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原稿種別: 表紙
2007 年 72 巻 619 号 p.
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原稿種別: 表紙
2007 年 72 巻 619 号 p.
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原稿種別: 目次
2007 年 72 巻 619 号 p.
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原稿種別: 付録等
2007 年 72 巻 619 号 p.
App63-
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原稿種別: 付録等
2007 年 72 巻 619 号 p.
App64-
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原稿種別: 付録等
2007 年 72 巻 619 号 p.
App65-
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原稿種別: 付録等
2007 年 72 巻 619 号 p.
App66-
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原稿種別: 付録等
2007 年 72 巻 619 号 p.
App67-
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陳 海峰, 河辺 伸二
原稿種別: 本文
2007 年 72 巻 619 号 p.
1-6
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The effect of concrete compacted in the horizontal vibration method with a low vibration and a high amplitude was examined by using the color concrete. When the concrete was compacted by this method, it was guessed that the distribution of wave pressure that worked at the impact side of the mould effected the compaction. The wave motion theory of the harbor engineering was applied this study. It was considered that the distribution of wave pressure was controlled as wave height and height at placing of concrete. This theory was verified by using three elements of the height at placing of concrete, the vibration acceleration and the slump. When the height at placing was larger than twice the wave height, compacted was difficult. When the height at placing was smaller than twice the wave height, the wave height was large and surface condition became better along with the vibration acceleration and the slump.
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渡辺 誠一, 村上 心, 田中 睦子
原稿種別: 本文
2007 年 72 巻 619 号 p.
7-12
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This article attempts to clarify the changing process concerning strength and drying shrinkage strain of concrete walls focusing on leaked water volume escaping from forms when placing concrete. As the result of comparison with five kinds of deferent opening forms and tow case, the more leaked water volume is, the higher compressive strength is getting and the less drying shrinkage strain is. However as for the metal lath form, strength is getting lower and strain is less, because of loss of mortar paste.
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嵩 英雄, 川口 徹, 浜島 雅尚, 江口 清, 曾根 徳明, 守屋 健一
原稿種別: 本文
2007 年 72 巻 619 号 p.
13-19
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This paper presents the results of series of experimental study on the use of fly ash for mass concrete. In laboratory experiment, concrete mixtures with 15 to 40% flyash replacement to Portland cement were tested for workability, strength development with age on cylindrical specimens and temperature rise due to heat of hydration on insulated specimens. In field experiment, concrete mixtures with 15 and 25% fly ash replacement were cast into model walls with thickness of 20cm and 120cm, and were tested for temperature rise, compressive strength on drilled core specimens at the ages of 4, 13 and 65weeks. Carbonation depth were tested at 65 weeks. Effects of fly ash on heat of hydration, temperature rise and strength developmet in massive model walls were discussed.
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柳 東佑, 高 正遠, 兼松 学, 野口 貴文
原稿種別: 本文
2007 年 72 巻 619 号 p.
21-26
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Deterioration of concrete structure is caused by mass transfer with moisture. In order to predict the service life of concrete structures quantitatively, it is necessary to clarify the mechanism of deterioration of concrete and reinforcement at exposure state from the viewpoint of moisture movement affected by environmental condition. Especially rainfall may cause water penetration heavily and deeply in a liquid state and leads to more significant changes of water content in concrete than a process in a vapor state. In this paper the effects of a cover roof and a crack in concrete on the moisture movement were investigated experimentally using specimens embedding humidity sensors and electrodes. Experimental results showed that water penetrated more deeply in uncracked concrete with higher water-to-cement ratio but water content did not change in the deeper part than 5cm. In case of cracked concrete the wider crack caused faster and deeper water penetration, and the water content in the deep part increased before the saturation of surface part in the concrete with lower water-to-cement ratio. The change of relative humidity in the concrete due to temperature change showed different trends depending on the humidity in the pore.
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榎本 教良, 田中 享二
原稿種別: 本文
2007 年 72 巻 619 号 p.
