KUWATA Yasuko | |
Graduate School of Engineering / Department of Civil Engineering | |
Associate Professor | |
Civil Engineering / Architecutre and planning / Building Engineering |
Sep. 2008 日本自然災害学会, 平成20年度学術発表優秀賞, 汶川地震の地表断層変位と周辺建物被害
Feb. 2008 土木学会地震工学委員会, 平成19年度土木学会地震工学論文集論文奨励賞, 37歳以下の研究者
Dec. 2007 土木学会, 平成19年度土木学会全国大会第62回年次学術講演会優秀講演者賞, 40歳以下の研究者
Feb. 2006 日本地震工学会, 2006年日本地震工学会論文奨励賞, 2006年4月1日現在で35才未満の若手研究者
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Referring from the case where several pipes with large diameter had damaged with cracks by the earthquake in northern Osaka in 2018, it is considered that not only factors such as insufficient strength and deterioration but also that the pipes with larger diameters is more vulnerable than those with small diameters for the seismic resistance in the transverse direction, which is a so-called size effect. In this study, the more accurate calculation method using soil-and-pipe FEM model and giving inertial force without using soil spring. The influence of the diameter on the seismic response for water pipes with small to large diameters are made clarified. Furthermore, the seismic resistance was compared under various conditions with regard to the damage factor of the 900 mm diameter pipe during the last earthquake. As a result, it was found that the reduction in pipe thickness due to corrosion deterioration contributes more as a damage factor than the increase in hydraulic pressure during the earthquake.
Japan Society of Civil Engineers, 2021, Journal of Japan Society of Civil Engineers, Ser. A1 (Structural Engineering & Earthquake Engineering (SE/EE)), 77 (4), I_207 - I_214, JapaneseIn the guideline for seismic design of buried pipes, the characteristics of the ground spring in the pipe axial direction, which represents the dynamic interaction between the pipeline and ground, are important for evaluating the seismic resistance of the buried pipes under the seismic forces. The ground spring characteristic in the pipe axial direction is modeled as a bilinear type in which the slip occurs between the pipe and ground if the shear stress exceeds a certain limit. However, the buried pipe has joints, and the friction in the pipe axial direction includes the friction due to the joint's overhanging part, but their modeling has not been sufficiently studied. In this study, in order to understand the movement of soil particles around the joint when shear displacement is applied, an shear deformation experiment that the pipe and the soil particles are replaced by a two-dimensional cross section was carried out. The movement of soil particles was visualized and the friction mechanism was clarified microscopically.
Japan Society of Civil Engineers, 2021, Journal of Japan Society of Civil Engineers, Ser. A1 (Structural Engineering & Earthquake Engineering (SE/EE)), 77 (4), I_71 - I_78, JapaneseSeismic resistance of water supply facility and pipeline is promoted to reduce suspension of water supply by an earthquake. Lightweight welded steel pipes with seismic resistance have been widely used for pipeline attached on the bridge. However, there are problems on securing engineers for the field welding method and maintenance. A connection method with seismic resistance, no risk of water leak and easily connection is expected. This study aims to develop mechanical fittings of steel pipe confirmed with seismic resistance equal to or higher than that of welding joints. It can connect easily and reliably by non-specialist engineers. Design verification and verification test were carried out. The seismic resistance of mechanical fittings of steel pipe equal to or higher than that of welding joints was confirmed.
Japan Society of Civil Engineers, 2021, Journal of Japan Society of Civil Engineers, Ser. A1 (Structural Engineering & Earthquake Engineering (SE/EE)), 77 (4), I_79 - I_87, JapaneseAs a method for evaluating the seismic performance of buried pipelines for fluid transportation such as water supply, industrial water, and agricultural water, response displacement method is applied. In the case of seamless continuous pipelines (integral structure pipelines) such as steel pipes and polyethylene pipes, the ground strain acting in the axial direction of the pipe is compared with the allowable strain of the pipe. The critical performance of the polyethylene pipe was evaluated by cyclic tensile and compression load test. As a result, it was revealed that the vibration safety margin is about 25 to 50 times of the equivalent repetition frequency calculated from the earthquakes observed in the past. In addition, since the PE pipe has a small elastic modulus compared to steel pipe, it is feared that it will be damaged during construction or other works in service. The seismic performance in the case with scratches on pipe was also evaluated. It was also confirmed that the seismic performance did not deteriorate within the allowable range for scratches set based on the long terms water tightness.
