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原稿種別: 表紙
2007 年 72 巻 622 号 p.
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原稿種別: 表紙
2007 年 72 巻 622 号 p.
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原稿種別: 付録等
2007 年 72 巻 622 号 p.
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原稿種別: 付録等
2007 年 72 巻 622 号 p.
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原稿種別: 付録等
2007 年 72 巻 622 号 p.
App89-
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原稿種別: 付録等
2007 年 72 巻 622 号 p.
App90-
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原稿種別: 付録等
2007 年 72 巻 622 号 p.
App91-
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原稿種別: 付録等
2007 年 72 巻 622 号 p.
App92-
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原稿種別: 付録等
2007 年 72 巻 622 号 p.
App93-
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渡邉 悟士, 桝田 佳寛, 陣内 浩, 黒岩 秀介, 並木 哲
原稿種別: 本文
2007 年 72 巻 622 号 p.
1-7
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In this study, the influence that crushing and moisture exerted on mechanical properties of crushed stone was evaluated, and the method for evaluating mechanical properties of crushed stone in high strength concrete with its raw ore was examined. The results indicate that mechanical properties of crushed stone are appreciable as those of its raw ore because serious crack in crushed stone for high strength concrete is not caused at the stage of crushing. However, when compressive strength of crushed stone with large percentage of absorption is evaluated, it is necessary to consider the influence by the difference of total moisture content between crushed stone in concrete and its raw ore.
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早野 博幸, 丸山 一平, 野口 貴文, 栩木 隆
原稿種別: 本文
2007 年 72 巻 622 号 p.
9-16
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In order to evaluate the effect of autogeneous shrinkage and tensile creep property on stress of concrete under quasi-complete restraint condition as well as cracking behavior, Variable Restraint Testing Machine (VRTM) was developed. Using this machine, cracking potential of variable high-strength concrete in early ages were evaluated. According to those experiments, following results were obtained: (1)Tensile strength of concrete was higher than splitting tensile strength, while concrete under small stress/strength ratio. (2)Tensile strength of concrete under restrained condition was changed according to the amount of tensile creep strain. Larger amount of tensile creep strain reduced the tensile strength.
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中田 善久, 澤本 武博, 大塚 秀三, 春山 信人
原稿種別: 本文
2007 年 72 巻 622 号 p.
17-23
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In this study, the effects of different of various sorts of cements and ages on elastic modulus of elasticity of high-strength concrete were investigated. As a result, the shorter the period of curing, the smaller the development of elastic modulus of elasticity, even though the same compressive strength of high-strength concrete was obtained. In case low-heat portland cement was used, the tendency appeared in particular conspicuously. Furthermore, the shorter the period of curing, the smaller the calculated value of elastic modulus of elasticity according to the New RC formula. Therefore, it is considered that the calculated value can be made more accurate when coefficients of cements and ages are added to the New RC formula.
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寺内 利恵子, 早川 光敬, 陣内 浩, 黒岩 秀介
原稿種別: 本文
2007 年 72 巻 622 号 p.
25-31
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From this pumping experiment of ultra-high-strength concrete of Fc150N/mm^2, the change in the performance of fresh concrete and the hardened concrete etc. before and after pumping, the following were presumed. (1) After pumping, the reverse-slump flowing time was showed the tendency to shorten when ultra-high-strength concrete of Fc150N/mm^2 was pumped compared with before pumping. It was thought that some changes occurred to mortar between before pumping and after pumping since this reason was examined with a rotation wing type viscosity meter, and the plastic viscosity of the mortar after pumpimg was decreased. (2) A significant difference was not admitted in the performance of the hardened concrete before and after pumping in this range of the experiment. (3) It was thought that a pressure loss with a low-water-binder ratio concrete was strongly influenced from plastic viscosity by yield value. (4) It is possible to presume roughly that the pressure loss of ultra-high-strength concrete has a correlation to the product of calculated plastic viscosity and the pumping rate in the low-water-binder ratio, in the range 30% or less.
