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Introduction
Published in Lina Bertling Tjernberg, Infrastructure Asset Management with Power System Applications, 2018
The electric power system is being modernized to enable a sustainable energy system. New developments include possibilities and challenges with generation, delivery, and usage of electricity as an integrated part of the energy system. This involves new forms of usage of electricity, for example, for transportation and demand response, and to the updating of existing electricity infrastructures. For electricity generation, the trend is toward new large-scale developments like offshore wind farms, as well as small-scale developments like rooftop solar energy. At the same time, digitalization of society is creating new opportunities for control and automation as well as new business models and energy related services. The overall trend for technology developments is new possibilities for measurement and control. An example is Phasor Measurements Units (PMUs), generally located in the transmission network, which provide measurements of voltage and current up to 30–120 times per second. Smart Meters placed with the end consumer, which enable integration of private small-scale electricity production from solar cells or energy storage from electric vehicles and general distributed control of energy use, are others. Another trend is the development of diagnostic measurement techniques for assessing the insulation condition and prediction of lifetime of physical assets, and new methods for condition monitoring, for example, using sensor networks. These different trends have in common an overall development towards access to large volumes of data for handling and analysis, and another concept growing in interest is referred to as Big Data, which provides new means for infrastructure asset management.
A mathematical programming approach to railway network asset management
Published in Stein Haugen, Anne Barros, Coen van Gulijk, Trond Kongsvik, Jan Erik Vinnem, Safety and Reliability – Safe Societies in a Changing World, 2018
The railway system is the result of the interaction of a number of different systems and infrastructure with the ultimate aim of transporting people and goods safely and on time. It consists of a diverse portfolio of assets, each bounds to deliver a specific function but all together contributing to ultimately provide a reliable and safe service. Each railway asset is subject to degradation and failure processes, and maintenance is performed in order to control the state of the assets and ensure that each asset’s function is performed to the required standard. Maintenance policies are developed as a combination of periodic inspection, routine and emergency maintenance, enhancement and renewal activities, and these are specific to each railway asset. As maintenance resources and budget are limited, decisions have to be made on how to optimally allocate the available resources among all the asset on the network. Infrastructure asset management is the process of allocating maintenance resources among the assets comprising the system with the aim of minimising the whole-life costs while maximising the system performance. Optimal asset management involves decision making and selection of the best intervention strategy for each asset along the network in order to ensure that the required level of service reliability and safety risk is achieved within budget. Determining the best set of strategies for a given network does not simply consist in choosing the strategy which is optimal for each asset. When a network perspective is adopted dependencies among different assets and different sections of the network arise, due for example to resource availability. This implies that intervention strategies that are optimal when an asset is considered individually, might not be optimal when decisions are made at a network level.
Risk-informed asset management to tackle scouring on bridges across transport networks
Published in Structure and Infrastructure Engineering, 2022
Manu Sasidharan, Ajith Kumar Parlikad, Jennifer Schooling
Assets are items with value and could be either tangible (such as bridges, buildings, equipment) or intangible (such as human capital, royalty). ISO 55000 defines asset management as ‘the coordinated activity of an organisation to realise value from assets’. Asset management policies thus cover social, economic and technical attributes of the asset, and is a process spanning across its service-life (Van Der Westhuizen & Grabe, 2013). When it comes to asset-centric industries like transportation, asset management is predominantly focused on the infrastructure involved (e.g. bridges, roads, railway track, signalling etc.). In principle, infrastructure asset management can be viewed as a decision-making process that aims to satisfy service and quality while minimising costs and effects. Setting priorities for maintenance and rehabilitation consumes most of the available funding for bridges and requires evaluation at both network level (i.e. which bridge within the network to maintain) and the project level (i.e. which maintenance strategy to be adopted for a given bridge). The decision-making at the network level is governed by multiple bridge performance indicators such as structural health of the bridge, safety and security of users and workers, environmental impact, socio-economic impact on the users, and impact on agency’s reputation (Allah Bukhsh, Stipanovic, Klanker, O’Connor, & Doree, 2019; Frangopol, Dong, & Sabatino, 2017; Yavuz, Attanayake, & Aktan, 2017).
Client-driven performance-evaluation framework for municipal infrastructure
Published in Structure and Infrastructure Engineering, 2022
Khaled Shahata, Samer El-Zahab, Tarek Zayed, Ghasan Alfalah
Public and private agencies try to always maintain their infrastructure assets in good and serviceable condition at the minimum cost; therefore, they practice infrastructure asset management. However, a few decades back, most of Canada’s infrastructure systems reached the end of their lifecycle, and the demands placed on them started to rapidly increase in the mid-1960s. In the United States of America, the environmental protection agency estimates that $472.6 billion are required for the maintenance and improvement of the drinking water infrastructure in the United States between the years of 2015 and 2035 (Grigg, 2015). For example, the Canadian Infrastructure Report Card shows that 25% of the Canadian potable water infrastructure is in fair, poor, or very poor conditions. Therefore, the infrastructure agencies started to focus on a systems approach for infrastructure management. This process has led to the development of asset management. The process started with the development of the pavement management system (PMS) and continued with the bridge management system and the infrastructure management system. Recently, it has evolved into asset management (Wu, Flintsch, Ferreira, & Picado-Santos, 2012). This concept has further evolved into integrated asset management where multiple assets were managed together for the most optimal outcome (Shahata & Zayed, 2016).
Resilient storm pipes: a multi-stage decision support system
Published in Structure and Infrastructure Engineering, 2020
Luis Amador, Alireza Mohammadi, Soliman Abu-Samra, Reza Maghsoudi
Infrastructure is the foundation of our daily lives. It comprises all the buildings and facilities that provide necessary services such as; but not limited to, transportation systems (i.e., roads, airports, rail facilities, pavements, metro, bridges, etc.), pipe networks (water distribution, stormwater drainage and wastewater collection and treatment systems), and energy supply and telecommunication grids among others. All these assets should be properly preserved and maintained throughout their life-cycles to support the living environment and encourage economic development. Historically, pavements were the first assets that received attention in the 1980s in terms of designing a management system to ensure they last longer given their short lifespan as opposed to other systems such as; pipes, bridges, etc. Thenceforth, with the success of pavement management systems, new management systems were developed for other assets such as; bridges and pipe networks (Haas, Hudson, & Zaniewski, 1994). Infrastructure asset management is the process of evaluating thousands of possible maintenances, rehabilitation and upgrading alternatives throughout the assets’ life-cycle with an attempt of maintaining an adequate level of service (Tessier & Haas 1997). Since the late 20th century, global attention has been paid to infrastructure management systems and their economic benefits (Vanier & Rahman, 2004). Governments and federal agencies realized the financial savings of preserving and maintaining the assets throughout their life-cycles (NAMS, 2006).