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原稿種別: 表紙
1996 年 61 巻 480 号 p.
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原稿種別: 表紙
1996 年 61 巻 480 号 p.
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原稿種別: 付録等
1996 年 61 巻 480 号 p.
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原稿種別: 目次
1996 年 61 巻 480 号 p.
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原稿種別: 付録等
1996 年 61 巻 480 号 p.
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原稿種別: 付録等
1996 年 61 巻 480 号 p.
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原稿種別: 付録等
1996 年 61 巻 480 号 p.
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原稿種別: 付録等
1996 年 61 巻 480 号 p.
_1_-
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原稿種別: 付録等
1996 年 61 巻 480 号 p.
_2_-_3_
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原稿種別: 付録等
1996 年 61 巻 480 号 p.
_4_-
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中村 成春, 橘高 義典, 上村 克郎
原稿種別: 本文
1996 年 61 巻 480 号 p.
1-9
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The objective of this paper was to clarify the influence of mixed-mode loading conditions on the load-defomation relationships and the crack propagation of notced concrete beam specimen. Mixed-mode loading conditions were made by changing the distance from the loading line to the notch line of the specimen. Crack propagation of the specimen was observed and it was compared with the result of analysis which was based on the linear elastic fracture mechanics (LEFM). According to the results, it was clarified that the crack propagating direction from the notch tip was nearly straight for the various mixed-mode conditions, and it could be assumed by the analysis of LEFM. In case which the mode II factor was increasing, the stiffness ; the maximum load ; the crack sliding displacement ; were increased, and the unstable fracture was occured.
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高橋 和雄, 重倉 祐光
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1996 年 61 巻 480 号 p.
11-19
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This study aimed the utilization of waste gypsum board as raw materials. The merit of this recycle method is can be utilize waste gypsum boards without separate process of covered paper from gypsum layer. The conclusions of this experiment are as follows. 1. Most desirable curing method and mixing ratio for slag-gypsum boards were presented. 2. Concerning to the pretreatment of waste gypsum boards, wet crushing system produced better results than dry system. 3. It is found that waste gypsum boards can be utilize as the raw materials for slag-gypsum board by ordinary Hatcheck-system.
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岡島 達雄, 河辺 伸二, 武藤 正樹
原稿種別: 本文
1996 年 61 巻 480 号 p.
21-26
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The appearance of building materials changes with their moisture conditions of their faces. Following findings were obtained from the limited number of psychological and physical test. 1) The color of the material with cosine of contact angle to water larger than 2.0, looks different between in a dry condition and in a wet condition. 2) The color of the textured material with glossiness less than 6% in a dry condition, looks different from that with glossiness of 50 to 60% in a wet condition. The color of the smooth material with glossiness of 60 to 130% in a dry condition, looks same as that with glossiness of 40 to 70% in a dry condition. 3) The color of the material of which color difference dE^* is greater than 2.0 between in a dry condition and in a wet condition, looks different.
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金崎 俊造, 長谷川 寿夫
原稿種別: 本文
1996 年 61 巻 480 号 p.
27-33
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We wish this study enable us to select a suitable construction method of the external wall in cold district. We set up several ALC external walls in several conditions of outdoor temperature and indoor humidity, and measured the quantity of vapor flowed into the walls from indoor and the quantity of internal vapor condensation of the walls. As a result, when the outdoor temperature changed with one day period, the lower the maximum outdoor temperature, the more the quantity of the internal vapor condensation. And we knew the vapor flowed into the wall had a tendency to concentrate in the freezing area of the wall in case of the change of the outdoor temperature.
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壇 一男, 宮腰 淳一, 八代 和彦
原稿種別: 本文
1996 年 61 巻 480 号 p.
35-46
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A primitive procedure was proposed for evaluating earthquake response spectra of large-event motions to make use of records from smaller events. The result of the regression analysis of the response spectra was utilized to obtain the site amplification factors in the proposed procedure, and the formulation of the seismic-source term in the regression analysis was examined. A linear form of the moment magnitude, Mω, is good for scaling the source term of moderate earthquakes with Mω of 5.5 to 7.0, while a quadratic form of Mω and the ω-square source-spectrum model is appropriate for scaling the source term of smaller and greater earthquakes, respectively.
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林 康裕, 護 雅史
原稿種別: 本文
1996 年 61 巻 480 号 p.