27-32
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Construction sealant is the material to maintain the waterproof and airtight functions, and it's function depends on adhesive property, movement capability and weatherability. Testing methods of adhesive property and movement capability are standardized, but the weatherability is not established. Though the construction sealants are influenced by weathering from static to dynamic conditions, many studies of sealant for the weatherability is evaluated on static condition. Factors of sealant weatherability are compounded from degradation on static condition, effect of joint dynamic transformation and climate of region. Our purpose in this study is to demonstrate the quantitative effect of dynamic transformation for the weatherability of sealants by using newly devised testing method.
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苅谷 健司, 横山 裕
原稿種別: 本文
2007 年 72 巻 619 号 p.
33-40
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This study is continued from Part 3, the method of aging simulation with orthotic devices was applied to estimate the effect of the aging for multiple residential environments' arranging related to the movement of standing up and sitting down, stepping up and down. As the result, changing C.S.R effects on the case of one side handrail attached more than the case of both sides handrails attached like armrest or parallel bars especially for the aged. Moreover, changing C.S.R effects on similarly in all height of seat or step.
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安井 八紀, 大熊 武司, 丸川 比佐夫
原稿種別: 本文
2007 年 72 巻 619 号 p.
41-48
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This study proposes analytical methods for determining wind responses of base-isolated high-rise buildings with creep deflection and clarifies characteristics of their modal forces and responses. The following results are derived. Modal forces on a base-isolated building are calculated easily by multiplying those on a conventional building with a linear mode shape function by the proposed mode shape correction factor. It is shown that the proposed methods for determining wind responses of base-isolated high-rise buildings with creep deflection are appropriate. Creep deflections are insensitive to fluctuating wind forces, so creep deflections and wind responses can be calculated separately. Shifts of the mean wind response of a base-isolated building due to plastic characteristics of isolation devices occur, but they behave almost elastically in the along-wind direction. However, the isolation layer moves inelastically in the across-wind and torsional directions. The standard deviation response calculated from the wind force for a certain direction is equal to or greater than that derived from 3 components of wind forces simultaneously. However, the mean response considering the former is smaller than that considering with the latter.
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佐口 浩一郎, 元木 健太郎, 瀬尾 和大
原稿種別: 本文
2007 年 72 巻 619 号 p.
49-56
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Significant later phases following the S-wave arrivals in horizontal components often appear in the ground motions recorded in the sedimentary plain. In this paper, we discuss the propagation process of ground motions generated by a shallow earthquake through the analysis of seismograms recorded on rock and sediment sites. To accomplish it, we first deployed a temporary stations for seismic refraction prospecting to clear up the boundary between the mountain range and the edge of the sedimentary plain in the southwestern edge of the Kanto Plain. Accordingly, we employed the recordings of seismic waves generated by explosions to model the subsurface structures applying travel time analysis. We also applied 2D finite difference method to simulate the later phases during an earthquake observed at the sediment sites using the subsurface structures derived from the seismic prospecting process. The results indicate that when considering basin-excited waves, the characteristics of the simulated waveforms including the later phases display good agreement with the observed seismograms.
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小林 正人, 佐藤 永, 堀江 裕一郎, 洪 忠憙
原稿種別: 本文
2007 年 72 巻 619 号 p.
57-64
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This paper is to clarify the relation between the arrangement of the velocity-dependence type dampers and the response distribution of the relative story displacement by random vibration analysis with frequency response function. At first the Influence of the velocity dependency of damper resistance force on the relative story displacement is shown by random vibration analysis using two-mass-system. Then the response mechanism of high-rise buildings with damper arrangement, which makes the relative story displacement to a target value or less, is analyzed by the power spectrum of relative story displacement.
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桐田 史生, 金澤 健司, 森清 宣貴, 北村 春幸
原稿種別: 本文
2007 年 72 巻 619 号 p.
65-72
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This paper presents a new system identification procedure for a time-varying system to estimate natural frequency transition of a building from a strong seismic motion record, named as "Adaptive Forward-Backward Kalman Filter (AFB-KF)". The AFB-KF is compared to the conventional Kalman Filter in the below three points: (1) Forgetting factor for covariance functions to track time-varying structural parameters rapidly, (2) Time-backward estimation scheme and global iteration scheme of the forward and backward processes to estimate unknown initial value of structural parameters, (3) The time series renewal algorithm of statistical properties by reflecting the previous analysis information to improve the identification accuracy. It is useful to accurately identify from natural frequency transition of a building during an earthquake for structural health monitoring which evaluates structural integrity.
