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Current Projects and Sponsors

The Structural and Infrastructural System Reliability and Risk Assessment (SISRRA) research group focuses on computational and theoretical developments to evaluate the failure probability and quantify the consequences of failure of complex engineered systems. 

If you have any questions or comments regarding the SISRRA research group, please feel free to contact us

Project Index

Interdependent Response of Complex Urban Infrastructures Subjected to Multiple Hazards - NSF Award: #0728040 

Inderdependent Networks Subproject No.1: Computational and empirical modeling of lifeline systems interdependence propagation 

This research focuses on Probabilistic Fragility Assessment (PFA) of interdependent Spatially Distributed Lifelines (SDL). 
This topic offers three principal challenges that are under investigation. First, the deterministic performance of spatially distributed lifelines can...read more 

CAREER: Reliability Assessment and Risk Mitigation Principles for Smart Interdependent Infrastructure Systems-NSF Award: #0748231

transmission1 Subproject No.1: Topological bounds and hierarchical clustering for network reliability assessment  
Infrastructure systems such as power transmission grids constitute the backbone of modern societies. Large infrastructure systems are complex networks, and therefore their response to component failure cannot be studied by only focusing on individual components, but on their interconnection patters as well. Any disruptions to the functionality of components in infrastructure...read more 
ReliabilityIcon Subproject No.2: Reliability and topology based design of infrastructure interfaces 

This project focuses on the reliability-based design of infrastructure systems considering both network topological features and network interdependence. Positive and negative effects of interconnectedness are studied for a broader exploration of infrastructure coupling. Modern inverse reliability tools are...read more 
trans5 Subproject No.3: Smart grid resilience 
Smart grid uses a unique, digital platform for fast and reliable sensing, measurement, communication, computation, control, protection, visualization, and maintenance of the entire transmission & distribution systems. It is expected to not only prevent the disruptive events, but also maintain a high functionality level following disruptions. This property is termed resilience. This...read more 



IT-Enabled Continuous Risk Assessment of Bridge Networks for Customized and Actionable Multi-Hazard Interventions - NSF Award: #0928493

sc2 Subproject No.1: Computational and analytical Bridge and bridge network reliability assessment  
Bridge infrastructure owners are challenged to effectively manage risks not only from aging and deterioration but also from natural hazards, such as earthquakes or storm surge. These difficulties are stimulating an emerging trend of instrumentation and condition assessment of bridges. This project will...read more 
Soil Liquifaction Icon
Subproject No.2: Soil-foundation-structure interaction modeling for probabilistic analysis of bridges 
The increased failure potential of aging U.S. highway bridges, and their susceptibility to damage during extreme events, necessitates the development of efficient reliability assessment tools to prioritize maintenance and rehabilitation interventions. Reliability communication tools become...read more 


Prioritizing and Selecting Bridge Management Actions for heightened Truck Loads and Natural Hazards in Light of Funding Allocation Patterns - NSF Award: #1234690

Subproject No.1: Evaluating the accumulated error in seismic reliability and risk analysis of aging highway bridge networks  

The development of surrogate models at bridge and network level has significantly enhanced the computational efficiency of reliability and risk assessment of highway bridge networks. This research aims at identifying and quantifying the uncertainties associated with risk analysis at various steps involved in order to provide realistic bounds on the provided reliability and risk estimates.

Other associated researchers: Jamie Padgett, Leonardo Duenas, Jay Ghosh



Hurricane risk assessment and evacuation behavior

Storm Risk Icon Subproject No.1: Joint risk assessment from hurricane-induced flood, surge, wind, and power outage hazards

This project will develop an online tool that City of Houston citizens can use to determine the magnitude of the risks they could face when exposed to hurricane events.  The “Storm Risk Calculator” provides estimates at the neighborhood level of the consequences of being exposed to wind, flood, surge, as well as the likelihood of power outages.  Citizens empowered with...read more

Closed-form methods for system reliability assessment of power distribution systems

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Subproject No.1: Theoretical description of radial power distribution system reliability

The increased susceptibility of lifeline systems to failure due to aging and external hazards requires efficient methods to quantify their reliability and related uncertainty. Monte Carlo simulation techniques for network-level reliability and uncertainty assessment usually require large computational experiments. Also, available analytical approaches apply mainly to...read more 

Wind turbine unavailability assessment

Wind Icon Subproject No. 1: Long-term unavailability of wind turbines from wind-induced accelerations

The increased susceptibility of lifeline systems to failure due to aging and external hazards requires efficient methods to quantify their reliability and related uncertainty. Monte Carlo simulation techniques for network-level reliability and uncertainty assessment...read more


 Subproject No. 2: Wind turbine reliability survey

Reliability analyses currently undertaken are based on extracts from databases of wind turbine failures collected largely in Europe. Available information is found already processed and presented in table and graph formats, preventing independent statistical and reliability analyses from...read more