Taiki Saito's research while affiliated with Toyohashi University of Technology and other places

Publications (55)

Article
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This paper assesses the factors those influence the in-plane structural behavior of masonry infill frames when exposed to seismic loading. The assessment is carried out using an infill frame with macro-element masonry (IFM2) model developed using an open-source computer program, STERA 3D. The frame and the masonry infill of the IFM2 model are simul...
Article
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The shear walls are essential seismic elements to increase buildings bearing capacity against earthquakes. In mid- and high-rise buildings, shear walls are subjected to predominant bending deformation under earthquakes, and the responses in upper floors increase. In order to utilize the shear walls appropriately, previous studies proposed to instal...
Article
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This study investigates the cumulative damage of a 20-story high-rise steel building equipped with buckling-restrained braces (BRB) under the likely occurrence of earthquake and wind events in the design life of the building. The objective of this research is to introduce a method for evaluating the cumulative damage of BRBs under multi-hazard even...
Article
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A vertical irregularity setback in reinforced concrete (RC) building affects its performance and response especially subjected to earthquake ground motions. It is necessary to understand how the seismic damage is established due to setbacks and avoid damage concentration on the irregularity section. The objective of this study is to propose a formu...
Article
This study conducted a shaking table test using a centrifuge model to clarify the dynamic response of the saturated soil–reinforced concrete pile–superstructure interaction under conditions of multiple earthquakes. The shaking table test was conducted under a 50-G field with multiple shaking inputs reproducing the mainshock and aftershocks to explo...
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This study proposes a capacity spectrum Method (CSM)-based procedure to estimate the maximum seismic performance of steel buildings passively controlled with bilinear oil dampers. In the proposed CSM, the maximum seismic response of a building was estimated, in the acceleration-displacement response spectrum, as the intersection between the capacit...
Article
Japan experiences a considerable number of low to medium earthquake shocks and long-duration winds throughout the year, which is relatively more as compared to other different regions of the world. Considering this multi-hazard scenario , structures designed using the existing guidelines may have significant chances to underestimate the induced dis...
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Aging building structure has become a world problem. This problem is particularly serious in developing and underdeveloped countries. The multihazard resilience and sustainability (e.g., seismic performance) decrease at the aging building. A construction method for strengthening aging-reinforced concrete buildings by wrapping structural members wit...
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In the current Japanese design code of pile foundations, the buckling behavior of pile member is not taken into account. This is because the surrounding ground restrains buckling of the pile member. However, when the ground liquefies, the stiffening force for horizontal deformation of the pile weakens. Therefore, when slender pile is subjected to h...
Article
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The JSSI published a manual for design, fabrication, testing, quality control, and analytical modeling of various types of passive control dampers1. The manual describes the important issues to be examined during the all stages of design, manufacture and construction of passive control devices. Recently, some manufacturer falsified the device param...
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In preparation for a major earthquake in the Nankai Trough, the authors plan to introduce a real-time seismic diagnostic system for emergency management center building clusters in the Aichi prefecture eastern region in Japan. The system involves installing seismometers (three-axis accelerometers) in the buildings and storing observation records in...
Article
The author proposed a new seismic response control system using a block and tackle (hereinafter, referred to as a dynamic pulley damper system) developed especially for the high-rise buildings. The proposed system has a configuration where a damper is installed on the track of the cable-stayed wire, amplifying the amount of movement of the wire by...
Article
Authors plan to introduce a real time seismic diagnostic system to the disaster prevention centers. This system consists of the seismometers installed in the building and observation data are saved in Internet clouds. Immediately after the earthquake, the system performs a simple diagnosis on the residual seismic performance of the building and not...
Conference Paper
On June 5th, 2015 a severe earthquake with a moment Magnitude of 6.0 occurred in Ranau, Malaysia. Depth of the epicenter is 10 km. Due to the earthquake, many facilities were damaged and 18 people were killed due to rockfalls [1]. Because the British Standard (BS) is adopted as a regulation for built buildings in Malaysia, the seismic force is not...
Conference Paper
In past earthquake disasters, numerous building structure piles were damaged by soil liquefaction occurring during the earthquake. Damage to these piles, because they are underground, is difficult to find. The authors aim to develop a monitoring method of pile damage based on superstructure dynamic response. This paper investigated the relationship...
