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原稿種別: 表紙
2001 年 66 巻 548 号 p.
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発行日: 2001/10/30
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原稿種別: 表紙
2001 年 66 巻 548 号 p.
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発行日: 2001/10/30
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原稿種別: 付録等
2001 年 66 巻 548 号 p.
App61-
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原稿種別: 付録等
2001 年 66 巻 548 号 p.
App62-
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原稿種別: 付録等
2001 年 66 巻 548 号 p.
App63-
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原稿種別: 付録等
2001 年 66 巻 548 号 p.
App64-
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原稿種別: 付録等
2001 年 66 巻 548 号 p.
App65-
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依田 和久, 原田 実, 黒沼 出
原稿種別: 本文
2001 年 66 巻 548 号 p.
1-7
発行日: 2001/10/30
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Within-site recycle comprises the production of demolished concrete debris, production of concrete with the recycled aggregate and new construction with the recycled aggregate concrete. Feasibility of within-site recycled aggregate concrete was studied in terms of literature based cost, environmental emissions, method of recycled aggregate production and test application to leveling concrete. Within-site recycled aggregate production was able to reduce cost and environmental emissions, and the staged mixing recycled aggregate concrete showed excellent workability and performances necessary for a levelling concrete.
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田中 享二, 全 振煥, 名和 豊春, 橋田 浩
原稿種別: 本文
2001 年 66 巻 548 号 p.
9-14
発行日: 2001/10/30
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Mortar specimens cured at various conditions were first subjected to bending repeated loads, and it was made clear that insufficient cure reduced fatigue resistance of them. Next, fatigue tests that the stress levels are lower than the ones of fatigue rupture were carried out, and the improved scale based on the Gompertz curve was proposed for expressing fatigue of specimens. The effect of curing conditions in early age on carbonation was furthermore studied using the scale, and it was made clear that insufficient cure is also susceptible to their carbonation. Finally, the reason for rapid carbonation of fatigued mortars insufficiently cured was discussed from the view point of changes in pore structure of them.
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上田 宏, 羽倉 弘人, 濱田 裕史
原稿種別: 本文
2001 年 66 巻 548 号 p.
15-20
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Larger attached canopies are very sensitive to the influence of wind and actually often damaged by wind force considerably. The purpose of the present paper is to describe the characteristics of fluctuating wind pressure and fluctuating wind force acting on a large-scale canopy attached to low-rise buildings with a flat roof. It also describes the characteristics of aerodynamics center that is estimated, based upon fluctuating stress generated in cantilevers supporting a canopy roof. The results of the present paper can be summarized as follows : (1) The properties of the wind forces acting on the attached canopy are considerably influenced by the properties of wind pressure acting on the upper side of canopy. (2) The peak of mean wind force coefficient and the peak of minimum wind force coefficient of upward direction acting on the center of attached canopy roofs can be evaluated by the empirical parameter with h/H and w/l. (3) The aerodynamics center of the peak minimum wind force acting on the center of attached canopy located at the center or slightly toward the tip side of the canopy length, and the aerodynamics center can be evaluated by the empirical equation.
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趙 衍剛, 小野 徹郎
原稿種別: 本文
2001 年 66 巻 548 号 p.
21-26
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Moment methods have been developed to avoid the difficulties involved in searching the design point by iteration using the derivatives of the performance function, a principle shortcoming of reliability methods based on the first-order reliability method (FORM). In order to investigate the accuracy, efficiency and applicability of moment methods, in the present paper, several third- moment reliability indices are presented, investigated and compared. Through the investigations, a simple third- moment reliability index is suggested for moment methods. It is found that the third-moment reliability index has sufficient accuracy and it is convenient to be applied to structural reliability analysis.
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入江 康隆, 野俣 善則
原稿種別: 本文
2001 年 66 巻 548 号 p.
