AIJ Journal of Technology and Design
Online ISSN : 1881-8188
Print ISSN : 1341-9463
ISSN-L : 1341-9463
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Volume 23, Issue 54
Displaying 1-50 of 75 articles from this issue
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Materials and Construction
  • EXPERIMENTAL STUDY ON AIR-PERMEABILITY AND CARBONATION OF FULL SCALE MODEL OF CONCRETE WALL USING VARIOUS KINDS OF BINDING MATERIAL
    Akira NONAKA, Noboru YUASA, Shuzo OTSUKA, Shota ISHIWATA, Yoshihisa NA ...
    2017 Volume 23 Issue 54 Pages 357-362
    Published: 2017
    Released on J-STAGE: June 20, 2017
    DOIhttps://doi.org/10.3130/aijt.23.357
    JOURNAL FREE ACCESS
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    This research examined air-permeability of concrete mock test piece uses various kinds of binding material. The parameter of the experiment was various kinds of binding material, water binding material ratio, and an age of demold. When the water-cement ratio is small and the hydration is slow, the air-permeability is small. Influence of the age of demold was admitted only by the rapid air-permeation speed. The relation between the depth of neutralization and the air-permeability coefficient was able respectively to be shown by Portland cement, Portland blast-furnace slag cement, and Portland fly-ash cement in one line. However, coefficients of determination were smaller than the researches in the past.
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  • CONCRETE PROPERTIES OF COMPRESSIVE STRENGTH IN STRUCTURE WITH HIGH VOLUME BLAST FURNACE SLAG CEMENT
    Kazuhisa YODA, Tetsushi KANDA, Jinhwan JEON, Haruki MOMOSE, Hideki TAN ...
    2017 Volume 23 Issue 54 Pages 363-368
    Published: 2017
    Released on J-STAGE: June 20, 2017
    DOIhttps://doi.org/10.3130/aijt.23.363
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    Portland cement production dominates a major part of CO2 emission generated from construction materials and its reduction in terms of concrete is of particular significance. As a technical solution, the authors have been developing an HS concrete with a granulated blast furnace slag content as high as 65 percent for underground mass concrete constructions. In this paper, aiming at wider dissemination of massive HS concrete, the standard correction values of concrete compressive strength in structure (28SM91 value) were verified. The correction values of concrete strength in structure 28SM91 is 3N/mm2 through all season examined by statistics study.
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  • STUDY ON LOW SHRINKAGE CONCRETE USING BLAST-FURNACE SLAG FINE POWDER BLENDED CEMENT
    Haruki MOMOSE, Kohsuke ISHIZEKI, Tetsushi KANDA, Kei-ichi IMAMOTO, Chi ...
    2017 Volume 23 Issue 54 Pages 369-373
    Published: 2017
    Released on J-STAGE: June 20, 2017
    DOIhttps://doi.org/10.3130/aijt.23.369
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    The aim of this study is to experimentally investigate shrinkage properties of blast-furnace slag blended cement concrete (BLS-concrete, hereafter). For this purpose, restraint cracking tests for concrete were conducted at three ambient temperatures, 10 °C, 20 °C and 30 °C. The experiments showed that shrinkage cracking resistance of BLS-concrete was better than normal concrete regardless of ambient temperatures, and BLS-concrete had the same concrete strength development as normal concrete.
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  • INFLUENCE OF JOIST MEMBER SHAPE AND FORM EXTRUSION DIRECTION ON FORMWORK RIGIDITY:
    Mechanical property evaluation of insulated formwork made from extruded polystyrene foam (Part 2)
    Kyouzou FUKAZAWA, Seiji TAKAHASHI, Naochika KOGURE, Yoshinori SHIMOJYO ...
    2017 Volume 23 Issue 54 Pages 375-380
    Published: 2017
    Released on J-STAGE: June 20, 2017
    DOIhttps://doi.org/10.3130/aijt.23.375
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    We previously reported on the required mechanical characteristics and a deformation evaluation method for thermal insulators used in floor slabs directly above footing beams, and for formworks composed of extruded polystyrene foam that don’t require removal.
    In the present study, bending and bearing pressure experiments were conducted on a component specimen, focusing on (1) the bending stiffness of the formwork when the polystyrene foam extrusion direction is perpendicular to the formwork bearing span, and (2) the bearing stiffness against a square pipe used as a joist member.
