Search Results 1-20 of 1121

  • FLUCTUATION FACTORS IN DYNAMIC CHARACTERISTICS OF A SIX-STORY WOODEN FRAMING BUILDING  [in Japanese]

    KASHIMA Toshihide , NAKAGAWA Hiroto

    … Event parameters and peak accelerations on the ground (GL), first floor (1F) and sixth floor (6F) of the major earthquakes are listed in Table 1.</p><p> From all strong motion data, the fundamental natural frequencies and damping ratios in two horizontal directions of the building were identified using a parameter optimization technique<sup>16)</sup>. …

    Journal of Structural and Construction Engineering (Transactions of AIJ) (763), 1199-1205, 2019-09

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  • STUDY ON SEISMIC RESPONSE OF LARGE-SPAN CANTILEVERED ROOFS CONSIDERING VIBRATION CHARACTERISTICS OF MAIN STRUCTURES  [in Japanese]

    ARAI Yudai , YAMASHITA Testuo

    … When these two modes resonate, vertical response acceleration of cantilevered roof might be very severe even if the building is subjected to only horizontal ground motion.</p><p> Secondly, seismic response of cantilevered roofs was evaluated using parametric analyses of simplified two-dimensional frame models. … It was found that the peak vertical response can be estimated as a function of the natural period ratio of the roof to that of the main structures, as found on shell-roofs on main structures. …

    Journal of Structural and Construction Engineering (Transactions of AIJ) (762), 1073-1080, 2019-08

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  • OVERTURNING RISK OF FURNITURE DUE TO THE LONG-PERIOD PULSE GROUND MOTION CONSIDERING KINETIC ENERGY  [in Japanese]

    HANATA Yuma , MURAO Osamu , MEGURO Kimiro

    … Long-period ground motion is ground movement during an earthquake with a period longer than 1 second and instantaneously generates large acceleration. … The peak of the total kinetic energy of furniture by the long-period pulse, namely the 2016 Kumamoto Earthquake, appears about 70 seconds earlier than the case of the 2011 earthquake.</p><p> 5. …

    Journal of Architecture and Planning (Transactions of AIJ) (761), 1645-1655, 2019-07

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  • Extreme Accelerations During Earthquakes Caused by Elastic Flapping Effect

    Goto Hiroyuki , Kaneko Yoshihiro , Young John , Avery Hamish , Damiano Len

    … Extremely large accelerations with the peak value of 3.2 times the gravity acceleration were recorded at seismic station WTMC located in northern South Island of New Zealand during the recent magnitude 7.8 Kaikoura earthquake. … Here we use numerical simulations to examine a range of physical models that can reproduce the observed characteristics of the acceleration record. …

    Scientific Reports (9), 2019-02-04

    IR 

  • INVESTIGATION ON THE APPLICABILITY OF THE EMPIRICAL PREDICTION METHOD TO CONSTRUCTION VIBRATIONS  [in Japanese]

    TSUNO Seiji , NOYORI Masanori , YOKOYAMA Hidefumi

    … Finally, we evaluated the peak ground acceleration (PGA) of construction vibrations again distances from construction sources, by the empirical prediction method based on the theory of wave propagation. …

    Journal of Environmental Engineering (Transactions of AIJ) (755), 21-28, 2019-01

    J-STAGE  AIJ 

  • AN APPROACH FOR MONITORING REAL TIME SEISMIC INTENSITY DISTRIBUTION USING SEISMIC INTENSITY NETWORK MAINTAINED BY LOCAL GOVERNMENT—CASE STUDY ON TOTTORI PREFECTURE—  [in Japanese]

    KAGAWA Takao

    <p> 緊急地震速報の高度化,高精度化には観測点密度を高くすることが解決方法のひとつとなる.その際,現状で最も高密度に配置されている自治体震度計の活用が候補となる.そこで,鳥取県震度観測ネットワークを対象に,1秒パケットで最大加速度および震度情報を配信できるようシステム更新をおこなった.その情報にPLUM法に準じた手法を適用し,準リアルタイムに県内震度分布の推移を表示するシステムを構築 …

    Journal of Japan Society of Civil Engineers, Ser. A1 (Structural Engineering & Earthquake Engineering (SE/EE)) 75(4), I_674-I_677, 2019

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  • PREVIOUS SEISMIC DAMAGE OF TELECOMMUNICATION PIPELINES IN BRIDGE SECTION  [in Japanese]

    TERASHIMA Mikihiro , SHOJI Gaku , OKUTSU Masaru , WAKATAKE Masato , SUETOMI Iwao , TSUKAMOTO Hiroyuki , SUZUKI Takanobu