47-56
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This paper presents an emergent method of new types of passive control buildings. In the process, a hybrid approach of a Genetic Algorithm and a nonlinear response analysis code is used to emerge a candidate set of vibration control buildings. Then, a tree-based model is used to classify and analyze the candidate set. This method enables us to determine the number, type or properties of control devices, and the type, dimension or location of the other structural members. In our numerical example, a high-rise building, whose primary structure and secondary structure are connected by hysteresis type dampers, is adopted. The stiffness and mass distribution of the building, the type of control buildings, and the yielding force of dampers are determined simultaneously using our method.
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佐藤 智美, 佐藤 俊明, 植竹 富一, 菅原 良次
原稿種別: 本文
1996 年 61 巻 480 号 p.
57-65
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Average and standard deviation of group delay time in frequency domain mean the centroid and the duration of wave series in time domain. We show fundamental study for envelope characteristics of long period strong motions by using this relation. In this study we use JMA 87 type records at 26 sites during 1990 Izu-Oshima Kinkai earthquake in a period range of 1 to 15 sec. First we show proper ways to calculate group delay time and its average and standard deviation. Then it is confirmed that the dispersion characteristics of observed surface waves are simulated well by average and standard deviation of group delay time calculated in a narrow frequency band. From these results it is found that the average and the standard deviation of group delay time can be used to represent envelope characteristics of strong motions if they are calculated properly as described in this paper. By using observed records after correction the start time of recording to origin time we found that epicentral distance is one of the influential parameters to both the average and the standard deviation of group delay time and that the relation between them can be physically interpreted.
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川瀬 博, 林 康裕
原稿種別: 本文
1996 年 61 巻 480 号 p.
67-76
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We estimate a bedrock motion on the Rokko granite rock from the record observed at the JMA Kobe station during the Hyogo-ken Nambu earthquake of 1995 and use it to simulate strong motions in the Sannomiya district in Chuo Ward, Kobe, where heavily damaged buildings were concentrated. We use a two-dimensional finite element method to model local topography, shallow sub-surface layers, and a deep basin structure formed by the Rokko faults. The inverted bedrock motion has a peak ground acceleration of 335 cm/sec^2 and a velocity of 55 cm/sec. Then we calculate responses of the Sannomiya ground model without holocene layers assuming most plausible, linear soil constants. The resultant ground motions have peak accelerations or velocities well exceeding 800 cm/sec^2 or 100 cm/sec, respectively, in the narrow zone 750m away from the fault. These peak values could be more on the surface since holocene layers would amplify them. We verified our scheme by comparing the results of nonlinear analysis with the borehole records observed at the Port Island, one of reclaimed islands in Kobe. These results suggest that both a deep basin structure and shallow holocene layers have to be taken into account to simulate the strong ground motions and hence to explain damage concentration in Kobe during the Hyogo-ken Nambu earthquake.
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榎田 寛治
原稿種別: 本文
1996 年 61 巻 480 号 p.
77-87
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Stresses of wall with a round opening are analyzed for the case of normal loads acting on the arc boundary of a circular finite plate. For this solution, a new stress function is assumed in terms of bipolar coordinates, and the distribution of normal loading along the arc boundary is directly expanded to Fourier series. The stress distributions of the analytical and the photo-elasticity experimental results are shown. And stresses of the Reitai Arched Stone Bridge are analyzed. The analytical and the experimental results accord with each other.
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修行 稔, 岡 延夫, 李 剣平
原稿種別: 本文
1996 年 61 巻 480 号 p.
89-94
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A numerical method for elastoplastic large deformation analysis of steel space frames incorporating the effect of semirigid joints is presented. A node zero length connection element is used to model the joint behavior. The tangent stiffness matrix for a member is obtained by introducing the connection element as the member end compliance. The reliability of the method is examined by available three examples and the influence of the rigidity of gusset plate connections of web members on the inelastic collapse of tubular trussed tower leg is studied.
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風間 了, 森脇 登美夫, 元井 康雄
原稿種別: 本文
1996 年 61 巻 480 号 p.
95-102
発行日: 1996/02/28
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Recent building construction employs often earth retaining structure supported with ground anchors for excavation, for spacious underground facilities. This paper presents a calculation method for the structure of this type. It takes into account the subgrade reaction by the surrounding soil which may act on the wall from non-excavation side, when an additional load is applied to the ground anchors by means of jacks. The non-linear properties of the soil are also considered in this case. Comparison of the theory with experiments on an earth retaining structure with five anchors seated at various depth was satisfactory, proving usefulness of the present method.