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藤井 大地, 谷澤 毅
原稿種別: 本文
2007 年 72 巻 619 号 p.
73-79
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In this paper, a topology optimization method to create damping mechanism of a building is shown. The topology is created on continuum divided in finite elements. In the optimization problem, the densities of the elements are chosen as design variables. The stiffness between the input point and the output point is maximized under the constraints of the displacement of the output point, the relativity displacement of the output point and input point, and the material usage. The optimization problem with different initial design variables is solved using the SLP optimizer, because the solution of this problem depends on the initial design variables. The initial design variables are given by random numbers. Some examples are shown to demonstrate the effectiveness of the present method.
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松井 徹哉
原稿種別: 本文
2007 年 72 巻 619 号 p.
81-88
発行日: 2007/09/30
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A computational method based on coupled FE (finite element) and analytical solutions is proposed for predicting the sloshing response of a floating roof in a cylindrical liquid storage tank subjected to seismic excitation. The liquid is assumed to be inviscid, incompressible and irrotational, while the floating roof is considered as an orthotropic elastic plate of arbitrary axisymmetric form. The method of solution is based on applying the FEM to evaluate the free vibration modes of the floating roof in air into which the response of the floating roof is expanded. The liquid-floating roof coupling analysis is then performed semi-analytically based on linear potential theory. The method is easier to apply and computationally more efficient than the conventional 3-D analysis based on FE modeling for both the floating roof and the liquid. Numerical results are presented to illustrate the applicability of the proposed method and to investigate the effect of rib-stiffening on the sloshing response of rib-stiffened floating roofs.
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桝井 健, 八尾 眞太郎
原稿種別: 本文
2007 年 72 巻 619 号 p.
89-95
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Model tests were performed in order to obtain collapse behavior of TSUKIISHIBU section in masonry walls under long-term load; the TSUKIISHIBU section represents the whole part of the masonry wall structure excluding corner. A wall model was constructed by rectangular prism shaped masonry stones placed one on another with initial angle of slope on dry sand backfill, and the angle of slope was increased quasi-statically until the model collapses. It is observed that when the initial angle of slope is steep the model collapses with overturning mode of the wall and when the initial angle of slope is relatively mild the model collapses as if the wall was bending at the middle height. As wall heights that the model collapse show good agreement with critical slope curves those are theoretically obtained, validity of the theory for predicting critical height of the wall is clarified.
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竹内 徹, 熊谷 知彦, 調 浩朗, 小河 利行
原稿種別: 本文
2007 年 72 巻 619 号 p.
97-104
発行日: 2007/09/30
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Seismic responses of raised lattice roofs are known to be different from those of multistory structures, which include vertical response even against horizontal input, and their amplitudes are affected by the stiffness of supporting structures. Especially when the own period of the roof meets that of substructures, the response of the roof is known to be significantly amplified. In this paper, seismic response of latticed arches, cylindrical shells, and domes on multistory structures are studied including their amplification factors, followed by proposing simple evaluation method which is consistent with contemporary design method of multistory buildings.
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藤井 雅也, 松本 慎也, 村上 雅英, 杉本 敏和, 井上 隆二, 完山 利行, 小松 幸平
原稿種別: 本文
2007 年 72 巻 619 号 p.
105-110
発行日: 2007/09/30
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The general influence of long term load upon shear behavior of nailed shear walls was confirmed in in-plane shear test of the shear walls in which the devices to measure the axial force acting on the bottom reinforcements were installed. The 24 experimental parameters are decided by the combination of presence of nailing on sill through sheet, connection types between columns and sill, and the several magnitude of long term loads. The formulae to calculate the shear resistance corresponding to the apparent shear strain of 1/120 rad. and the maximum shear resistance were derived considering the influence of long term load. The formulae were experimentally examined for their validity.