    Moreover, a full-scale experiment was conducted using loads equivalent to those during actual construction, and it was confirmed that the foam formwork deformation during construction can be assessed based on the stiffness obtained from the component experiment.
    In this paper, the scope of the evaluation of foam formworks in the previous report is expanded based on the results of these experiments.
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  • INVESTIGATION OF REVIBRATING CONDITIONS WHEN DEFORMED BARS ARE IN CONTACT WITH INTERNAL VIBRATOR
    –Influence of difference in diameter of steel bar–
    Atsushi ITO, Yoshihisa NAKATA, Shuzo OTSUKA, Atsunori MIYATA, Naohiro ...
    2017 Volume 23 Issue 54 Pages 381-384
    Published: 2017
    Released on J-STAGE: June 20, 2017
    DOIhttps://doi.org/10.3130/aijt.23.381
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    In this study, influence of revibrating conditions on bond strength by changing diameter of steel bar were investigated. Parameters included diameter of steel bar, timing of revibration, duration of revibration and duration of contact between steel bar and internal vibrator. As a result, bond strength showed a decrease when diameter of steel bar is larger. And the influence of revibration and contact between steel bar and internal vibrator showed an increase when diameter of steel bar is smaller. This paper also proposed an appropriate method of revibration including difference diameter of steel bar.
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  • DEVELOPMENT AND APPLICATION OF ORGANIC SURFACE PREPARATION MATERIALS FOR EXTERIOR WALL TILING WITH ORGANIC ADHESIVES
    Masato YAMAMOTO, Hajime OKAMOTO, Hiromu TAKAHASHI, Michihiko MATSUBARA ...
    2017 Volume 23 Issue 54 Pages 385-390
    Published: 2017
    Released on J-STAGE: June 20, 2017
    DOIhttps://doi.org/10.3130/aijt.23.385
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    Exterior wall tiling using organic adhesives is expected to prevent tiles from separation because of its high elasticity, but generally mortar with poor elasticity has been used to smoothen irregularities of the concrete surface. We have developed an organic surface preparation material with higher elasticity than mortar, so that the tile layer could consist of all elastic materials. Various tests were carried out to evaluate mechanical properties and durability of the surface preparation material and the tiles adhered using this method. Test results showed that the material had enough strength and elasticity to meet JIS A 5557 criterion value. Test results also proved that the tiling had adequate deformational and fatigue property to improve the separation prevention performance.
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  • INVESTIGATION INTO U.S. OUTDOOR EXPOSURE TEST SITES AND EXPOSURE TEST RESULTS IN MIYAKO ISLAND, JPN AND SOUTH FLORIDA, U.S.
    Teruo KONDO, Makoto SUZUKI, Akira KONDO, Yoshimitsu GOTO, Nobuyuki SAT ...
    2017 Volume 23 Issue 54 Pages 391-396
    Published: 2017
    Released on J-STAGE: June 20, 2017
    DOIhttps://doi.org/10.3130/aijt.23.391
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    The weatherability evaluation with outdoor exposure test for building exterior materials is the most essential. The most standard outdoor exposure test site throughout the world is considered to be South Florida, US. Also the accelerated weathering test that gathers plenty of sunlight in dry condition is carried out in Arizona. The investigation into the actual conditions of these sites was held. The actual conditions of the tests and weather conditions in both sites have been grasped. Furthermore, outdoor exposure tests in Florida and Miyako Island, Japan had been carried out. All evaluated powder coating had been more notably deteriorated in Miyako than in Florida.
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  • PROPOSAL OF TESTING METHOD FOR CONCRETE STRENGTH USING EQUOTIP
    Akira NONAKA, Noboru YUASA, Kazuhiro MITANI, Seiji KANAMORI
    2017 Volume 23 Issue 54 Pages 397-402
    Published: 2017
    Released on J-STAGE: June 20, 2017
    DOIhttps://doi.org/10.3130/aijt.23.397
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    In this research, the applicability to the concrete of the echo chip was examined in the beginning. The content was examination of difference, influence of direction of measurement, and influence depth. The following examination is a method of presuming compressive strength from Equotip hardness value. The method of the estimate of compressive strength was requested from the relation between Equotip hardness value of flat test piece and compressive strength of cylinder test piece.
