Prioritization of Bridges to Improve Emergency Road Network Performance after the Earthquake

Alireza Shooreshi,Hassan Zoghi,Eleftherios K Anastasiou

doi:10.1155/2021/5519700

Alireza Shooreshi, Hassan Zoghi + Show 1 more

Open Access

https://doi.org/10.1155/2021/5519700

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Abstract

Following an earthquake, the issue of relief, mainly in metropolises, where the extent and depth of the devastation can be widespread, is crucial. Meanwhile, urban roads including the bridges as major arteries play an essential role after the earthquake. Bridges also have a unique role in making disaster response routes network efficient. Therefore, it is necessary to ensure their full performance in disasters such as earthquakes. On the other hand, maintaining this function for all bridges in a network requires huge costs, which is generally impossible. This study aims to assess the selection and prioritization of bridges for retrofitting according to their importance and role in helping disaster response routes network. In this paper, to prioritize bridges in an emergency road network, a five-stage methodology is presented using analytical methods and an optimization model. Given the importance of network length and critical points connectivity in the efficiency of the emergency road network, the probability of failure, network length, and travel time have been used as major indicators in prioritizing bridges for retrofit funding, especially in the first 72 hours after the disaster. This methodology has also provided the possibility of evaluating budget allocation options. The results are presented for the Sioux Falls model, and the efficiency of the proposed model has been shown.

Highlights

A high-intensity earthquake in a large and densely populated city can cause a massive humanitarian disaster
Each bridge can be used or not (1 or 0), giving the network a total of 32 states (25). Each of these states has a chance of occurring depending on the survival/failure probabilities of the bridges without retrofitting. e occurrence probability of each potential condition is computed by multiplying the survival probability of usable bridges by
emergency road network (ERN) problem-solving is not a one-shot prospect; the results of this study reveal that inventive retrofitting solutions exist, regardless of the budget allocation limitations. e retrofitting solutions that resulted from our model demonstrate that even with tight budgets, an ERN could be adequately retrofitted

Summary

Introduction

A high-intensity earthquake in a large and densely populated city can cause a massive humanitarian disaster. In such cases, even less severe earthquakes may lead to extensive damages [1]. Lack of proper access to disaster relief centres in the city (spatially and temporally) is one of the most important causes of human disasters is lack of access can be seen when damage to all or a section of the road network makes efficient use of the remaining network impossible [2,3,4]. Since the entire network of urban streets cannot be managed after the earthquake, it is necessary to implement this, at least along the streets (which creates the greatest amount of coverage between important population points and rescue centres in the city). Considering the importance of controlling and managing the emergency road network (ERN) in times of disaster, these passages must be protected from damage and can be used at any time

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Results

Conclusion