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土方 勝一郎, 今村 晃, 柳下 文雄, 富井 隆, 中井 正一, 高橋 郁夫, 吉田 一博, 瀧 諭
原稿種別: 本文
1996 年 61 巻 480 号 p.
103-112
発行日: 1996/02/28
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So-called extended sway-rocking model is frequently used in the design of embedded massive structures. When structures are embedded in soft surface layers, the model is apt to give larger shear force in the under-ground parts than the finite element method. In this paper, the authors have made clear through numerical survey using simplified models that this tendency can be attributed to the poor estimation of side wall impedance employed in the ordinary model. The authors have also proposed two modified models to evaluate the side wall impedance, and proved that the two models give more reasonable results than the ordinary sway-rocking model when foundations are embedded in soft surface strata.
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杉崎 健一, 河村 繁, 半谷 裕彦
原稿種別: 本文
1996 年 61 巻 480 号 p.
113-122
発行日: 1996/02/28
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One of the targets in the design of large-span structure is to minimize the weight. Based on this point, a new type of single-layer lattice shell consisted of aluminum members and joints has been developed and examined by authors since 1989. This single-layer lattice shell has insertion joint system which shows semi-rigid characteristic for the bending moment. In order to grasp the structural behaviours of the lattice shell, the following reseaches have been planed and performed : (1) Experiment of structural elements such as member and joint, (2) Experiment of small-scale models. In the first part, the tensile, compressive and bending tests for structural elements are shown in order to examine the stiffness and the ultimate strength. In the second part, the structural behaviour of four kinds of small-scale models with a diameter of 4.2 meters are examined under an uniform load and an concentrated load in the center part. For all models, torsional instability of node occurs because the bending rigidly in the in-plane direction is weaker. In the third part, exparimental results are presented and evaluated in detail.
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松野 浩一, 青木 繁, 鈴木 英次
原稿種別: 本文
1996 年 61 巻 480 号 p.
123-132
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In the wooden single-layer space frame, the authors have been studying the influence of a bolted joint looseness, furthermore, have suggested that a bolted joint looseness should be substituted an axial and a bending rigidity in the analytical model. In this paper, judging from our several experimental studies on a bolt-wood bearing test that already been examined, the authors discussed the influence of loading direction for a wooden compressive strain inclined to the grain. In particular, as the comparison between our original experimental formulas and Hankinson formulas, the former are confirmed.
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木村 衛, 楠 寿博, 太田 道彦
原稿種別: 本文
1996 年 61 巻 480 号 p.
133-140
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Glulam specimens with a large section were tested to find the effect of the processing accuracy of joints on the strength of bonded joints experimentally, furthermore bending tests were carried out with the full scale glulam specimens in order to investigate the bending strength of bonded joints. As a result, the following conclusions were obtained. Bending strength of the bonded joint is substantially subject to the processing accuracy of the joint part, and full strength connection of glulam with a large section will be feasible by big finger joint or scarf joint made under sufficient accuracy control.
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岩原 昭次, 山下 正吾, 小森 清司, 鈴木 功
原稿種別: 本文
1996 年 61 巻 480 号 p.
141-150
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The purpose of this paper is to examine flexural behaviors under long-terra sustained loads analytically and investigate the validity for the procedure of the prediction of the long-team deflection proposed hereon for composite floor slabs clamped at both edges. The number of specimens used in experiments is three, and these forms, steel arrangement and span length are same. And calculated results due to the procedure of the long-term deflection proposed coincided with experimental results successfully.
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尹 元奎, 浜原 正行, 本岡 順二郎
原稿種別: 本文
1996 年 61 巻 480 号 p.
151-160
発行日: 1996/02/28
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In this paper, cyclic reversed loading tests were conducted in order to investigate the hysteretic behavior of the precast prestressed concrete columns subjected to bending and shear. The test variables include : prestress at the centroid of a section, an axial force, an amount of confinement reinforcement ratio and an existence of a joint. On the basis of the test results, a rigorous restoring force characteristics model was presented for the different prestress and axial force. This model coincides well with the test results, in term of the shape of the hysteretic loop and hysteretic damping. Furthermore, the validity of this model was verified by comparing this model with 66 previous systematic test results.
