Yusuke OnoTottori University | Toridai · Graduate School of Engineering
Yusuke Ono
Doctor of Engineering
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69
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Introduction
Skills and Expertise
Publications
Publications (69)
The seismic performance of underground linear structures is generally verified against member failure in the cross-sectional direction using two-dimensional seismic response analysis of soil-structure coupled systems. On the other hand, to verify the seismic performance of a single structure, a pushover analysis of the structure itself is sometimes...
This study aims to validate the seismic deformation analysis for masonry stone walls using the 3D discrete element method. First, two additional cases of inclination tests with small masonry brick stone walls were conducted as a continuation to a previous study. Numerical simulations with reexamined analytical parameters were performed to reproduce...
One of general method to simulate earthquake motion is to use envelope models. However, it restrict the phase characteristics of earthquake motion. Therefore, group delay time has been widely used in recent years as an objective and quantitative parameter to model the phase characteristics. The standard procedure calculates the phase in the frequen...
Landslides and slope failures are often caused by earthquakes. This study proposes a method to map earthquake-induced slope failure hazards that uses the analytic hierarchy process (AHP) and a geographic information system (GIS) for four districts where many slope failures were induced by earthquakes (the 2018 Hokkaido Eastern Iburi, 2016 Kumamoto,...
Masonry retaining walls are very fragile structures against earthquakes and a great number of damage cases have been reported. In order to mitigate such damage, it is necessary to understand the collapse mechanism of masonry walls during an earthquake and to evaluate stabilities and countermeasures. In recent years, several studies of the collapse...
Buried pipelines that intersect an active fault may be directly damaged by the movement of the fault. Since damage to buried pipes may have a significant impact on social activities, adequate countermeasures are desirable. This study conducted a distinct element method analysis to investigate the response of buried pipelines to lateral fault displa...
This study developed an original constant-head permeability apparatus for rocks. This apparatus can freely adjust the confining pressure and hydraulic pressure (hydraulic gradient), and can directly measure the runoff volume using an electronic balance. This apparatus can measure the hydraulic conductivity more accurately than the conventional cons...
The Mentawai Islands are located offshore of West Sumatra, Indonesia, and are likely to be hit by a large-scale tsunami in the future. In this study, maps showing tsunami evacuation times (ETs) along the road on the Mentawai Islands were developed to mitigate tsunami impact. We define the tsunami ET as the time required for an evacuee to move to a...
This study developed an original constant-head permeability apparatus for rocks. This apparatus can freely adjust the confining pressure and hydraulic pressure (hydraulic gradient), and can directly measure the runoff volume using an electronic balance. This apparatus can measure the hydraulic conductivity more accurately than the conventional cons...
Debris flows are among the fatal geological hazards in Malaysia, with 23 incidents recorded in the last two decades. To date, very few studies have been carried out to understand the debris flow processes, causes, and runouts nationwide. This study simulated the debris flow at the Mesilau watershed of Kundasang Sabah caused by the prolonged rainfal...
This research proposes a relationship between two methods such as a numerical approach by conducting a microtremor array observation and field survey by using the seismic cone penetration test unit (SCPTu). A database of shear-wave velocity (Vs) measurements was established using the microtremor array technique and seismic cone penetration test uni...
This research proposes a relationship between two methods
such as a numerical approach by conducting a microtremor
array observation and field survey by using the seismic cone
penetration test unit (SCPTu). A database of shear-wave
velocity (Vs) measurements was established using the
microtremor array technique and seismic cone penetration
test uni...
Padang is the capital of West Sumatra Province, close to three earthquake sources such as the Megathrust Zone, the Mentawai Fault, and the Great Sumatra Fault on the mainland. Due to the fact that the impact of the earthquake can create a tsunami event in the future, the government needs to prepare shelters for vertical evacuation. About 65 existin...
Since a masonry stone wall is vulnerable structure to strong earthquake motion, the masonry stone walls and the turrets of the Kumamoto castle have suffered severe damages during the 2016 Kumamoto earthquakes. Although Kumamoto city has been considering some seismic reinforcements for the damaged structures, they have not been able to confirm the e...
A M9 class earthquake followed by a massive tsunami is predicted to occur near the Mentawai Islands. Residents in the Mentawai Islands need to reach safety in a short time because the tsunami may reach the island within a few minutes after the earthquake. To reduce the time required for evacuation, motorcycles could be used. Motorcycles are the mai...