    <p> 2004年新潟県中越地震,2007年新潟県中越沖地震,2011年東北地方太平洋沖地震及び2016年熊本地震では通信管路に甚大な被害が生じた.本論文では,これらの中で曝された橋梁区間における通信管路を対象とした上で,橋梁種別,建設年,橋長及び液状化の有無を考慮した微地形区分の観点からデータセットを構築し,属性に対するクロス集計を行い,被害率<i>R</i> …

    Journal of Japan Society of Civil Engineers, Ser. A1 (Structural Engineering & Earthquake Engineering (SE/EE)) 75(4), I_170-I_188, 2019

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  • DAMAGE ASSESSMENT OF SEWER BURIED PIPES SUBJECTED TO GROUND MOTIONS AND LIQUEFACTION IN PREVIOUS EARTHQUAKES  [in Japanese]

    HATAKEYAMA Daichi , SHOJI Gaku , NAGATA Shigeru

    <p> 2016年熊本地震をはじめ,強震動を起因とした下水道埋設管路の被害はいずれも甚大なものである.本研究では,熊本地震を含めた過去の地震において,地震動やそれに伴う液状化による下水道埋設管路の被害分析を被災エリアごとに行った.埋設管路の被害延長<i>L<sub>d</sub></i>を敷設延長<i>L</i>で …

    Journal of Japan Society of Civil Engineers, Ser. A1 (Structural Engineering & Earthquake Engineering (SE/EE)) 75(4), I_144-I_169, 2019

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  • Activity Profiles of International Goalball Players Using Wearable Devices

    IKEDA TAKASHI , IGUCHI YUKI , ISHIHARA YOSHIHIKO , SHIMASAKI YU , IKEDA HAYATO , YOSHIMURA MASAFUMI

    … </p><p><b><i>Methods: </i></b>Measured items were PlayerLoad<sup>TM</sup>, acceleration, deceleration, change of direction, and heart rate responses. … value in a 10-sequence interval was referred to as the "peak value", and the average 10-sequence interval value after the peak was expressed as "post value". … value was observed (from peak to post). …

    Juntendo Medical Journal 65(3), 279-285, 2019

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  • The relationship between trunk acceleration parameters and kinematic characteristics during walking in patients with stroke

    Yen Chu-Ling , Chang Ku-Chou , Wu Ching-Yi , Hsieh Yu-Wei

    … [Purpose] Limited literature has investigated the relationships between acceleration-based gait characteristics and kinematic information from motion analysis systems in gait analysis. … The purpose of this study is to determine whether acceleration-based gait characteristics were associated with gait characteristics by motion analysis systems in patients with stroke. … Trunk acceleration was measured with an accelerometer. …

    Journal of Physical Therapy Science 31(8), 638-644, 2019

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  • Investigation of effects on the contact condition and the collision behaviour of a wheelset with a flat set on a roller rig by the shape at the edge of the wheel flat  [in Japanese]

    MAKI Yasutaka , TERUMICHI Yoshiaki , YAMAMOTO Masataka , IKEUCHI Katsuyoshi

    … By making the radius of the front edge large, the maximum vertical acceleration of an axlebox decreased in the speed range less than 50 km/h compared with the one in case of the smaller front edge radius. … The speed corresponding to the peak value of the maximum vertical acceleration of the axlebox shifted from 30 km/h to 80 km/h. …

    Transactions of the JSME (in Japanese) 85(875), 19-00003-19-00003, 2019

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  • Factors affecting the 180-degree change-of-direction speed in youth male soccer players

    KEN-ICHI Kaneko , TOMOYA Hirano , MICHIO Yamagishi , YU Kashiwagi , NORIKO Hakamada , TAKAHITO Tago , KAZUO Funato

    … The section from the 4m point after the COD to the 0m point was defined as the accelerating section, and the time within the section was defined as the acceleration time (Tacc). … however, FG deceleration and acceleration were larger than those of SG (p < … Meanwhile, peak points of deceleration (Pdec) and acceleration (Pacc) for SG were closer to the cutting line than those for FG (p ≦ 0.001). …

    Human Performance Measurement 16(0), 1-10, 2019

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  • Ground Motions of the 2018 Northern Osaka Earthquake Based on Spectral Inversion and Ground Motion Prediction Equations  [in Japanese]

