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更谷 安紀子, 水谷 友紀, 焦 鍵, 林 康裕
2012 年 18 巻 39 号 p.
427-430
発行日: 2012/06/20
公開日: 2012/06/20
ジャーナル
フリー
Considering the seismic hazard of locality and aging deterioration of a building is indispensable, to estimate the effectiveness of Earthquake countermeasures for a big earthquake assumed to occur dozens of years later, to investigate necessity of maintenance to make an building of high performance for long life. Therefore this paper suggest the idea of earthquake countermeasures for local wooden house through the case study for traditional wooden houses by using a previous seismic risk evaluation technique that can consider durability and deterioration of a building.
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喜々津 仁密, 吉田 昭仁, 前田 豊, 西村 宏昭, 岡田 恒
2012 年 18 巻 39 号 p.
431-436
発行日: 2012/06/20
公開日: 2012/06/20
ジャーナル
フリー
The methods of structural test and evaluation applicable to steel wall system were developed in order to verify wind-resistant performance of the system. They were incorporated in the Standard of Steel Wall (SSW2011). The authors developed the methods in the viewpoint of performance-based structural design so that the concept of structural verification using them follows Building Standard Law of Japan. This paper outlines the detail of the proposed methods along with technical backgrounds.
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池永 昌容, 由川 太一, 長瀬 拓也, 五十子 幸樹, 井上 範夫
2012 年 18 巻 39 号 p.
437-440
発行日: 2012/06/20
公開日: 2012/06/20
ジャーナル
フリー
Force restriction of the tuned viscous mass damper is considered using a friction slider. From a series of shaking table tests, it is shown that the restriction mechanism can effectively reduce the damper maximum force, and the maximum displacement of a primary system incorporated with the force restricted damper is almost the same as that with a restriction-free damper. The simulation analysis results show good agreement to the experimental results, and the relationship between the ratio of the force restriction and the maximum displacement is examined by the analyses.
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杉村 義文, 後藤 航, 谷沢 弘容, 永作 智也, 斎藤 堅二郎, 二宮 利文, 斉藤 賢二
2012 年 18 巻 39 号 p.
441-446
発行日: 2012/06/20
公開日: 2012/06/20
ジャーナル
フリー
Response control using inertial mass element which gets inertial force due to the relative acceleration is recently studied by many researchers. The authors have proposed a new seismic response control system, the tuned viscous mass damper (TVMD), composed of arranging viscous damping element and inertial mass element which has an apparent mass amplifying mechanism to obtain a large supplemental mass effect in parallel and connecting spring element in series. This paper shows the application of TVMD to a high-rised steel building structure and response control effect of this system.
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下薗 真志, 北村 春幸, 桐山 周
2012 年 18 巻 39 号 p.
447-452
発行日: 2012/06/20
公開日: 2012/06/20
ジャーナル
フリー
The 2011 off the Pacific coast of Tohoku earthquake generated the main shock with long-duration and long-period and the magnitude 7.0 class aftershocks many times in a wide range of eastern Japan. The horizontal displacement response of the isolated building caused by them was about 0.4 m. They damaged seismic isolated dampers such as steel dampers and lead dampers. This paper presents to evaluate responses of isolated buildings and the damage of seismic isolated dampers by results of response analysis using simple isolated building model under bi-axial horizontal loading in main shock and aftershocks observed at 6 points from Aomori to Tokyo.
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田村 和夫, 金子 美香, 北村 春幸, 斉藤 大樹
2012 年 18 巻 39 号 p.
453-458
発行日: 2012/06/20
公開日: 2012/06/20
ジャーナル
フリー
The authors conducted a questionnaire survey to the residents of super high-rise residential buildings in Tokyo, on the responses of them due to the 2011 off the Pacific coast of Tohoku Earthquake. The important results are: (1) Due to the large shaking amplitude, residents’ behavior was considerably affected. (2) The furniture overturned or moved severely, especially on the upper floors of tall buildings which have less than twenty stories, in the conventional structures’ cases. In the base isolated buildings, the damage was much smaller than that of conventional ones.
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鈴木 光雄
2012 年 18 巻 39 号 p.
