IALCCE 2014 - Program

Mini Symposia

MS1: Vibration-based health monitoring, damage identification and residual lifetime estimation for civil engineering structures

Geert Lombaert Geert Lombaert
(KU Leuven, Belgium)
Edwin Reynders Edwin Reynders
(KU Leuven, Belgium)
Costas Papadimitriou Costas Papadimitriou
(University of Thessaly, Greece)
Eleni Chatzi Eleni Chatzi
(ETH, Switzerland)

This mini-symposium deals with vibration-based health monitoring, damage identification and residual lifetime estimation for civil engineering structures (bridges and viaducts, buildings, wind turbines, towers, …).

In vibration-based structural health monitoring and damage identification (detection, localisation, quantification, and prognosis), an attempt is made to identify structural damage from vibration data of a structure. For civil engineering structures, data obtained under ambient excitation is often used due to the difficulties associated with the forced excitation of large structures. A distinction is made between model-based and non model-based damage identification methods, depending on whether the identification relies on a physical model, e.g. Finite Element model, of the structure. A two-stage procedure is often applied where (1) a black-box model of the structure is identified from time or frequency domain data and (2) features of the black-box model such as the modal parameters (natural frequencies, mode shapes) are used to update a physics-based model. This methodology can be used to identify damage as a local reduction of the stiffness in the structure or to tune the structural model, such that the response predictions are in line with the observed behaviour of the structure. The resulting model can be used to update response and reliability predictions, so as to estimate the residual lifetime of the structure.

This minisymposium welcomes novel contributions on vibration-based structural health monitoring, damage identification, as well as parameter identification, using black-box as well as physics-based models. Relevant topics are linear and nonlinear system identification, statistical system identification methods (maximum-likelihood, Bayesian inference) for parameter and state estimation, model updating and correlation, uncertainty quantification in parameter identification, model class selection based on system response data, stochastic simulation techniques for state estimation and model class selection, optimal strategies for experimental design, optimal sensor location methods, updating response and reliability predictions using data.

MS2: Integrative monitoring for the life-cycle performance of engineering structures

Alfred Strauss Alfred Strauss
(University of Natural Resources and Life Sciences, Austria)
Dan M. Frangopol Dan M. Frangopol
(Lehigh University, USA)

Integrative monitoring concepts become more and more important in the structural health diagnosis and prognosis, and life-cycle performance assessment of engineering structures. Integrative monitoring comprises early age inspection and damage detection methods as well as long term monitoring measures among others that supports in the intervention planning (e.g., maintenance, repair, rehabilitation, replacement) for new and existing structures. This mini symposium will provide a forum for international experts and researchers to discuss recent developments in integrative monitoring, for instance the development of smart monitoring systems, structural health diagnosis and prognosis approaches, in life-cycle performance assessment associated with monitoring based reliability methods. Participants will be able to share innovative ideas on the state-of-the-art, state-of-the-practice and future trends in integrative monitoring concepts.

MS3: Seismic performance evaluation of structures considering aging and deterioration

Yukihide Kajita
(Kyushu University, Japan)
Jamie Ellen Padgett
(Rice University, USA)
Takeshi Kitahara
(Kanto Gakuin University, Japan)

This mini-symposium focuses on seismic performance evaluation and seismic risk assessment of deteriorating structures affected by such factors as fatigue, corrosion of steel members, chloride damage of reinforced concrete members and others. The number of structures which need repair or upgrade will increases in the near future as structures and infrastructure continue to age and deteriorate. However, prompt repair or replacement cannot be performed for all structures because the budget is limited. Therefore, some structures wait their turn for the repair construction work. So, there is a possibility for a large earthquake to occur while a deteriorated structure awaits repair, and in general the field condition of structures exposed to earthquakes may vary widely depending upon their environmental exposure. This mini-symposium welcomes on papers that address related topics such as experimental studies on strength evaluation of deteriorating structural members, seismic response analyses on damaged or deteriorated structures, and seismic reliability and risk assessment of aged structures.