Conference Paper
Mid-rise RC buildings gradually rise in Kabul and entire Afghanistan since 2001 due to rapid increase of population. To protect the safety of resident, Afghan Structure Code was issued in 2012. But the building constructed before 2012 failed to conform the code requirements. In Japan, new sets of rules and law for seismic design of buildings had be...
Conference Paper
The earthquakes that hit Kumamoto Prefecture in Japan on April 14 and 16, 2016 severely damaged over 180,000 houses, including over 8,000 that were completely destroyed and others that were partially damaged according to the Cabinet Office’s report as of November 14, 2016 [1]. Following these earthquakes, other parts of the world have been struck b...
Conference Paper
Full-text available
Mid-rise RC buildings gradually rise in Kabul and entire Afghanistan since 2001 due to rapid increase of population. To protect the safety of resident, Afghan Structure Code was issued in 2012. But the building constructed before 2012 failed to conform the code requirements. In Japan, new sets of rules and law for seismic design of buildings had be...
Conference Paper
In case of earthquake damage to buildings, the damage to a superstructure is visible, but the damage to a foundation structure, e.g. the underground pile, is difficult to detect. In this study, the authors aim to develop a monitoring technique for pile damage due to earthquakes. The world’s biggest shaking table, E-Defense, was used to reproduce da...
Conference Paper
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An innovative and economic seismic response control system using block and tackle system (hereinafter referred as movable pulley damper system) is under development. In order to clarify the influence of friction between the p ulley and the wire, a wire was applied to multiple pulleys and a static force test in which a weight was hung on one side wa...
Conference Paper
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Many medium-rise and high-rise reinforced concrete buildings were damaged during the 2010 Maule Chile earthquake. For rectangular reinforced concrete walls that are without boundary column in some buildings, flexural compression failures of multistory shear walls drew a lot of attention. It was found that design of boundary end of structural walls...
Conference Paper
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Earthquakes are caused by a sudden release of energy from the movement between tectonic plates; besides geological faults and volcanism. As Peru is located in a high seismic hazard zone, it is necessary to improve the seismic response of buildings against earthquakes. In addition, in recent years, large scale construction of medium-rise building th...
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Over the past 15 years, large scale construction of medium-rise buildings, built using Low Ductility Reinforced Concrete (LDRC) wall, have been commonplace in Peru. These walls do not have boundary columns and have a small quantity of reinforcing bars at each end, therefore is expected to fail in flexural mode. From past studies, where a retrofitti...
Conference Paper
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Carbon fiber sheet is used as retrofitting method to confine the concrete, from past studies it is known that carbon fiber sheet confinement improves the deformation capacity of concrete and delays the concrete crushing. A stress-strain relationship to model the confinement effect of carbon fiber sheet used to retrofit the concrete is proposed in t...
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Reinforced concrete (RC) buildings in Peru use low ductility walls, with rectangular cross-sections and reinforced with wire mesh and vertical reinforcement bars at boundary ends, as structural elements. These structural elements have no columns, have small amounts of reinforcing bars and are expected to fail in a brittle manner. In this study, a p...
Conference Paper
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El objetivo principal de este estudio es evaluar el riesgo sísmico de un edificio aislado durante su tiempo de vida útil. Para esto se propone una metodología de evaluación cuantitativa del riesgo sísmico de edificios aislados. Este procedimiento comienza con el análisis del peligro sísmico y el modelamiento de sismos para el área estudiada. Usando...
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In recent earthquake, most of new buildings doesn’t collapse but can’t guarantee a continued functionality after earthquake. This paper presents the case studies using 3 databases developed, which are damage evaluation, reparability evaluation and functionality evaluation, for post-earthquake resilient evaluation system. Regarding the result of rep...
Conference Paper
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A numerical simulation to evaluate responses of seismically isolated buildings during the Great East Japan Earthquake in 2011 is carried out in this study. The numerical simulation includes non-linear analyses of the base isolation system based on a simple bi-linear model and modified bi-linear model, which take into consideration the degradation o...