459-464
発行日: 2012/06/20
公開日: 2012/06/20
ジャーナル
フリー
Velocity-dependent dampers have high ability to control responses for not only large but also small vibration. The direction of deformation in these dampers is generally limited to one direction. In the case that direction of damper’s axis coincides with direction of excitation, damper dissipates energy most efficiently. However in practice it is relatively rare that the direction of damper’s axis coincides with that of excitation. This paper presents that the energy dissipation of velocity-dependent dampers that have nonlinear relationships between velocity and damping force is greatly influenced by difference in excitation.
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渡壁 守正, 飯塚 信一, 稲井 慎介, 石岡 拓, 高井 茂光, 金川 基
2012 年 18 巻 39 号 p.
465-470
発行日: 2012/06/20
公開日: 2012/06/20
ジャーナル
フリー
The failure of the large suspended ceiling systems has been one of the most widely reported types of nonstructural damage in building structures in past earthquakes. The results of shaking tests at some input levels showed the dynamic characteristics of the suspended ceilings and some ceiling specimens were damaged in a form which will lead to a successive collapse of a large suspended ceiling. This paper discusses an effective method of the clip connections which are developed to reduce the likelihood of the ceiling failure.
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南 博之, 鈴木 恭平, 多幾山 法子, 大西 良広, 林 康裕
2012 年 18 巻 39 号 p.
471-476
発行日: 2012/06/20
公開日: 2012/06/20
ジャーナル
フリー
The objective of this paper is to analyze the effect of deformation control systems against pulse-like ground motions. In this paper, we carried out time history response analysis for the models of the equivalent SDOF system and the MDOF system equipped with hysteretic dampers, viscous dampers and stoppers. As a result, the following conclusions are obtained. 1) Against the maximal pulse-like ground motion, it sometimes happens that the additional hysteretic dampers increase the maximum story drift angle. 2) In all the cases, the additional viscous dampers decrease the maximum story drift angle. 3) Equipped with stoppers, there is a possibility to control unreasonable deformation against maximal pulse-like ground motions.
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添田 幸平, 佐藤 大樹, 北村 春幸, 石井 正人, 吉江 慶祐, 宮崎 充, 佐々木 和彦, 岩崎 雄一
2012 年 18 巻 39 号 p.
477-482
発行日: 2012/06/20
公開日: 2012/06/20
ジャーナル
フリー
There are few researches in the combinations of dampers with different performances in vertical direction. The authors proposed the “combination-system” which is constructed of hysteretic dampers arranged in the lower stories of the building and viscous dampers arranged in the upper stories. This paper presents earthquake response characteristics of “combination-system” based on time-history analysis results. In addition, this paper describes the effect of the arrangement pattern of dampers and an amount of each damper to vibration control effect of building. This system can absorb the seismic energy compared with the one type of damper system.
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(その2.粘弾性ダンパーシステムを柱に内蔵した実大フレームの静的載荷実験の結果)
泉澤 喬, 高橋 孝二, 飯塚 信一, 山下 忠道, 梁川 幸盛, 田中 和宏
2012 年 18 巻 39 号 p.
483-488
発行日: 2012/06/20
公開日: 2012/06/20
ジャーナル
フリー
In this paper, a new outer-frame system is proposed to retrofit the existing building. The outer-frame system consists of a Visco-Elastic Damper and an Axial Force Transfer Mechanism. To make clear the mechanism of the outer-frame system, static tests of full-scale frame model were conducted. Additionally, the frame analytical model is proposed for structural design. As a result of static tests, the hysteresis characteristics of the outer-frame system show the stable characteristic, and energy absorption performance increases according to a deformation angle. The proposed analytical model can be approximated with sufficient accuracy compared with result of static tests.
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平井 宏幸, 吉江 慶祐, 佐藤 大樹, 片桐 純治, 鶴見 俊雄, 北村 春幸, 大熊 武司
2012 年 18 巻 39 号 p.
489-494
発行日: 2012/06/20
公開日: 2012/06/20
ジャーナル
フリー
In evaluation of wind-induced responses through time-history analysis based on stationary random process, its responsive value must be dealt with numerous numbers of statistics. However, the designing value is often determined from the small number of samples because of limited time and expense in practice. Therefore, it is important and necessary to grasp dispersion of wind response from small number of samples.