MS4: Challenges in real-world applications of structural health monitoring

Yozo Fujino
(The University of Tokyo, Japan)
Mitsuo Kawatani
(Kobe University, Japan)
Chul-Woo Kim
(Kyoto University, Japan)
Tomonori Nagayama
(The University of Tokyo, Japan)
Patrick J. McGetrick
(Kyoto University, Japan)
Tsukasa Mizutani
(The University of Tokyo, Japan)

Structural health monitoring (SHM) has been evaluated by bridge owners, as well as those in industry, as a possible method to improve the safety and reliability of structures and thereby reduce their operational cost. Structural health monitoring technology is perceived as a revolutionary method of determining the integrity of structures involving the use of multidisciplinary fields including sensors, materials, signal processing, system integration and signal interpretation. What we expect from SHM is not simply to detect structural failure, but also to provide an early indication of physical damage. The early warning provided by an SHM system can then be used to define remedial strategies before the structural damage leads to failure.
 

In spite of significant research activity, SHM technology has not yet been widely accepted by working level officials and bridge owners; this is probably caused by few satisfactory results in real-world applications. However, recent fast growing technologies in the fields of sensing, signal processing and pattern recognition have great potential to be incorporated for the successful real-world application of SHM technology.
 

The aim of this mini symposium is to provide a forum in which scientists and engineers from academia and industry can present their state-of-the-art research results on SHM technology, focusing on real-world applications. The mini symposium covers the following topics as well as relevant topics on challenges in real-world applications of SHM.

MS5: Modeling time-dependent behavior and deterioration of concrete

Roman Wendner
(University of Natural Resources and Life Sciences, Austria)
Gianluca Cusatis
(Northwestern University, USA)
Konrad Bergmeister
(University of Natural Resources and Life Sciences, Austria)

In recent years the topics of life-cycle engineering and life-cycle cost analyses have gained significantly in importance. Many concepts have been developed and presented by this and related engineering societies. Yet, accurate and physically based prediction models and modeling concepts for the time dependent behavior and deterioration of concrete, that form the basis for any life-time simulation, are still scarce. This Mini-Symposium will provide a forum for international experts and researchers to discuss recent developments. In particular, authors working on research related to creep and shrinkage, alkali-silica reaction, carbonatization, and the age-dependent change of mechanical properties are encouraged to submit abstracts. If you have any questions please feel free to contact Dr. Roman Wendner directly. (E-mail: roman.wendner@boku.ac.at)

MS6: Life-cycle performance of structural systems

Fabio Biondini
(Politecnico di Milano, Italy)
Dan M. Frangopol
(Lehigh University, USA)

Structural systems, due to their inherent vulnerability, are at risk from aging, fatigue and deterioration processes due to aggressive chemical attacks and other physical damage mechanisms. The detrimental effects of these phenomena can lead over time to unsatisfactory structural performance under service loadings or accidental actions and extreme events, such as natural hazards and man-made disasters. These problems pose a major challenge to the field of structural engineering, since the classical time-invariant structural design criteria and methodologies need to be revised to account for a proper modeling of the structural system over its entire life-cycle by taking into account the effects of deterioration processes, time-variant loadings, and maintenance and repair interventions under uncertainty. Despite these needs and recent research advances, life-cycle concepts are not yet explicitly addressed in structural design codes. Moreover, the level of structural performance is generally specified with reference to structural safety and reliability. However, when aging and deterioration are considered, the evaluation of the system performance should account for additional probabilistic indicators aimed to provide a comprehensive description of the life-cycle structural resources, such us structural redundancy, robustness and resilience. Based on these considerations The purpose of this Mini-Symposium is to present principles, concepts, methods and strategies for a life-cycle probability-based design that can effectively be implemented in practice for measuring and evaluating the life-cycle reliability, redundancy, robustness and resilience of deteriorating structural systems under multiple hazards, with emphasis on the interaction between seismic and environmental hazards.