Multiple earthquakes have been felt in high-rise buildings in Bangkok despite the epicenters being far away. Seismic wave recordings in the Bangkok basin show a low-frequency peak. This study uses horizontal-to-vertical spectral ratio (HVSR) analysis and array analysis of ambient vibration data to find the predominant period of the ground and the s...
Isolation of small hamlets may occur in mountainous areas due to road blockage induced by slope failure during an earthquake. In this study, we developed a method to systematically extract the road sections that should be prioritized when taking measures to reduce the isolation risk of hamlets. The road network is modeled as a graph consists of nod...
The 2018 Sulawesi earthquake occurred on September 28th, at 18:02 local time (10:02 UTC) with moment magnitude Mw of 7.4, centered 26 km north of Donggala, Central Sulawesi in Indonesia. Field investigations were conducted to find a mechanism of liquefaction-induced large ground flow in some different sites, such as Balaroa and Petobo districts in...
The authors conducted a field survey in the affected area of the 2018 Sulawesi Earthquake, mainly focusing on the damage occurred to the Teluk Palu Bridge in Palu City. It was found that the area around the bridge received approximately 200 gal acceleration and 3 to 6 m tsunami height. From the traces of the tsunami, we estimated that the tsunami r...
On September 28th, 2018, at 18:02 local time (10:02 UTC), a strong earthquake of magnitude Mw = 7.5 struck Central Sulawesi Province, Indonesia. The epicenter was located at 0.256o south latitude and 119.846o east longitude, around 77 km from Palu city, and 20 km below the ground surface. To understand the damage caused by the earthquake, and find...
In this study, we investigated the applicability of earthquake response analysis using Smoothed Particle Hydrodynamics (SPH) method for simulating progressive slope failures induced by earthquakes. The SPH method is a large deformation analysis method of a continuous body that utilizes the elasto-plastic constitutive model and is possible to analyz...
In this paper, we analyzed the effect of artificial viscosity on the landslide flow distance in the Smoothed Particle Hydrodynamics (SPH) method. Moreover, to show the applicability to an estimation of flow distance, we conducted a two-dimensional simulation of the Aratozawa landslide. As a result, we obtained good agreement with actual damage of f...
Since a masonry stone wall is vulnerable structure to strong earthquake motion, the masonry stone walls and the turrets of the Kumamoto castle have suffered severe damages during the 2016 Kumamoto earthquakes. Although Kumamoto city has been considering some seismic reinforcements for the structures, they have not been able to confirm the effects o...
In this paper, the isolation probabilities of hamlets in Yamakoshi village during 2004 Niigata-ken Chuetsu earthquake and in Minami Aso village during 2016 Kumamoto earthquake were calculated and compared with actual isolation damage. Datasets of slope angles, PGAs of earthquake ground motion, and graphs of road networks are necessary for the calcu...
Taniguchi, et al. [1] developed an analytical method for evaluating the absolute maximum elasto-plastic displacements of multi-degree-of-freedom (MDOF) oscillators under the action of base excitation based on a modal combination. Its essence is that 1) modal frequencies, shapes and damping during yielding of any member of the MDOF oscillators are r...
Once a large deformation appears on the ground surface due to faulting during an earthquake, it may cause severe damage to infrastructure systems. A numerical simulation method that provides accurate prediction on the deformation of the ground surface is very useful for examining the performance of infrastructure systems subjected to a deformation...
Masonry retaining walls are very fragile structures against earthquakes and a great number of damages have been reported. We should elucidate a failure mechanism and make appropriate safety assessments and countermeasures.
The objective of this study is to establish the analytical methodology for the seismic evaluation of the masonry retaining wall...
In this study, geographical data on the road network downloaded from OpenStreetMap and altitude data from the Geographical Survey Foundation Map were used to quantify the possibility of isolation of a village during earthquake in a mountainous area. The possibility of isolation was defined by the probability of disconnection of the road network bet...
In the present study, a numerical method for analyzing the performance of an earthquake-resistant stone masonry retaining wall is developed. The Smoothed Particle Hydrodynamics (SPH) method and the Distinct Element Method (DEM) are combined in the developed method. In order to verify the developed method, a series of laboratory tests of earthquake-...
In this study, a three-dimensional simulation of the Aratozawa landslide due to the 2008 Iwate-Miyagi Inland earthquake based on the Smoothed Particle Hydrodynamics (SPH) method were conducted. The numerical results were compared with the observed damages especially with respect to the flow distance of the landslide. In order to obtain the material...