Japan Society of Civil Engineers, 2021, Journal of Japan Society of Civil Engineers, Ser. A1 (Structural Engineering & Earthquake Engineering (SE/EE)), 77 (4), I_88 - I_95, Japanese[Refereed]
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熊本地震では,水道施設にも多数の被害が生じたが,河川に囲まれた軟弱な粘土層と飽和砂層で構成された低地にある水道用井戸の水源地周辺においては,想定していなかった顕著な地盤変状に伴う水道施設の被害や,新耐震基準以降に建設された水道施設の建築物に基礎被害が多数確認された.筆者らは,浄水場や下水処理場および上下水道管路網の地震被害軽減対策を研究しており,これらの水道施設の被害と液状化を含む地盤の地震時挙動との関連性や対策に関する知見を得るために各種調査や検証解析を実施した.本報告では,これらの調査結果を報告するとともに,熊本市の水道事業において特に重要な井戸水源地施設の基礎杭及び井戸ケーシングを対象として,地震被害のメカニズムや要因を分析し,今後の耐震設計における留意点などを考察した.
公益社団法人 土木学会, Nov. 2018, 土木学会論文集A1, 74 (4), I_986 - I_1001, Japanese[Refereed]
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Conventional damage prediction methods for lifeline structures are primarily based on peak ground motion measurements. However, line structures such as lifelines suffer damage that is mainly induced by the strain of the ground and therefore are likely to be vulnerable to sharp spatial changes in the ground motion. In this study, we propose a measure for evaluating the damage incurred by underground water supply pipelines based on the spatial gradient of the peak ground velocity (PGV), in an attempt to quantify the effects of the geospatial variabilities in the ground motion on pipeline damage. We investigated the spatial distribution of the damage caused to water pipelines during the Niigata-ken Chuetsu earthquake on October 10, 2004 (Japan Meteorological Agency magnitude (M-JMA) of 6.8) and the Kobe earthquake on January 17, 1995 (M(JMA)7.3) and compared the surveyed damage with the PGV distribution as well as with the gradients of the PGV calculated around the damage areas. For the Kobe earthquake, we used the PGV distribution obtained by the strong-motion simulation performed by Matsushima and Kawase . In case of the Chuetsu earthquake, we estimated the ground motion using a broadband-frequency-based strong-ground-motion simulation method based on a multiasperity source model. In both cases, we calculated the gradients of the PGV along the geographical coordinates, with the amplitude of the PGV gradient vector being employed as the damage estimator. Our results show that the distribution of damage to underground water supply pipelines exhibits a greater correlation with the gradients of the PGV than with the PGV itself. Thus, the gradient of the PGV is a useful index for preparing initial-screening hazard maps of underground facilities. Copyright (c) 2017 John Wiley & Sons, Ltd.
WILEY, Jul. 2017, EARTHQUAKE ENGINEERING & STRUCTURAL DYNAMICS, 46 (9), 1531 - 1548, English[Refereed]
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In the current seismic design of a buried pipe, the axial ground restraint force between a pipe and the ground is modeled as a bi-linear system with respect to the relative displacement. In other words, the soil friction determining the ground restraint force is assumed as constant regardless of the pipe velocity. However, it is thought that the soil friction depends on pipe velocity because of the relocation of the soil particles. This study attempted to examine the velocity dependency of the dynamic soil friction using a pipe-pulling test on a shaking table. The conclusions were as follows: (1) the maximum friction in the low velocity case was larger than that in the high velocity case, (2) the soil dilatancy affected the friction, and (3) the friction in the cases with a pipe fitting was 1.5 times larger than that without the fitting regardless of the pipe velocity.