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西田 朗, 名和 豊春, 山崎 庸行
原稿種別: 本文
2007 年 72 巻 622 号 p.
33-39
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This study is for assessment of elastic modulus of elasticity on high-strength concrete with material segregation in a structural member. It identified the fact below. The variance of elastic modulus of elasticity in vertical direction of the member was reproduced by applying an estimated elastic modulus of elasticity given by the theory of composite material in considering material segregations to the result of the test of a specimen of the structural member. This result also represents the distribution range of the elastic modulus of elasticity for the inner area of structural members affected by material segregation.
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石川 嘉崇, 江 耀宗
原稿種別: 本文
2007 年 72 巻 622 号 p.
41-48
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With the severe thermal conditions on roofs, to secure water retention in porous concrete for use in planting is a paramount issue in plant growth. In recent years, numerous water-retentive polymers have been developed that can retain water in quantities hundreds of times heavier than their own weight. In this study, various properties needed for rooftop greenery system materials were examined and compared by using different existent absorbent polymers on thin-type porous concrete. The effects on vegetation growth of water-retentive polymers were also examined. The main results obtained are the following. 1) The water volume usable by vegetation was ranged from 62% to 87% of total water retention volume. 2) The water retention volume became constant in about eight hours. 3) The effect in vegetation growth was differed by type of water-retentive polymer. 4) The test results showed that acrylamide-acrylic acid polymer was the best water-retentive agent for use in greenery base porous concrete. And it was comfirmed that it almost had the performance similar to a lower water-retentive layer of porous concrete by the examination without sprinkling water.
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野津 剛, 田村 哲郎
原稿種別: 本文
2007 年 72 巻 622 号 p.
49-56
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Concerning the wind resistant problems for buildings and structures, wind tunnel test and numerical simulation have been conducted out of consideration of effect of thermal stratification. However, it is confirmed that the observed wind profile in the typhoons is different from the wind profile in the boundary-layer type of flows and determined by strong convective effects. In this study, we numerically generate approaching flows with the effect of thermal stratification. Under these approaching flows we conduct numerical simulation for the flows around a 3D square cylinder. It is recognized that the flow field is much changed by the effect of thermal stratification and the position of the vortex on the side and the rear of the cylinder varies with the thermal conditions. As a result, the power spectrum of wind forces and pressure characteristics are also affected.
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岡田 創, 大熊 武司, 片桐 純治
原稿種別: 本文
2007 年 72 巻 622 号 p.
57-64
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Considering a condition of roof tiles in which just before the tiles fly apart from a roof in a strong wind, they are flattering and lifted. Then it is expected that the peak forces on the tiles are different from those on tiles without lifting. In this paper, it is clarified that the negative peak force coefficients on tiles increase due to tiles' lifting through full-scale measurements with tiles lifted artificially. The increase is caused by the change of the external pressure in the region where flows separate from the edge of roof. For tiles in the region where the separation flow reattaches, the increase is caused by the change of the internal pressure. Then the negative peak forces are estimated from the fluctuating external pressures over the roof by the quasi-static method. The estimations for the tiles in the region where the flows separate are in good agreement with those obtained from the full-scale measurements. But for the tiles in the region where the flows re-attach, the negative peak forces are underestimated because the local fluctuations of the internal pressure are neglected.
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上田 宏, 日比 一喜, 菊池 浩利
原稿種別: 本文
2007 年 72 巻 622 号 p.
65-72
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The external pressure on buildings causes variations in the pressures inside the buildings. This paper describes a simulation of internal pressure fluctuations that the wind induces in nominally sealed but actually leaky low-rise buildings. The internal pressure was measured by wind-tunnel experiments with models of low-rise buildings having leaky apertures. A simulation model was constructed to idealize, as a laminar flow in a circular pipe, the leakage flow in an aperture induced by the difference between the external and internal pressures. The external pressure fluctuations obtained from the experiments were fed to the model to simulate the internal pressure fluctuations induced in nominally sealed but actually leaky low-rise buildings. This simulation shows that the simulated fluctuations of internal pressure serve as a good representation of the results of the experiments.