27-34
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The dynamic soil-structure interaction of two storied contemporary timber houses and a five storied R/C structure are investigated from the earthquake observations and microtremor measurements. Comparison is made on the elongation ratio of natural period and the damping effect between a five storied R/C structure and two storied timber houseses. The main results are as follows ; The elongation ratio of natural period of the soil-building system to the building system is about 30〜42% on a five storied R/C structure in case of microtremors and during earthquakes. On the other side, this is only about 3〜4% on two storied timber houseses, and becomes about 4〜6% during earthquakes. The damping effect is also large in case of a R/C structure than two storied timber houses. For the reasons stated above, the reduction of input motion to timber houses should be considered in case of structural design after ascertaining the soil-structure interaction effect from observation of many earthquake waves.
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林 康裕, 北原 昭男, 平山 貴之, 鈴木 祥之
原稿種別: 本文
2001 年 66 巻 548 号 p.
35-41
発行日: 2001/10/30
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In this paper, the peak ground velocity (PGV) distribution during the western Tottori earthquake of 2000 is evaluated based on the overturning ratio of tombstones. More than 80 cm/s of PGVs are estimated in the source region, which almost correspond to those near the most heavily damaged area in the Hyogo-ken Nanbu earthquake of 1995. Then, we demonstrate that the severe damage ratios of wooden houses are fairy small compared with those in Kobe earthquake. Finally, the effects of ground motion characteristics to the difference are studied based on earthquake response analyses using accelerograms during the two earthquakes.
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丹羽 直幹, 高橋 元一
原稿種別: 本文
2001 年 66 巻 548 号 p.
43-50
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Analytical model of a semi-active damper is proposed to present the dynamics of the damper. The model is verified by simulating the dynamic loading test results. Using this analytical model numerical analyses are carried out with simple structural model. Parameters are control gain, stiffness ratio and natural period of the structure. Through the numerical analyses the influence of the dynamics of the damper upon the structural response is studied. The influence of the controller gain variation is also confirmed. It is concluded that the analytical model can be used to precisely evaluate the control effect of the semi-active damper system and is useful for practical design of the actual dampers under applied conditions.
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兼光 知巳, 川口 衞, 三井 和男
原稿種別: 本文
2001 年 66 巻 548 号 p.
51-58
発行日: 2001/10/30
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Construction process plans of structures have an influence upon the cost and term of the construction. The construction process is often planned by trial and error on the basis of previous experiences. The work is very difficult and could not always give an optimal answer. Various difficulties that must be solved also increase when the structure becomes complex and the number of members increases. In this study, our objective is to search for the optimal construction process by a numerical analysis. Genetic Algorithms (GAs) are introduced into the problem of the construction process analysis. In this paper, the analysis simulates three construction plans of structures : construction process of truss domes, construction process of buildings with basements and welding process of steel buildings.
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藤井 大地, 鈴木 克幸, 大坪 英臣
原稿種別: 本文
2001 年 66 巻 548 号 p.
59-66
発行日: 2001/10/30
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The Convex Linearization method (CONLIN), that is a dual optimizer based on the convex approximation concepts, is often used to solve the structural optimization problem, recently. The CONLIN optimizer has many benefits, for example, the handling of constraint conditions is easy as well as the SLP method, and the performance of convergence is excellent as well as the optimality criteria method (OC). In this paper, the CONLIN optimizer is applied to the topology optimization problem of frame structures in order to investigate the performance of this optimizer in the topology optimization analysis. The ground structure method is used to obtain the optimum topology of frame structures. The characteristics of the CONLIN optimizer are clarified by comparing with the SLP method and OC method. Several examples are shown to demonstrate the effectiveness of the CONLIN optimizer for the topology optimization analysis.
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山田 有孝, 三浦 賢治
原稿種別: 本文
2001 年 66 巻 548 号 p.