This study develops a new analytical method for evaluating maximum elasto-plastic displacement of multi-degree-of-freedom (MDOF) oscillators under the action of base excitation based on a modal combination. The essence is that modal frequencies, shapes and damping during yielding of any member of the MDOF oscillators are readily specified by the mo...
The discrete element method (DEM), the finite element method (FEM) and the discontinuous deformation analysis (DDA) have been applied to earthquake response analysis of masonry retaining walls. However, some difficulties still remains for these methods and an alternative numerical method is required. In this study we applied the Smoothed Particle H...
The Palu city, which is located in the active seismic zone of the Palu-Koro fault. Several powerful earthquakes have struck Palu city at previous years. One of the greatest earthquake event occurred in year 2006 which 6.2 Mw, about more a hundred buildings and houses were collapsed due to this earthquake. Palu-Koro fault also produced several tsuna...
The inversion analysis of the dispersion curve of Rayleigh wave extracted from the observed microtremor is often used to determine the shear wave profile of the subsurface layer. So far evolutionary optimization techniques such as the Genetic Algorithm have been applied to the inversion analysis. In this paper, application of the Particle Swarm Opt...
In recent years, earthquake-induced slope failures often occurred in our country. In order to examine the isolations of settlements in mountainous areas, it is necessary to predict damage states of slopes as well as seismic stability assessment of them. A numerical simulation of the 2008 Aratozawa landslide by the Smoothed Particle Hydrodynamics (S...
Very heavy rain on July 28th in 2013 in Yamaguchi and Shimane prefectures resulted in severe damages of railway bridges in the Abu river. To evaluate the water preressure induced in the bridges, we conducted numerical analysis using the Smoothed Paricle Hydradynamic Method. The numerical result shows that the heading up of the water flow induces th...
A heuristic minimal path sets method for analyzing seismic reliability of lifeline networks is proposed. For large-scale lifeline networks reliability computation can become prohibitive or inaccurate using the current enumeration methods. Although a few studies have considered both node and link failures, none of these methods has utilized the mini...
Multi-hazard risk assessment of lifeline systems is becoming more popular as utilities try to balance the risk across multiple hazards. In past decades, tremendous research efforts have been expended in assessing reliability and performance of lifeline networks under single catastrophic event, but there are minor researches presenting a multi-hazar...
Multi-hazard risk assessment of lifeline systems is becoming more popular as utilities try to balance the risk across multiple hazards. In past decades, tremendous research efforts have been expended in assessing reliability and performance of lifeline networks under single catastrophic event, but there are minor researches presenting a multi-hazar...
Recently, civil infrastructure and lifeline networks have been stressed by significant natural hazards and human errors leading to malfunction. Earthquakes and tsunamis, hurricanes and floods, blackouts and satellite failures have evidenced the vulnerability of these growing networks threatening the business con-tinuity and economy of several commu...
A shear wave velocity structure model of Padang, Indonesia was
developed and the site amplification characteristics of earthquake
ground motion were examined. The presented shear wave velocity structure
model was obtained based on the microtremor survey. The inversion
analysis of the dispersion curves of Rayleigh wave were performed for 11
sites wh...
This study aimed to clarify the influence of sloping wall to sloshing in a reservoir by numerical analysis called the SPH method. We compared SPH simulations with some theoretical equations and with some experiments. Finally, we proposed the equation which gave the natural circular frequency as the function of slope angle. The equation means that t...
A method to evaluate the network redundancy based on a recursive decomposition algorithm (RDA) introduced by Li and He in 2002 was employed to calculate the reliability of lifeline networks. A redundancy index proposed by Hoshiya and Yamamoto in 2002 was used to represent the redundancy of networks. RDA is shown to be much more effective, as compar...
The SPH (Smoothed Particle Hydrodynamics) method developed by Lucy (1997) amd Gingold and Monagan (1977) were employed to analyze elasto-plastic behavior of earth structures. The SPH method has been widely used in the fluid dynamics or astronomical physics. In this paper, the plastic potential theory was newly introduced to the SPH method and its c...
It is difficult to evaluate the sloshing load acting on a fixed roof of tank because it depends on the collision of the liquid to the roof. In this paper, the SPH simulation was introduced to evaluate the load acting on a fixed roof. The results obtained by the simulation showed good agreement with those obtained from other method. In addition, the...