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山根 尚志, 長橋 純男
原稿種別: 本文
2007 年 72 巻 622 号 p.
73-82
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The purpose of this paper is to develop a generation method of simulated earthquake ground motion in terms of Love waves for building structural design. In this method, a Love wave for structural design is synthesized by the transfer function, the Fourier amplitude and the Fourier phase. It is proposed to apply the transfer function of a Love wave to the Fourier amplitude without the effect of subsurface layer. The amplification is easily calculated since it is provided as a function of the phase velocity. The Fourier phase is selected among the records of earthquake ground motion on the basis of the standard deviation of the phase differences related to the dispersion of waves caused by the effect of a sedimentary basin. The proposed method is validated by the comparison between simulated and observed earthquake ground motion on sedimentary basins.
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岩田 範生
原稿種別: 本文
2007 年 72 巻 622 号 p.
83-90
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This paper describes the local parameter (story stiffness and damping coefficient) estimation method directly using absolute acceleration records. This method consists of 2 steps. The first step estimates all modal parameters by absolute acceleration pulse response function method. In the second step, story stiffness and damping coefficients are evaluated by the theory relationship between modal and local parameters. With this method, not only the local parameters but also those probabilistic errors can be easily evaluated. In addition, it is possible to evaluate the frequency-dependent properties of the local parameters. The applicability of the method is clarified by both numerical simulation data and experimental data. It is found that the method exactly estimated the story parameters, including those frequency dependencies.
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西村 督, 牧野 歩実
原稿種別: 本文
2007 年 72 巻 622 号 p.
91-97
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Varying several parameters such as loads, sectional properties, material and etc. in a structural system, the stability boundary is represented as the locus of critical points on the equilibrium path. We propose a computational method, in which the perturbation procedure is utilized, for tracing stability boundary on elastic structures under combined loads. The determinant of tangent stiffness matrix can be expressed as the product of its eigenvalues. The fundamental condition is an equation that the determinant, which is represented by the perturbation coefficients of eigenvalues, vanishes. Numerical results show that the proposed method can trace the stability boundary for elastic structural systems accurately.
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齊藤 隆典, 越川 武晃, 上田 正生, 菊地 優
原稿種別: 本文
2007 年 72 巻 622 号 p.
99-106
発行日: 2007/12/30
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Two dimensional non-linear analysis of reinforced-concrete frame structure considering shear behavior of joint panel is presented in the paper. Inelastic joint shear action under reversed-cyclic loadings is complicated: interaction between shear deformation of joint panel and bond failure of longitudinal reinforcements embedded in the joint. The purpose of the research is to propose a simple beam-column joint model to predict such a behavior of a joint panel. A finite element formulation of fiber beam/column elements, new joint element considering shear deformation and material model defined in analysis are presented. Simulation analyses for three different type beam-column joint specimens are conducted to confirm the validity of the proposed method.
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中村 尚弘
原稿種別: 本文
2007 年 72 巻 622 号 p.
107-114
発行日: 2007/12/30
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It is well known that the soil damping depends both frequency and strain and the damping is considered as the sum of the hysteretic damping and the scattering damping. In the previous paper, the time history nonlinear ground response analysis method using the causal models for both the hysteretic damping and the scattering damping was proposed. The basic characteristics of the proposed method were studied using the 1 DOF model and the validity of the method was confirmed. In this paper, nonlinear causal hysteretic damping model was applied to the multi node system soil model. The response behavior was compared with the conventional model e.g. Ramberg-Osgood model and SHAKE model. The characteristics of proposed model were studied concerning to the effects of element division, the effect of the peculiar parameters for the model, and the effects of the frequency dependency that is the strong feature of the model. The efficiency of the model was confirmed by these studies.
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冨永 晃司, 陳 群麗, 田村 昌仁, 若井 明彦
原稿種別: 本文
2007 年 72 巻 622 号 p.
