The Effects of Deteriorating Bridges on Bridges on the Bridge Network Connectivity

Rokneddin, Keivan; Ghosh, Jayadipta; Padgett, Jamie E.; Osorio, Leonardo Duenas

doi:10.1061/41171(401)260

Cited by 3 publications

(2 citation statements)

References 24 publications

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“…Engineering methods based on the wait-and-see approach [15] seek optimal solutions upon the realizations of uncertainty (in the form of scenarios), that is, the engineering methods focus on the deterministic optimization problems. The resulting scenario dependent solutions are then aggregated in order to be implemented [3,16,17,18,19]. However, since future events are unknown at the time of making decisions, scenario-specific solutions (policies) may not even be feasible for other possible scenarios.…”

Section: Relevant Literaturementioning

confidence: 99%

A mean-risk mixed integer nonlinear program for transportation network protection

Gupte

Huang

2018

European Journal of Operational Research

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This paper focuses on transportation network protection to hedge against extreme events such as earthquakes. Traditional two-stage stochastic programming has been widely adopted to obtain solutions under a risk-neutral preference through the use of expectations in the recourse function. In reality, decision makers hold different risk preferences. We develop a mean-risk two-stage stochastic programming model that allows for greater flexibility in handling risk preferences when allocating limited resources. In particular, the first stage minimizes the retrofitting cost by making strategic retrofit decisions whereas the second stage minimizes the travel cost. The conditional value-at-risk (CVaR) is included as the risk measure for the total system cost. The two-stage model is equivalent to a nonconvex mixed integer nonlinear program (MINLP). To solve this model using the Generalized Benders Decomposition (GBD) method, we derive a convex reformulation of the second-stage problem to overcome algorithmic challenges embedded in the non-convexity, nonlinearity, and non-separability of first-and second-stage variables. The model is used for developing retrofit strategies for networked highway bridges, which is one of the research areas that can significantly benefit from mean-risk models. We first justify the model using a hypothetical nine-node network. Then we evaluate our decomposition algorithm by applying the model to the Sioux Falls network, which is a large-scale benchmark network in the transportation research community. The effects of the chosen risk measure and critical parameters on optimal solutions are empirically explored.

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Section: Relevant Literaturementioning

confidence: 99%

A mean-risk mixed integer nonlinear program for transportation network protection

Gupte

Huang

2018

European Journal of Operational Research

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“…In seismic regions, post-earthquake functionality of bridges plays a crucial role in expediting rescue services and mitigating casualties. Malfunction of bridges will interrupt the whole transport network, and create enormous economic losses after seismic events ( [2], [3]). With growing urban population and rapid development of economics, reliable seismic design of bridges becomes even more important.…”

Section: Introductionmentioning

confidence: 99%

Layered composite entangled wire materials blocks as pre-tensioned vertebral rocking columns

Kashani

Ahmadi

Gonzalez-Buelga³

et al. 2019

Composite Structures

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This work focuses on entangled wire materials as an option for use between segments of a novel self-centring bridge pier inspired from the human spine mechanism to increase energy dissipation capability of the pier in rocking. A comprehensive set of free-decay vibration tests was conducted on small-scale columns with and without entangled wire materials. Wooden blocks are used as vertebrae with entangled wire materials as intervertebral disks. The whole system is tied together using a pre-tensioned tendon. Dynamic properties of columns (i.e. frequency and damping ratio) were then identified and compared. It is found that the use of entangled wire materials significantly increases the energy dissipation capacity of the system during rocking. This finding is very encouraging for future use of entangled wire materials composite systems in large-scale testing of the proposed rocking column, while their shear and axial stiffness needs be improved to reduce large shear and axial deformations.

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Assessment of Postearthquake Losses in a Network of Aging Bridges

Alipour

Shafei

2016

J. Infrastruct. Syst.

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The Effects of Deteriorating Bridges on Bridges on the Bridge Network Connectivity

Cited by 3 publications

References 24 publications

A mean-risk mixed integer nonlinear program for transportation network protection

A mean-risk mixed integer nonlinear program for transportation network protection

Layered composite entangled wire materials blocks as pre-tensioned vertebral rocking columns

Assessment of Postearthquake Losses in a Network of Aging Bridges

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