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鈴木 敏郎, 小河 利行, 末岡 利之
原稿種別: 本文
1996 年 61 巻 480 号 p.
161-170
発行日: 1996/02/28
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The confirmation of the collapse shape (buckling mode) of H-shaped beam is significant for limit state design. In the case affected by lateral torsional buckling, the general slenderness ratio is used as measure. In this study, the approximation of the general width-thickness ratio (as measure in the case of local buckling) based on the same concept as general slenderness ratio is presented. This approximation is produced by buckling analysis using the finite element method. And the varidity of classifying buckling mode based on the comparison between these above ratios is investigated. Futhermore, the presented bracing method (control of the collapse mechanism considering the above matter) is discribed. The control of collapse mechanism is made to be possible by the presented bracing attachment.
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鈴木 敏郎, 元結 正次郎, 内山 政彦
原稿種別: 本文
1996 年 61 巻 480 号 p.
171-178
発行日: 1996/02/28
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In respect to H-shaped steel stiffened by concrete, the followings have been comprehended from examining plastic mechanical behavior of stub columns under compression. 1. Concrete-crash does not much influence the stiffening effect if b/t_f is relatively small. 2. The stiffening effect can be examined by the proposed analytical method including confinement of out-of-plane deformation of the web. 3. Collapse mechanism is influenced by the web stretching according the flange local buckling. 4. Plastic deformation capacity can be quantitatively evaluated by α(=√<(t_f/b)・(t_w/d)> derived from the proposed collapse model. 5. From the evaluation equation, plastic deformation capacity is much affected by d/t_w as b/t_f is larger.
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河井 宏允, 浅見 豊
原稿種別: 本文
1996 年 61 巻 480 号 p.
179-180
発行日: 1996/02/28
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Dynamic along wind forces on tall buildings were estimated based on the results of the force balance tests carried out in the turbulent boundary layer wind tunnel. The empirical formula for static and dynamic wind forces were proposed. The dynamic wind forces estimated by the formula were much greater than the values given in 'Recommendation of Loads on Buildings (AIJ)'. It is considered that this large discrepancy comes from the over-estimation of the fluctuating coefficient of overturning moment in the empirical formula. When the fluctuating coefficient of overturning moment is corrected based on the wind tunnel results in the paper, the dynamic along wind forces estimated by the empirical formula are as same as the values given in the recommendation.
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崔 恒, 神田 順
原稿種別: 本文
1996 年 61 巻 480 号 p.
181-182
発行日: 1996/02/28
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The authors greatly appreciate their discussion. The discussion results can be summarized as follows ; (1) The fluctuating coefficients of overturning moment are used appropriately in the proposed formulae. (2) The proposed formula for gust response factor estimation is corrected. (3) Recommendation of Loads on Buildings may lead to underestimated dynamic alongwind force with respect to wind tunnel experiment results.
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池浦 友則, 武村 雅之
原稿種別: 本文
1996 年 61 巻 480 号 p.
183-185
発行日: 1996/02/28
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Scaling factors in semi-empirical strong motion syntheses in above paper are discussed on following items : 1) Accuracy of numerical calculation of synthetic ratios, 2) Derivation of theoretical scaling factors for deterministic smi-empirical methods, 3) Interpretation of synthetic ratios at distant sites.
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趙 文方, 壇 一男, 田中 貞二
原稿種別: 本文
1996 年 61 巻 480 号 p.
187-188
発行日: 1996/02/28
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The authors are grateful to Dr. Tomonori Ikeura and Dr. Masayuki Takemura for their discussion, and our answers are summarized as follows ; (1) The smoothing process of the scaling factors in our calculation, not described in our paper, caused the difference between their results and ours, showing our final conclusions to be correct. (2) The averaged scaling factors in a high-frequency range were shown here to vary from n to about 2n/5 for n from 1 to 50, and not to be 1 as they insisted, in the case of method B at infinitely distant sites. But, the averaged scaling factors were concluded to be n in the actual syntheses as we had written in our paper.
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原稿種別: 付録等
1996 年 61 巻 480 号 p.
App9-
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原稿種別: 表紙
1996 年 61 巻 480 号 p.
Cover6-
発行日: 1996/02/28
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