In this paper, the dispersion of wind forces and wind-induced responses are investigated from wind tunnel tests. Then, the influence on wind responses due to the difference in the number of samples used as an ensemble average is elucidated.
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冨永 晃司, 伊藤 淳志
2012 年 18 巻 39 号 p.
495-498
発行日: 2012/06/20
公開日: 2012/06/20
ジャーナル
フリー
Winkler model is widely used in the analysis of foundations. It is usually employed in the transfer matrix method for analysis of laterally loaded piles, but it is difficult to take account of the model in the stiffness matrix of the grid beam structures. On the other hand, since in the stiffness matrix the soil supporting beams is modeled by only concentrate springs, many elements are needed to obtain the correctness of calculated quantities. The authors present the convenient method transforming from the transfer matrix to the stiffness matrix for the analysis of the grid beam structure on the soil.
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田淵 敦士, 内田 保博, 石倉 龍人
2012 年 18 巻 39 号 p.
499-504
発行日: 2012/06/20
公開日: 2012/06/20
ジャーナル
フリー
In this study, composite beams with timber and steel were tested and its strength was evaluated using superimposed strength and ultimate strength theory. Four types of specimens were as follows: (A) Timbers reinforced with lag screws(LS6) 50mm pitch, (B) timbers with steel plates (PL3.2) 3.2mm thickness put on top and bottom sides, and fasten with lag screws 50mm pitch, (C) timbers of (B) with cover woods on top and bottom sides, (D) no reinforced timbers. These specimens were experimented by three-point bending test. As the result of this experiment, it was found that 1)steel plates reinforced a timber beam effectively, 2)ultimate bending strength of B-series and C-series could be evaluated by superimposed and ultimate strength theory.
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中島 昌一, 北守 顕久, 小松 幸平
2012 年 18 巻 39 号 p.
505-510
発行日: 2012/06/20
公開日: 2012/06/20
ジャーナル
フリー
The lattice shear wall consists of the combination of square section lumbers. In this paper, authors developed the lattice shear wall which is composed of logs as columns and steel pipes as
nuki. Its structural performance was estimated by mechanical model and confirmed by strength tests.
Due to the high transversal compression stiffness of the steel pipe
nuki in compared to the lumber
nuki, the developed shear wall showed the higher mechanical properties than the general lattice shear wall.
In addition, it was possible to make initial slackness relatively smaller without using wedges by laterally compressing steel pipes after assembly.
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南 宗和, 鄭 基浩, 北守 顕久, 森 拓郎, 小松 幸平
2012 年 18 巻 39 号 p.
511-516
発行日: 2012/06/20
公開日: 2012/06/20
ジャーナル
フリー
The system enabling to build the shear walls using Japanese cedar planks more ductile, resistant and easy than the conventional method, was studied. New fasteners to connect planks on shear walls were developed by utilizing the compressive strength of wood in parallel to the grain and four types of shear walls were made for the full-scale shear tests. As a result, S.R.F with 1P-size shear walls were found to be 2.4, 3.2 and 2.5 and also Shear Resistance Factor with 2P-size one was 2.7. All the shear walls have been found with the high ductile performance of over 1/15 radian.
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渡部 昌弘, 藤田 香織, 千葉 一樹
2012 年 18 巻 39 号 p.
517-522
発行日: 2012/06/20
公開日: 2012/06/20
ジャーナル
フリー
It is well known that timber buildings often suffer damages under maximum earthquakes and some problems of existing non-conformity buildings in Japan have to be solved. In this paper, we choose a certain temple in Tokyo, for which a base-isolated retrofit is constructed, to reveal its own structural properties. We make seismic diagnoses including limit strength calculations. We also conduct micro-tremor measurements and earthquake response analyses.
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朴 志泳, 田中 圭, 井上 正文
2012 年 18 巻 39 号 p.
523-528
発行日: 2012/06/20
公開日: 2012/06/20
ジャーナル
フリー
In Japan, whenever the severe earthquake occurred, many residents were injured or died by the collapse of old wooden houses with poor seismic strength. However, the seismic strengthening for existing wooden house is not carried out in Japan. The reasons why the resident dose not carried out seismic strengthening are high cost, long work period and so on for retrofit works. We developed the new seismic strengthening method by the thick plywood with openings; the high wall strength performance was obtained by the proposed strengthening method. In this study, the horizontal loading tests for some kinds of thick plywood with openings were carried out.