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  • DEVELOPMENT OF REPAIRING METHOD FOR LATH AND PLASTER CEILING
    Kentaro OKA, Masaki TAMURA, Osamu GOTO
    2017 Volume 23 Issue 54 Pages 403-408
    Published: 2017
    Released on J-STAGE: June 20, 2017
    DOIhttps://doi.org/10.3130/aijt.23.403
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    In recent years, it is necessary to secure the non-structural material in the event of a disaster. Lathing plaster ceiling of the traditional building is no exception. It is necessary to a healthy degree to properly evaluate respect for the value of such as culture, history, design, technology and authenticity of the traditional building. In this study, we have developed the repair method of existing ceiling by the acrylic resin. This technique does not require traditional skills. Therefore, to improve the health of the building at a low cost, it is possible to protect the history, culture, technology and safety.
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Structures
  • STUDY ON TORSIONAL RESPONSE OF SEISMICALLY ISOLATED BUILDING ON SOIL WITH INCLINED BEDROCK USING STRONG MOTION RECORDS
    Yoshinori TOBITA, Masayuki NAGANO, Haruyuki KITAMURA, Toshiaki SATO, K ...
    2017 Volume 23 Issue 54 Pages 409-414
    Published: 2017
    Released on J-STAGE: June 20, 2017
    DOIhttps://doi.org/10.3130/aijt.23.409
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    This report examined torsional response of a seismically isolated building on inclined bedrock using strong motion records. Ground motions increases the amplitude and produces time lag to propagate in according to a layer thickness of the surface ground. We also evaluate the torsional response using ratio of it. In result, torsional response of floor on seismically isolated layer is reduced to half by effect of it in comparison with basement.
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  • STUDY ON DYNAMIC CHARACTERISTICS OF SUPER HIGH-RISE RESIDENTIAL BUILDINGS BASED ON STRONG MOTION RECORDS AND AMBIENT VIBRATION AND VARIATION OF INTER-STORY STIFFNESS USING INTERMEDIATE FLOOR RECORDS
    Kei NARUSHIMA, Masayuki NAGANO, Takehiko TANUMA, Takenori HIDA, Hiroto ...
    2017 Volume 23 Issue 54 Pages 415-420
    Published: 2017
    Released on J-STAGE: June 20, 2017
    DOIhttps://doi.org/10.3130/aijt.23.415
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    Variation of 1st natural frequency of super high-rise residential buildings were investigated by using strong motion records during the 2011 off the Pacific Coast of Tohoku earthquake and ambient vibration records. Non-linear characteristics of two SRC buildings were similar to other super high-rise residential buildings. Based on analysis using intermediate floor records, inter-story stiffness at the lower layer has decreased from the increase of modal amplitude ratio of the middle floor to the top floor. Possibility for height-wise damage estimation is presented by performing microtremor measurements at plural floors.
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  • SEISMIC RESPONSE REDUCTION OF A HOUSE WITH IMPROVED COMPOSITE SOIL MATERIAL
    Marin UMAKOSHI, Yuji MIYAMOTO, Atsushi SHIMAMURA, Shinji NAKATA, Tatsu ...
    2017 Volume 23 Issue 54 Pages 421-426
    Published: 2017
    Released on J-STAGE: June 20, 2017
    DOIhttps://doi.org/10.3130/aijt.23.421
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    This paper addresses the developing of response reduction device of a detached house during earthquake. Reduction devices are composed of shear key and improved composite soil material, which are arranged between the seismic-isolated layers. The mechanical properties of the improved composite soil material are investigated by laboratory tests. Then we confirm the hysteresis characteristics of this system by shaking table tests. Furthermore we investigate the response reduction effects of a house with this device during earthquake by analytical studies.
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  • VERIFICATION OF DISPLACEMENT INTEGRATED FROM MEASURED ACCELERATION ON SHAKE TABLE EXPERIMENT OF FULL-SCALE GYMNASIUM SPECIMEN
    Tomohiro SASAKI, Daiki SATO, Rie SUZUKI, Hiroyuki TAGAWA, Atsushi AOI, ...
    2017 Volume 23 Issue 54 Pages 427-432
    Published: 2017
    Released on J-STAGE: June 20, 2017
    DOIhttps://doi.org/10.3130/aijt.23.427
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    In shake table experiments of structures, a lot of accelerometers are generally used to identify structural response while only a few displacement transducers are installed because large stiff frames are generally needed to measure displacement. Theoretically, displacement can be calculated from integrations of acceleration. However, low frequency components of measurement errors, noise and drift components resulted from permanent drift are amplified and unrealistic large displacement can be observed. To reduce low frequency errors, low-cut-filters are empirically used. This report discusses about errors of measured displacement and evaluates accuracy of the displacement resulted from integration of measured acceleration.
