Redundancy index of lifelines for mitigation measures against seismic risk

Hoshiya, Masaru; Yamamoto, Kinya; Ohno, Haruo

doi:10.1016/j.probengmech.2004.02.003

Cited by 16 publications

(8 citation statements)

References 7 publications

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“…It has been noted that there is a lack of research into the redundancy concept in the case of road transport networks compared with other networks, such as water distribution networks and power networks. For example, there are several indices (Yazdani, Jeffrey 2012;Javanbarg, Takada 2007;Awumah et al 1991;Hoshiya et al 2004) that have been developed to investigate the redundancy in the water distribution network using the entropy concept.…”

Section: Survey Of Redundancy Measuresmentioning

confidence: 99%

The Evaluation of Redundancy for Road Traffic Networks

Rashidy

Grant-Muller

2016

Transport

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This paper presents two redundancy indices for road traffic network junctions and also an aggregated network redundancy index. The proposed redundancy indices could be implemented to identify optimal design alternatives during the planning stage of the network junctions whereas the aggregated network redundancy index could assess the best control and management policies under disruptive events. Furthermore, effective measures of network redundancy are important to policy makers in understanding the current resilience and future planning to mitigate the impacts of greenhouse gases. The proposed junction indices cover the static aspect of redundancy, i.e. alternative paths, and the dynamic feature of redundancy reflected by the availability of spare capacity under different network loading and service level. The proposed redundancy indices are based on the entropy concept, due to its ability to measure the system configuration in addition to being able to model the inherent uncertainty in road transport network conditions. Various system parameters based on different combinations of link flow, relative link spare capacity and Relative Link Speed (RLS) were examined. However, the two redundancy indices developed from the combined RLS and relative link spare capacity showed strong correlation with junction delay and volume capacity ratio of a synthetic road transport network of Delft city. Furthermore, the developed redundancy indices responded well to demand variation under the same network conditions and supply variations. Another case study on Junction 3A in M42 motorway near Birmingham demonstrated that the developed redundancy index is able to reflect the impact of the Active Traffic Management (ATM) scheme introduced in 2006.

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Section: Survey Of Redundancy Measuresmentioning

confidence: 99%

The Evaluation of Redundancy for Road Traffic Networks

Rashidy

Grant-Muller

2016

Transport

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“…The proposed framework was extensively applied to the 20-pipe water supply network shown in Figure 12 [21]. The network is part of a larger water supply system in Kobe, Japan, and consists of 120 service reservoirs, although water is supplied to the area shown in the figure from only one reservoir.…”

Section: -Pipe Water Supply Network In Kobe Citymentioning

confidence: 99%

Computer‐Aided Analysis of Flow in Water Pipe Networks after a Seismic Event

Kang

Lee

Zhang

2017

Mathematical Problems in Engineering

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This paper proposes a framework for a reliability-based flow analysis for a water pipe network after an earthquake. For the first part of the framework, we propose to use a modeling procedure for multiple leaks and breaks in the water pipe segments of a network that has been damaged by an earthquake. For the second part, we propose an efficient system-level probabilistic flow analysis process that integrates the matrix-based system reliability (MSR) formulation and the branch-and-bound method. This process probabilistically predicts flow quantities by considering system-level damage scenarios consisting of combinations of leaks and breaks in network pipes and significantly reduces the computational cost by sequentially prioritizing the system states according to their likelihoods and by using the branch-and-bound method to select their partial sets. The proposed framework is illustrated and demonstrated by examining two example water pipe networks that have been subjected to a seismic event. These two examples consist of 11 and 20 pipe segments, respectively, and are computationally modeled considering their available topological, material, and mechanical properties. Considering different earthquake scenarios and the resulting multiple leaks and breaks in the water pipe segments, the water flows in the segments are estimated in a computationally efficient manner.

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“…A part of water distribution network of Kobe city, which has been used in several case studies for calculation of redundancy indices by Hoshiya et al [15] and Javanbarg [8,12,27,28], was considered in order to evaluate efficiency of the proposed entropy function. Kobe water supply department has constructed a new transmission system through the downtown area ( Figure 14) which is a backup facility for the existing transmission pipelines and can supply water to the existing links and demand nodes directly.…”

Section: The Case Studymentioning

confidence: 99%

“…Based on their proposed redundancy index, Hoshiya et al [15] calculated redundancy index of the present network and the strengthened network, and this index amounts to 0.563 and 0.598, respectively. They concluded that the network performance had improved by 6.2 %.…”

Section: The Case Studymentioning

confidence: 99%

Reliability assessment of water distribution network by means of informational entropy using design/hydraulic parameters

2017

JCE

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Reliability assessment of water distribution network by means of informational entropy using design/hydraulic parameters A modified entropy-based criterion for evaluating reliability of water distribution networks is presented in the paper. Design and hydraulic parameters, as well as failure probabilities for individual links, are considered. For this purpose, a new weighting factor is defined based on the proportion of total outflow at each node to the total network dissipated power. Another weighting factor is defined based on the relation between the flow rate of a link and the total flow rates in the network, to take into account the capacity of individual links, as compared to that of the overall network. Ocjena pouzdanosti vodoopskrbne mreže pomoću informacijske entropije primjenom projektnih/hidrauličkih parametara U radu se prikazuje primjena kriterija temeljenog na svojstvu entropije za ocjenjivanje pouzdanosti vodoopskrbne mreže. Pri tome se u obzir uzimaju projektni i hidraulički parametri te vjerojatnost potpunog ispada iz rada (otkazivanja) cjevovoda. Na temelju odnosa ukupnog izlaznog protoka iz pojedinog čvora i ukupnog gubitka snage, u čitavoj mreži definiran je novi ponderski faktor. Definiran je i dodatni ponderski faktor koji se temelji na odnosu protoka u pojedinoj dionici i ukupnom protoku u mreži, pri čemu se u obzir uzima protočni kapacitet pojedine dionice u odnosu na cjelokupnu mrežu.Ključne riječi: vodoopskrbna mreža, ocjena pouzdanosti, projektni i hidraulični parametri, informacijska entropija Vorherige Mitteilung

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Redundancy index of lifelines for mitigation measures against seismic risk

Cited by 16 publications

References 7 publications

The Evaluation of Redundancy for Road Traffic Networks

The Evaluation of Redundancy for Road Traffic Networks

Computer‐Aided Analysis of Flow in Water Pipe Networks after a Seismic Event

Reliability assessment of water distribution network by means of informational entropy using design/hydraulic parameters

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