67-72
発行日: 2001/10/30
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The previous paper described the earthquake response characteristics of composite foundation of wall and piles. The wall foundation is actually constructed by some separating panels and no structural fastener connects to each other. The split wall model is investigated by 3D FEM. It is found the split wall foundation shows the better performance to the severe earthquake than the uniform wall foundation. But the local stress exceeds elastic limit, the nonlinear analyses should be conducted in order to discuss the seismic performance of split wall foundation. The simplified beam model is constructed for split wall foundation, and demonstrates the elastic characteristics are comparable to the former rigorous model. The nonlinear characteristics of split walls and piles are evaluated by practical method; finally, the nonlinear step-by-step earthquake response analyses are carried out. The split walls located at flange position are subjected to large kinematic interaction force and large anti-plane bending moment is induced, but less than yield stress of re-bar. Also the large in-plane bending moment is generated at web position, but stress level is only the crack of concrete occurred.
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和田 昇三, 及川 裕章, 国府田 誠, 佐藤 秀人, 田村 昌仁
原稿種別: 本文
2001 年 66 巻 548 号 p.
73-80
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The objective of this study was to clarify the structural performance of different types of retaining walls. In this study, an experiment was conducted on the structural performance of the L-type retaining wall (L/H=0.6) and the lean-type gravity retaining wall with a gradient of 1:05 by applying varying uniformly distributed loads on the ground surface. This study has led to the following observations. (1) In the case of the L-type retaining wall (L/H=0.6), it is concluded that if the structural strength and the bearing capacity of the soil are high enough, the structural performance of the retaining wall is satisfactory until a uniformly distributed load equivalent to the weight of a layer of earth with a height about seven times that of the back-fill is applied on the ground surface. (2) In the case of the lean-type gravity retaining wall with a gradient of 1:05, it is concluded that if the structural strength and the bearing capacity of the soil are high enough, the structural performance of the retaining wall is satisfactory until a uniformly distributed load equivalent to the weight of a layer of earth with a height about 2.5 times that of the back-fill is placed on the ground surface.
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加藤 史郎, 中澤 祥二
原稿種別: 本文
2001 年 66 巻 548 号 p.
81-88
発行日: 2001/10/30
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The present paper discusses the earthquake response characteristics and seismic resistant capacity of single layer reticular domes supported by substructures composed of steel braces and columns, and proposes a design concept to reduce the responses of the dome by means of yielding of the braces. The investigation chiefly focuses on the relationship between the reduction of the dome responses and the yield shear coefficient of the substructure. From the results of the numerical analysis, it is confirmed that the responses of the dome subjected to horizontal earthquake motions are much reduced by means of yielding of the substructure.
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平坂 継臣
原稿種別: 本文
2001 年 66 巻 548 号 p.
89-94
発行日: 2001/10/30
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The Hanshin Earthquake inflicted big damages to many wooden buildings. The bad connection of column and bedsill has been indicated in one of the cause of increasing the damage. This paper reports on the results obtained experimentally on the resisting strength and deformation characteristics of tenon connection of precutting processing subjected to repeated lateral loading. The main results derived from the analysis of this experiment are as follows. In the modes of failure : The specimen of full tenon jointing and stub tenon jointing became loose due to the repeated-load, the specimen of cotter pin joint broke the root of tenon jointing, the wedge joint split from the cutting depth of the wedge, and the steel connector joint produced the tearing crack to the bedsill by the nail. The cotter pin joint and the steel connector joint are small extraction of the column from the tenon, it is an effective joining method for the extraction prevention of the column. Experimental value and calculated value are well correspondent to the case in which the strength of the wood material as the tenon jointing sank at 2mm was used. The estimate of ultimate strength of the tenon connection can be predicted by the equation proposed in this paper.
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松野 一成, 河野 進, 角 徹三
原稿種別: 本文
2001 年 66 巻 548 号 p.
95-100
発行日: 2001/10/30
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Cantilever type bond tests were carried out to evaluate the bond strength of reinforced concrete members confined with FRP sheets. Clear increase in bond strength due to sheet confinement was confirmed, and a tentative bond strength equation was formulated as the similar form for the contribution due to transverse steel reinforcement in the Fujii-Morita bond equation. The tentative equation was modified on the basis of the supplementary bond test results of which variable was the width of the specimens, and at last a bond splitting strength equation for the RC members confined with FRP sheets was proposed
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篠原 保二, 川道 克祥, 石飛 幸子
原稿種別: 本文
2001 年 66 巻 548 号 p.
