Yoshio Fukuda, Maria Q. Feng, Masanobu Shinozuka,
... Professor.Search for more papers by this authorMasanobu Shinozuka, Masanobu Shinozuka Department of Civil and Environmental Engineering, University ... Professor.Search for more papers by this authorMasanobu Shinozuka, Masanobu Shinozuka Department of Civil and Environmental Engineering, University of ...
Tópico(s): Advanced Fiber Optic Sensors
2009 - Wiley | Structural Control and Health Monitoring
Alessandro Baratta, Isaac Elishakoff, Giulio Zuccaro, Masanobu Shinozuka,
This paper deals with seismic excitation of linearly elastic structures. It is well known that dynamical structural response is very sensitive to random fluctuations of the excitation; the consequence is that the identification of the forcing function on the basis of a few ‘global’ parameters does not allow to predict exhaustively stresses in seismically excited structures. In the paper, a convex model is established to treat uncertainty associated with the ‘details’ of the excitation, in order to ...
Tópico(s): Seismic Performance and Analysis
1998 - Wiley | Earthquake Engineering & Structural Dynamics
Konstantinos G. Papakonstantinou, C.P. Andriotis, Masanobu Shinozuka,
Scheduling of inspection and maintenance policies during the life-cycle of operating infrastructure necessitates optimization of long-term objectives in stochastic environments. Modern answers to the problem should focus on quantitative decision-making techniques, taking advantage of informative but uncertain data that become available in time. As such, the problem is efficiently addressed within the framework of stochastic dynamic programming by means of Partially Observable Markov Decision Processes ( ...
Tópico(s): Reliability and Maintenance Optimization
2018 - Taylor & Francis | Structure and Infrastructure Engineering
Masanobu Shinozuka, Samit Ray‐Chaudhuri, Sudib Kumar Mishra,
Optimization of isolation system involves a trade-off between the isolation efficiency and isolator displacement to ensure optimal performance. Quite often, the latter aspect is overruled, even though, large isolator displacements are known to be linked with adverse consequences. A class of smart material referred as Shape Memory Alloy (SMA) has recently been proposed to supplement the conventional isolation bearings that is shown to facilitate such trade-off, owing to its Superelastic property. ...
Tópico(s): Structural Engineering and Vibration Analysis
2015 - Elsevier BV | Probabilistic Engineering Mechanics
Konstantinos G. Papakonstantinou, Masanobu Shinozuka,
Stochastic control methods have a history of implementation in risk management and life-cycle cost procedures for civil engineering structures. The synergy of stochastic control methods and Bayesian principles can result in Partially Observable Markov Decision Processes (POMDPs) that allow consideration of uncertainty within the entire domain of the model and expand available policy options compared to other state-of-the art methods. The superior attributes of POMDPs enable optimum decisions which ...
Tópico(s): Reliability and Maintenance Optimization
2014 - Elsevier BV | Probabilistic Engineering Mechanics
Konstantinos G. Papakonstantinou, Masanobu Shinozuka,
The overall objective of this two part study is to highlight the advanced attributes, capabilities and use of stochastic control techniques, and especially Partially Observable Markov Decision Processes (POMDPs), that can address the conundrum of planning optimum inspection/monitoring and maintenance policies based on stochastic models and uncertain structural data in real time. In this second part of the study a distinct, advanced, infinite horizon POMDP formulation with 332 states is cast and solved, ...
Tópico(s): Probabilistic and Robust Engineering Design
2014 - Elsevier BV | Reliability Engineering & System Safety
Konstantinos G. Papakonstantinou, Masanobu Shinozuka,
To address effectively the urgent societal need for safe structures and infrastructure systems under limited resources, science-based management of assets is needed. The overall objective of this two part study is to highlight the advanced attributes, capabilities and use of stochastic control techniques, and especially Partially Observable Markov Decision Processes (POMDPs) that can address the conundrum of planning optimum inspection/monitoring and maintenance policies based on stochastic models ...
Tópico(s): Infrastructure Maintenance and Monitoring
2014 - Elsevier BV | Reliability Engineering & System Safety
Konstantinos G. Papakonstantinou, Masanobu Shinozuka,
The problem of updating the parameters of a probabilistic model, describing spatially large structures, based on uncertain output information is analyzed. An unscented Kalman filter (UKF) variant is successfully used, although the analysis has not been cast in a filtering format. The performance of the UKF-variant is compared with other generic gradient-free inverse solvers. To reduce the computational demand of the stochastic model, sensitivity analysis for functional inputs and probabilistic homogenization ...