115-120
発行日: 2007/12/30
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It was found in the book written by Peck R.B. and Hanson W.E (1953) that a driven tapered pile should have greater skin friction than that of a straight-sided pile. The authors have made the study on vertical behavior of a tapered pile installed by the press-in method, and proposed an analytical method based on non-linear Winkler model for the tapered pile. This paper presents the analytical method of a laterally loaded tapered pile considering both of non-linear behaviors of the pile and surrounding soil. On the other hand, the authors made the lateral loading tests on the steel pipe tapered piles in Kanto Loam. This paper also presents the outline of the tests, and comparisons between the lateral displacements and bending moments from the tests and predicted by the method. From the comparisons, it is found out that the predictions are in a fairly good agreement with the test results.
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小林 研治, 稲山 正弘, 安藤 直人
原稿種別: 本文
2007 年 72 巻 622 号 p.
121-128
発行日: 2007/12/30
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Screws are commonly used for timber constructions. Especially, single-shear characteristics of screw joints with structural panels are important. New estimating equations on initial stiffness, yield strength, secondary stiffness, and ultimate strength of single-shear screw joints were proposed. To confirm validity of the hypothesis, load-deformation curves on a series of single-shear test were measured. The simple estimating equations of initial stiffness under considering a fastener as rigid-body were applicable enough by defining "effective rigid-body length." The yield strength was evaluated as the sum of yield strength by European Yield Theory and friction caused by initial axial force of the fastener. The secondary stiffness could estimate by using axial force. But in some series, the estimation value was higher than the test value because a selected yield mode was different from the actual yield mode. The ultimate strength could be predicted from yield strength and axial force.
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福山 弘, 安藤 直人, 稲山 正弘, 竹村 雅行, 井上 雅文
原稿種別: 本文
2007 年 72 巻 622 号 p.
129-136
発行日: 2007/12/30
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The aim of this research is to make a design formula for shear connection of wooden/wood-based-material dowel. This paper is mainly focused on introduction of basic design formula on load-slip stiffness and strength of wooden dowel shear joint. Various slender-type symmetrical single shear tests were conducted. Much of the experimental result had good coincidences with the analysis. A simple expression of stiffness calculation and a new concept of bearing-spring characteristics are proposed. Compared with steel, wood can be easily deformed by shear stress. Shear deformation of fasteners should be taken into account in the case of wooden dowel. And as a series bearing-spring of timber and dowel, the effect of dowel hardening should be taken into account.
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片岡 靖夫, 北守 顕久, 越智 弘幸, 豊田 洋一, 小松 幸平
原稿種別: 本文
2007 年 72 巻 622 号 p.
137-144
発行日: 2007/12/30
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Traditional wooden dram towers of Dong Race villages in China have been constructed with columns and beams. The beams penetrate the columns, and they are connected and stiffened in the column joint without nails, steel connectors and wedges. The purpose of our investigation is to make clear Drum-Tower construction system of the main frame and the roof structure. We thoroughly investigated the details of the structure and construction system of Zaojin dram tower which is the oldest tower in Dong villages, and we proved our proposition of the construction system by manufacturing the scale model and CG.
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尾崎 純二, 倉本 洋, 河本 孝紀
原稿種別: 本文
2007 年 72 巻 622 号 p.
145-153
発行日: 2007/12/30
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The seismic performance evaluation for seventy seven models of precast reinforced concrete wall panel houses was executed to construct the structural design method based on the Calculation of Response and Limit Strength (CRLS). Examining the influence of the wall-length ratio on the seismic performance of wall-type houses consisting of precast reinforced concrete panels with ribs, appropriate limit values of the wall-length ratios applicable to the structural design method were found. This paper shows the relationships between the wall-length ratios and the seismic performance of the houses, and outlines the structural design method with wall-length ratio evaluation based on CRLS.
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高瀬 裕也, 和田 俊良, 上田 正生
原稿種別: 本文
2007 年 72 巻 622 号 p.