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桑村 仁
原稿種別: 本文
2007 年 72 巻 619 号 p.
111-118
発行日: 2007/09/30
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Splitting of timber is a critical issue in steel-framed timber structures, because the connection force acts perpendicular to wood grains. In the history of wood engineering, the splitting behavior of notched beams was first studied and was followed by many other types of splitting. However, the mechanism is not yet clarified. In this paper, the original model for splitting invented by Sugiyama was reviewed, on the basis of which a revised model is proposed in order to establish formulae for calculating the splitting stresses in notched beams. The validity of the formulae was examined by means of past experiment and modern FEM analysis. It is found that the formulae for splitting stresses are practically admissible in the prediction of splitting load of notched beams.
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蒲池 健, 安藤 直人, 稲山 正弘, 村上 雅英
原稿種別: 本文
2007 年 72 巻 619 号 p.
119-126
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This research is concerned with lateral resistance of double shear bolted timber-to-timber joints. Assuming a bolt as a beam on the elastic foundation and using the Weighted Tesidual Method, the deflection curve of the bolt was obtained as the useful polynomial. Then the initial slip modulous of the joints was approximately conducted. In addition, taking advantage of obtaining the maximum moment as closed form, proportional limit load, yield load and secondary modulous was conducted. This method is useful to consider the limit state of the joints. Subsequently, the validity of our hypothesis was verified by a series of experiments.
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加藤 大介, 李 柱振, 中村 友紀子, 本多 良政
原稿種別: 本文
2007 年 72 巻 619 号 p.
127-132
発行日: 2007/09/30
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Standard for evaluating method of seismic performances of existing R/C buildings revised in 2001 showed evaluating methods of residual axial load capacity and axial load capacity, which had dramatic effects on seismic performance indexes. In this study the feasibility of this method was discussed using experimental data. For this purpose static loading tests of R/C columns were conducted. Main variable was loading methods; i.e. monotonic eccentric axial loading, eccentric axial loading under constant lateral drift and normal reversed lateral loading under constant axial load. An evaluating method of residual axial load capacity was proposed and compared with the standard.
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清水 克将, 金久保 利之, 閑田 徹志, 永井 覚
原稿種別: 本文
2007 年 72 巻 619 号 p.
133-139
発行日: 2007/09/30
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In this research, PVA-ECC (Engineered Cementitious Composites with Polyvinyl alcohol fiber), which is one of the composites showing pseudostrain hardening behavior in uniaxial tension, is focused. Method of single plane shear test under tensile stress as normal stress on crack surface is conducted to clarify shear transfer mechanism on crack surface. From the test results, tensile shear strength on crack surface is about half of uniaxial tensile strength. This means that normal stress for crack surface is possible to keep tensile strength under shear. Predicting method for shear strength of beams is proposed based on multiplying the reduction coefficient for tensile strength obtained from evaluation of tensile properties using bending test. The reduction coefficient derived from beam test results is 0.41.
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中村 孝也, 芳村 学, 見波 進
原稿種別: 本文
2007 年 72 巻 619 号 p.
141-148
発行日: 2007/09/30
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Substructure pseudo-dynamic tests were conducted to simulate story collapse of old three-story R/C buildings. The buildings were idealized to consist of a single column line and rigid beam. The first-story column that was designed to fail in shear was tested by the substructure pseudo-dynamic method where the second- and third-story columns designed enough strong were assumed elastic. An imaginary mass was determined in such that the first mode period and Seismic Capacity Index, Is, might result in 0.15 second and 0.49, respectively. Three earthquake records were used as input motions. Responses of the buildings, mostly those in the post-peak regions including collapse were studied.
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塩屋 晋一, 當房 和博
原稿種別: 本文
2007 年 72 巻 619 号 p.
149-156
発行日: 2007/09/30
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In previous work, the authors presented that the joint between spandrel walls and column was observed to reduce significantly the shear capacity of column at a experimental test data. The reduction is defined as the reduction ratio in shear strength to them of columns of which the column heigth is equal to the opening height from lower spandel wall top to upper bunging wall bottom. This paper clarifies the reductions in shear strength of column, based on other research data found in the literature and authors' additional experimental test data. The reduction ratio in shear strength is approximately 70% to 90%. A formula to predict the reduction ratio is suggested herein.