Tópico(s): Structural Health Monitoring Techniques
2013 - Elsevier BV | Computers & Structures
Konstantinos G. Papakonstantinou, Masanobu Shinozuka,
A probabilistic model for chloride induced corrosion of the reinforcing steel in concrete structures is presented in this work. The main purpose of this model is to simulate the complex phenomena involved in a detailed yet simple way, appropriate for implementation on large-scale, real structures. Addressing this problem a time-dependent model is developed that can simulate all stages of reinforced concrete corrosion, i.e. corrosion initiation, crack initiation and propagation. The novelties of ...
Tópico(s): Infrastructure Maintenance and Monitoring
2013 - Elsevier BV | Engineering Structures
Jeong‐Tae Kim, Duc-Duy Ho, Khac-Duy Nguyen, Dong-Soo Hong, Sung Woo Shin, Chung‐Bang Yun, Masanobu Shinozuka,
In this paper, system identification of a cable-stayed bridge in Korea, the Hwamyung Bridge, is performed using vibration responses measured by a wireless sensor system. First, an acceleration based-wireless sensor system is employed for the structural health monitoring of the bridge, and wireless sensor nodes are deployed on a deck, a pylon and several selected cables. Second, modal parameters of the bridge are obtained both from measured vibration responses and finite element (FE) analysis. Frequency ...
Tópico(s): Ultrasonics and Acoustic Wave Propagation
2013 - Technopress | Smart Structures and Systems
Behrouz Shafei, Alice Alipour, Masanobu Shinozuka,
Abstract This article presents a stochastic computational framework to investigate the chloride‐induced corrosion of reinforced concrete superstructures. For this purpose, three‐dimensional finite‐element models are developed to determine the extent of chloride penetration into the superstructure components. One of the unique capabilities of this framework is to simultaneously consider all the major factors that affect the corrosion process. Furthermore, the developed framework integrates various ...
Tópico(s): Infrastructure Maintenance and Monitoring
2013 - Wiley | Computer-Aided Civil and Infrastructure Engineering
James R. Xue, Masanobu Shinozuka,
This study presents rubberized concrete composite as a new structural material aiming for an enhanced energy dissipation capability and thus improved seismic performance by mixing recycled rubber crumb with concrete. While rubberized concrete is not new, this study represents the first investigation on damping and dynamic (including seismic) behaviors of rubberized concrete for its potential application as structural material. Small-scale column models were fabricated using rubberized concrete with ...
Tópico(s): Innovations in Concrete and Construction Materials
2013 - Elsevier BV | Construction and Building Materials
Marco Torbol, Masanobu Shinozuka,
This study introduces the directionality effect of the ground motion in the probabilistic seismic risk assessment (PSRA) of lifeline systems. Given an earthquake scenario, the seismic wave strikes each component of the system with a different angle. The angle may vary significantly depending on the shape, the location and the orientation of the structure. An appropriate example of a lifeline system is a highway transportation network, in which under earthquake conditions the bridges are considered ...
Tópico(s): Structural Response to Dynamic Loads
2012 - Taylor & Francis | Structure and Infrastructure Engineering
Duc-Duy Ho, Po-Young Lee, Khac-Duy Nguyen, Dong-Soo Hong, So‐Young Lee, Jeong‐Tae Kim, Sung-Woo Shin, Chung‐Bang Yun, Masanobu Shinozuka,
In this paper, solar-powered, multi-scale, vibration-impedance sensor node on Imote2 platform is presented for hybrid structural health monitoring (SHM) in cable-stayed bridge. In order to achieve the objective, the following approaches are proposed. Firstly, vibration- and impedance-based hybrid SHM methods are briefly described. Secondly, the multi-scale vibration and impedance sensor node on Imote2-platform is presented on the design of hardware components and embedded software for vibration- ...
Tópico(s): Smart Materials for Construction
2012 - Technopress | Smart Structures and Systems
Marco Torbol, Masanobu Shinozuka,
SUMMARY This study examines the effect of the angle of seismic incidence θ on the fragility curves of bridges. Although currently, fragility curves of bridges are usually expressed only as a function of intensity measure of ground motion ( IM ) such as peak ground acceleration, peak ground velocity, or S a ( ω 1 ), in this study they are expressed as a function of IM with θ as a parameter. Lognormal distribution function is used for this purpose with fragility parameters, median c m and standard deviation ...