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  • PROPOSAL OF A DIRECT ESTIMATION METHOD FOR FLOOR RESPONSE SPECTRUM IN NON-LINEAR SEISMIC BEHAVIOR
    Tadashi ISHIHARA, Kohei SATO, Kento SUZUKI, Masayuki NAGANO
    2017 Volume 23 Issue 54 Pages 433-436
    Published: 2017
    Released on J-STAGE: June 20, 2017
    DOIhttps://doi.org/10.3130/aijt.23.433
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    The standard requires seismic design of specified ceilings under linear response of main frames caused by occasional earthquake motion. But it is preferable to check safety under non-linear response of main frames caused by rare earthquake motion. In this paper, a direct estimation method for non-linear floor response spectrum is proposed. The method is adapted one of linear modal analysis, composed of empirical formulas of non-linear response. By comparing seismic design forces for specified ceilings with those caused by rare earthquake motion, it is shown that specified ceilings with high natural frequency can avoid damage even under severe earthquakes.
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  • VIBRATIONAL CHARACTERISTICS OF REINFORCED CONCRETE BUILDING DURING DEMOLITION WORK (REDUCTION PROCESS)
    Takahito TSUCHIDA, Katsunobu YADORI, Takayoshi AOKI
    2017 Volume 23 Issue 54 Pages 437-440
    Published: 2017
    Released on J-STAGE: June 20, 2017
    DOIhttps://doi.org/10.3130/aijt.23.437
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    In this paper, we present the experimental results of a series of microtremor measurements of a RC building during demolition work (reduction process) in order to clarify their properties in dynamics. The RC building was reduced from 5 stories + 1 story penthouse to 4 stories. We conducted microtremor measurements before, during and after reduction process. Natural frequencies of the RC building were increased in accordance with its reduction process and strengthening works. Based on the equivalent single degree of freedom system, influence of weight reduction and stiffness increment on natural frequencies by reduction process and seismic strengthening is clarified.
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  • EVALUATION OF BUILDING VIBRATION CHARACTERISTICS BY SEQUENTIAL PARTIAL MEASUREMENT OF MICROTREMOR
    Aiko KURISU, Ryota MASEKI, Hiroshi HIBINO, Shigehiro SAKAMOTO, Ichiro ...
    2017 Volume 23 Issue 54 Pages 441-446
    Published: 2017
    Released on J-STAGE: June 20, 2017
    DOIhttps://doi.org/10.3130/aijt.23.441
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    Method to investigate the vibration characteristics of building by sequential two-point measurement of microtremor is proposed. The purpose of this method is to reduce the measurement cost compared to the conventional simultaneous measurement. By taking several patterns of two-point microtremor measurement and multiplying each transfer function, the elevational vibration mode is derived. By using the rotational spectrum of two-point on the same floor the rotational vibration mode is identified. Microtremor measurement is carried out on 9-storied office building in Yokohama, and the proposed method is verified to obtain the same result as conventional simultaneous measurement.
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  • ANALYSES OF DAMAGE FACTORS TO PILE FOUNDATIONS OCCURRED IN CHIBA PREFECTURE DURING THE 2011 OFF THE PACIFIC COAST OF TOHOKU EARTHQUAKE
    Osamu KANEKO, Reiko MORISHIMA, Toru SEKIGUCHI, Shoichi NAKAI, Tomohisa ...
    2017 Volume 23 Issue 54 Pages 447-452
    Published: 2017
    Released on J-STAGE: June 20, 2017
    DOIhttps://doi.org/10.3130/aijt.23.447
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    Static load increment analyses were carried out for the investigation of the cause that the damage of piles occurred in Chiba prefecture during the 2011 off the Pacific Coast of Tohoku Earthquake.
    Results similar to the real damage was obtained, using an analysis models considering the nonlinearity of piles, pile head connections and soil springs and assuming progress of graded destruction and distribution of axial loads.