American Society of Civil Engineers (ASCE), 2016, International Collaboration in Lifeline Earthquake Engineering 2016 - Proceedings of the 7th China-Japan-US Trilateral Symposium on Lifeline Earthquake Engineering, 309 - 315, English[Refereed]
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We have developed updated attenuation relations for peak ground acceleration (PGA), peak ground velocity (PGV), and acceleration response spectra with 5% damping on the basis of the data (78 earthquakes and 351 records) pertaining to strong ground motion in Iran. Moment magnitude, distance, fault mechanism, site class, and zone were the model parameters considered. A term for the saturation of the acceleration amplitude was also used in the model in order to improve the estimations in near-source regions. A nonlinear regression analysis was performed to obtain the coefficients. A comparison between the data set used in the current study for Iran and two next generation attenuation (NGA) models showed good correlation between our model and the Campbell-Bozorgnia NGA model. The model described is applicable for moment magnitudes from 5.0 to 7.3, distances from 15 to 135 km, and site classes with an average shear-wave velocity at a subsurface depth of 30 m (AVS30) of more than 175 m/s. [DOI:10.1193/1.3673622]
EARTHQUAKE ENGINEERING RESEARCH INST, Feb. 2012, EARTHQUAKE SPECTRA, 28 (1), 257 - 276, English[Refereed]
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The Indian Ocean earthquake and tsunami occurred in December 2004 caused destructive damage to Phang Nga Province, Thailand. We carried out two times of interview surveys about 1 and 3 years after the event to administrative bodies and lifeline companies for getting the information on lifeline damage, restoration and reconstruction situation, and summarized the basic concept of reconstruction plan of tsunami suffered towns considering lifeline restoration. On the other hand, as for the comparison of reconstruction problems, the lifelines recovery is reviewed at Aonae district in Okushiri Island after the 1993 Hokkaido-Nansei-oki earthquake. As the result, the difference of the process of reconstruction of town and lifelines has been revealed and the importance of preparing of the reconstruction plan before the event under the consideration of a long-term city planning is pointed out.
WORLD SCIENTIFIC PUBL CO PTE LTD, Jun. 2010, JOURNAL OF EARTHQUAKE AND TSUNAMI, 4 (2), 83 - 93, English[Refereed]
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This paper proposes a method to evaluate functionality of a business after a tsunami disaster. This method has several modules such as damage estimation of business base (building, equipments, and lifeline) caused by tsunami hazard, restoration ratio-to-time model for business base, and the functionality of the business introduced by facility restoration and its influence to the business. As a case study, the tsunami impact to industries and its subsequent restoration process were studied based on an interview survey in southern Sri Lanka after the 2004 Indian Ocean earthquake and tsunami, and the survey results were applied to the proposed model. Results of application showed that buildings and equipments were slowly restored when they were extensively damaged or flooded. Further, the business restoration depends more heavily on the business facilities restoration than the lifeline restoration, when the business facilities are flooded with tsunami inundation higher than 1m.
WORLD SCIENTIFIC PUBL CO PTE LTD, Jun. 2010, JOURNAL OF EARTHQUAKE AND TSUNAMI, 4 (2), 73 - 81, English[Refereed]
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Damage estimation relationships have been proposed based on seismic ground motions and pipeline damage records from past earthquakes as a technique for understanding damage in future seismic hazards. This kind of relationship is formulated by correcting the standard damage relationship shown by the amount of damage from seismic ground motion with coefficients such as pipe materials and ground conditions. However, the existing relationship is based on the actual earthquake data, and has not yet been verified by numerical analysis. In addition, there is little data on pipeline damage by high-level seismic ground motion from the 1995 Kobe earthquake, and we cannot compare those in the other earthquakes. Therefore, this study was conducted to analyse the damage tendency by using the seismic response analysis of a pipeline under high-level ground motion with the aid of the discrete element method (DEM), which can express slipping out and breaking of the pipeline joint. The damage tendency to the pipeline was evaluated relatively by giving the characteristic of the pipe material and joint. © IWA Publishing 2010.