Mini-Symposium organized on behalf of the SEI/ASCE Technical Council on Life-Cycle Performance, Safety, Reliability and Risk of Structural Systems, Task Group 1 on Life-Cycle Performance of Structural Systems under Uncertainty.

http://www.asce.org/sei/Content.aspx?id=23622324218

MS7: Tunnel life-cycle management and engineering including required performance of structures and facilities, prediction method in remaining life, risk management, maintenance technology, and inspection techniques

Atsushi Koizumi
(Waseda University, Japan)
Sadao Kimura
(Kanazawa Institute of Technology, Japan)
Hiroshi Dobashi
(Shutoko Engineering Co., Ltd., Japan)
Mitsugu Nomura
(CTI Engineering Co., Ltd, Japan)

This mini-symposium deals with life-cycle management and engineering including required performance of structures and facilities, prediction method in remaining life, risk management, maintenance technology and inspection techniques for existing tunnels.
The research in the field related to the required performance of the facility and tunnel structures, there is a research and performance evaluation methods and provision of required performance. The research relates to the field of residual life prediction, there is such research, such as probability prediction techniques using their inspection and evaluation results of the tunnel. The research relates to the field of risk management, there is such as research related to the extraction and evaluation of risk of specific tunnel. The research on maintenance technology, and there is research related to maintenance effective technology to tunnel. Further, in the field of inspection techniques, and the like studies of automation technology and non-destructive inspection techniques.
Not only research areas described above, this mini symposium welcomes the research of a wide range. For example, it is such as research papers plan related to underground structures, technology, and management.

MS8: Rehabilitation, retrofitting and redundancy of aged steel bridges

Teruhiko Yoda
(Waseda University, Japan)
Osamu Kiyomiya
(Waseda University, Japan)
Tongxiang An
(Waseda University, Japan)
Hideyuki Kasano
(Waseda University, Japan)
Weiwei Lin
(Waseda University, Japan)

In recent years, the rapid deterioration of steel bridge structures has become a serious technical and economic problem in many countries, including both developed and developing countries. After tens of years’ service, many of steel bridges become old and need to be strengthened integrally for the whole bridges or repaired locally for certain steel members. Considering the relatively high cost for replacing or strengthening integrally, as well as the great impact on the public transportation, preventive maintenance on the aged steel bridges is an effective way. Therefore, bridge inspection, maintenance, rehabilitation, retrofitting, resilience, sustainability as well as the redundancy evaluation has also become a very essential factor in contemporary bridge engineering. The section covers nearly all the important problems concerning steel bridge rehabilitation, such as bridge superstructures and substructures, the typical damage observed in steel bridges as well as the maintenance strategies. Besides, redundancy evaluation and life-cycle performance of the steel bridge structures are also coved in this Mini-Symposium.

MS9: Probabilistic modeling for the assessment, maintenance and rehabilitation of aging infrastructures

Konrad Bergmeister
(University of Natural Resources and Life Sciences, Austria)
Drahomír Novák
(Brno University of Technology, Czech Republic)
Alfred Strauss
(University of Natural Resources and Life Sciences, Austria)
Radomir Pukl
(Cervenka Consulting, Czech Republic)
Bretislav Teply
(Brno University of Technology, Czech Republic)
David Lehký
(Brno University of Technology, Czech Republic)
Jan Cervenka
(Cervenka Consulting, Czech Republic)

There exists a critical state of preservation of infrastructure systems in many countries today, and civil engineers are challenged to decide whether these weakened infrastructures can withstand an ongoing unrestricted usage, should be strengthened or must be deconstructed and finally replaced by new ones. Obviously and well-founded by economic reasons, strengthening and revitalization are preferred to deconstruction and rebuilt by responsible owners or agencies. In addition, there is a high interest in the accumulated experience taken from existing structures that can be used to integrate monitoring systems and predictive assessment for new structures.
In that context, the performance-related assessment and design of structures using powerful predictive models is a promising technique. It comprises for instance the definition of the performance characteristics of the material and structural components and to estimate how its resistance will change over time. This mini symposium will provide a forum for international experts and researchers to discuss recent developments in performance based modeling techniques, maintenance and rehabilitation techniques of aging infrastructures. It comprises for instance modern techniques of structural assessment, recalculation techniques of aged infrastructures to nowadays standards, practical applications of infrastructure strengthening and revitalization, residual life-time assessment considering time-variant damage mechanisms, specific strengthening techniques for aged infrastructures.
Participants will be able to share innovative ideas on the state-of-the-art, state-of-the-practice and future trends in performance based maintenance and rehabilitation concepts.