101-106
発行日: 2001/10/30
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The primary purpose of this experimental investigation is to obtain the cyclic shear response in a cracked concrete, and to accumulate the necessary information that applies to nonlinear finite element analysis. The biaxial testing device, the vertical and horizontal load as well as displacement can be independently controlled by closed-loop servo systems, has been developed in order to establish the shear behavior in cracked concrete. The shear tests on specimens containing narrow cracks (0-0.8mm) have been carried out keeping normal displacement across the crack surface constant to study the effect of cyclic loading. The relation of normal and shear strsses to crack width and sliding displacements was discussed, and some equations which give the shear response and shear retention factor have been derived from the experimental results.
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北山 裕人, 白石 一郎
原稿種別: 本文
2001 年 66 巻 548 号 p.
107-114
発行日: 2001/10/30
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The 3-D R/C shear walls have been designed as plane shear walls in principle axis of buildings in usual structural design. However, it is necessary to consider the effect of 3D-shear walls with flange wall in order to evaluate their accurate strength and deformation properties. In this paper, the ultimate strength formulae and the failure surface of R/C L-shaped shear walls subjected to bi-directional horizontal force are derived by the upper bound theorem of the limit analysis. And their results by the limit analysis are compared with the experimental results and the analytical ones such as FEM and macroscopic model. In addition, the safety factor related to the shear failure of L-shaped shear walls are discussed.
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白石 一郎, 高木 仁之, イルサ ジェームズ
原稿種別: 本文
2001 年 66 巻 548 号 p.
115-122
発行日: 2001/10/30
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There are two strength formulae for evaluating the shear strength of R/C members in the AIJ design guideline for earthquake resisting concrete buildings. These two formulae have about same accuracy to predict the shear strength of R/C members, however, the assumptions of the strut angle of the truss mechanism and the effective factor are different in these expressions. In this study, the strut angle and the effective factor are examined by means of FEM and previous experiments. As a result, the strut angle of the truss mechanism is similar to the method B compared with the method A.
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鈴木 邦康, 大築 和夫
原稿種別: 本文
2001 年 66 巻 548 号 p.
123-130
発行日: 2001/10/30
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In this paper, we examined the ultimate shear strength of four-pile caps based on 82 specimens that tested by authors. Firstly, we classified the shear failure types into three types based on the last failure situation. Next, we proposed equations to estimate the ultimate shear strength of each failure type. In regard to the ultimate shear strength the results of the test were compared with calculated values according to the equations proposed by others as well as to that by authors. To conclude the discussions the calculated values according to the authors' equations agreed well with experimental results.
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是永 健好
原稿種別: 本文
2001 年 66 巻 548 号 p.
131-138
発行日: 2001/10/30
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A flexural analysis method of precast prestressed concrete beams considering bond-slip characteristics of prestressing steels and deformations of flexural shear cracking was proposed. In this analysis method, the widths of flexural shear cracks are evaluated as the pullout of stirrup, based on the bond force distributions of prestressing steels and tension reinforcements due to the bond-slip analysis. It is concluded that the load-deflection relationships, the crack patterns and the strain distributions of prestressing steels and stirrups in test beams can be simulated by using this analysis method.
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桑村 仁, 高木 直人
原稿種別: 本文
2001 年 66 巻 548 号 p.
139-146
発行日: 2001/10/30
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A hypothesis named 'similitude law of pre-fracture hystereses' has been applied to estimation of deformation capacity prior to brittle fracture of any type of steel connections from a single curve which describes the relationships between amplitude and accumulation of plastic deformation. However, this method of capacity estimation is open to criticism, because the basic curve was derived only from a limited set of test data, in other words, the similitude law has not yet been proved. This paper is devoted to verifying the law by means of four independent series of experimental data. It is found that the relationships between amplitude and accumulation of plastic deformation governed by ductile as well as brittle fracture can be represented by a single curve with a satisfactory degree of reliability.