155-162
発行日: 2007/12/30
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In the previous paper, the authors proposed the new shear loading system in order to evaluate shear transfer mechanism on concrete crack surface. The overview of this testing system was explained already. In this paper, the shear transfer mechanism is verified from experimental results conducted using this new device. Furthermore, the experiments with constant contact ratio is conducted to observe the behavior of contact stress on local crack surface. As a result, the behavior of contact stress can be obtained for the first time. And it was confirmed that softening phenomenon was occurred on local crack surface.
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平石 久廣, 稲井 栄一, 福島 徹
原稿種別: 本文
2007 年 72 巻 622 号 p.
163-168
発行日: 2007/12/30
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In this paper, it is expressed how the period elongation and damping due to the plasticity of a building influence on the required horizontal force of a building. In order to obtain the result, based on the formula of the required lateral force using the equivalent linearization technique proposed previously by authors, the bi-linear restoring force model was used. Moreover, the significance and problems of the method for lateral load carrying capacity of the current seismic regulation are discussed, based on the knowledge acquired from these investigations. Furthermore, the correction method for lateral load carrying capacity is proposed for more rational regulation.
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桑村 仁, 伊藤 拓海
原稿種別: 本文
2007 年 72 巻 622 号 p.
169-176
発行日: 2007/12/30
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Frictional resistance of a rotating steel cone in contact with the inner edge of a steel cylinder is theoretically investigated on the basis of the classical law of friction proposed by Amonton and Coulomb. The derived formula for the frictional moment was applied to the analysis of experimental data from two types of compression test with eccentricities. The test by an actuator machine with high compression showed that the theoretical solution is practically admissible for the prediction of frictional moment except the cone of a sharp apex due to the radial deformation of the cylinder edge. The other test by an eccentrically suspended sand bucket with low compression showed that the friction coefficient has almost the same value irrespective of the cone angle as well as the cylinder diameter, which suggests that the simple theory works well for the prediction of the frictional rotation resistance of the socket connection.
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瀧口 克己
原稿種別: 本文
2007 年 72 巻 622 号 p.
177-178
発行日: 2007/12/30
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The above mentioned paper deals with the blast demolition of structures, which has been practical technique for four decades. Electromagnetic holders were used in the demolition experiment. The discusser wants to ask whether electromagnetic holders can simulate the actual break phenomena of reinforced concrete members due to explosion or not. There is no data on the actual behaviors of blast demolition in the paper. What is the strongest argument about the practicality of the analytical and experimental methods developed by the authors of the paper?
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磯部 大吾郎, 江口 正史, 今西 健介, 佐々木 嗣音
原稿種別: 本文
2007 年 72 巻 622 号 p.
179-180
発行日: 2007/12/30
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The authors would like to thank Prof. Katsuki Takiguchi for his discussion, and the answers are as follows; (1) The demolition experimental system we developed using electromagnetic holders only expresses the overall behavior of member fracture, and does not pursuit the details of material behavior. One of the objectives of developing the system, as written in the paper, is to obtain experimental data of overall collapse phenomena to confirm the validity of the numerical results and to improve the developed numerical code. The implementation of detailed material behavior is our future assignment. (2) We confirmed high practicability in the re-productivity of demolition process by the experimental system which enables us to compare quantitatively with numerical results, and also in the cost performance of the numerical code. (3) The blast demolition technique is a practical demolition technique matured by professional engineers for many decades, which is, however, closed in a few, top-skilled engineers or companies. The main objective of this study is to systemize the know-hows and the skills of the blast demolition techniques from a mechanics point of view. As a start, we aimed the construction of a low-cost numerical code and an experimental system which can be comparable and reliable in multicycle use.
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原稿種別: 付録等
2007 年 72 巻 622 号 p.
App94-
発行日: 2007/12/30
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原稿種別: 付録等
2007 年 72 巻 622 号 p.
App95-
発行日: 2007/12/30
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原稿種別: 付録等
2007 年 72 巻 622 号 p.
App96-
発行日: 2007/12/30
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原稿種別: 表紙
2007 年 72 巻 622 号 p.
Cover47-
発行日: 2007/12/30
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原稿種別: 表紙
2007 年 72 巻 622 号 p.
Cover48-
発行日: 2007/12/30
公開日: 2017/02/25
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