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Article
Publication date: 6 October 2020

Samantha Louise N. Jarder, Lessandro Estelito O. Garciano and Osamu Maruyama

Buried structures like pipeline systems or water distribution networks (WDN) are vulnerable to seismic activities and the risk of damages increases when there is…

Abstract

Purpose

Buried structures like pipeline systems or water distribution networks (WDN) are vulnerable to seismic activities and the risk of damages increases when there is liquefaction. This paper aims to propose a methodology on how to determine the probable maximum loss (PML) on pipeline systems when earthquakes and liquefaction occur in future scenarios.

Design/methodology/approach

The paper used historical data and presents a case study on how the methodology to estimate the PML was used. The estimation is analytic and relied on simulations to determine the seismic and liquefaction hazard in the study area. Statistical and numerical analysis was used to estimate the damages and losses.

Findings

The output shows the PML of a WDN at different earthquake scenarios. It also shows a comparison between the damages and losses of diameter sizes of the pipes.

Research limitations/implications

In this paper, the damages behaved independently in one area, and correlation was not considered.

Practical implications

This PML methodology can aid in pre-disaster planning to prepare for seismic countermeasures risk transfer such as insurance to reduce the loss.

Originality/value

This paper shows a methodology and example on how to estimate the damages and PMLs of an existing WDN of a projected earthquake and liquefaction hazard based on historical data.

Details

International Journal of Disaster Resilience in the Built Environment, vol. 12 no. 2
Type: Research Article
ISSN: 1759-5908

Keywords

Article
Publication date: 2 October 2020

Abraham Matthew Sagum Carandang, Lessandro Estelito O. Garciano, Osamu Maruyama and Richard De Jesus

Water distribution networks (WDNs) must deliver water to its customers 24/7. Disruption of this important service after a strong seismic event impedes post-disaster…

Abstract

Purpose

Water distribution networks (WDNs) must deliver water to its customers 24/7. Disruption of this important service after a strong seismic event impedes post-disaster activities and poses health and sanitation problems. Hence, WDNs must be able to quickly restore services after the occurrence of a major seismic event. This ability to return the water service can be a metric for resilience. The purpose of this paper is to quantify the resilience by developing a framework that translates various restoration strategies into an improved resilience measure for a multisource WDN.

Design/methodology/approach

This paper used a quantitative risk assessment method in developing the framework for the resilience quantification of WDN. Prim’s algorithm, Horn’s algorithm and maximum slope method are used for the restoration analysis conducted in this study.

Findings

This paper provides resilience indices of the WDN for each repair scenarios. Then, the resilience indices are used to determine the most efficient and optimized repair scenario to restore the hypothetically damaged WDN owing to Level 1 and Level 2 seismic events.

Research limitations/implications

The developed framework of this study only focuses on the robustness, rapidity and resourcefulness properties of resilience.

Practical implications

This study aims to help the water district in the maintenance, repair and evaluation of WDN against seismic events. The results from the study can be used in preparing the disaster management plan of the local water district to repair possible pipelines. This study also serves as a starting point to more complex and comprehensive research about the resilience quantification of WDNs with the consideration of optimal restoration sequence in the future.

Originality/value

The developed framework in the resilience quantification of WDN is original, as it uses optimal restoration strategies to represent the rapidity property of resilience.

Details

International Journal of Disaster Resilience in the Built Environment, vol. 12 no. 3
Type: Research Article
ISSN: 1759-5908

Keywords

Article
Publication date: 14 January 2020

Jan Mae Nigos Cariño and Lessandro Estelito O. Garciano

Schools are vulnerable to strong-magnitude earthquakes. The purpose of this study is to develop a seismic evacuation safety index (ESI) to assess school’s safety as a…

Abstract

Purpose

Schools are vulnerable to strong-magnitude earthquakes. The purpose of this study is to develop a seismic evacuation safety index (ESI) to assess school’s safety as a function of the following parameters: means of egress, disaster preparedness and disaster response. Moreover, the study aims to simulate and study an evacuation model to estimate evacuation time for a realistic understanding of the evacuation processes.

Design/methodology/approach

The paper used a semi-quantitative risk assessment method in developing the ESI. This was used to evaluate schools and classify them according to their level of evacuation safety. To estimate the evacuation time of each school, cellular automata theory and static floor field were used.

Findings

The paper provides primary school stakeholders important parameters that they should consider in preparing pre-disaster plans to ensure safe evacuation of school children.

Research limitations/implications

ESI focuses only on the means of egress, disaster preparedness and disaster response as the contributing factors. The structural conditions of each school building and assessment of non-structural elements are not considered.

Practical implications

The ESI and the evacuation model can be used as a basis for evacuation planning and decision-making. This can help building owners and administrators in strengthening their disaster risk management plan by enforcing mitigating measures.

Originality/value

ESI is an original idea and fills the gap regarding the safe evacuation of school children especially during a major seismic event.

Details

International Journal of Disaster Resilience in the Built Environment, vol. 11 no. 3
Type: Research Article
ISSN: 1759-5908

Keywords

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