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田川 浩, 劉 翠平
原稿種別: 本文
2007 年 72 巻 619 号 p.
157-164
発行日: 2007/09/30
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In wide-flange steel column-to-beam connections reinforced with transverse stiffeners, local strength of beam-flange to column connections is generally obtained considering local web yielding of the column. However, when the beam-flange width is close to the column flange one, the local flange bending of columns possibly appears in the connections with rather thin stiffeners. This leads to the reduction of stiffener strength. In this paper, strength formulae of local flange bending of columns with transverse stiffeners are derived considering two types of collapse mechanisms by applying the yield line theory. The accuracy of derived strength formulae is examined through loading tests and finite element analysis. The measured strain distributions and residual flange deformations confirm the validity of collapse mechanisms considered. The simplified and conservative strength formula is proposed for the stiffener design. The applicable range of the formula is also discussed.
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城戸 将江, 津田 恵吾
原稿種別: 本文
2007 年 72 巻 619 号 p.
165-170
発行日: 2007/09/30
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Required bracing stiffness to give the specified effective length factor of columns in symmetrical braced frames is calculated by using the buckling slope-deflection method. Formulas to evaluate required bracing stiffness are shown in the following cases: 1) to take the effective length factor which is equivalent to the one when the sidesway is prevented, 2) to take any effective length factor and 3) to take the effective length factor as unity.
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竹内 徹, 宮崎 健太郎, 岩田 衛
原稿種別: 本文
2007 年 72 巻 619 号 p.
171-178
発行日: 2007/09/30
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Cumulative deformation capacity is one of the most important benchmark for the performances of elasto-plastic dampers within vibration-controlled buildings built in seismic area, because this value is considered to be related deeply to the cumulative energy dissipation capacity and validity life of the dampers. However, estimating this value is not easy because they are affected by loading histories. Following previous study proposing simple prediction equations which can estimate cumulative deformation capacities and energy dissipation capacities of budding-restrained braces placed in elastic frames, validity of those method is confirmed by mock-up experiments, and analyses where frames are going into plastic zone.
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金子 佳生, 三橋 博三, 桐越 一紀
原稿種別: 本文
2007 年 72 巻 619 号 p.
179-185
発行日: 2007/09/30
公開日: 2017/02/25
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In this paper, a simple junction column base system in steel structures is experimentally studied. The column base is encased by filling steel fiber reinforced cementitious composites. In the test, cantilever column specimens are adopted for the proposed system, and cyclic load is applied. The results show that the proposed system gives enough stiffness, strength and ductile hysteresis characteristics. In addition, a joint-spring model based on a mechanical model for the macroscopic shear failure of concrete is applied to the structural experiments, resulting in the good agreement between the experimental results and the analytical prediction.
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山口 信, 村上 聖, 武田 浩二, 三井 宜之
原稿種別: 本文
2007 年 72 巻 619 号 p.
187-194
発行日: 2007/09/30
公開日: 2017/02/25
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When designing explosive-resistant concrete structures, reducing brittle spall due to reflected tensile stress wave is the most important problem. In order to apply high-toughness fiber-reinforced concrete to explosive-resistant structures, experimental investigations were conducted regarding evaluation of the damages in polyethylene fiber-reinforced concrete (PEFRC) slabs subjected to contact detonation. As a result, it was shown that the PEFRC was very effective in reducing spall due to detonation as compared with normal concrete. Moreover, the formulation estimating the damage depth in the PEFRC slab subjected to contact detonation was derived based on the test results.
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原稿種別: 付録等
2007 年 72 巻 619 号 p.
App68-
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原稿種別: 付録等
2007 年 72 巻 619 号 p.
App69-
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原稿種別: 表紙
2007 年 72 巻 619 号 p.
Cover35-
発行日: 2007/09/30
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原稿種別: 表紙
2007 年 72 巻 619 号 p.
Cover36-
発行日: 2007/09/30
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