MS10: New trends in infrastructure management systems

Jose Campos e Matos
(Minho University, Portugal)
Dan M. Frangopol
(Lehigh University, USA)
Alfred Strauss
(University of Natural Resources and Life Sciences, Austria)
Drahomír Novák
(Brno University of Technology, Czech Republic)

According to OECD, a larger effort from countries will need to be directed towards maintenance and upgrading of existing infrastructure. However, it is verified that the GDP of OECD countries in infrastructure decreased in the last decades and, at same time, the quantity of mature infrastructure in developed countries increased substantially. Therefore, it is extremely important for countries to develop frameworks that would give them a reliable support for prioritizing their budget expenditures and investments in this topic.
 

Management systems for infrastructures are traditionally based in a cost-benefit analysis. In terms of costs, these frameworks need to include not only economic and financial costs, but also environmental and social costs. However, it is verified that these two sources of cost are not used in most of the LCC frameworks. Regarding the benefit analysis, advanced assessment algorithms that incorporate site monitoring data, are introduced in order to provide a reliable representation of evaluated infrastructures.
 

These frameworks can be applied in the management of a variety of infrastructures, such as highways, railways, buildings, airports and ports, etc. The objective of this mini-symposium is to present new trends that can be or that are already incorporated in advanced management systems, such as: (1) use of different sources of costs; (2) introducing accurate assessment algorithms; (3) incorporating reliability optimization algorithms; (4) use of permanent monitoring systems; (5) evaluating the robustness of infrastructure systems; and (6) quantification of different sources of uncertainty.

MS11: Life-cycle effects of surface penetrants on concrete structures

Hiroaki Tsuruta
(Kansai University, Japan)
Shinichi Miyazato
(Kanazawa Institute of Technology, Japan)

This mini-symposium focuses on the life-cycle effects and long life effects of surface penetrants or surface protection method on concrete structures. The effects and applying methods of surface penetrants, silicate type, silane type and other type, and surface protection method have been examined by many researchers and have been applied to real structures. Then their merits and demerits on inhibition of deterioration in concrete structures are also examined.
However their life-cycle effects on concrete structures never fail to be made clear. Therefore organizers hope that many researchers join our simposium and many examples of researches and applying are introduced in this mini-symposium.

MS12: Life-cycle performance based infrastructures maintenance

Airong Chen
(Tongji University, China)
Yong Yuan
(Tongji University, China)
Zhenliang Li
(Chongqing University, China)
Xin Ruan
(Tongji University, China)

Infrastructures are of significant importance to the functional societies. Basic requirements for normal society activities, such as transportation and power supply, are intensely related to the service conditions of infrastructures. To keep the service conditions of infrastructures to the demanded level, maintenance is imperative during the operation periods. Years of experience in the field of infrastructures maintenance indicates that proper maintenance strategies could be much more economically while maintaining the service conditions of infrastructures.

An efficient approach to obtain infrastructures maintenance strategies is to design the strategies based on the life-cycle performance analysis of the infrastructures. This mini-symposium focuses on life-cycle performance based infrastructures maintenance, and mainly considers three types of infrastructures:
- Mega bridges
- Long tunnels
- Lifeline systems and high-rise structures

MS13: Infrastructure system identification and monitoring

Ching-Tai Ng
(The University of Adelaide, Australia)
Siu-Kui Au
(University of Liverpool, United Kingdom)

Safety of infrastructures is a problem of major importance across a wide spectrum of industries. Within this context, system identification for updating structural conditions and monitoring for early stage damage detection of infrastructures are two important research areas to support lifecycle management of infrastructures. The session covers issues of theoretical, computational and practical nature. It provides a forum for researchers to exchange and experience of new developments in system identification for parameter and state estimation, smart sensors and actuators, model updating and correlation, modal identification, fault diagnosis and prognosis, nondestructive evaluation, optimal sensor and actuator location methods, and advanced algorithms for inverse problems.