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細矢 博, 松本 匡史, 金久保 利之, 八十島 章
2012 年 18 巻 39 号 p.
529-534
発行日: 2012/06/20
公開日: 2012/06/20
ジャーナル
フリー
Research and development on a new precast concrete system that beam-column joints are manufactured as the precast concrete has been conducted for the purpose of more efficient use of precast concrete technology. In this study, the loading test is conducted for beam-column joint specimens to investigate the structural performance. From the test results, no large differences between precast and cast-in-situ specimens can be found out in terms of failure progress, shear force - drift angle curve, deformation components and damping factor. It can be recognized that the structural performance of precast beam-column joints shows the same performance of cast-in-situ joints.
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高瀬 裕也, 池田 隆明, 鈴村 武志, 妹尾 嘉章, 阿部 隆英, 久保田 雅春
2012 年 18 巻 39 号 p.
535-540
発行日: 2012/06/20
公開日: 2012/06/20
ジャーナル
フリー
In the 2011 off the Pacific Coast of Tohoku Earthquake, many seismic retrofitted buildings were subjected to strong motion. The 10-story residential building that was retrofitted using damping system with amplifier mechanism was one of these buildings. In order to verify the effect of seismic retrofitting, we investigated the building condition and calculated story drift angle by seismic response analysis. As a result, the safety of this building was confirmed. Furthermore, we verified when partial walls were in failure using the modified compression field theory. It is concluded that the effect of partial walls on structural performance was less.
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小幡 昭彦, 西田 哲也, 菅野 秀人, 小林 淳, 三浦 伸
2012 年 18 巻 39 号 p.
541-546
発行日: 2012/06/20
公開日: 2012/06/20
ジャーナル
フリー
In regions with heavy snowfall, such as Akita, the primary load on the structural design of school gymnasiums is the snow load. However, for recording heavy snowfall, the regional distribution of the snow load is modified. As a result, the amount of snow load to be considered in the seismic diagnosis of gymnasiums is not clear. Occasionally, these gymnasiums are unable resist the long-term load during heavy snowfall.
In this study, the annual transition of the snow load on a structural design was investigated using the past records for a prefecture and a self-governing body.
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五十嵐 規矩夫, 富岡 義人, 村上 翔, 宮司 典弘, 田端 千夏子
2012 年 18 巻 39 号 p.
547-552
発行日: 2012/06/20
公開日: 2012/06/20
ジャーナル
フリー
The authors designed an innovative steel skin roof, of which considerable amount of tension is introduced into the surfaces. By conducting the structural experiment of two stages, inflation test and loading test on a specimen of a practical size (span:10.8m), structural performances of the roof are evaluated in this paper. The principal conclusions are as follows: 1) A simple formula was proposed to express progresses of tensional stress during inflation. 2) The specimen showed strength increase as well as considerable deformability even after the backup folded plate suffered local buckling. 3) Structural feasibility was showed by carrying out an allowable stress design on temporary load.
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金田 勝徳, 竹内 徹, 高橋 邦広, 得能 将紀, 木村 祥裕, 和田 章
2012 年 18 巻 39 号 p.
553-558
発行日: 2012/06/20
公開日: 2012/06/20
ジャーナル
フリー
The authors have proposed mid-floor leveled column base system. The first story columns consist of the reinforced concrete downside column and the steel topside column, and their joints with the anchor bolts and the shear plates are supposed to be pinned. In this paper, the building designed by using mid-floor leveled column base system of applicability and seismic performance are studied. In order to compare mid-floor leveled column base system and conventional column base system, the building designed by using exposed type column base and embedded type column base are studied.
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服部 明生, 玉井 宏章, 高松 隆夫, 山西 央朗, 小澤 吉幸
2012 年 18 巻 39 号 p.