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  • STRUCTURAL DESIGN AND CONSTRUCTION OF REINFORCED CONCRETE SHELL STRUCTURE WITH SHALLOW FREEFORM SURFACE
    –Structural planning and design policy (Part 1)–
    Hideaki HAMADA, Hirotoshi KOMATSU, Mutsuro SASAKI
    2017 Volume 23 Issue 54 Pages 453-458
    Published: 2017
    Released on J-STAGE: June 20, 2017
    DOIhttps://doi.org/10.3130/aijt.23.453
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    The roof of the Teshima Art Museum’s main building in Teshima, Kagawa Prefecture, is a reinforced concrete shell with a freeform curved surface in the shape of a water droplet, having a maximum span of 41.2m, a maximum rise 5.12m and thickness of 250mm. This paper discusses the structural planning, design and construction methods for implementing such shallow, thin RC shells with freeform curved surfaces. Especially, we described in detail about the building summary, the form-finding of shells by computational morphogenesis and the policy of structural design.
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  • DEVELOPMENT OF WOODEN SLIDING PANEL WALL AND ITS IN-PLANE SHEAR TESTS
    Sumio MARUYAMA, Yasutaka IRIE
    2017 Volume 23 Issue 54 Pages 459-463
    Published: 2017
    Released on J-STAGE: June 20, 2017
    DOIhttps://doi.org/10.3130/aijt.23.459
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    This paper describes a new developed wooden sliding panel wall inserted in wooden frame. In-plane shear tests for two types of these panel walls were carried out compared with the typical plywood sheathed wall. The main results are as follows. The rigidity and strength of the new developed walls are about 20% and 50% of those of contemporary bearing walls under the horizontal deformation of 0.05 rad. Although, beyond this deformation, the rigidity and strength of new developed walls gradually improve and withstand large load.
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  • INFLUENCE OF EDGE BONDING AND GAPS BETWEEN LAMINAE OF CLT ON PULL-OUT PROPERTIES OF LSB
    Parallel to the grain direction (Part 1)
    Makoto NAKATANI, Takuro MORI
    2017 Volume 23 Issue 54 Pages 465-468
    Published: 2017
    Released on J-STAGE: June 20, 2017
    DOIhttps://doi.org/10.3130/aijt.23.465
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    An influence of edge bonding between laminae, edge gaps between laminae without edge bonding, and edge distance from LSB to egde of a lamina, on pull-out properties of LSB joint embedded into CLT parallel to the grain direction was investigated and confirmed following characteristics.
    1. Edge bonding was no effect on pull-out properties.
    2. Pull-out properties of LSB embedded into a gap decreased with increasing width of the gap.
    3. The edge distance was no effect on pull-out properties, if it is more than 0.7 times of a top thread diameter of LSB or the gaps is below 0.5 mm.
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  • STUDY ON AN ULTRASONIC VELOCITY OF WOOD
    Norifumi HAYAMI, Sunao KOBAYASHI, Mina SUGINO, Yasuhiro HAYASHI
    2017 Volume 23 Issue 54 Pages 469-474
    Published: 2017
    Released on J-STAGE: June 20, 2017
    DOIhttps://doi.org/10.3130/aijt.23.469
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    To estimate the Young’s modulus or internal defects of wood with a non-destructive test using an ultrasonic velocity, the factors contributing the velocity need revealing. The detailed distributions of the ultrasonic velocity, measured with a measuring instrument and particular pointed sensors, show as follows: Of the three directions of wood grain, the ultrasonic velocities increase in the order tangential, radial, longitudinal directions. In the longitudinal direction, the velocity around the pith is slower remarkably. A slit between two sensors extends the transmission path, and thus slows the ultrasonic velocity.
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  • STRUCTURAL INVESTIGATION OF MACHIYA NAGAYA IN KYOTO POSSESSES VACANT HOUSES
    Masaru UCHIDA, Satomi TOKUOKA, Mina SUGINO, Aiko TAKATORI, Yasuhiro HA ...
    2017 Volume 23 Issue 54 Pages 475-480
    Published: 2017
    Released on J-STAGE: June 20, 2017
    DOIhttps://doi.org/10.3130/aijt.23.475
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    This paper describes the results of the structural survey on wooden traditional row houses in Kyoto including vacant houses. Through the investigation, the structural features including the seismic performance of the row houses were revealed. We analyzed the influence when only one house of the same row house was demolished or reinforced. Finally, we investigated the differences in transition of temperature and humidity between the occupied house and the vacant house of the same row house.