Article
抄録 Many seismic records were obtained during the 2011 off the Pacific coast of Tohoku Earthquake. It is very important to use them efficiently for the improvement of the buildings seismic design and the disaster prevention. In this paper, seismic simulation analyses of a SRC high-rise building located at Tokyo bay area were conducted based on the o...
Article
This paper aims to facilitate residents' autonomous refuge life in high-rise condominiums after earthquakes, which will occur more frequently in Tokyo in the near future. To understand attitudes about self-help and evacuation after earthquakes, this paper describes residents' attitudes obtained from a questionnaire that points out the inadequacy of...
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The dynamic behavior of an unreinforced masonry wall is investigated through a shaking table test of two specimens. In order to represent a non-engineering one-story house, the first specimen consists of a C-shaped structure with masonry walls connected only at their ends. The second specimen is built to represent an upper story, so the C wall is c...
Article
In order to study the hysteretic behavior of the Lead-plug Base Isolator, a modified Bi-Linear Model that takes into consideration the secondary stiffness degradation due to the strain level of the rubber was proposed. The developed model was used to conduct the numerical simulation of two base isolated buildings during the Great East Japan Earthqu...
Conference Paper
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Dynamic behavior of unreinforced masonry wall was investigated through a shaking table test in which two specimens were prepared. In order to simulate non-engineering houses of one story, the first specimen consists of a C shaped structure, whose masonry walls are connected only by their ends. The second specimen was built to idealize an upper stor...
Conference Paper
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The principal objective of this study is to evaluate the cost-effectiveness as well as the seismic safety of a base isolated building located in Peru. A methodology to evaluate quantitatively the seismic risk and the cost-effectiveness of a base isolated building during its lifetime is presented. The process starts with the hazard analysis and the...
Article
Structural vibration control is categorized into passive control, active control and semi-active control. Semi-active control using a variable damper stabilizes building responses in an earthquake better than the conventional passive control and active control.This paper used variable hydraulic damper and MR damper. The servo valve of variable hydr...
Article
Magnetorheological fluid damper (MR damper) has been expected to control the response of civil and building structures in recent years, because of its large force capacity and variable force characteristics. At first, a series of real-time hybrid tests was conducted. The important objective of this paper is to verify the validity of real-time hybri...
Article
This article proposes a new framework for performance-based design (PBD) of building structures. This framework was proposed under the 3-year Japanese Government Comprehensive Research and Development Project on “Development of a New Engineering Framework for Building Structures” launched in the fiscal year of 1995. The primary objective of the pro...
Conference Paper
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A modified version of the BRANZ procedure for lateral capacity rating of bracing walls is used to determine the sustainable lateral mass of a 910-mm wide '2x4' wood shear wall. The key modifications involve: (1) the use of a multi-criteria system identification method to determine a structural model that simultaneously fits test data from both cycl...
Conference Paper
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A modified version of the BRANZ procedure for lateral capacity rating of bracing walls was used to determine the sustainable lateral mass of a 910-mm wide '2x4' timber shear wall. The key modifications involve: (1) the use of a multi-criteria system identification method to determine a structural model that fits test data from both cyclic testing a...
Conference Paper
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A procedure for reliability assessment of timber buildings under earthquake loads is presented. Such a method can be used for: (a) estimating the reliability of existing buildings and to-be-built code-designed buildings against future earthquakes; and (b) code calibration to a target safety level. To illustrate the method, the hysteresis model para...
Article
This paper presents the procedure for seismic performance estimation of asymmetric buildings based on a concept of the capacity spectrum method. In order to evaluate the torsional effect due to plan asymmetry to inelastic seismic responses of asymmetric buildings, the strength modification factor and the deformation amplification factor are introdu...
Article
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This project aims to conduct a comprehensive research towards earthquake and tsunami disaster mitigation in Peru considering regional characteristics, under strong collaboration among researchers of Peru and Japan. Five main research activities are the followings: 1) Strong motion prediction and development of seismic microzonation; 2) Development...
Article
SYMMARY After the fire of oil storage tanks in 2003 Tokachi-oki Earthquake, the problem of long period earthquake ground motions has been the subject of public attention in Japan. Many seismologists have conducted simulation of long period earthquake ground motions at Tokyo, Osaka and Nagoya cities in the event of Tokai, Tonankai and Nankai Earthqu...