2010, Journal of Water Supply: Research and Technology - AQUA, 59 (6-7), 400 - 407, English[Refereed]
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Damage estimation relationships have been proposed based on seismic ground motions and pipeline damage records from past earthquakes as a technique for understanding damage in future seismic hazards. This kind of relationship is formulated by correcting the standard damage relationship shown by the amount of damage from seismic ground motion with coefficients such as pipe materials and ground conditions. However, the existing relationship is based on the actual earthquake data, and has not yet been verified by numerical analysis. In addition, there is little data on pipeline damage by high-level seismic ground motion from the 1995 Kobe earthquake, and we cannot compare those in the other earthquakes. Therefore, this study was conducted to analyse the damage tendency by using the seismic response analysis of a pipeline under high-level ground motion with the aid of the discrete element method (DEM), which can express slipping out and breaking of the pipeline joint. The damage tendency to the pipeline was evaluated relatively by giving the characteristic of the pipe material and joint.
IWA PUBLISHING, 2010, JOURNAL OF WATER SUPPLY RESEARCH AND TECHNOLOGY-AQUA, 59 (6-7), 400 - 407, English[Refereed]
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Water supply is vital for our life especially after an earthquake. In the water supply departments in large cities in Japan, more than 1,000 employees commute for 1 hour on average using several means of transportation. If an earthquake or other event occurs in the middle of the night or early in the morning, staff mobilization would be delayed due to the malfunction of public transportation systems and staff personal issues. This study purposes a model to evaluate staff mobilization for water supply departments based on the results of the questionnaire survey in Osaka City during 1995 Kobe earthquake. It also discusses one phenomenon about inter- dependence of water supply and transportation systems. Simulation of staff mobilization can estimate staff availability for emergency waterworks in terms of number and response time. © 2009 ASCE.
2009, TCLEE 2009: Lifeline Earthquake Engineering in a Multihazard Environment, 357, 117, English[Refereed]
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This paper investigates the effects of the lifeline malfunction on the loss of human lives during the 1995 Kobe earthquakes. Firstly those effects were reviewed for firefighting and hospital waters relating to water supply lifelines. Those lives which might have been saved if the water lifelines had worked shortly after the earthquake are analyzed based on the records of firefighting operation and have been counted as approximately 32 to 45 people. Next, an exclusive water supply system for firefighting introduced into fire fragile areas after the earthquakes is designed giving basic procedures based on cost-effectiveness.
2007, WIT Transactions on the Built Environment, 93, 319 - 327, English[Refereed]
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This paper investigates the effects of the lifeline malfunction on the loss of human lives during the 1995 Kobe earthquakes. Firstly those effects were reviewed for firefighting and hospital waters relating to water supply lifelines. Those lives which might have been saved if the water lifelines had worked shortly after the earthquake are analyzed based on the records of firefighting operation and have been counted as approximately 32 to 45 people. Next, an exclusive water supply system for firefighting introduced into fire fragile areas after the earthquakes is designed giving basic procedures based on cost-effectiveness.
WIT PRESS/COMPUTATIONAL MECHANICS PUBLICATIONS, 2007, EARTHQUAKE RESISTANT ENGINEERING STRUCTURES VI, 93, 319 - +, English[Refereed]
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To save lives immediately after a catastrophic earthquake occurs, it is essential for an urban transportation system to retain its functional performance in order to carry injured people to hospitals. Recent seismic assessment studies have mostly been based on cost-benefit analyses, carried out in monetary terms that are reasonable for long-term considerations. However, many problems of seismic risk management still remain. For example, attributing a monetary value to a human life is considered impossible. Also, requirements for functioning of a transportation system are different in the period immediately after an earthquake. This paper concentrates on how to assess the importance of an urban transportation system as it relates to saving human life, and what system enhancements should be made to improve performance. This paper proposes a risk assessment method for the functional reliability of a transportation system immediately after an earthquake. In that period, system malfunction adversely affects the saving of lives as a result of time delays when moving injured people to medical facilities. A system dynamics simulation of transporting injured people is incorporated in the method, which uses two assessment approaches to evaluate the differences of cumulative injured people who receive medical care. In deciding on the destination of medical facility in the simulation, two ways of deciding are addressed; one uses information only on the road network, and the other uses information on both road network and hospital availability. Results of an application to an actual target area show the most vulnerable road links and differences of the two decision-making processes. A way to mitigate the loss due to damage to road links is examined. The paper also summarizes future developments in advanced information technology for emergency transportation systems.
KLUWER ACADEMIC PUBL, Sep. 2004, NATURAL HAZARDS, 33 (1), 23 - 46, English[Refereed]
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