Tópico(s): Structural Health Monitoring Techniques
2012 - Wiley | Earthquake Engineering & Structural Dynamics
Alice Alipour, Behrouz Shafei, Masanobu Shinozuka,
A multihazard reliability-based framework is developed through this study to evaluate the structural response of RC bridges under the combined effects of pier scour and earthquake events. This framework is used to calibrate the scour load-modification factors for the design of bridges located in high seismic areas. Toward this goal, a series of case study bridges are investigated. For each bridge case, the joint probability of failure owing to scour and earthquake hazards is determined for a range ...
Tópico(s): Dam Engineering and Safety
2012 - American Society of Civil Engineers | Journal of Bridge Engineering
Leiting Dong, Sergio Carnalla, Masanobu Shinozuka,
To evaluate the potential of detecting leakage of water pipes using ground-penetrating radar (GPR), a lab experiment is conducted as well as numerical modeling. In the experiment, an artificial 'leakage' is put under, beside and above a pipe buried in dry soil, simulating different leakage locations. By scanning such an experimental model using commercial GPR, more understanding is gained regarding the signature of leakage in GPR profile. Compared to a distinct hyperbola as shown in GPR profile of ...
Tópico(s): Seismic Waves and Analysis
2012 - SPIE | Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE
Jong-Han Lee, Hoai-Nam Ho, Masanobu Shinozuka, Jong-Jae Lee,
This paper introduces an advanced vision-based system for dynamic real-time displacement measurement of high-rise buildings using a partitioning approach. The partitioning method is based on the successive estimation of relative displacements and rotational angles at several floors using a multiple vision-based displacement measurement system. In this study, two significant improvements were made to realize the partitioning method: (1) time synchronization, (2) real-time dynamic measurement. Displacement ...
Tópico(s): Advanced Fiber Optic Sensors
2012 - IOP Publishing | Smart Materials and Structures
Debasis Karmakar, Samit Ray‐Chaudhuri, Masanobu Shinozuka,
For a proper prediction of wind-induced vibrations of a long suspension bridge, it is necessary to use a representative wind velocity profile at the bridge site. However, as the simultaneous collection of wind velocity data at closely spaced locations of the entire bridge is not a viable option, simulation has become a powerful tool for this purpose. In this study, a new iterative approach of non-Gaussian conditional simulation is proposed to conditionally simulate the wind velocity profiles by ...
Tópico(s): Structural Health Monitoring Techniques
2011 - Elsevier BV | Probabilistic Engineering Mechanics
Alice Alipour, Behrouz Shafei, Masanobu Shinozuka,
This article provides a comprehensive procedure for the structural performance evaluation and life-cycle cost (LCC) analysis of reinforced concrete highway bridges located in extreme chloride-laden environments. An integrated computational methodology is developed to simulate the chloride intrusion and to estimate the corrosion initiation time. The effects of various influential parameters on the chloride diffusion process are examined and the changes in geometry and material properties of structural ...
Tópico(s): Infrastructure Maintenance and Monitoring
2011 - Taylor & Francis | Structure and Infrastructure Engineering
Behrouz Shafei, Alice Alipour, Masanobu Shinozuka,
Tópico(s): Concrete and Cement Materials Research
2011 - Elsevier BV | Cement and Concrete Research
Swagata Basu, Masanobu Shinozuka,
It is difficult to incorporate multidimensional effect of the ground motion in the design and response analysis of structures. The motion trajectory in the corresponding multi-dimensional space results in time variant principal axes of the motion and defies any meaningful definition of directionality of the motion. However, it is desirable to consider the directionality of the ground motion in assessing the seismic damageability of bridges which are one of the most vulnerable components of highway ...
Tópico(s): Geotechnical Engineering and Underground Structures
2011 - Hindawi Publishing Corporation | Advances in Civil Engineering
Ung Jin Na, Seung-Jun Kwon, Samit Ray‐Chaudhuri, Masanobu Shinozuka,
Tópico(s): Structural Behavior of Reinforced Concrete
2011 - Springer Science+Business Media | KSCE Journal of Civil Engineering
Süleyman Adanur, Ayman S. Mosallam, Masanobu Shinozuka, Levent Gümüşel,
Fiber reinforced polymer (FRP) composites offer many attractive and unique features for existing and new bridges. Among these features are light weight, high stiffness-to-weight and strength-to-weight ratios, damping capabilities, and high resistance to environmental degradation when properly designed and installed. This article presents a pilot numerical study aiming at evaluating the feasibility of using FRP composites in suspension bridge applications. This was accomplished by comparing the response ...