Article
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The reinforced concrete wall-frame structure is widely used for buildings in Japan because of its high lateral resistance against earthquakes. However, uncertainty exists concerning the evaluation of shear force carried by the wall and column elements. The structural test and the analytical study of a 6-story wall-frame specimen reveal that the roc...

Citations

... Islam [29] used an open source computer program, STERA 3D to model infill frame with macro-element masonry (IFM2). They also discretized using a combination of nonlinear bending and shear springs together with axial and shear spring for frames and infills, respectively. ...
... One study [2] intended to propose a structural solution for buildings with curtailed shear walls. To reduce the drifts of the upper part of the frame under earthquakes, bucklingrestrained braces (BRBs) are added. ...
... Therefore, damage quantification is a central subject in current structural design. In recent papers, ref. [20] investigated the cumulative damage of a 20-story highrise steel building equipped with buckling-restrained braces subjected to earthquake and wind events using Miner's damage rule, ref. [21] introduced a multiple-input convolutions neural network model in order to estimate the seismic damage buildings. Furthermore, ref. [22] studied the post seismic behavior of a reinforced concrete building which presented structural damage due to flexural and axial actions in one of its walls on the first floor. ...
... In this study, nonlinear structural seismic response analyses are employed using STERA_3D, a software developed by the co-author [26]. In the previous study by Maulana et al. [27], STERA_3D was used to conduct seismic response analyses for RC setback buildings, and the results were considerably matched with experimental shaking table tests. ...
... The BRB applied for the RC frame structure with the curtailed wall is chosen based on the study performed by Naqi and Saito [32]. This adoption consideration is taken on account of the similarity in the building's type, height, and dimensions. ...
... As stated in the World Heritage Convention (Unesco 1972), the degradation or destruction of any element of the cultural or natural heritage damages and impoverishes the heritage of all nations of the world. There are various methods such as sand compaction piles (Okamura et al. 2006), recycled materials (Otsubo et al. 2016), deep mixing (Bahmanpour et al. 2019), reinforced concrete piles (Hayashi et al. 2021), within the scope of improve the resistance against liquefaction. However, these traditional techniques can be applied before the construction. ...
... The force-velocity relationship of the oil damper normally appears as an ellipse hysteresis shape [24]. The bi-linear oil damper is modeled as a shear spring, including the Maxwell model with an elastic spring with stiffness, K D , and a dashpot with bilinear type damping coefficient, C, connected in series [25]. The element model of the bi-linear oil damper is shown in Figure 3a. ...
... Similarly, for the seismic loads too, the isolated structure needs to be checked for the accumulated damage over the design life apart from designing for the maximum considered seismic events. Recently, the focus on the multi-hazard response of the structures during their design life is gaining importance (Roy and Matsagar, 2019;Roy, Saito and Matsagar, 2021) thus, an investigation of the UFREI isolation system and the corresponding isolated structure under probable multi-hazard scenarios during its design life is still due. This study investigates the behavior of the UFREIs under prolonged multi-hazard scenarios comprising seismic and wind events and discusses its failure mechanisms to predict the probable life of the isolators. ...
... In Indonesia, to evaluate seismic performance of a reinforced concrete building, it is popular to use pushover analysis and time history analysis to check building responses and there are several examples of these analysis [11,12]. However, the usage of progressive collapse analysis in building for earthquake response is still rarely found in Indonesia, so far there was one but only used linear approach by comparing structural elements' demand-capacity ratios [13]. ...
... Seismic strengthening of RC walls with carbon fiber-reinforced polymer (FRP) has been extensively investigated to solve various problems, such as poor flexural ductility (Dan 2012;El-Sokkary et al. 2013;Khalil and Ghobarah 2005;Matsui et al. 2014Matsui et al. , 2017 and potential shear failures (Altin et al. 2013;El-Sokkary et al. 2013;Kobayashi 2005;Qazi et al. 2015). The FRP strengthening method studied by Matsui et al. (2014Matsui et al. ( , 2017 successfully improved the drift capacity of singly reinforced walls. ...