: 本文
2004 年 69 巻 576 号 p.
165-172
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In this paper, analytical and experimental investigations are conducted on the tensile elasto-plastic behavior of local connections in concrete filled circular steel tube (CFT) column to wide flange beam connection using external diaphragm. This paper proposes a new analytical method for predicting the load-displacement relation of such local connections. The method is developed by modeling a part of tube wall with external diaphragm as a grid beam with a tetra-linear load-deformation relation. This research verifies the analytical model by comparison with experiment results of column-to-wide flange beam connections. The analytical results agree approximately with the experimental results up to a large deformation.
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藤本 効, 中込 忠男, 山田 丈富, 河村 繁, 橋本 篤秀
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2004 年 69 巻 576 号 p.
173-180
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The present paper deals with the strength of aluminum thin plate joints using tapping screw. In order to establish a formula of ultimate strength of this joints, loading tests are carried out with varying thickness of aluminum thin plate and tapping screw diameter. This study shows the following results through the above investigations, i) The pull out strength of the tapping screw driving the aluminum thin plate could be determined from the relationship of the tensile strength, thickness, out-of-plane stiffness of aluminum thin plate and the diameter of preset hole, ii) The strength of the single lap-joint which is affected by eccentric loading caused by distance between the axis of connected two aluminum plates could be determined from the relationship of the tensile strength of the aluminum and the thickness of connected two aluminum plates, when the material collapse of the tapping screw and the aluminum plate was not leaded.
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原稿種別: 目次
2004 年 69 巻 576 号 p.
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原稿種別: 表紙
2004 年 69 巻 576 号 p.
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原稿種別: 表紙
2004 年 69 巻 576 号 p.
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