Tópico(s): Concrete Corrosion and Durability
2011 - SAGE Publishing | Journal of Reinforced Plastics and Composites
Masanobu Shinozuka, Pai H. Chou, Sehwan Kim, Hong Rok Kim, Eunbae Yoon, Hadil Mustafa, Debasis Karmakar, Selim Pul,
A MEMS-based wireless sensor network (WSN) is developed for nondestructive monitoring of pipeline systems. It incorporates MEMS accelerometers for measuring vibration on the surface of a pipe to determine the change in water pressure caused by rupture and the damage location. This system enables various sensor boards and camera modules to be daisychained underground and to transmit data with a shared radio board for data uplink. Challenges include reliable long-range communication, precise time synchronization, ...
Tópico(s): Underwater Vehicles and Communication Systems
2010 - SPIE | Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE
Masanobu Shinozuka, Pai H. Chou, Sehwan Kim, Hong Rok Kim, Debasis Karmakar, Fei Lu,
This paper presents the results of a pilot study and verification of a concept of a novel methodology for damage detection and assessment of water distribution system. The unique feature of the proposed noninvasive methodology is the use of accelerometers installed on the pipe surface, instead of pressure sensors that are traditionally installed invasively. Experimental observations show that a sharp change in pressure is always accompanied by a sharp change of pipe surface acceleration at the corresponding ...
Tópico(s): Water Quality Monitoring Technologies
2010 - Technopress | Smart Structures and Systems
Alice Alipour, Behrouz Shafei, Masanobu Shinozuka,
This paper studies the life-cycle performance and cost of reinforced concrete highway bridges subjected to earthquake ground motions while they are continuously exposed to the attack of chloride ions. The penetration of chloride ions into the concrete is simulated through a finite difference approach that takes into account all the parameters that can affect the corrosion process. From simulation results, the corrosion initiation time is predicted, and the extent of structural degradation is calculated ...
Tópico(s): Structural Behavior of Reinforced Concrete
2010 - American Society of Civil Engineers | Journal of Bridge Engineering
Ung Jin Na, Samit Ray‐Chaudhuri, Masanobu Shinozuka,
Past experience has shown that ports are often susceptible to severe damage during earthquakes. From field damage data of 1995 Kobe earthquake, it is observed that the seismic behavior of port structures shows significant variability. In this study, a 2D numerical model, representing PC1 berth located in Port Island, Kobe and damaged in the 1995 Kobe earthquake, has been developed and used to simulate seismic behavior. It has been found that the uncertainties in the friction angle and the shear ...
Tópico(s): Geotechnical Engineering and Soil Stabilization
2007 - Elsevier BV | Soil Dynamics and Earthquake Engineering
Nobuhiko Shiraki, Masanobu Shinozuka, James E. Moore, Stephanie E. Chang, Hiroyuki Kameda, Satoshi Tanaka,
Monte Carlo simulation techniques are used with bridge fragility curves to evaluate bridge damage in terms of a bridge damage index, and highway network link damage in terms of a link damage index. Static, user-equilibrium analysis is used to evaluate total transportation network delay due to seismically induced damage inflicted on the Los Angeles and Orange County State highway and freeway network. A method of regional seismic risk analysis for highway systems is developed based on the definition ...
Tópico(s): Traffic control and management
2007 - American Society of Civil Engineers | Journal of Infrastructure Systems
Jianwen Liang, Samit Ray‐Chaudhuri, Masanobu Shinozuka,
This paper presents a rigorous derivation of a previously known formula for simulation of one-dimensional, univariate, nonstationary stochastic processes integrating Priestly’s evolutionary spectral representation theory. Applying this formula, sample functions can be generated with great computational efficiency. The simulated stochastic process is asymptotically Gaussian as the number of terms tends to infinity. This paper shows that (1) these sample functions accurately reflect the prescribed ...
Tópico(s): Complex Systems and Time Series Analysis
2007 - American Society of Civil Engineers | Journal of Engineering Mechanics