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岩本 いづみ, 木村 衛, 小河 利行
原稿種別: 本文
2001 年 66 巻 548 号 p.
147-151
発行日: 2001/10/30
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To add lip stiffener to longitudinal free edge of the plate elements is effective to increase the buckling strength. With appropriate lip rigidity, lipped plate elements buckle as both edges simple supported. Adequate lip rigidity is defined by width to thickness ratio of plate element. The aspect ratio is not considered. In this paper, elastic buckling analysis of lipped thin plate element is carried out and its buckling behavior is investigated. As the aspect ratio of plate element increases, buckling mode changes from the both edges simple supported buckling mode to the distortional mode and the buckling strength decreases.
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岩本 いづみ, 木村 衛, 小河 利行
原稿種別: 本文
2001 年 66 巻 548 号 p.
153-158
発行日: 2001/10/30
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Thin plate elements stiffened by appropriate lip rigidity buckle as both edges supported plate element. The strength of both edges supported thin plate elements increases after buckling. In this paper post buckling strength and post buckling mode of lipped thin plate elements is investigated by FEM analysis. Analytical parameters are width to thickness ratio of plate element, lip width to plate width ratio and aspect ratio. Post buckling and buckling mode is classified and shown in the figure. For each mode, the maximum strength is estimated by using simple post buckling strength evaluation.
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米丸 啓介, 藤崎 忠志, 杉崎 健一, 中辻 照幸, 鈴木 弘之
原稿種別: 本文
2001 年 66 巻 548 号 p.
159-165
発行日: 2001/10/30
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A series of research to use CFRP pipes to Double-Layer Lattice Shell is progressing. The lattice shell structure is composed of CFRP truss members, and the member is composed of a CFRP pipe and connection metal parts that are installed in both ends of the CFRP pipe by rivet joints. The mechanical properties of CFRP have been found in the previous studies. In this paper, a study is made on the elastic, plastic and ultimate tensile behavior of individual components such as CFRP pipes, rivet joints and connections, based on full scale tension tests on CFRP truss members.
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一戸 康生, 鈴木 弘之, 久保田 一男, 平山 博巳, 上田 弘樹, 湯谷 孝夫
原稿種別: 本文
2001 年 66 巻 548 号 p.
167-174
発行日: 2001/10/30
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This study deals with the elasto-plastic beam-column behavior of circular steel tube columns infilled with reinforced concrete subjected to fire. Based upon the stress-strain characteristics of materials at high temperatures and the mechanics of column deflection curves, a numerical analysis method has been developed to simulate the time historical response. This method can provide a fairly good estimation for the fire resistant performance of the column. It is found that, comparing a proposed simpler superposed strength theory with the above refined numerical solution, the theory gives a satisfactory approximation to predict reinforcement effects of both steel bars and hoops on the ultimate strength of such columns.
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村岡 宏, 菅原 進一
原稿種別: 本文
2001 年 66 巻 548 号 p.
175-182
発行日: 2001/10/30
公開日: 2017/02/04
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In this study, performance for protecting fire spread of wooden shrines and temples in Taito Ward of Tokyo was evaluated based on data of distance to adjoining buildings, category of their structure, and size of their opening. Furthermore, requirements for not spreading fire by heat radiation were examined. As the results of this study, it is found that the most frequent distance to adjoining buildings were 2-3m, and the distance for not spreading fire needs more than 5m for fire resistant buildings, more than 15m for fire proof wooden buildings and more than 34m for bare wooden buildings.
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原稿種別: 付録等
2001 年 66 巻 548 号 p.
App66-
発行日: 2001/10/30
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原稿種別: 表紙
2001 年 66 巻 548 号 p.
Cover39-
発行日: 2001/10/30
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原稿種別: 表紙
2001 年 66 巻 548 号 p.
Cover40-
発行日: 2001/10/30
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