Microtremor observations were carried out to determine the subsurface structures of the Padang City, Indonesia. Serious damages occurred by the strong ground motions during the 2009 Southern Sumatra earthquake in the area. The S-wave velocity structure models at the 12 sites were determined from array observation records. The predominant period at...
Probabilistic seismic hazard analysis integrates the contributions of all the possible events; thus, the concept of design earthquakes is lost. A significant earthquake can be defined as an earthquake having magnitude and distance which has the highest contribution in deaggregated hazard for the corresponding response parameter such as acceleration...
Multi-hazard risk assessment of lifeline systems is becoming more popular as utilities try to balance the risk across multiple hazards. In past decades, tremendous research efforts have been expended in assessing reliability and performance of lifeline networks under single catastrophic event, but there are minor researches presenting a multi-hazar...
This paper has examines the dynamic interaction between close-spaced shield tunnels during ground motion produced by a Level 2 Japanese Earthquake. Analysis is mainly focused in the evaluation of the vicinity effects between existing and new tunnels closely-spaced. This evaluation is based on analytical results from dynamic soil-structure interacti...
Probabilistic hazard estimate through out Nepal considering historical earthquakes, intra plate slip and faults are done. As a typical case probabilistic spectra are plotted for Pokhara city. For the city, design earthquakes for three probabilities of exceedences are simulated which can be useful to design new structures and retrofit of existing st...
Stone masonry houses are the most common type of construction in the Alpine Himalayan Belt across Pakistan, India and Nepal. However, the seismic resistance of these houses is highly questionable if constructed without any form of lateral support In this paper, the effectiveness of wooden bond beams as a retrofit solution has been examined. Dry sto...
The 26 December 2004 earthquake and tsunami significantly affected lifelines in Banda Aceh: (a) the water system sustained almost no damage due to shaking, but it had breaks at almost all aboveground stream crossings affected by the tsunami; (b) a waste disposal plant 1 km inland was estroyed by the tsunami; (c) electric utilities were not affected...
After landslides, damage to lifelines was the next most notable feature of the 23 October 2004 Niigata Ken Chuetsu, Japan, earthquake (M-w=6.6). Roads and highways sustained damage at over 6,000 locations; rail lines, water systems, and wastewater systems sustained major damage; and over 300,000 customers lost electric power. Nagaoka's water supply...
Redundancy is a classic technique for enhancing reliability, and is often cited as a virtue for seismic design. However, whether redundancy is actually achieved or not is very open to question. A structure may have many degrees of redundancy, yet low or nonexistent reliability (Hoshiya, 1971). In fact, for such a widely used term, it is surprising...
We represent analytically the properties for the Fourier spectrum of the earthquake source characteristics from the probabilistic point of view, and discuss the applicability of this analysis to the estimation of earthquake source characteristics. For this purpose, we deal with an impulse train model as a source time function which has been introdu...
On May 21, 2003 at 19:44:19 local time the Boumerdes earthquake struck the Zemmouri region in northern Algeria. Zemmouri is approximately 70 km east of the capital, Algiers. The moment magnitude of this event is 6.8. The location of epicenter is 36.90N 3.71E determined by U.S.G.S. The focal depth of the earthquake was about 10 km. This earthquake,...
地盤-構造物系における動的相互作用の影響の大きさは数多くの研究者によって指摘されており, 相互作用を適切に考慮した耐震設計に対する関心は極めて高い. この動的相互作用は, 水平ばねと回転ばねからなるスウェイ-ロッキングモデルを用いることで, 耐震設計に容易に取り込むことができる. しかしながら, これらの相互作用ばねを簡易にかつ適切に評価する手法は未だ確立されていない. そこで本研究では, 通常は設計時において有限要素法等による詳細な動的解析が行われない比較的小規模な杭基礎構造物を対象とし, 2次元梁要素と地盤ばねによりモデル化した杭基礎-地盤系に対して Pushover 解析を行い, 設計の実務レベルにおいて容易に相互作用ばねを評価する手法について検討した.
A heuristic minimal path sets method for analyzing seismic reliability of lifeline networks is proposed. For large-scale lifeline networks reliability computation can become prohibitive or inaccurate using the current enumeration methods. Although a few studies have considered both node and link failures, none of these methods has utilized the mini...
In this study, effects of dynamic interactions between pile-foundations and soils on strength demand spectra of highway bridge piers were investigated. Demanded strengths determined by the strength demand spectra control the ductility of structures. The strength demand spectra, therefore, becomes a useful tool for aseismic design taking into accoun...