559-564
発行日: 2012/06/20
公開日: 2012/06/20
ジャーナル
フリー
To enhance the usable life of existing steel buildings, a strengthening method with bonding continuous fiber reinforced plastics (FRP) plates has been developed by authors. Deep corrosion was observed in a chemical plant frame bleached in chemical atmosphere for a long term. 40% lack of beam thickness was confirmed in the frame. The frame is appointed in an explosion-protection area, and a constructer cannot use fire during rehabilitation and repair.
Therefore a strengthening method with bonding CFRP was adopted. In this paper the progress of rehabilitation by bonding CFRP plates are introduced.
Also, this paper reports the results of bending tests conducted on secondary beams in chemical plant frame before and after rehabilitation using CFRP plates.
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藤本 利昭, 小松 博, 櫻田 智之, 師橋 憲貴, 三橋 博巳
2012 年 18 巻 39 号 p.
565-570
発行日: 2012/06/20
公開日: 2012/06/20
ジャーナル
フリー
Concrete encased steel composite column with steel jacket using recycled concrete is proposed by the authors, and is being conducted continuous studies to make it practical. This paper discusses how to evaluate the axial strength of full scale columns. It is revealed based on the test results that the AIJ design formulas for SRC structures can be applied for evaluating the axial strengths of these columns. Furthermore, improved design formula to estimate the axial strength is proposed for these columns considering scale effect of concrete and local buckling of steel jacket.
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立川 剛, 宿里 勝信, 矢尾 誠
2012 年 18 巻 39 号 p.
571-574
発行日: 2012/06/20
公開日: 2012/06/20
ジャーナル
フリー
Our research group members mainly consisting of university researchers and students have done strenuous volunteer activities for the KAGUTENBOU to provide furniture fixing service for homes. The major factors of the human damage in the previous earthquakes were attributable to the building collapsing and furniture tipping. Fixing furniture is the minimum environmental improvement that has to be quickly undertaken against future major earthquakes.
This paper reports the questionnaire survey that we conducted on the residents’ awareness of and preparation for disasters, and the analysis of the survey result, the extracted issues and our activities to solve them.
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田中 栄次, 寺田 岳彦, 櫻庭 記彦, 内本 英雄, 小川 雄一郎, 室田 文男
2012 年 18 巻 39 号 p.
575-578
発行日: 2012/06/20
公開日: 2012/06/20
ジャーナル
フリー
A significant amount of research on Tohoku earthquake in 2011 reported the damages to nonstructural components. However, the survey on structural characteristics and seismic performance of nonstructural partition wall is scarce. In this paper, we carried out anti-plane static loading tests on partition walls with light-gauge steel and confirmed their behaviors and strength. In addition, their dynamic properties were estimated based on the results.
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肥田 剛典, 永野 正行
2012 年 18 巻 39 号 p.
579-584
発行日: 2012/06/20
公開日: 2012/06/20
ジャーナル
フリー
A questionnaire survey about shaking and damages of the super high-rise RC buildings during the 2011 off the pacific coast of Tohoku earthquake was conducted for the residents. The survey was conducted for 15 super high-rise residential buildings in the Kanto and the Kansai areas in late July 2011, about 4 month after the main shock. The following conclusions were reached; (1) The anxiety during the main shock tends to be higher than the action difficulty with same questionnaire seismic intensity. (2) The relationship between questionnaire seismic intensity and the damages to the interior materials and the concrete member showed an inverse correlation. (3) The questionnaire seismic intensity and the action difficulty, the tendency of damage situations to the interior materials and concrete member differ between 2 buildings which are close to each other. (4) The building that built at an area where significant liquefaction had occurred suffered relatively-great damages. (5) At the lower part of the buildings, many residents heard a squeak sound of building during the main shock or the aftershock.
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竹田 浩彰, 藤田 正則, 前田 親範, 村井 正敏, 岩田 衛
2012 年 18 巻 39 号 p.
585-588
発行日: 2012/06/20
公開日: 2012/06/20
ジャーナル
フリー
To reduce the global environment load, a sustainable building structure system (SBS), which is one of the damage control structures, has been researched and developed. However it is difficult for this system to apply conventional facade panels in case of a huge earthquake. In this study, the authors propose a new facade panel system that suits to large story deformation angle of the SBS. Basic performance of the proposed system is confirmed by experiments using scale-down model that have rotational pin and slipping connections.
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