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  • EXPERIMENTAL STUDY OF FULL-SCALE STATIC LOADING TEST ON WOODEN KING-POST TRUSSES USING PRE-CUT SYSTEM FOR FRAMEWORK OF WOODEN HOUSE SPACE
    Hirohide TAO, Kenta SASAKI, Hiro KAWAHARA, Masahiro INAYAMA, Kazuhiko ...
    2017 Volume 23 Issue 54 Pages 481-486
    Published: 2017
    Released on J-STAGE: June 20, 2017
    DOIhttps://doi.org/10.3130/aijt.23.481
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    We studied and developed 9 meters to 12 meters span wooden king-post trusses and others using circulated timber and pre-cut system for framework of wooden house, which can be adapted in low rise buildings such as school buildings and so on. Upon developing, we had conducted full-scale static loading test and grasped the characteristics of those. In 2015, a revised edition of JIS A 3301-2015 (Design standards for wooden construction of school buildings), adopting these trusses, was released.
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  • DEVELOPMENT OF PARALLEL CHORD TRUSS USING PRE-CUT SYSTEM AND STANDARD SIZE TIMBER FOR RESIDENTIAL USE
    Kenta SASAKI, Hirohide TAO, Hiro KAWAHARA, Kenji AOKI, Masahiro INAYAM ...
    2017 Volume 23 Issue 54 Pages 487-492
    Published: 2017
    Released on J-STAGE: June 20, 2017
    DOIhttps://doi.org/10.3130/aijt.23.487
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    Wooden trusses are effective method for constructing long span beams using standard size timber for residential use which is under six meters long. In this research, in order to create the standard drawings, the full-size bending test of parallel chord truss which took up three tree wood and was consisted by typical metal fittings and joints that can be produced by pre-cut system was carried out. As the results, it indicated structural property of each wood species and calculation formula to estimate the yield strength and the rigidity was established.
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  • A STUDY ON THE ADHESION OF PLASTER IN LATH AND PLASTER CEILING
    Iuko TSUWA, Takuya IMAI, Takayuki FUJIMOTO, Masayuki IWATA, Mikio KOSH ...
    2017 Volume 23 Issue 54 Pages 493-496
    Published: 2017
    Released on J-STAGE: June 20, 2017
    DOIhttps://doi.org/10.3130/aijt.23.493
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    We conducted tension and shearing tests on lath and plaster ceiling in order to reveal the structural mechanism about the adhesion of plaster to wooden laths. In addition, we developed a mechanical model and a structural design formula for lath and plaster ceiling. Through the tests, it was found that whether plaster is pushed out to the rear of wooden laths or not, has the most important influence on the adhesion of plaster. We could develop the formula to accurately evaluate the strength of lath and plaster ceiling.
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  • QUICK POST-EARTHQUAKE DAMAGE EVALUATION FOR RC BUILDINGS BASED ON SUCCESSIVE MODIFICATION OF ANALYTICAL MODEL WITH FEEDBACK OF OBSERVED SEISMIC RESPONSE
    Yuya NASHIMOTO, Yusuke KIKUCHI, Yusuke SUZUKI, Masaki MAEDA
    2017 Volume 23 Issue 54 Pages 497-500
    Published: 2017
    Released on J-STAGE: June 20, 2017
    DOIhttps://doi.org/10.3130/aijt.23.497
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    In order to reduce the time and labor in damage investigation, post-earthquake damage evaluation method in real time for RC buildings using observed ground motion and building response is proposed. First, capacity spectrum of the building is adjusted according to observed acceleration response records since the capacity spectrum using only current analytical method is not always accurate. Adjusted capacity spectrum not only can estimate the building response at the time of earthquake, but also can estimate response for larger earthquake that the building has not experienced. Then based on the estimated response and adjusted analysis model, the damage level and residual seismic capacity are determined and post-earthquake damage is evaluated. The proposed evaluation could estimate accurately the damage level. However, the accuracy decreases at the point just between the borders of damage level.