    SATOH Toshimi

    … The observed attenuation gradients for 5%-damped acceleration response spectra <i>S</i><sub>A</sub> … and peak ground velocity PGV are consistent to GMPEs for crustal earthquakes in western Japan. … The flat level of acceleration source spectra called as short-period spectral level <i>A </i>is estimated to 5.1−5.2×10<sup>18</sup> …

    Zisin (Journal of the Seismological Society of Japan. 2nd ser.) 71(0), 201-218, 2019

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  • Intra-rater reliability and criterion-related validity of using an accelerometer to measure the impact force and knee joint sway during single-leg drop landing

    Okamoto Shogo , Saito Ryuta , Sakamoto Masaaki

    Peak vertical acceleration, time between initial contact and peak vertical acceleration, and knee joint mediolateral sway were measured using the accelerometer during the landing motion. …

    Journal of Physical Therapy Science 31(4), 310-317, 2019

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  • Magnitude and frequency of head impact among university American football players

    Fukuda Takashi , Koike Sekiya , Miyakawa Shumpei , Fujiya Hiroto , Yamamoto Yuki

    … We used a Vector Mouthguard (i1 Biometrics Inc.) equipped with a 6DOF to measure the head LA (linear acceleration), AA (angular acceleration) and AV (angular velocity), as well as the number of head impacts during collisions, and evaluated 4 impact locations (front, side, back, and top) in detail. … Also, there were significant positive correlations between peak LA and peak AA at all head impact locations for games and practice sessions based on player position (p < …

    The Journal of Physical Fitness and Sports Medicine 8(1), 1-13, 2019

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  • Estimation of The Strong Motions at Mashiki Town, Kumamoto, During The 2016 Kumamoto Earthquake, Based on Microtremor Horizontal-to-Vertical Spectral Ratios

    SUN Jikai , KAWASE Hiroshi , NAGASHIMA Fumiaki

    … After deciding peak frequency on every MHVR curve, we made a fundamental peak frequency map of Mashiki Town. … We analyzed both linear and nonlinear cases for comparison and we estimated peak ground velocity (PGV) and peak ground acceleration (PGA) of all the sites. …

    京都大学防災研究所年報. B = Disaster Prevention Research Institute Annuals. B 61(B), 238-246, 2018-09

    IR 

  • Subsurface velocity structure and site amplification characteristics in Mashiki Town, Kumamoto Prefecture, Japan, inferred from microtremor and aftershock recordings of the 2016 Kumamoto earthquakes

    Hayashida Takumi , Yamada Masumi , Yamada Masayuki , Hada Koji , Mori Jim , Fujino Yoshinori , Sakaue Hiromu , Fukatsu Sosuke , Nishihara Eiko , Ouchi Toru , Fujii Akio

    … Our data also showed that the peak acceleration and velocity amplitudes, as well as seismic intensities for the small events in the less damaged zone, are clearly larger than those in the damaged zones, implying that the damage distribution is inconsistent with site response based on linear site amplifications. …

    Earth, Planets and Space (70), 2018-07-11

    IR 

  • EXPECTED VALUES OF DYNAMIC AMPLIFICATION RATIO OF NONSTRUCTURAL COMPONENTS IN RESONANCE CONSIDERING SIGNIFICANT DURATION OF STRONG GROUND MOTIONS  [in Japanese]

    KANEKO Kensaku

    … Its spectral peak, which occurs in resonance, is important in terms of deciding seismic design force of nonstructural components. … The peak acceleration normalized by floor acceleration, which is independent of seismic intensity is called dynamic amplification ratio (DAR). … The proposed variable give a degree of acceleration development associated with lapse of time. …

    Journal of Structural and Construction Engineering (Transactions of AIJ) (746), 555-563, 2018-04

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  • Reliability Analysis of River Bridge against Scours and Earthquakes

    Liao Kuo-Wei , Muto Yasunori , Gitomarsono Jessica

    … A series of nonlinear time-history analyses are performed to determine the structural performance under different peak-ground-acceleration values. …

    Journal of Performance of Constructed Facilities 32(3), 04018017, 2018-03-27

    IR 

  • Methodology of Salvaging Cultural Properties after Inland Earthquakes Based on the Result of Analyzing Activity Reports on the 2016Kumamoto Earthquake  [in Japanese]

    森井 順之 , 内藤 百合子 , 萬納 恵介 , 岡田 健

    … The Kumamoto Earthquake, which was a direct inland earthquake, has been known to have had a peak in the cycle of1to 2seconds from the acceleration response spectrum, and the results are confirmed such that most damage has been found in low-level wooden buildings. …

    保存科学 = Science for conservation (57), 181-188, 2018-03-23

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