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International Journal of Critical Infrastructures (6 papers in press)
Study on Seismic Performance of Long-Span Railway Continuous Girder Bridges in High Seismic Intensity Region by Jianning Li, Lusong Yu, Ziqi Li, Wei Lu Abstract: Taking a long-span railway continuous girder bridge in a high seismic intensity region as the research subject, use finite element software to establish calculation model, Input artificial seismic wave for nonlinear seismic response analysis. The results show that the bottom of fixed pier and piers on both sides have entered elastoplastic working state, and seismic resistance capability of the fixed pier is insufficient, the displacement of main girder exceeds 20cm, which will lead to a risk of girder falling. In order to reduce the seismic response of structure, Use liquid viscous damper for seismic design, After damping processing, the displacement of the main girder is effectively controlled, seismic load of the fixed pier is reduced ,and seismic capacity of each pier is well played, The earthquake load of piers on two sides with fixed bearing of the adjacent-span simply supported girder bridge has a certain degree of reduction. Keywords: High Seismic Intensity Region; Long-Span Continuous Girder Bridge; Nonlinear Analysis; Liquid Viscous Damper; Sensitivity Analysis; Damping Effect. DOI: 10.1504/IJCIS.2020.10027823
Failure Probability Analysis of Heliostat Systems by Kong Fah Tee, Samir Benammar Abstract: Failure probability analysis of heliostat systems has been provided in order to evaluate the risk on their design over their life cycle. Based on mechanics of material study and wind aerodynamic analysis, a performance function, with five random variables, has been developed wherein the random variables are: wind speed, inside and outside pedestal diameters, pedestal yield stress and mirror mass. To analyze the failure probability of this performance function, four main methods have been proposed: First Order Reliability Method (FORM), Second Order Reliability Method (SORM), Monte Carlo Method (MC) and Subset Simulation Method (SS) The variation of failure probability with the variation of pedestal wall thickness and wind speed, for different outside diameters, has been simulated. Keywords: failure analysis; heliostat; probability of failure; subset simulation; wind load. DOI: 10.1504/IJCIS.2020.10030105
Multi-level approach to assessing the resilience of Road Network Infrastructure by Fabio Borghetti, Boris Petrenj, Paolo Trucco, Veronica Calabrese, Marco Ponti, Giovanna Marchionni Abstract: A two-step method to assess the resilience of road network infrastructures is developed to support resilience capacity building. The first step exploits the DMCI (dynamic functional modelling of vulnerability and interdependency of critical infrastructure) modelling approach for transportation network characterisation. DMCI reveals the cascading effects under disruption (due to interdependencies), and ranks the road sections according to their criticality (vital node analysis VNA). The second step uses a quantitative coping capacity index (CCI) to assess in more detail the capacity of operators and first responders to cope with an incidental event coordinating all available resources, in order to respond and rapidly recover service operations managing all the relevant interdependencies. The combination of the two levels of analysis offers more comprehensive insights on a transportation network resilience and its intended use is to guide resilience planning within capacity building programs, at both intra- and inter-organisational levels. Keywords: critical infrastructure; transportation infrastructure; resilience; emergency management; response and recovery; simulation.
A predictor analysis framework for surface radiation budget reprocessing using satellite data by Resit Unal, Patricia A. Quigley, Paul W. Stackhouse, Stephen J. Cox Abstract: Equipped with various types of imagers, lasers and radars, dozens of satellites orbit the earth every day collecting and relaying data for weather and atmospheric analysis, communication and navigation applications and planetary studies. NASA?s Global Energy and Water Cycle (GEWEX) Surface Radiation Budget (SRB) shortwave algorithm derives long-term datasets from satellite data for distribution of the sun?s energy to the surface and back to space. This paper presents an analysis framework to describe propagation of input parameter variability to output data results in algorithmic computations, and then quantify the variability in the solution sets. The SRB shortwave algorithm and design of experiments methods are utilized to determine significant input parameters and interactions. A sensitivity analysis is also conducted to determine the variability in the output data for each dependent variable varying within their range using Monte Carlo simulation. Keywords: Surface radiation budget; variability; determinant optimal designs; satellite; quadratic model. DOI: 10.1504/IJCIS.2021.10031156
PRACTICAL RISK ASSESSMENT TOOL FOR CHEMICALS AT THE GULF OF MEXICO PORTS by Berna Eren Tokgoz, Jianyuan Ni, Fei Gao, Yueqing Li Abstract: Abstract: Seaports have to process and maintain numerous dangerous chemicals every day because of the increase in maritime transportation of these chemicals. Since the location of seaports are in close proximity to the cities, they pose a serious threat to the public as well as their immediate environment. However, public and environmental risk of dangerous chemicals are different. To rank risk scores of chemicals for public health, three types of effects has been evaluated. They are acute, chronic and sub-chronic effects. On the other hand, to rank risk scores of chemicals for environment, hazard scores for bioaccumulation, aquatic toxicity and chronic aquatic toxicity have been calculated. More than six-hundreds of frequently transported chemicals were prioritized for the fourteen ports at the Gulf of Mexico (GM). Ports were selected based on their annual cargo volume in 2016. The top eleven substances were presented according to their public and environment risk scores. Keywords: Gulf of Mexico; risk assessment; Java software tool; port management. DOI: 10.1504/IJCIS.2020.10031174
Dynamics of Interdependent Critical Infrastructures - a prioritized distribution model by Peter Klein Abstract: Previous research articles about interdependent critical infrastructures developed different mathematical models describing the dynamic direct and indirect interactions of these infrastructures. Many of these models use discrete time steps to show how a reduced operability of one infrastructure C at time t will lead at time t+1 to reductions in all infrastructures to which C distributes its output; and many of them use a standard mode of distribution called proportional. According to a recent result, with this proportional distribution a reduced operability in only one infrastructure will lead to an enduring reduction of all operabilities even after full repairs of all damages. This research replaces this proportional mode by a newly defined prioritized one. It shows that a system with prioritized distribution mode leads in nearly all practical cases to an increased behaviour of the whole system: After repair of all damages all infrastructures will return automatically to full operability. Keywords: Critical Infrastructure; CI; disruption; proportional/prioritized distribution; opera-bility; intrinsic capacity; perturbation.