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  • BOND SPLITTING STRENGTH OF LAP SPLICE OF CONCRETE BEAMS USING REINFORCING BAR AND METAL GRID
    Ryuji MATSUNAGA, Noritaka MOROHASHI
    2017 Volume 23 Issue 54 Pages 501-505
    Published: 2017
    Released on J-STAGE: June 20, 2017
    DOIhttps://doi.org/10.3130/aijt.23.501
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    This report verified the bond splitting strength of lap splice of concrete beams using reinforcing bar and metal grid. Cyclic loading test was carried out on 5 specimens in which all reinforcement were spliced at the same section. The variables of specimens of metal grid were four kinds of different types of thickness and shapes, such as expanded metal grid and square metal grid. Measurements were the maximum crack width and ultimate cracking pattern and failure mode of splices. From this investigation, it became clear that the bond splitting strength of concrete beams using metal grid fell compared using reinforcing bar.
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  • THE ANCHOR-LESS STRUCTURAL SYSTEM USING A BUCKLING-RESTRAINED BRACE AND STEEL-FRAME
    Takamasa KIKUCHI, Kazuhisa KOYANO, Hiroyasu SAKATA, Mamoru IWATA
    2017 Volume 23 Issue 54 Pages 507-511
    Published: 2017
    Released on J-STAGE: June 20, 2017
    DOIhttps://doi.org/10.3130/aijt.23.507
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    The buckling-restrained braces using the steel mortal planks (BRBSM) is applied to reinforced concrete structure (RC structure). In general, it is difficult to design and construction for buildings that integrated RC structure with the buckling-restrained braces. Therefore, in this paper, we report the anchor-less structural system using bedplates and wedges. Structural performance of this system is confirmed by the experiments using specimens of low strength type and high strength type. According to the tests, the effectiveness of this system is verified. However, the improvement of the steel frame is necessary to more follow for the deformation of the RC structure.
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  • STUDY ON NATURAL FREQUENCY OF LIGHT-GAUGE STEEL HOUSE DAMAGED BY EARTHQUAKE
    Sumito SAITO, Ken NISHIMURA, Tamaki MAEDA, Yasuhiro HAYASHI
    2017 Volume 23 Issue 54 Pages 513-516
    Published: 2017
    Released on J-STAGE: June 20, 2017
    DOIhttps://doi.org/10.3130/aijt.23.513
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    After 2016 Kumamoto Earthquake, we investigated 80 two-storied damaged houses of light-gauge steel structure by microtremor measurement and visual check. We analyzed the relationship of natural frequency of the houses by microtremor measurement and average displacement response spectrum (0.2 - 0.3 seconds) of construction area. As a result, natural frequency of the houses decrease as the displacement response spectrum increase.
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Environmental Engineering
Architectural Planning and Design
  • A STUDY OF THE COLLABORATIVE LIFE AND THE SPACE DEMAND FOR THE SILVER SHEARED LIVING
    The possibility from the ideal life by the workshops
    Tetsu TOKUONO, Shunsuke YOKOYAMA
    2017 Volume 23 Issue 54 Pages 613-618
    Published: 2017
    Released on J-STAGE: June 20, 2017
    DOIhttps://doi.org/10.3130/aijt.23.613
    JOURNAL FREE ACCESS
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    “Silver Sheared Living (SSL)” is one of the new choices of the dwellings at home for the independent old man who wants to continue living individually in his local community with his friends. SSL is located on the centre of private house and elderly apartment house. On this study, the ideal images, the problems for realization and the importance as a dwelling of SSL were defined through the workshops with the old men and women. For elderly people that want both to save their privacies and to hinder the isolations, SSL has the possibilities as the elderly houses after this.
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  • BEGINNINGS AND EXPANSIONS OF PRIVATE APARTMENT HOUSES SUPPLIES
    –Local development in Tokyo area through the newspaper advertisements and articles (1)–
    Tetsu TOKUONO, Shunsuke YOKOYAMA
    2017 Volume 23 Issue 54 Pages 619-624
    Published: 2017
    Released on J-STAGE: June 20, 2017
    DOIhttps://doi.org/10.3130/aijt.23.619
    JOURNAL FREE ACCESS
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    The purpose of this study is to grasp the local development of the nongovernment apartment houses supplies on the early stage in Tokyo area after the war. The sources of information for the analysis are advertisements of real estate on Asahi newspaper morning (Tokyo) (1952-1973). The analysis by locations and times proved that the local development was dynamic as follows. 1) The rental apartment houses supply went ahead earlier than the condominiums supply. 2) Later, the condominiums supply passed and spread throughout Tokyo area. 3) The high level technical and architectural attempts were proposed.
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